With Measuring, Testing, Signalling Or Inspection Means Patents (Class 416/61)
  • Publication number: 20140030092
    Abstract: A method and system for establishing sets of blade frequency values for each rotating blade of a rotor assembly at two or more different points in time and determining an indication of blade health from the change in the blade frequency values is provided. Blade frequency values are determined by receiving measurements of vibratory responses from blade monitoring equipment (20) and processing via a processing device (30) vibration data as a system of rotating blades to extract a frequency of each blade. Sets of blade frequency values are compared to determine a change in the blade frequency values for each rotating blade to provide the indication of blade health.
    Type: Application
    Filed: July 24, 2013
    Publication date: January 30, 2014
    Inventors: Roger W. Heinig, Jerry H. Griffin, Drew M. Feiner
  • Patent number: 8636468
    Abstract: An arrangement with a nacelle and an instrument bar is provided. The instrument bar is arranged on top of the nacelle. A rotational axis interacts with the nacelle and with the instrument bar. The rotational axis is constructed and arranged such that the instrument bar is allowed to pivot between a first position and a second position in reference to the top side of the nacelle. The instrument bar projects above the top side of the nacelle when locked in the first position, while the instruments are operated. The instrument bar is locked close to the top side of the nacelle in the second position to allow access to the instruments.
    Type: Grant
    Filed: November 8, 2010
    Date of Patent: January 28, 2014
    Assignee: Siemens Aktiengesellschaft
    Inventor: Thorkil Munk-Hansen
  • Patent number: 8636462
    Abstract: A system for detecting defects in a turbine rotor blade of a combustion turbine engine. The system may include: a turbine rotor blade that includes an insulator coating; a first electrode that is electrically connected to the turbine rotor blade; a second electrode that resides in proximity to the turbine rotor blade; means for inducing a voltage across the first electrode and the second electrode; and means for detecting current flowing between the first electrode and the second electrode.
    Type: Grant
    Filed: January 10, 2011
    Date of Patent: January 28, 2014
    Assignee: General Electric Company
    Inventors: Gilbert Otto Kraemer, Dullal Ghosh, Bhaskara Rao Atchuta
  • Publication number: 20140023498
    Abstract: Systems and methods are provided for real-time detection of the onset of stall in turbomachinery, such as compressor stall. The methods are capable of detecting and analyzing time of arrival of the chord of the blade at a sensor array to provide an indication of the onset of compressor stall. Systems for detecting the onset of compressor stall include: light sources; a plurality of linearly arranged optical fibers for transmitting light from the light sources and for receiving transmitted light reflected from a blade; a detector for measuring intensity of the reflected light; and a processor for analyzing the intensity of the reflected light to determine blade twist angle and from the blade twist angle identify onset of compressor stall. The invention can prevent the needless loss of life and assets caused by compressor stall that may lead to unexpected catastrophic failure of an engine.
    Type: Application
    Filed: July 8, 2013
    Publication date: January 23, 2014
    Inventor: Daniel Kominsky
  • Publication number: 20140017081
    Abstract: A method is provided for controlling the pitch systems of a plurality of pitch systems of a wind turbine. The method includes generating a main pitch control signal for the pitch systems on the basis of a performance parameter of the wind turbine and generating a distinct auxiliary pitch control signal for each individual pitch system of the plurality of pitch systems. The method further includes adding an auxiliary pitch control signal to the main pitch control signal to give a combined pitch control signal for a pitch system. The method then includes controlling that pitch system in response to that combined pitch control signal wherein an auxiliary pitch control signal is suppressed when a pitch activity value and/or a pitch variation value is below a predefined threshold.
    Type: Application
    Filed: August 17, 2011
    Publication date: January 16, 2014
    Applicant: SIEMENS AKTIENGESELLSCHAFT
    Inventors: Thomas Esbensen, Gustav Hoegh
  • Patent number: 8622699
    Abstract: A device adapted to be fitted with propeller blades includes a first retention ring including over a periphery thereof a plurality of radial bores; and a second retention ring including over a periphery thereof a plurality of radial bores, the first and second retention rings being mounted one on top of the other in the radial direction, each bore in the first retention ring being positioned opposite a bore in the second retention ring, a bore in the first retention ring arranged opposite a bore in the second retention ring forming a bore pair adapted to receive a foot of a blade.
    Type: Grant
    Filed: October 14, 2010
    Date of Patent: January 7, 2014
    Assignee: SNECMA
    Inventors: François Gallet, Patrick Morel, Wouter Balk
  • Publication number: 20140003938
    Abstract: A stall sensor for a wind turbine is provided. A wind turbine including such a stall sensor and a method of operating such a wind turbine are also provided. The stall sensor includes detector means adapted to measure vibration of a rotor blade of the wind turbine and to output a vibration signal representative of the vibration of the rotor blade, conversion means connected to the detector means and adapted to determine a noise figure representative of a spectral signal content within a frequency band of the vibration signal received from the detector means and arbiter means connected to the conversion means and adapted to signal a presence or an absence of stall based on the noise figure received from the conversion means.
    Type: Application
    Filed: June 14, 2013
    Publication date: January 2, 2014
    Inventors: Thomas Esbensen, Gustav Hoegh
  • Publication number: 20140003942
    Abstract: A sensor device for measuring aerodynamic loads of a rotor blade for a wind power installation . The sensor device includes a reflector arranged in a cavity of the rotor blade which signals a signal evaluation device arranged at a distance from the reflector. The signal evaluation device detects and quantifies physical changes of the rotor blade from the reflected signal. A cleaning device for the reflector is arranged on the reflector for activation by a centrifugal force generated during the rotation of the rotor to clean the reflector.
    Type: Application
    Filed: February 22, 2012
    Publication date: January 2, 2014
    Applicant: SSB WIND SYSTEMS GMBH & CO. KG
    Inventors: Fabio Bertolotti, Norbert Kötting
  • Publication number: 20130336786
    Abstract: A system and method for automatically inspecting a lightning protection system on a wind turbine is disclosed. The system and method may include a wind turbine having a plurality of blades mounted to a hub, a lightning receptor on each of the plurality of blades, a lightning protection system extending from each of the lightning receptor to an earth grounding grid and a conductor that is part of a testing system extending from at least inside the hub, through the inside of at least one of the plurality of blades and connecting to the lightning receptor, the conductor completing a circuit extending from the lightning receptor to the earth grounding grid. A test current signal may be introduced into the testing system for a leg of the lightning protection system to be tested and an electrical continuity in the circuit using the test current signal may be determined.
    Type: Application
    Filed: June 18, 2012
    Publication date: December 19, 2013
    Applicant: Clipper Windpower, LLC
    Inventor: Joshua Paul Kissinger
  • Patent number: 8608439
    Abstract: A system for arranging and operating an array of wind machines to protect crops from damaging weather conditions, such as freezing frost, rain and heat. The method includes a wind machine positioned to force air across the crop. The wind machine is preferably a propeller/tower configuration. The operational method of the wind machine array includes the steps of sensing ambient meteorological and the hardiness of the crop to withstand a particular adverse weather condition and operating the wind machines in response to these factors. Multiples of wind machines are employed in the preferred embodiment of the method, the siting of the wind machines preferably based upon topographic and historical meteorological conditions. The operation of the wind machines can be automatically and remotely operated with the aid of satellite communications including internet links.
    Type: Grant
    Filed: December 27, 2011
    Date of Patent: December 17, 2013
    Inventor: Daryl G. Hill
  • Patent number: 8608441
    Abstract: The lengths and/or chords and/or pitches of wind turbine or propeller blades are individually established, so that a first blade can have a length/chord/pitch that is different at a given time to the length/chord/pitch of a second blade to optimize performance and/or to equalize stresses on the system.
    Type: Grant
    Filed: June 12, 2006
    Date of Patent: December 17, 2013
    Assignee: Energyield LLC
    Inventor: Robert Hotto
  • Publication number: 20130330188
    Abstract: A horizontal axis wind turbine with a ball-and-socket hub is disclosed. The hub enables horizontal axis turbines with two or more blades to teeter in response to wind shear gradients. The new hub design for a turbine equipped with three blades has been modeled using modified FAST code and has shown significant advantages over present three-bladed turbines with fixed hubs in reducing loads on the blades, tower, main shaft and bearings. The new hub design for a turbine equipped with three blades has also shown significant advantages over present two-bladed teetering turbines in reducing loads on the blades and tower. A likely additional advantage of a ball-and-socket hub equipped with three blades over a teetering hub with two blades is that wider teetering ranges are possible due to the significantly reduced likelihood for resonant teetering.
    Type: Application
    Filed: July 15, 2013
    Publication date: December 12, 2013
    Inventor: Arnold Ramsland
  • Publication number: 20130330189
    Abstract: A ceramic matrix composite blade for use in a gas turbine engine having an airfoil with leading and trailing edges and pressure and suction side surfaces, a blade shank secured to the lower end of each airfoil, one or more interior fluid cavities within the airfoil having inlet flow passages at the lower end which are in fluid communication with the blade shank, one or more passageways in the blade shank corresponding to each one of the interior fluid cavities and a fluid pump (or compressor) that provides pressurized fluid (nominally cool, dry air) to each one of the interior fluid cavities in each airfoil. The fluid (e.g., air) is sufficient in pressure and volume to maintain a minimum fluid flow to each of the interior fluid cavities in the event of a breach due to foreign object damage.
    Type: Application
    Filed: April 5, 2012
    Publication date: December 12, 2013
    Inventors: Andres Jose Garcia-Crespo, Jerome Walter Goike
  • Patent number: 8602731
    Abstract: A rotor blade is used in combination with a submersible electrical generator for generating electricity to be put into the grid, where the pitch of the rotor blade is controlled by a microprocessor. The microprocessor controls a radio frequency transmitter which emits signals to a receiver which controls a hydraulic value. The hydraulic valve controls a push-pull arrangement which through a right angle gear and pitch adjustment axial adjust the rotor pitch according to pre-programmed conditions stored in the microprocessor.
    Type: Grant
    Filed: January 11, 2012
    Date of Patent: December 10, 2013
    Inventor: Fred K. Carr
  • Publication number: 20130323057
    Abstract: An apparatus is described for measuring the deposition of ice on the rotor blades (5) of a wind turbine (1), having a transmitting and receiving device with parts that are on the rotor blades (5) on the one hand and parts that are arranged in fixed positions and are connected to each other via a wireless transmission link on the other and having an evaluation circuit (9) connected to the transmitting and receiving device. In order to provide advantageous structural conditions, it is proposed that the transmitting and receiving device comprises passive transponders (6) on the rotor blades (5) and at least one stationary reader unit (7) for the transponders (6) and the evaluation circuit (9) has a comparator stage (10) for the minimum transmission output of the reader unit (7) required to read the transponders (6) reliably, with a programmable threshold value for this transmission output in the event of the deposition of ice.
    Type: Application
    Filed: June 4, 2013
    Publication date: December 5, 2013
    Inventors: Thomas BUCHEGGER, Clemens HESCH
  • Patent number: 8591188
    Abstract: A clearance sensing system for a rotating machine includes a plurality of sensor probes disposed within a stationary shroud of the rotating machine. Each of the plurality of sensor probes is adapted to measure a parameter indicative of an axial and a radial displacement of a rotating component within the shroud and to produce a signal that corresponds to the parameter. In certain embodiments, this parameter may include a capacitance between the rotating component and the sensor probe. The clearance sensing system further includes a circuit that receives the signal from each of the plurality of sensor probes and determines (a) the axial displacement of the rotating component within the shroud and (b) a radial displacement of the rotating component relative to the shroud.
    Type: Grant
    Filed: April 26, 2005
    Date of Patent: November 26, 2013
    Assignee: General Electric Company
    Inventors: Minesh Ashok Shah, Mahadevan Balasubramaniam, Philip Paul Beauchamp, Todd Alan Anderson, Samhita Dasgupta, David Mulford Shaddock, Emad Andarawis Andarawis
  • Patent number: 8591187
    Abstract: In one aspect, a system for detecting loads transmitted through a blade root of a rotor blade of a wind turbine is disclosed. The system may include a root attachment assembly configured to couple the blade root to a hub of the wind turbine. The root attachment assembly may include a barrel nut mounted within a portion of the blade root and a root bolt extending from the barrel nut. In addition, the system may include a sensor associated with the root attachment assembly. The sensor may be configured to detect loads transmitted through at least one of the barrel nut and the root bolt.
    Type: Grant
    Filed: December 6, 2011
    Date of Patent: November 26, 2013
    Assignee: General Electric Company
    Inventors: Bharat Bagepalli, Nilesh Tralshawala, Aditi Koppikar, Sascha Schieke, Pekka Sipilae
  • Patent number: 8577509
    Abstract: A method and a system for controlling operation of a wind turbine are provided. The method includes determining at least one failure mode relating to one or more components of the wind turbine, estimating a remaining lifetime of the component under current operating conditions, determining one or more control schemes to control the operation of the wind turbine in order to adjust the remaining lifetime of the component to a desired remaining lifetime of the component, determining a power production yield for the determined one or more control schemes and selecting a determined control scheme for controlling the operation of the wind turbine that maximizes the power production yield.
    Type: Grant
    Filed: June 22, 2010
    Date of Patent: November 5, 2013
    Assignee: Vestas Wind Systems A/S
    Inventors: Jiun Keat Ong, Tie Ling Zhang, Yu Zhou, Khoon Peng Lim, Wan Ying Chen, Pey Yen Siew, Kiran Kishan Rao Nandedkar, Jiann Yi Ho, Bung Chai Chin
  • Publication number: 20130287567
    Abstract: A system for identifying the likelihood of a wind turbine rotor blade striking a wind turbine tower comprises a device for sensing bending of a wind turbine rotor blade and a device for sensing bending of a wind turbine tower. In a preferred embodiment Long Period Grating (LPG) sensors are used to measure bending of the tower. Preferably a plurality of LPG sensors is provided along the length of the blade. In one embodiment at least one of the LPG sensors comprises two sensing elements arranged to sense in perpendicular directions. In another embodiment a plurality of LPG sensors are provided each on different sides of the wind turbine tower. A processor uses the sensed blade and tower bending to determine whether the distance between the blade and the tower will be below a predetermined minimum value.
    Type: Application
    Filed: October 31, 2011
    Publication date: October 31, 2013
    Applicant: VESTAS WIND SYSTEMS A/S
    Inventors: Ib Svend Olesen, Lars Glavind
  • Patent number: 8568087
    Abstract: The present technology relates generally to a device for the detection of a shaft fracture in a rotor of a turbine, for example a medium pressure turbine such as a gas turbine, in particular an aircraft engine, whereby at least one stator-side sensor element is positioned downstream from the turbine in the area of a stator-side guide vane ring of another turbine in particular, a low pressure turbine; and whereby a radially inner section of the last rotor-side moving blade ring (as seen in the direction of flow) of the turbine cooperates with at least one sensor element directly and/or proximally in the event of a shaft fracture in the rotor of the turbine to generate an electric signal corresponding to the shaft fracture.
    Type: Grant
    Filed: October 9, 2008
    Date of Patent: October 29, 2013
    Assignee: MTU Aero Engines GmbH
    Inventors: Alastair McIntosh, Christopher Bilson
  • Publication number: 20130280070
    Abstract: A wind turbine blade extending along a longitudinal axis from a root end to a tip end and in a transverse plane perpendicular to the longitudinal axis, the transverse plane having a main axis extending through an elastic center point, wherein the wind turbine blade comprises a sensor system including a first sensor set for measuring a first bending moment in a first sensor position at a first distance from the root end, the first sensor set comprising a first primary sensor for measuring a primary component and a first secondary sensor for measuring a secondary component, wherein a first primary sensor axis in the transverse plane is oriented in a direction defined by the first primary sensor and the elastic center point, and a first secondary sensor axis in the transverse plane is oriented in a direction defined by the first secondary sensor and the elastic center point, and wherein an angle between the first primary sensor axis and the first secondary sensor axis is in the range from 50° to 130°
    Type: Application
    Filed: December 19, 2011
    Publication date: October 24, 2013
    Applicant: LM WP PATENT HOLDING A/S
    Inventors: Torben Lindby, Ivan Engmark Mortensen
  • Publication number: 20130276832
    Abstract: A method for cleaning deposits from a wave energy converter includes driving at least one rotatably mounted component that is coupled to an energy converter. The energy converter is configured to convert energy from wave motion of a fluid into a different form of energy. A negative energy balance of the wave energy converter is present during the cleaning over an average period of time.
    Type: Application
    Filed: April 18, 2013
    Publication date: October 24, 2013
    Applicant: Robert Bosch GmbH
    Inventors: Lasse Langner, Nik Scharmann, Leonore Glanz, Juergen Hackenberg, Benjamin Hagemann, Patrick Singer
  • Publication number: 20130272878
    Abstract: A system, a device and a method for controlling an operation of a wind turbine (100) based on a wind turbine component workload. The system includes a control device (120) that is configured to actuate a wind turbine component (130). The system also includes a wind turbine controller (205) that is coupled in communication with the control device (120) and configured to determine a workload associated with the wind turbine component (130) based at least in part on one or more actuations of the wind turbine component (130) by the control device (120) within a time period. The wind turbine controller (205) is also configured to calculate an operating threshold value based at least in part on the calculated workload and to operate the wind turbine component (130) by the control device (120) based on the calculated operating threshold value.
    Type: Application
    Filed: December 30, 2010
    Publication date: October 17, 2013
    Inventor: Wei Zhu
  • Publication number: 20130272874
    Abstract: A method for determining a bending angle of a rotor blade of a wind turbine system includes step of reading in an acceleration signal which represents an acceleration of the rotor blade acting essentially perpendicularly with respect to a rotor plane. In addition, the method includes a step of determining the bending angle of the rotor blade of the wind turbine using the acceleration signal.
    Type: Application
    Filed: July 2, 2011
    Publication date: October 17, 2013
    Inventors: Felix Hess, Martin Voss, Boris Buchtala, Christian Eitner
  • Patent number: 8550788
    Abstract: An impeller device may include a magnetic detecting element and a magnetic body, which is paired with the magnetic detecting element, for detecting a rotational position of a rotary impeller. The rotary impeller is formed with a bottomed recessed part having an opening into which one of the magnetic detecting element or the magnetic body is inserted, and the opening of the recessed part is sealed with resin injected by insert molding so that the one of the magnetic detecting element and the magnetic body is buried in the rotary impeller. The magnetic detecting element and the magnetic body are capable of facing to each other through a bottom face of the bottomed recessed part.
    Type: Grant
    Filed: February 24, 2010
    Date of Patent: October 8, 2013
    Assignee: Nidec Sankyo Corporation
    Inventors: Shota Oda, Tetsuhiko Hara, Hideaki Ito
  • Publication number: 20130259686
    Abstract: A method includes obtaining at least one operational parameter value and at least one environmental parameter value associated with a wind turbine, predicting a future speed of the wind turbine based upon the at least one operational parameter value and the at least one environmental parameter value, determining whether the predicted future speed of the wind turbine exceeds a threshold speed, and if the predicted future speed of the wind turbine exceeds the threshold speed, controlling the wind turbine so that an actual future speed of the wind turbine does not exceed the threshold speed.
    Type: Application
    Filed: March 30, 2012
    Publication date: October 3, 2013
    Applicant: GENERAL ELECTRIC COMPANY
    Inventors: Rogier Sebastiaan Blom, Matthijs Leonardus Gerardus Boerlage
  • Patent number: 8547558
    Abstract: A wind power rotor with measuring device (3) for measuring rotor deflection. A measuring cavity (20), which has a transmitter/receiver (31/32) at one end and a reflector device (33) at the other end, extends in a longitudinal direction of the rotor. The transmitter/receiver (31/32) is accommodated in a housing (50), which is fastened to an intermediate plate (10) with three-point mounting (12, 13, 14).
    Type: Grant
    Filed: November 15, 2011
    Date of Patent: October 1, 2013
    Assignee: Baumer Innotec AG
    Inventors: Michael Weigel, Joachim Tiedeke
  • Patent number: 8545179
    Abstract: A system for the structural monitoring of blades 1 on a wind turbine. Each blade 1 has respective optical fiber bragg grating sensors 5. The system has a number of input connectors, which connect to the strain sensors 5 of respective blades 1. A single output connector connects to a data processing device 3 which processes signals from the strain sensors 5. The input connectors each have a signal path to the output connector that is different in length to the signal path from the other input connectors, such that signals from a given blade 1 can be identified at the data processing device 3 by the time of arrival of the signals. The system has the advantage that the each of the blades 1, including the sensors attached to it or embedded within it can be identical and therefore interchangeable.
    Type: Grant
    Filed: August 20, 2007
    Date of Patent: October 1, 2013
    Assignee: Moog Insensys Limited
    Inventors: Mark Volanthen, Philip Mark Rhead, Martin Peter William Jones, Glynn David Lloyd
  • Publication number: 20130243590
    Abstract: Systems and methods for determining thrust on a wind turbine are disclosed. In one aspect, a system is described that can be comprised of a wind turbine comprising a rotor, wherein one or more rotor blades of the wind turbine are affixed to the rotor; and one or more sensors located on or within the rotor, wherein the one or more sensors measure deflection of the rotor. In one aspect, the measured deflection is correlated with thrust on the wind turbine and the measured thrust can be used to determine at least in part a pitch angle for at least one of the one or more rotor blades during peak shaving.
    Type: Application
    Filed: March 15, 2012
    Publication date: September 19, 2013
    Inventor: Thomas Edenfeld
  • Publication number: 20130243594
    Abstract: Method and blade monitoring system for monitoring bending moment of a wind turbine blade. The method comprises obtaining a first sensor set signal indicative of a first bending moment at a first sensor position different from the tip end along the longitudinal axis of the wind turbine blade, and estimating a bending moment at a first estimation position along the longitudinal axis based on the first sensor set signal, wherein the first sensor position is different from the first estimation position along the longitudinal axis. The blade monitoring system comprises a processing unit and an interface connected to the processing unit, the processing unit being configured for performing the method.
    Type: Application
    Filed: December 19, 2011
    Publication date: September 19, 2013
    Applicant: LM WP Patent Holdings A/S
    Inventor: Casper Skovby
  • Publication number: 20130236306
    Abstract: A wind power generating system in which a plurality of stationary modules form a toroidal shaped tower that accelerates wind passing around and between the modules due to the Bernoulli Effect. Between the modules are located a plurality of vertical axis wind turbine rotors with an integrated generator system that in combination forms an integrated rotor and generator assembly connected to a rotatable yaw platform via an improved support arm. The rotor and generator assemblies act independently of each other to accommodate different wind conditions at different altitudes and to provide partial production to significantly enhance overall wind production.
    Type: Application
    Filed: March 9, 2012
    Publication date: September 12, 2013
    Inventor: Kenneth D. Cory
  • Patent number: 8523520
    Abstract: A wind turbine generator generates power through rotation of a rotor to which a plurality of blades are pivotally coupled and includes a pitch-angle control section that outputs a pitch-angle command value that indicates the amount of change in the pitch angle of each of the blades, hydraulic cylinders each of which changes the pitch angle of the corresponding blade based on the corresponding pitch-angle command value output from the pitch-angle control section, and load measurement sections that measure blade-root loads. A set value indicating that wind received by the wind turbine generator has a biased wind speed distribution is set in advance in the pitch-angle control section. Only when a calculated pitch-angle command value exceeds the set value, the pitch-angle control section outputs a pitch-angle command value beyond pitch command limit values.
    Type: Grant
    Filed: May 27, 2011
    Date of Patent: September 3, 2013
    Assignee: Mitsubishi Heavy Industries, Ltd.
    Inventor: Momoe Nagasaki
  • Patent number: 8523522
    Abstract: A functional rotor, desirably but not necessarily a Savonius, helical, or other vertical axis wind turbine rotor, has other functions in addition to driving a useful driven mechanism (such as an electricity or hydrogen generator, pump, etc.). The rotor has exterior rotating surface areas and at least one of design, aesthetic, holographic, reflective, and informational elements on those areas that create the illusion of movement distinct from the rotation of the rotor itself. The elements may be substantially vertical holographic material or reflective material stripes alternating with non-holographic or non-reflective stripes, or at least one of design and aesthetic elements disposed to create a spiral movement illusion. The elements may be selected and positioned so that a message or design is completed in the viewer's eye only upon rotation of the surface areas. The rotor may simulate a praxinoscope, phenakistascope, or zoetrope.
    Type: Grant
    Filed: February 8, 2007
    Date of Patent: September 3, 2013
    Inventor: Robert A. Vanderhye
  • Patent number: 8511988
    Abstract: A method for monitoring blade frequencies of a wind turbine and a monitoring system for performing the method are provided. An accelerometer or G-sensor is placed into a nacelle of a wind turbine and thereby measuring the vibrations of the nacelle. To extract the vibration signals originating from each blade, the vibration signals are combined with the measuring signals from the azimuth angle sensor (rotating angle), which is normally used for pitch control. To further extract each blade frequency a Fast Fourier Transformation is used on the modulated G-sensor signals. To further monitor a severe and alarming change in each blade frequency, each blade frequency is compared to the other blade frequencies and an alarm is set when a given level is reached.
    Type: Grant
    Filed: June 23, 2008
    Date of Patent: August 20, 2013
    Assignee: Siemens Aktiengesellschaft
    Inventors: Bo Birkemose, Per Egedal
  • Patent number: 8506265
    Abstract: An electric fan includes a fan shaft driven by a fan motor supported by a motor support. An oscillating device includes a rotational shaft connected to the motor support for driving the motor support to oscillate. A transmission gear has an axle connected to the rotational shaft and a gear wheel mounted around the axle and driven by a synchronous motor. An oscillating angle limiting switch detects a rotational angle of the rotational shaft and the gear wheel and sends a signal indicative of the rotational angle. A circuit board has a processor coupled to the oscillating angle limiting switch and receives the signal. A comparing program compares the rotational angle indicated by the signal with a selected one of a plurality of preset rotational angles. The synchronous motor is driven when the rotational angle indicated by the signal is equal to the selected preset rotational angle.
    Type: Grant
    Filed: May 20, 2010
    Date of Patent: August 13, 2013
    Inventor: Wen Ching Lee
  • Patent number: 8506249
    Abstract: Disclosed is a method of reducing a structural unbalance in a wind turbine rotor with pitch control and a control device for performing the method are provided. The method comprises the steps of: detecting a magnitude of the structural unbalance and its phase in relation the rotor's azimuth (?) on the basis of a measurement of the rotor's azimuth (?) and a measurement of the rotor speed or the generator speed (?), establishing individual pitch angle offsets for each blade of the rotor on the basis of the magnitude and the phase, and adding the individual pitch angle offsets to the respective pitch angles of the blades of the rotor.
    Type: Grant
    Filed: April 3, 2008
    Date of Patent: August 13, 2013
    Assignee: Siemens Aktiengesellschaft
    Inventor: Per Egedal
  • Patent number: 8506247
    Abstract: A wind turbine and a method of controlling yawing of a wind turbine are provided. A nacelle is mounted rotatable around a first axis by an adjustable yaw angle and a hub is mounted rotatable around a rotational axis. The hub includes a blade rotating around the rotational axis, the blade defining a rotor plane perpendicular to the rotational axis. A channel of the wind turbine has an opening, the opening being located at a predefined distance to the rotor plane. At least one component of incoming wind is guided through the opening and into the channel as air flow. A measuring device is provided for measuring the air flow, the measuring device being connected to a controller. The controller detects a yaw angle error between a direction of the incoming wind and the rotational axis, the yaw angle error being used to adjust the yaw angle of the nacelle.
    Type: Grant
    Filed: June 8, 2010
    Date of Patent: August 13, 2013
    Assignee: Siemens Aktiengesellschaft
    Inventor: Henrik Stiesdal
  • Patent number: 8500402
    Abstract: Described is a rotor blade for a wind power installation having a rotor blade leading edge. A deposit sensor device is arranged in the region of the rotor blade leading edge. That deposit sensor device has a transmitter for the wireless transmission of signals by way of a transmission link and a receiver for receiving the signals wirelessly transmitted by way of the transmission link. Deposits on the surface can be detected in the region of the transmission link on the basis of the signals transmitted by way of the transmission link.
    Type: Grant
    Filed: December 13, 2005
    Date of Patent: August 6, 2013
    Inventor: Aloys Wobben
  • Publication number: 20130195657
    Abstract: The invention relates to a method for detecting icing and other loadings on blades of wind turbines. Advantageously, the method utilizes existing wind turbine actuators, for example pitch actuators, far excitation of blade vibrations. Vibration sensors on the blade such as strain sensors or accelerometers measure the blade vibrations excited in response to the actively excised vibrations. By comparing the measured response with previously obtained reference responses, it is possible to determine if blade icing is present.
    Type: Application
    Filed: June 29, 2011
    Publication date: August 1, 2013
    Applicant: VESTAS WIND SYSTEMS A/S
    Inventors: Steen M. Lauritsen, Erik Carl Lehnskov Miranda
  • Publication number: 20130177417
    Abstract: The invention provides a method and system of detecting ice or other foreign matter on a wind turbine blade or damage to a wind turbine blade. The method in one aspect comprises: measuring twisting torque on the blade about its longitudinal axis to provide a detected torque signal; comparing a value based on the detected torque signal with a comparison value, the comparison value derived from one or more measured parameters having a predetermined relationship with the twisting torque about the longitudinal axis of the blade when the blade is operating under normal operating conditions; and determining that ice or other foreign matter is on the blade or that the blade is damaged if the value based on the detected torque signal differs from the comparison value by more than a predetermined amount. Wind turbine blades are designed such that any change in the shape of the blade reduces twisting torque on the blades significantly.
    Type: Application
    Filed: July 12, 2011
    Publication date: July 11, 2013
    Inventor: Ib Svend Olesen
  • Publication number: 20130170991
    Abstract: The invention provides a wind turbine blade comprising a first shell, having a first bonding region, and a second shell having a second bonding region, wherein the second bonding region of the second shell is bonded to the first bonding region of the first shell; and a temperature sensor positioned between the first bonding region and the second bonding region. Having a temperature sensor positioned within the turbine blade, in the region at which the two shells of the turbine blade are bonded together, allows for accurate determination and control of the temperature of the critical bonding regions during blade manufacture. The temperature sensor may be used during the service life of the wind turbine blade to detect delamination of the wind turbine blade.
    Type: Application
    Filed: July 6, 2011
    Publication date: July 4, 2013
    Applicant: VESTAS WIND SYSTEMS A/S
    Inventor: Ib Svend Olesen
  • Publication number: 20130170981
    Abstract: A wind turbine condition monitoring system and method are disclosed where the wind turbines include a tower, a gearbox coupled to the tower, and turbine blades coupled to the gearbox. The monitoring system includes blade sensors coupled to the blades, a hub node coupled to the gearbox and a controller. The controller is in communication with the hub node and blade sensors, and determines blade positions based on blade sensor readings. The blade sensors and hub node can include multi-axis accelerometers. The controller can wirelessly communicate with the blade sensors directly or through the hub node. Using position information, shadowing areas with obstructed communication can be avoided, node separation can be accounted for to reduce power requirements and/or interference from multiple transmitters can be avoided during node communications.
    Type: Application
    Filed: December 30, 2011
    Publication date: July 4, 2013
    Applicant: Robert Bosch GmbH
    Inventors: Christoph Lang, Peter Volkmer, Murat Senel, Vivek Jain, Lakshmi Venkatraman, Huang Lee
  • Patent number: 8475134
    Abstract: The method consists in depositing, by alumina spraying, an electrically insulating sublayer on the substrate, then in placing the sensor on the electrically insulating sublayer and finally in depositing, by alumina spraying, a cover layer on the sensor and the electrically insulating sublayer. It further includes, before the cover layer is deposited, a step in which an impermeable and thermally insulating cement is applied locally on wires of the sensor.
    Type: Grant
    Filed: October 6, 2009
    Date of Patent: July 2, 2013
    Assignee: SNECMA
    Inventors: Charly Buleon, Frederic Leman, Etienne Tulie
  • Patent number: 8475110
    Abstract: A system and method capable of performing online corrosion monitoring of a component installed in a gas turbine. A sensing device is located so that electrodes thereof are exposed to an operating environment within the gas turbine section containing the component. The electrodes are formed of a material so that the component and electrodes similarly respond to corrosive agents within the gas turbine section. The electrodes are electrically insulated from each other and each electrode is operable as an anodic electrode or a cathodic electrode, depending on the extent of corrosion thereat, so that each electrode has an electrical potential value, voltages exist across the electrodes, electric currents flow between the electrodes, and the electrical potential/current values correspond to corrosion behaviors at the anodic electrodes.
    Type: Grant
    Filed: July 30, 2009
    Date of Patent: July 2, 2013
    Assignee: General Electric Company
    Inventors: Rebecca Hefner, Jeff P. Czapiewski
  • Patent number: 8475128
    Abstract: The invention relates to a fairing adapted to be mounted on a wind turbine blade (2), wherein the outer surface of said fairing is arranged so as to reduce, when mounted on the blade, the aerodynamic drag in a flapwise (z) direction of the blade. In this way a reduction of the exciter power required in a flatwise fatigue test of the blade is achieved.
    Type: Grant
    Filed: December 14, 2009
    Date of Patent: July 2, 2013
    Assignee: Vestas Wind Systems A/S
    Inventor: Malcolm Barnsley
  • Publication number: 20130161956
    Abstract: The risk of an extreme gust of wind hitting a wind turbine is estimated by gathering data from one or more sensors for use as training data. This data is acquired over a period of time and is converted in to a feature vector for a given time period by a statistical measure. A number of feature zones are formed, each zone relating to a different estimate of risk with each feature vector being assigned to a risk category. The risk category is defined with reference to the value of one or more chosen turbine parameters at the time the data was acquired. The feature zones are formed from from a measure of distance such as the mean and co-variance of feature vectors from within a given category. Live data is processed by measuring the mahalonobis distance from the feature vector of the live data to the centre of each zone and the risk of an extreme gust is assessed as that of the feature zone to which the mahalonobis distance is lowest.
    Type: Application
    Filed: June 16, 2011
    Publication date: June 27, 2013
    Applicant: VESTAS WIND SYSTEMS A/S
    Inventor: Martin Evans
  • Publication number: 20130149145
    Abstract: The invention relates to a wind turbine, comprising a tower, a nacelle, at least one blade with a tip end and a root end and monitoring means for monitoring the surface condition of the blade, wherein said monitoring means are located at the tower or at the nacelle and wherein said monitoring means are adapted to monitor the surface condition of at least substantially one entire side of the blade from its tip end to its root end.
    Type: Application
    Filed: December 9, 2011
    Publication date: June 13, 2013
    Applicants: Euros Entwicklungsgesellschaft Fur Windkraftanlagen MBH, MITSUBISHI HEAVY INDUSTRIES, LTD.
    Inventors: Masaaki Shibata, Hidekazu Ichinose, Jens Alwart, Andreas Cremer
  • Patent number: 8454311
    Abstract: A monitoring system and associated operational method are operatively configured with a wind turbine for detecting separation of shell members along an edge of a wind turbine rotor blade. The system includes any configuration of sensors disposed within an internal cavity of the rotor blade, with the sensor oriented relative to a leading or trailing edge of the blade and configured to detect a physical characteristic within the blade that is indicative of onset of a separation between the shell members along the monitored edge. A controller is configured to receive signals from the sensor and to initiate an automatic response to a detected separation.
    Type: Grant
    Filed: September 29, 2011
    Date of Patent: June 4, 2013
    Assignee: General Electric Company
    Inventors: Vijaykumar Muppayya Hiremath, Vishal Chandra Harupka, D. Mallikarjuna Reddy
  • Publication number: 20130129510
    Abstract: A method for estimating an operating temperature of component in turbo machinery includes providing body detachably affixed to component, operating machinery, stopping operation of machinery, and removing body. The method includes obtaining concentration profile by determining final concentration of at least one species in first material and in second material, and determining a transient concentration of at least one species between first material and second material. The method includes determining an operating temperature by correlating concentration profile to corresponding operating temperature for system. A system including body is also provided. Body includes at least one species, a first material having a starting first concentration of the species, a second material arranged to permit migration of the species from first material to second material. Species migrates from first material to second material during operation of turbo machinery allowing body to estimate temperature during operation.
    Type: Application
    Filed: November 17, 2011
    Publication date: May 23, 2013
    Applicant: GENERAL ELECTRIC COMPANY
    Inventors: Jason Robert PAROLINI, Junyoung PARK, Canan Uslu HARDWICKE, Andrew Joseph DETOR
  • Publication number: 20130129511
    Abstract: An object is to provide a wind turbine and an apparatus and method for detecting damage to a wind-turbine-blade skin, which can reduce the workload of workers who are in charge of inspection for damage to a wind-turbine-blade skin. Provided is an apparatus for detecting damage to a wind-turbine-blade skin that detects damage to the skin of a wind turbine blade having a hollow structure, the apparatus including a pressure sensor that measures the internal pressure of the wind turbine blade; and a nacelle-side control unit that detects damage based on the pressure measured by the pressure sensor.
    Type: Application
    Filed: January 24, 2012
    Publication date: May 23, 2013
    Applicant: MITSUBISHI HEAVY INDUSTRIES, LTD.
    Inventors: Hiroyuki KAYAMA, Takao KUROIWA, Eiji KATO, Nobuyasu NAKAMURA, Tetsuya SAKIMURA