Abstract: An electric motor includes at least one bearing and a rotatably-mounted axle. During operation, generated sound can be detected by a sound sensor. A sound chamber is formed in the electric motor, and is delimited by several boundary surfaces. At least one of the boundary surfaces may include an acoustic surface that is formed by a surface of the bearing or by a surface of a body conducting sound. The sound sensor is arranged in the sound chamber to detect sound transmitted from the acoustic surface to the sound sensor. The motor may be part of a fan and/or a system having an evaluation unit. In the former case, an impeller is provided, which is connected to a rotor of the electric motor. In the second case, the evaluation unit has a communication interface via which readings of a sound sensor and/or processed readings from sensor electronics may be received.

Abstract: Using tachometer-from-vibration processing of component signals and appropriate configuration allows for the analysis of both the compressor turbine and the power turbine of a turboshaft, turboprop, or twin spindle turbofan engine. One smart vibration sensor is positioned on or near the turbo engine and detects vibration data for components of both the gas compressor turbine and power turbine without the need for direct measurements of tachometer data from both the compressor and power turbine. From this, condition indicators are determined for monitored components on the sensor and returned to an onboard control unit.

Abstract: A bearing monitoring apparatus includes a rolling bearing, multiple rolling elements, a strain gauge configured to detect strain of the outer ring or the inner ring, the strain gauge including at least two resistors, and the resistors being arranged in a same direction as an arrangement direction of the rolling elements so as to correspond to spacing between rolling elements that are next to each other. The bearing monitoring apparatus includes a first circuit configured to generate a first distorted waveform based on an output of one resistor and to generate a second distorted waveform based on an output of another resistor. The bearing monitoring apparatus includes a second circuit configured to subtract the second distorted waveform from the first distorted waveform to generate a differential waveform. The second circuit is configured to compare the differential waveform against a reference value to detect a wear state of the rolling bearing.

Abstract: A bearing monitoring/analysis system includes an acoustic emission sensor positioned adjacent a fluid film bearing, component thereof, or adjacent structure such that the acoustic emission sensor may collect a signal from the bearing, wherein the signal may be analyzed to allow a user to gain information regarding the fluid film bearing.

Abstract: Implementations disclosed describe a method and a system to perform the method of obtaining a reduced representation of a plurality of sensor statistics representative of data collected by a plurality of sensors associated with a device manufacturing system performing a manufacturing operation. The method further includes generating, using a plurality of outlier detection models, a plurality of outlier scores, each of the plurality of outlier scores generated based on the reduced representation of the plurality of sensor statistics using a respective one of the plurality of outlier detection models. The method further includes processing the plurality of outlier scores using a detector neural network to generate an anomaly score indicative of a likelihood of an anomaly associated with the manufacturing operation.

Abstract: It is provided a roller shutter for securing a physical space within a vehicle. The roller shutter comprises: a protective barrier configured to be in a rolled up, open, state, and in a rolled down, protective state; a mesh of conductors being attached to the protective barrier; a processor; and a memory storing instructions that, when executed by the processor, cause the roller shutter to: detect a physical break in the mesh of conductors; when a break in the mesh of conductors is connected, signal that a break-in is detected, determine a valid open request; open the roller shutter when the valid open request is determined; determine when a user has exited the vehicle; and close the roller shutter when the user exit has been determined.

Abstract: A boot method is provided for an electronic device. The boot method includes acquiring a boot signal; performing a booting process based on the boot signal; and, based on the boot signal, generating a feedback provided to the boot signal to indicate the booting process.

Abstract: The present disclosure provides methods and systems for the characterization of a potential microtexture region (MTR) of a sample, component, or the like. The methods may include determining a threshold width of spatial correlation coefficient and/or a threshold spatial correlation coefficient slope for an actual MTR, characterizing a potential MTR as an actual MTR or a defect, characterizing an actual MTR as an acceptable MTR or not, and/or characterizing various components with potential MTRs as defective or not. The characterization may include calculating a width of spatial correlation coefficient and/or a spatial correlation coefficient slope of the potential MTR and comparing the width of spatial correlation coefficient to a threshold width of spatial correlation coefficient and/or comparing the spatial correlation coefficient slope to a threshold spatial correlation coefficient slope for the potential MTR to be characterized as an actual MTR or a defect (crack).

Abstract: A method for determining an item of fastening information of a wheel of a motor vehicle, wherein rotational movements of the wheel are detected by at least one sensor. The sensor provides a wheel speed signal to an electronic control unit, which determines the fastening information from the wheel speed signal. A first time-frequency transformation of the wheel speed signal is carried out, whereby a first transformation signal is generated, after which a second time-frequency transformation of the first transformation signal is carried out. A second transformation signal is generated, in particular after which a first fastening parameter is obtained from the second transformation signal, after which the fastening information is calculated/determined as a function of the second transformation signal and/or the first fastening parameter.

Abstract: A method of monitoring a turbocharger system makes use of vibrational behaviour to predict potential future failure modes. Changes in sub-synchronous vibrational behaviour of the turbocharger assembly may be used to distinguish between failure modes such as wear and coking. Rate of change of sub-synchronous vibrational behaviour may be used to predict time before likely failure. Also disclosed is a turbocharger system configured to perform the method.

Abstract: A transmission shaft assembly for use in a sequential test of flexible thin-walled bearings includes a power connecting member, a clamping device and a plurality of bearing mounting kits. The bearing mounting kits are located between the power connecting member and the clamping device. The clamping device penetrates a central bore of each of the bearing mounting kits and is connected to the power connecting member. The power connecting member, the clamping device and the bearing mounting kits are connected into one piece. The power connecting member includes a spindle shank and a blind rivet. The bearing mounting kit includes a bearing mounting sleeve seat, a rear retaining ring, a front retaining ring, a bearing locking bolt and a tightening nut. The clamping device includes a clamping bolt, a washer and a spring washer.

Abstract: A flaking development analysis method and a flaking development analysis device for a raceway ring of a rolling bearing which make it possible to, after fine flaking occurs, predict a relationship between an elapsed time and a shape of a flaked portion based on a development speed of the flaking, and perform bearing replacement at an appropriate timing.

Abstract: A system and method for online estimate of the filling level of balls and loading level in a rotary mills, comprising a set of vibration sensors unit, associated with a magnet to transmit data signals via an antenna to a receiver that receives data signals from the antenna, an antenna, wherein the receiver is connected via optical fiber to a signal processor, which in turn communicates to a control server via a UTP cable, wherein the control server also obtains data from the mill operation to determine the best filling of balls and load; and the operating method.

Abstract: A measurement method using an inductive proximity sensor connected to a cable, the measurement method including the following steps: applying to the cable an excitation voltage at a known reference frequency; acquiring a measurement voltage representative of the excitation current that flows in the cable and in the sensor under the effect of the excitation voltage; multiplying the measurement voltage both by a first reference signal in order to obtain a first measurement signal and also by a second reference signal in order to obtain a second measurement signal; using the first measurement signal and the second measurement signal to evaluate a measurement impedance representative of the impedance of the sensor and of the cable; using the measurement impedance to estimate the inductance of the sensor or the impedance of the sensor; and comparing the inductance of the sensor or the impedance of the sensor with a predefined detection threshold in order to obtain proximity information.

Abstract: A method for monitoring the health of a rotating machine mounted on a vehicle is disclosed. The method may include: receiving identifying information of the vehicle, the rotating machine, and a portable vibration sensor mounted on the rotating machine; receiving vibration data from the portable vibration sensor during a test of the rotating machine, the received vibration data being associated with the identifying information of the vehicle, the rotating machine, and the portable vibration sensor; comparing the received vibration data with known vibration data for the rotating machine; generating an alert if the received vibration data exceeds a predetermined threshold value of the known vibration data; generating a health report for the rotating machine based on the received vibration data; and transmitting the health report to a user via a web portal.

Abstract: A method for fault diagnosis of a bearing includes detecting, using an oil debris monitor (ODM) sensor, ODM data corresponding to an amount of debris flowing downstream from the bearing. The method also includes detecting, using a vibration sensor, vibration data corresponding to vibration of the bearing during use. The method also includes determining, by a controller, a vibration stage flag corresponding to a severity of damage of the bearing based on the vibration data. The method also includes determining, by the controller, a severity level of the damage of the bearing based on a combination of the vibration stage flag and the ODM data. The method also includes outputting, by an output device, the severity level.

Abstract: This invention relates to a bearing monitoring method and system suitable for the monitoring of faults in rolling element bearings. The method and system utilize an acceleration sensor that is sensitive to both acceleration and housing strain and which has the effect of amplifying acceleration events that coincide with areas of the housing strain signal that correspond to bearing ball-pass events. The housing strain signal due to ball-pass events can be used to synchronise or otherwise modify the sampling of acceleration signals, or to determine bearing performance characteristics.

Abstract: A new system is described that is able to detect mechanical failures in a rotating shaft or shafts such as those which may be found in an aircraft or other mechanical device or vehicle. The system comprises a first accelerometer provided on the rotating shaft to be monitored and a reference accelerometer provided elsewhere. The system can compensate information received from these accelerometers so as to determine a fault in the rotating shaft that is being monitored.

Abstract: An abnormality treatment apparatus includes: a sensor which outputs a signal upon detecting an event caused by contact of a rotor of a rotating machine during rotation of the rotor; and a control unit which executes at least one of rotation number control of reducing the number of rotations of the rotor step by step, liquid injection control of injecting liquid into a housing chamber of the rotor step by step, and pressure control of lowering a discharge pressure of the rotating machine step by step based on reception of the signal output from the sensor.

Abstract: A method and a device for carrying out a method for conducting vibration-diagnostic monitoring and assessment of individual machine parts (M1, . . . Mn) of a machine (M), preferably a rotating machine, using a frequency analyzer.

Abstract: Provided is a method for detecting an incipient damage in a bearing including receiving from a plurality of sensors of the bearing a plurality of signals corresponding to a plurality of bursts, each burst being emitted each time an indentation is met during the rotation of the bearing at a contact point between a roller of the bearing and a race of the bearing, analyzing the signals for locating on the bearing the indentations corresponding to the bursts, generating a map of points on a digital model of the bearing corresponding to the indentations on the bearing, the map of points being registered and updated throughout at least an interval of the lifetime of the bearing, identifying an incipient damage in the bearing each time the distribution of the points in the map is not random, and generating an incipient damage warning message.

Abstract: An electronic controller of a valve actuator predictively calculates motor inputs that will cause the actuator to apply desired forces or torques to a valve. A force/torque sensor of the actuator measures applied force or torque at the motor output and/or valve to verify the applied force or torque and enable updating of calibration settings as needed. Upon failure of the force/torque sensor, embodiments continue predictive operation without sensor verification or calibration updates. Upon failure of the predictive control, embodiments continue valve actuation under reactive control via the force/torque sensor. Connection to a calibration valve simulator enables embodiments to perform an initial self-calibration using the force/torque sensor of the actuator. The motor can be a variable frequency driven AC motor or a DC motor. The calibration can incorporate mechanical properties of an actuator gear train.

Abstract: A method is detect inadequate valve seat integrity in a control element of a control valve is proposed, wherein during a calibration time interval the position of the control element of the control valve in the closed position are repeatedly measured and recorded. Measuring of the position in the closed position continues during operation, and a moving average value is determined over a specified number of values. A threshold is determined from the calibration data set and the specified number. If the moving average deviates from the average of the calibration data by more than this threshold, a message is output. In particular, no additional sensors or scanning devices are required and a sensible compromise between early fault detection and avoidance of false diagnoses is achieved.

Abstract: A sensor apparatus for a magnetic bearing apparatus includes a motion sensor and a sensor ring which has the shape of a hollow cylinder and is intended to be connected to a shaft of an electrical rotating machine in a force-fitting manner, wherein the motion sensor is separated from the sensor ring by an air gap. In order to achieve a greater degree of reliability at high rotation speeds and ratings in comparison to the prior art, the sensor ring has a carrier ring composed of a first material and a sensor target composed of a second material.

Abstract: It is an object to perform an abnormality diagnosis for a feed axis without additionally adding a sensor or the like. A frequency characteristic of a feed axis and a damage frequency that occurs when the feed axis that has been damaged performs an axis operation are obtained, a frequency where a gain is maximized in the obtained frequency characteristic is calculated, and a feed velocity where the frequency matches the damage frequency is calculated. An axis operation is performed on the feed axis with the calculated feed velocity, and a frequency analysis is performed on servo information regarding a control of a servo motor during the axis operation. Then, the presence and absence of a peak of the damage frequency is confirmed from a result of the frequency analysis, and when the peak is present, it is determined that it is abnormal.

Abstract: A device for monitoring healthy status of machinery mounts is provided, which may include a plurality of vibration detectors, a signal acquisition device and a signal processor. The vibration detectors may detect the vibration signals from of a machine device, where the machine device may include a plurality of machinery mounts. The signal acquisition device may receive the vibration signals of the vibration detectors. The signal processor may execute a modal frequency analysis process to analyze the vibration signals of the vibration detectors, and calculate a vibration mode corresponding to the natural frequency of the machinery mounts in current status to serve as the test mode; then, the signal processor may compare the test mode with a reference mode to determine the healthy status of the machinery mounts, where the reference mode is corresponding to the natural frequency of the machinery mounts in the optimized status.

Abstract: A non-transitory computer readable medium stores instructions that are executed by a processor of a monitoring that when executed, the processor receives a state of at least one operational parameter of the turbomachinery. Then, the processor determines whether the state is within a region of accuracy of a stored record of a stored state stored in the memory. When the state is within the region of accuracy, the processor determines at least one operating condition from the stored record. Alternatively, when the state is not within the first region of accuracy, the processor stores the state as a new record in the memory.

Abstract: A system, a hand-held vibration monitor and a method for setting vibrational alarms for machinery. The system includes a vibrational alarm device having a plurality of vibration data inputs from a machinery group, a memory for storing historical vibration data from the machinery group, an accumulator for generating average vibrational data for the machinery group, a processor for selecting a vibration alarm limit based on a cumulative distribution curve of the average vibrational data, and a warning alarm to alert a user that the machinery has reached the vibrational alarm limit when vibration data from a machine in the machinery group reaches the vibrational alarm limit.

Abstract: A method of measuring and analyzing vibrations of a mechanical system, e.g., for performing gear and bearing fault detection within a system having a reference shaft and a plurality of rotating components. The method may include the steps of tabulating gear ratios of the plurality of rotating components relative to the reference shaft in integer form, establishing a measurement specification and communicating the measurement specification to a digitizer, recording vibration data from the mechanical system during operation, and resampling the recorded vibration data using the tabulated gear ratios to obtain vibration data corresponding to the rotating components and a vibration signature for a component of interest at predetermined angular increments.

Abstract: Disclosed herein is a vibration monitoring and diagnosing system for monitoring conditions of a wind power generator and diagnosing a defective portion thereof using vibration characteristics obtained from acceleration sensors mounted to the wind power generator. A vibration-based defect detecting method may include: collecting vibration data of the wind power generator using the plurality of sensors; extracting a first characteristic value of a time domain based on the vibration data; extracting characteristic values in one or more frequency bands for a location of each sensor in a frequency domain or an envelope frequency domain if the first characteristic value is greater than a preset alarm setting value; and determining that a defect is present when at least one characteristic value of the characteristic values is greater than a preset normal value.

Abstract: A method for detecting a damaged-bearing in an engine using a vibration signal may include: separating, by a controller, a vibration signal of the engine detected by a vibration detecting device installed on one side of the engine of a vehicle into a vibration signal caused by combustion knocking and a vibration signal generated in a bearing, extracting a signal in a predetermined natural frequency band from the vibration signal generated in the bearing using a band-pass filter, and processing the extracted signal to a quantified bearing signal using the controller, and comparing the quantified bearing signal with a preset damaged-bearing criterion using the controller to determine whether the quantified bearing signal is equal to or higher than the preset damaged-bearing criterion to determine a damage to the bearing.

Abstract: A method for grouping content displayed on a graphical user interface may include displaying selectable components that correspond to types of measurement data associated with a device or a component within the device. The method may then include receiving a selection of one of the selectable components, such that the one of the selectable components corresponds to a portion of the measurement data. The method may then receive a grouping mode input to specify characteristics for display of the portion of the data as data processing outputs. The method may then include displaying the data processing outputs associated with the selection, such that each respective data processing output may include visualizations associated with datasets of the portion of the measurement data. The respective visualizations of the respective data processing output may be displayed together based on an association between the respective datasets and the grouping mode input.

Abstract: Methods and systems to achieve highly efficient rotational machine integrity determinations in which at least one sensor (106) senses indicia (105) such as time-varying rotational indicia from a rotational motive apparatus (103) and a processor (108) may provide many different functions including but not limited to operational function energy apportioning decisional processing, data compression, intelligent hierarchical data ranking, differential data processing, or the like perhaps to generate information (109) such as a rotational integrity abridgment transmissor to which an abridgment transmissor electromagnetic signal (112) may be created and perhaps even transmitted from a rotational motive apparatus to facilitate a machine integrity determination.

Abstract: A system for a gas turbine engine includes an electrical interface device, a sensing/control/identification device, and a remote processing unit. The electrical interface device has electrical interface device data. The electrical interface device is operatively connected to a sub-system component that is provided with a shielding. The sensing/control/identification device is disposed within the sub-system component and is attached to the electrical interface device. The remote processing unit is in electromagnetic communication with the sensing/control/identification device.

Abstract: The present disclosure provides a sensor system for measuring a parameter of a body. The sensor system includes a housing mountable to a rotating part of the body. The housing includes a first dual-axis accelerometer having a first measurement axis and a second measurement axis, the first dual-axis accelerometer arranged to measure a first acceleration along the first measurement axis and a second acceleration along the second measurement axis and a second dual-axis accelerometer having a third measurement axis and a fourth measurement axis, the second dual-axis accelerometer arranged to measure a third acceleration along the third measurement axis and a fourth acceleration along the fourth measurement axis. The sensor system also includes a processor configured to receive the first, second, third and fourth measured accelerations and determine from the first, second, third and fourth measured accelerations the parameter.

Abstract: There is provided a wireless sensor-equipped bearing. A plurality of magnets are fixed between pockets of a retainer formed of an annular body such that an N pole and an S pole of the magnets neighbor in a circumferential direction of the annular body. A coil, a circuit unit and an antenna are fixed to a surface of a first seal, the surface being opposed to the magnets. A sensor is disposed on any one of an inner ring, an outer ring and the first seal.

Abstract: Engine health monitoring is used to assess the health of an engine, such as a gas turbine engine. Blades mounted on a shaft produce a modal response when excited. The shaft has an order related component that varies with the rotational velocity of the shaft. Modal responses are increased when the natural frequency range of the selected blade mode intersects with one of the order related components. By applying a short time chirp-Fourier transform with a frequency speed that is a function of a rate of change in the rotational velocity of the shaft a selected signal can be isolated. Cracks in the blades can be detected from the isolated signal.

Abstract: Provided is a test apparatus including a fixing jig for vibration test of a battery pack. The fixing jig includes at least one upper block that is coupled to at least one coupler formed in the battery pack, a lower block placed below the at least one upper block, and a base plate having a board shaped and placed below the lower block.

Abstract: A method of detecting inconsistencies in a composite structure is presented. A pulsed laser beam is directed towards the composite structure comprised of a number of composite materials. Wide-band ultrasonic signals are formed in the composite structure when radiation of the pulsed laser beam is absorbed by a surface of the composite structure. The wide-band ultrasonic signals are detected over a duration of time to form data. The data comprises an ultrasonic A-scan spectrum. The data is processed to identify a structure signal in a frequency domain of the ultrasonic A-scan spectrum. The structure signal of the ultrasonic A-scan spectrum is compared to a structure signal of a composite structure standard to determine whether the inconsistencies are present in the number of composite materials.

Abstract: A measuring system for detecting variables on planet carriers of a planetary gear train having a plurality of planetary gear stages includes a first sensor which is arranged on one of the planet carriers of one of the planetary gear stages for detecting the variables of a planet gear rotationally connected to the at least one of the planet carriers. An electronics configured for arrangement on the planetary gear train is operably connected to the first sensor for supply of the first sensor with electrical energy.

Abstract: A ball bearing inspection device includes: an arbor supporting an inner ring on the outer circumferential surface; a rotary drive unit driving the arbor; a first pressing unit applying a preload to a ball bearing; a second pressing unit applying a preload in an opposite direction of the pressing direction; and a vibration detection unit detecting vibration from the ball bearing. The arbor includes an abutting section that protrudes outward from the outer circumferential surface, a movable flange arranged apart from the abutting section, and a flange drive mechanism switching the movable flange between a first state in which the movable flange protrudes from the outer circumferential surface and a second state in which the movable flange is accommodated within the arbor. The flange drive mechanism is additionally provided with a drive force supply unit that applies drive force for switching to the first or the second state.

Abstract: A method of measuring and analyzing vibrations of a mechanical system, e.g., for performing gear and bearing fault detection within a system having a reference shaft and a plurality of rotating components. The method may include the steps of tabulating gear ratios of the plurality of rotating components relative to the reference shaft in integer form, establishing a measurement specification and communicating the measurement specification to a digitizer, recording vibration data from the mechanical system during operation, and resampling the recorded vibration data using the tabulated gear ratios to obtain vibration data corresponding to the rotating components and a vibration signature for a component of interest at predetermined angular increments.

Abstract: A system and method are provided for equipment sound monitoring. The system includes an electromechanical device having at least one cavity defined therein. A dampening tube is such that at least a portion of the dampening tube is received within the at least one cavity without contacting a surface of the electromechanical device. A transducer box includes an opening defined therein, the opening configured to receive at least a portion of the dampening tube. The transducer box further includes a sound detection module configured to detect at least one of audio and vibration associated with the electromechanical device. A method of connecting and using the equipment sound monitoring system are provided.

Abstract: A sticker for attaching to at least one part of a machine having at least one rotating component that is to be monitored is provided. The sticker includes a vibration status indicator arranged to indicate when a vibration of the machine having the at least one rotating component exceeds a predetermined level. Also, a condition monitoring system for monitoring the condition of a machine having at least one rotating component is provided. The monitoring system provides at least one such sticker and a device that is arranged to collect information from the at least one sticker.

Abstract: Method for detecting bearing defect severity based on bearing rotation speed and at least one data sample of sensor data obtained to measure vibrations of a bearing ring is provided. The method includes converting the data sample from time domain to frequency domain to obtain a signal frequency spectrum; determining a defect center frequency of the bearing using the rotation speed; and identifying a predetermined number of frequency peaks of the signal frequency spectrum. A total vibration energy in an overall frequency band including the predetermined number of frequency peaks is first determined; next, for each of the frequency peaks, a peak energy as a spectral energy of signal components giving rise to the frequency peaks is determined; calculating a bearing defect spectral energy using the peak energies; and finally a ratio of the bearing defect spectral energy and a total vibration energy to assess a defect severity is obtained.

Abstract: A system for anticipating low-speed bearing failure triggers a notification when a noise generated by the low-speed bearing exceeds a threshold. The system predicts failure far in advance of the actual failure. The system includes an accelerometer for detecting the noise generated by the bearing. The signal produced by the accelerometer is processed using a band pass filter, an amplifier/rectifier, an averaging filter, and a voltage to current converter. The signal and raw data are transmitted to a remote monitoring system, such as a computer. The signal is further analyzed, such as to produce a best-fit line. When the signal exceeds a predetermined threshold, such as when the amount or the slope of the best-fit line exceeds a value, the remote system notifies a monitor to schedule maintenance.

Abstract: A method of detecting a preload of a linear guide includes: applying an external force to the linear guide with an external force applying device, wherein the external force applying device sends an impact signal while applying the external force; sensing with a sensor a vibration signal sent from the linear guide because of vibration thereof which occurs under the external force; and receiving the impact signal of the external force applying device and the vibration signal of the sensor and calculating the preload of the linear guide according to a received result, with a signal analyzer. Therefore, with the method of the present invention, the preload of the linear guide is precisely tested regardless of environmental factors.

Abstract: A sensor unit is configured as a single body, removably mounted in its entirety to a test point location on a machine so machine vibrations propagate into the single body. Within are an accelerometer, circuit board, wireless interface, signal processor, and battery. The sensor unit transmits sensor data wirelessly in real time to a data collection unit. A technician with data collection unit in hand goes from machine to machine, along a route of multiple test point locations on multiple machines, mounting and dismounting the sensor unit and collecting machine vibration data. The sensor unit is configured to reduce frequency response impacts of the mass and volume of the circuit board, wireless interface, signal processor, and battery on dynamic behavior of the sensor unit with respect to machine vibrations to achieve a frequency response rating comparable to a wired sensor.

Abstract: The rotor of the turbine is monitored by sensors of the rotor vibrations arranged in at least one plane of measuring perpendicular to the axis of the rotor and by sensors of the absolute vibrations of the bearings. When using this method of processing, synchronically digitalized signals of the sensors of rotor vibrations, first the arithmetic mean of the individual harmonic bands in full spectrum in the frequency domain is calculated, by which means the information about the subharmonic components and their multiples in the full spectrum of these signals is transferred into the frequency band ?1X to 1X, at the same time is by the calculation of the median estimated the level of the signal noise, with which individual frequency bands of the full spectrum are encumbered, and which is subtracted from the amplitudes in the individual frequency bands of full spectrum of the signals of the sensors.

Abstract: In a control apparatus, a fundamental voltage generator generates, based on a target rotational speed, a fundamental voltage command for a fundamental voltage. A property storage stores a natural vibration property of a rotor when the rotor is rotating as a rotating vibration property. A rotating state detector detects a rotating position and a rotational speed of the rotor as a rotating state of the rotor. A harmonic voltage generator generates, based on the rotating state of the rotor and the rotating vibration property, a harmonic voltage command to be superimposed on the fundamental voltage command generated by the fundamental voltage generator.