Patents by Inventor Mahadevan Balasubramaniam

Mahadevan Balasubramaniam has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Publication number: 20130321000
    Abstract: A radial clearance measurement system is provided. The radial clearance measurement system comprises a radial clearance sensor that is relatively insensitive to axial movement of an object rotating relative to the radial clearance sensor. In one embodiment, the radial clearance sensor includes an electrode having a relatively constant overlap area over the range of axial movement of the object.
    Type: Application
    Filed: May 31, 2012
    Publication date: December 5, 2013
    Applicant: General Electric Company
    Inventors: Emad Andarawis Andarawis, Wayne Charles Hasz, Mahadevan Balasubramaniam, David Richard Esler
  • 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
  • Publication number: 20130256086
    Abstract: An actuator decoupler for selectively coupling and decoupling a driving part and a driven part of an actuation system is disclosed. The driving part can be coupled to the actuator decoupler, and the actuator decoupler can be coupled to the driven part via at least one coupling pin. In a selectively coupled state, the driven part can be at least one of rotationally and longitudinally fixed to the actuator decoupler and, thereby, the driving part. The actuator decoupler can be decoupled from the driven part through the use of a preloaded energy mechanism configured to disengage the at least one coupling pin from the driven part. Thereby, the actuator may be responsive to a jam in the actuation system to selectively decouple the driven part from the actuator decoupler and the driving part so that the driven part has freedom to translate at least one of rotationally and longitudinally.
    Type: Application
    Filed: March 30, 2012
    Publication date: October 3, 2013
    Applicant: GENERAL ELECTRIC COMPANY
    Inventors: Suyu HOU, George GHANIME, David J. WAGNER, Michael Colan MOSCINSKI, Robert ZIRIN, Mahadevan BALASUBRAMANIAM
  • Patent number: 8536878
    Abstract: A sensor system for measuring a clearance parameter between a stationary component and a rotating component of a rotating machine is provided. The system includes a clearance sensor to output a clearance measurement signal. A sensor memory is attached to the sensor for storing a first sensor information. A second sensor information is stored in a electronics interface memory. The first and the second sensor information are read and the clearance sensor is matched with a respective plurality of calibration data by an electronic interface based on the first and the second sensor information.
    Type: Grant
    Filed: August 10, 2011
    Date of Patent: September 17, 2013
    Assignee: General Electric Company
    Inventors: Emad Andarawis Andarawis, Wayne Charles Hasz, David So Keung Chan, David Mulford Shaddock, John Harry Down, Samhita Dasgupta, David Walter Parry, David Richard Esler, Zhiyuan Ren, Mahadevan Balasubramaniam, Cheryl Herron
  • Patent number: 8521143
    Abstract: Methods and apparatus for use in communicating messages to multiple recipients are described. A wireless device receives a first input request for creating a new message, and also receives one or more second input requests for selecting a plurality of recipient identifiers for the new message. The wireless device also receives a third input request which indicates whether or not the message is for a group conversation. When the third input request indicates group conversation, the wireless device formats the recipient identifiers in first header fields (e.g., CC header fields) of an MMS message. When the third input request indicates no group conversation, the wireless device alternatively formats the recipient identifiers in second header fields (e.g., BCC header fields) of the MMS message. The MMS message is then transmitted to the recipient identifiers via a wireless network. Recipient devices may process the message as group or non-group (e.g.
    Type: Grant
    Filed: April 15, 2011
    Date of Patent: August 27, 2013
    Assignee: BlackBerry Limited
    Inventors: Mahadevan Balasubramaniam, Ryan Alexander Holt
  • Patent number: 8272246
    Abstract: Self-calibration of a multiple channel clearance sensor system, which in one embodiment includes at least one sensor for measuring at least one clearance parameter signal between a stationary object and a rotating object of a rotating machine. The sensor output is processed as a clearance parameter by an offset correction section configured to determine an offset error in the clearance parameter signal which is used by a level shifter. The level shifter is also switchably coupled to the clearance parameter signal wherein the output of the level shifter, which may be amplified and digitally converted, is processed by a signal level analyzer to determine a channel gain signal.
    Type: Grant
    Filed: September 30, 2008
    Date of Patent: September 25, 2012
    Assignee: General Electric Company
    Inventors: Emad Andarawis Andarawis, Wayne Charles Hasz, David So Keung Chan, David Mulford Shaddock, John Harry Down, Samhita Dasgupta, David Richard Esler, Zhiyuan Ren, Mahadevan Balasubramaniam, Ibrahim Issoufou Kouada
  • Patent number: 8180185
    Abstract: A fiber optic sensor is provided. The fiber optic sensor includes a fiber core having a plurality of grating elements wherein, the grating elements comprise a periodic or a quasiperiodic modulated microcrystalline and silicon dioxide tetrahedral structure and a cladding disposed about the fiber core.
    Type: Grant
    Filed: February 5, 2008
    Date of Patent: May 15, 2012
    Assignee: General Electric Company
    Inventors: Hua Xia, Mahadevan Balasubramaniam, Jie Jiang, Huageng Luo, Abdul Rahman Abdallah Al-Khalidy, Clayton Ming Young, Kevin Thomas McCarthy
  • Patent number: 8177474
    Abstract: A method of detecting rubs during operation of a turbomachine comprising at least one rotating object having a tip and a shelf is provided. The method includes generating signals representative of a sensed parameter and processing the signals to generate height versus time data for the tip. The height of the tip corresponds to the distance between the tip and the shelf. The method further includes monitoring the height versus time data, in order to determine whether a change in the height data exceeds a threshold value, and detecting a rub of the rotating object(s) on a second object, when the change in the height data exceeds the threshold value. A rub detection system for a turbomachine and a turbine engine system with rub detection are also provided.
    Type: Grant
    Filed: June 26, 2007
    Date of Patent: May 15, 2012
    Assignee: General Electric Company
    Inventors: Emad Andarawis Andarawis, William Lee Herron, Samhita Dasgupta, John Harry Down, Mahadevan Balasubramaniam, David So Keung Chan, David Walter Parry
  • Patent number: 8121813
    Abstract: A processing system for clearance estimation in a rotating machine includes one or more sensors and one or more digital signal processors for calculating the estimated clearance. The processing system may include techniques for obtaining real-time clearance estimates and techniques for obtaining averaged clearance estimates. Aspects of the processing system may also include a method of switching between real-time clearance estimates and averaged clearance estimates depending on the operating conditions of the rotating machine. Other aspects of the processing system include the use of two digital signal processors: a first digital signal processor configured to receive signals from a clearance sensor and perform a first set of high speed processing tasks, and a second digital signal processor configured to receive signals from the first digital signal processor and perform a second set of lower speed processing tasks.
    Type: Grant
    Filed: January 28, 2009
    Date of Patent: February 21, 2012
    Assignee: General Electric Company
    Inventors: Zhiyuan Ren, Wayne Charles Hasz, Emad Andarawis Andarawis, David So Keung Chan, David Mulford Shaddock, John Harry Down, Samhita Dasgupta, William Lee Herron, Cheryl Lynn Herron, legal representative, David Walter Parry, David Richard Esler, Mahadevan Balasubramaniam
  • Publication number: 20110295538
    Abstract: A sensor system for measuring a clearance parameter between a stationary component and a rotating component of a rotating machine is provided. The system includes a clearance sensor to output a clearance measurement signal. A sensor memory is attached to the sensor for storing a first sensor information. A second sensor information is stored in a electronics interface memory. The first and the second sensor information are read and the clearance sensor is matched with a respective plurality of calibration data by an electronic interface based on the first and the second sensor information.
    Type: Application
    Filed: August 10, 2011
    Publication date: December 1, 2011
    Applicant: GENERAL ELECTRIC COMPANY
    Inventors: Emad Andarawis Andarawis, Wayne Charles Hasz, David So Keung Chan, David Mulford Shaddock, John Harry Down, Samhita Dasgupta, David Walter Parry, David Richard Esler, Zhiyuan Ren, Mahadevan Balasubramaniam, William Lee Herron, Cheryl Herron
  • Publication number: 20110281596
    Abstract: Methods and apparatus for use in communicating messages to multiple recipients are described. A wireless device receives a first input request for creating a new message, and also receives one or more second input requests for selecting a plurality of recipient identifiers for the new message. The wireless device also receives a third input request which indicates whether or not the message is for a group conversation. When the third input request indicates group conversation, the wireless device formats the recipient identifiers in first header fields (e.g., CC header fields) of an MMS message. When the third input request indicates no group conversation, the wireless device alternatively formats the recipient identifiers in second header fields (e.g., BCC header fields) of the MMS message. The MMS message is then transmitted to the recipient identifiers via a wireless network. Recipient devices may process the message as group or non-group (e.g.
    Type: Application
    Filed: April 15, 2011
    Publication date: November 17, 2011
    Applicant: RESEARCH IN MOTION LIMITED
    Inventors: Mahadevan Balasubramaniam, Ryan Alexander Holt
  • Patent number: 8022715
    Abstract: A sensor system for measuring a clearance parameter between a stationary component and a rotating component of a rotating machine is provided. The system includes a clearance sensor to output a clearance measurement signal. A sensor memory is attached to the sensor for storing a first sensor information. A second sensor information is stored in a electronics interface memory. The first and the second sensor information are read and the clearance sensor is matched with a respective plurality of calibration data by an electronic interface based on the first and the second sensor information.
    Type: Grant
    Filed: January 27, 2009
    Date of Patent: September 20, 2011
    Assignee: General Electric Company
    Inventors: Emad Andarawis Andarawis, Wayne Charles Hasz, David So Keung Chan, David Mulford Shaddock, John Harry Down, Samhita Dasgupta, David Walter Parry, David Richard Esler, Zhiyuan Ren, Mahadevan Balasubramaniam, William Lee Herron, Cheryl Herron, legal representative
  • Publication number: 20110170823
    Abstract: A fiber optic sensor is provided. The fiber optic sensor includes a fiber core having a plurality of grating elements wherein, the grating elements comprise a periodic or a quasiperiodic modulated microcrystalline and silicon dioxide tetrahedral structure and a cladding disposed about the fiber core.
    Type: Application
    Filed: February 5, 2008
    Publication date: July 14, 2011
    Applicant: GENERAL ELECTRIC COMPANY
    Inventors: Hua Xia, Mahadevan Balasubramaniam, Jie Jiang, Huageng Luo, Abdul Rahman Abdallah Al-Khalidy, Clayton Ming Young, Kevin Thomas McCarthy
  • Patent number: 7817422
    Abstract: A heat sink for directly cooling at least one electronic device package is provided. The electronic device package has an upper contact surface and a lower contact surface. The heat sink comprises a cooling piece formed of at least one thermally conductive material. The cooling piece defines multiple inlet manifolds configured to receive a coolant and multiple outlet manifolds configured to exhaust the coolant. The inlet and outlet manifolds are interleaved. The cooling piece further defines multiple millichannels configured to receive the coolant from the inlet manifolds and to deliver the coolant to the outlet manifolds. The millichannels and inlet and outlet manifolds are further configured to directly cool one of the upper and lower contact surface of the electronic device package by direct contact with the coolant, such that the heat sink comprises an integral heat sink.
    Type: Grant
    Filed: August 18, 2008
    Date of Patent: October 19, 2010
    Assignee: General Electric Company
    Inventors: Satish Sivarama Gunturi, Mahadevan Balasubramaniam, Ramakrishna Venkata Mallina, Richard Alfred Beaupre, Le Yan, Richard S. Zhang, Ljubisa Dragoljub Stevanovic, Adam Gregory Pautsch, Stephen Adam Solovitz
  • Publication number: 20100242293
    Abstract: A transient clearance measurement apparatus for determining a minimum clearance between stationary and rotating components includes: at least one rub pin secured to the stationary component and projecting toward a surface of the rotating component. The at least one rub pin has one or more embedded wires completing an electrical circuit, such that, in use, when the at least one rub pin is rubbed by the surface of the rotating component, the electrical circuit is broken.
    Type: Application
    Filed: March 30, 2009
    Publication date: September 30, 2010
    Applicant: General Electric Company
    Inventors: Fred WILLETT, David Esler, Mahadevan Balasubramaniam
  • Publication number: 20100191502
    Abstract: A processing system for clearance estimation in a rotating machine includes one or more sensors and one or more digital signal processors for calculating the estimated clearance. The processing system may include techniques for obtaining real-time clearance estimates and techniques for obtaining averaged clearance estimates. Aspects of the processing system may also include a method of switching between real-time clearance estimates and averaged clearance estimates depending on the operating conditions of the rotating machine. Other aspects of the processing system include the use of two digital signal processors: a first digital signal processor configured to receive signals from a clearance sensor and perform a first set of high speed processing tasks, and a second digital signal processor configured to receive signals from the first digital signal processor and perform a second set of lower speed processing tasks.
    Type: Application
    Filed: January 28, 2009
    Publication date: July 29, 2010
    Applicant: General Electric Company
    Inventors: Zhiyuan Ren, Wayne Charles Hasz, Emad Andarawis Andarawis, David So Keung Chan, David Mulford Shaddock, John Harry Down, Samhita Dasgupta, William Lee Herron, David Walter Parry, Cheryl Lynn Herron, David Richard Esler, Mahadevan Balasubramaniam
  • Publication number: 20100188100
    Abstract: A sensor system for measuring a clearance parameter between a stationary component and a rotating component of a rotating machine is provided. The system includes a clearance sensor to output a clearance measurement signal. A sensor memory is attached to the sensor for storing a first sensor information. A second sensor information is stored in a electronics interface memory. The first and the second sensor information are read and the clearance sensor is matched with a respective plurality of calibration data by an electronic interface based on the first and the second sensor information.
    Type: Application
    Filed: January 27, 2009
    Publication date: July 29, 2010
    Applicant: GENERAL ELECTRIC COMPANY
    Inventors: Emad Andarawis Andarawis, Wayne Charles Hasz, David So Keung Chan, David Mulford Shaddock, John Harry Down, Samhita Dasgupta, David Walter Parry, David Richard Esler, Zhiyuan Ren, Mahadevan Balasubramaniam, William Lee Herron, Cheryl Herron
  • Patent number: 7722310
    Abstract: A system for measuring clearance between a first object and a second object is provided. The system includes a sensor configuration to generate a first signal representative of a first sensed parameter and a second signal representative of a second sensed parameter. The system also includes a clearance measurement unit configured to process the first and second signals based upon a ratiometric technique to calculate clearance between the first and second objects.
    Type: Grant
    Filed: December 17, 2004
    Date of Patent: May 25, 2010
    Assignee: General Electric Company
    Inventors: Mahadevan Balasubramaniam, Emad Andarawis Andarawis, James Anthony Ruud, Samhita Dasgupta, Minesh Ashok Shah
  • Publication number: 20100077830
    Abstract: Self-calibration of a multiple channel clearance sensor system, which in one embodiment includes at least one sensor for measuring at least one clearance parameter signal between a stationary object and a rotating object of a rotating machine. The sensor output is processed as a clearance parameter by an offset correction section configured to determine an offset error in the clearance parameter signal which is used by a level shifter. The level shifter is also switchably coupled to the clearance parameter signal wherein the output of the level shifter, which may be amplified and digitally converted, is processed by a signal level analyzer to determine a channel gain signal.
    Type: Application
    Filed: September 30, 2008
    Publication date: April 1, 2010
    Applicant: GENERAL ELECTRIC COMPANY
    Inventors: Emad Andarawis Andarawis, Wayne Charles Hasz, David So Keung Chan, David Mulford Shaddock, John Harry Down, Samhita Dasgupta, David Richard Esler, Zhiyuan Ren, Mahadevan Balasubramaniam, Ibrahim Issoufou Kouada
  • Publication number: 20100038058
    Abstract: A heat sink for directly cooling at least one electronic device package is provided. The electronic device package has an upper contact surface and a lower contact surface. The heat sink comprises a cooling piece formed of at least one thermally conductive material. The cooling piece defines multiple inlet manifolds configured to receive a coolant and multiple outlet manifolds configured to exhaust the coolant. The inlet and outlet manifolds are interleaved. The cooling piece further defines multiple millichannels configured to receive the coolant from the inlet manifolds and to deliver the coolant to the outlet manifolds. The millichannels and inlet and outlet manifolds are further configured to directly cool one of the upper and lower contact surface of the electronic device package by direct contact with the coolant, such that the heat sink comprises an integral heat sink.
    Type: Application
    Filed: August 18, 2008
    Publication date: February 18, 2010
    Applicant: GENERAL ELECTRIC COMPANY
    Inventors: Satish Sivarama Gunturi, Mahadevan Balasubramaniam, Ramakrishna Venkata Mallina, Richard Alfred Beaupre, Le Yan, Richard S. Zhang, Ljubisa Dragoljub Stevanovic, Adam Gregory Pautsch, Stephen Adam Solovitz