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963 results about "Vibration based" patented technology
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Vibration monitoring-based wind generator set automatic fault diagnosis method
InactiveCN101858778AAvoid lossEasy accessSubsonic/sonic/ultrasonic wave measurementEngine testingWind power generationReliability engineering
The invention discloses a vibration monitoring-based wind generator set automatic fault diagnosis method. The method comprises the following steps: an acceleration sensor collects original vibration signals, a pre-communication subsystem stores and uploads data, and a central monitoring server receives data and stores the data in a database. The method also comprises the step of establishing a fault characteristic frequency library in the database which is used as the basis of fault diagnosis. The method of the invention can automatically realize the fault early warning and fault diagnosis of the key parts of the wind generator set; and the fault characteristic frequency pool can be continuously updated to realize the self-learning function of the method, thus improving the fault diagnosis function continuously.
Owner:ZHEJIANG UNIV
Acoustic wave device and method of producing the same
InactiveUS20040104791A1Improve reliabilityImpedence networksSemiconductor/solid-state device detailsAcoustic waveElectric signal
An acoustic wave device includes: a first substrate that has a vibration unit that generates solid vibrations based on an input electric signal, and an electrode pad unit that introduces the electric signal into the vibration unit; and a second substrate that has through holes for connecting the electrode pad unit to external electrodes. In this acoustic wave device, at least the vibration unit of the first substrate is hermetically sealed by bonding the first substrate and the second substrate to each other.
Owner:FUJITSU MEDIA DEVICES +1
Noise/vibration reduction control
InactiveUS20150100221A1Undesirable effectAnalogue computers for vehiclesSilencing apparatusInternal combustion engineControl theory
In one aspect, a system for reducing noise or vibration generated by an internal combustion engine is described. An engine controller is arranged to generate firing information suitable for operating the working chambers of the engine in a skip fire manner to deliver a desired amount of torque. A noise / vibration reduction unit is arranged to help reduce noise or vibration based on the firing information. The noise / vibration controller actively controls a device that is not a part of the engine to alter an NVH characteristic of the vehicle in a desired manner based at least in part on a skip fire characteristic.
Owner:TULA TECH INC
Dandelion-like multi-directional broadband piezoelectric vibration energy collection device
InactiveCN102013837AEfficient collectionImprove adaptabilityPiezoelectric/electrostriction/magnetostriction machinesCantilevered beamElectricity
The invention discloses a dandelion-like multi-directional broadband piezoelectric vibration energy collection device, comprising a multi-spherical support body, a vibration base and at least two cantilever beams, the vibration base is fixed to a surface of the multi-spherical support body, and each cantilever beam is fixed to the surface of the multi-spherical support body along different directions; the cantilever beam comprises an elastic metal conductive slice, an upper-layer piezoelectricity ceramic piece, a lower-layer piezoelectricity ceramic piece and a mass block, a fixing end of the elastic metal conductive slice is fixed to the surface of the multi-spherical support body, and the mass block is fixed to a free end of the elastic metal conductive slice, and the upper-layer piezoelectricity ceramic piece and the lower-layer piezoelectricity ceramic piece are respectively adhered to an upper surface and a lower surface of the elastic metal conductive slice in same direction. The dandelion-like multi-directional broadband piezoelectric vibration energy collection device can collect the vibration energy with relatively high efficiency no matter how vibration direction changes or when the vibration changes in multiple directions with multiple frequencies.
Owner:NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
Vacuum breaker mechanical state detecting method based on vibration signal analysis
ActiveCN103308292AEffective noise cancellationEfficient decompositionMachine part testingSubsonic/sonic/ultrasonic wave measurementFeature vectorWavelet decomposition
The invention discloses a vacuum breaker mechanical state detecting method based on vibration signal analysis. The method comprises the following steps: 1), acquiring the vibration signal in the action process of a VS1 vacuum breaker; 2), performing wavelet decomposition to the vibration signal acquired in the step 1) in order to de-noise; 3), for the signal subjected to the wavelet decomposition, reconstructing the signal in each frequency band, drawing the reconstructed signal of each frequency band in a time-frequency-signal amplitude spectrum of the signal by mat lab, and calculating the information entropy of each frequency domain band and combining the information entropy of each frequency band of the vibration signal with each other to form a fault feature vector; and 4), inputting the fault feature vector calculated in the step 3) into a well trained neutral network and sort, so as to realize the state detection of the vacuum breaker.
Owner:STATE GRID CORP OF CHINA +2
Vibration-based power generator
InactiveUS8222754B1Minimizing velocityHigh bandwidthPiezoelectric/electrostriction/magnetostriction machinesMachines/enginesVariable stiffnessInertial mass
A vibration-based power generator has a variable stiffness oscillator connected to a base. The oscillator comprises an inertial mass moving relative to the base in response to vibrations. The oscillator has a neutral position corresponding to a position of the oscillator when no vibrations are transmitted to the base. The oscillator has a first position where the mass is at a first distance and a second position where the inertial mass is at a second distance from a position of the mass when the oscillator is in neutral position. The second distance is greater than the first distance. A stiffness of the oscillator at the second position is greater than a stiffness of the oscillator at the first position. A transducer generating electric power in response to movement of the inertial mass is associated with the oscillator. A method of optimizing a vibration-based power generator is also presented.
Owner:SOUNDS ENERGY SYST
Method and system for reducing motion sickness in virtual reality ride systems
ActiveUS20150325027A1Reduce motion sicknessReduce confusionMedical devicesCathode-ray tube indicatorsMotion sicknessMotion processing
A virtual reality ride system including a headset, a control unit, and a dynamic platform. The headset includes a display unit configured to display a video of an animated virtual environment. The control unit includes one or more processors configured to perform render processing that renders the video of the virtual environment; event motion processing that generates first data representing motions associated with events in the virtual environment; and low-frequency motion processing that generates second data representing low-frequency vibrations unrelated to the events in the virtual environment. The dynamic platform is configured to produce the motions associated with the events in the virtual environment based on the first data, and to produce the low-frequency vibrations based on the second data. The low-frequency vibrations include a frequency between about 5 Hz and 70 Hz.
Owner:DREAMWORKS ANIMATION LLC
Method for evaluating degree of mechanical fault of frame-type circuit breaker based on vibration signal
InactiveCN107101813AEffective guidance and maintenanceImplement state detectionMachine part testingCircuit interrupters testingSupport vector machineFeature vector
The invention discloses a method for evaluating the degree of a mechanical fault of a frame-type circuit breaker based on a vibration signal. The vibration signal in the method is a mechanical vibration signal collected by a frame-type circuit breaker mechanical fault detection system in the switching process of the frame-type circuit breaker. The method comprises the steps: employing a wavelet packet to carry out the denoising preprocessing of the vibration signal; carrying out the adaptive decomposition of a denoised vibration signal through employing a local mean decomposition algorithm; screening out the former d PF components with the maximum correlation with an original vibration signal; carrying out the improved multiscale arrangement entropy analysis of al PF components, and carrying out the dimension reduction of a feature vector formed by the above improved multiscale arrangement entropy values through the PCA method; building a fault feature vector; constructing a multi-class supporting vector machine, and carrying out the pattern recognition; carrying out the quantitative evaluation of the severity of the mechanical fault happening in the switching process of the circuit breaker through referring to the fault degree characteristic curves in different fault modes. The method is stable, is reliable and is effective.
Owner:HEBEI UNIV OF TECH
Vibration Based Damage Detection System
InactiveUS20100089161A1Analysing solids using sonic/ultrasonic/infrasonic wavesVibration testingComputer monitorLED display
The present invention provides methods of assessing damage on a joint that includes energizing the joint, detecting the vibration of the joint using one or more signal generating sensors, processing the signal(s), and applying a damage index to the processed signal(s), wherein the damage index incorporates a processed control signal generated by a sensor(s) at or near the joint when the joint was healthy, i.e., in a substantially undamaged state. Another aspect of the present invention provides a pipeline that includes at least two pipe segments, at least one joint connecting the two pipe segments, and at least one signal generating sensor affixed to the pipeline that is capable of detecting vibration at or near the joint, at least one signal processor that is capable of EMD processing the signal, and an output device (e.g., computer monitor, LED display, a light bulb, an electronic alarm, or other sound or light generating device).
Owner:DALHOUSIE UNIV
Laminated piezoelectric downhole energy collection device
InactiveCN105006991AIncrease output powerBatteries circuit arrangementsPiezoelectric/electrostriction/magnetostriction machinesElectricityInjection well
The present invention provides a laminated piezoelectric downhole energy collection device, which comprises a pipeline, a support frame, a laminated piezoelectric sheet, a mass block, a rectifier circuit and a rechargeable battery. The support frame is connected to the pipeline in the sealed manner and extends out of the pipeline. The support frame has the functions of supporting the laminated piezoelectric sheet, leading out a wire and serving as a bluff body. One end of the laminated piezoelectric sheet is fixedly connected with the support frame, and the other end of the laminated piezoelectric sheet is connected with the mass block. One end of the rectifier circuit is connected to the wire, and the other end of the rectifier circuit is connected to the changing battery. The electric energy generated by the laminated piezoelectric sheet is transmitted to the rectifier circuit via the wire, and is directly used for charging the rechargeable battery after being converted by the rectifier circuit. By means of the device, the electricity is generated directly under the fluid-solid coupled interaction effect inside the pipeline. Therefore, the device is simple in structure and convenient to install. The device can be used for vibration-based power generation in an oil injection well to directly charge downhole batteries.
Owner:SHANGHAI JIAO TONG UNIV
Analysis method for testing fatigue life of components based on vibration signals
InactiveCN105651478ASolve the problem that it is difficult to directly obtain structural stress amplitude informationExtended service lifeVibration testingLoad timeEngineering
Owner:QINGDAO R & D INST XIAN JIAOTONG UNIV
Vibration-based NVH control during idle operation of an automobile powertrain
ActiveUS7174879B1Affect customer satisfactionReduce NVHElectrical controlNon-fuel substance addition to fuelVibration basedPowertrain
A system and method of operating a vehicle powertrain that employs active control to reduce NVH, particularly during idle. The method includes selectively operating the powertrain in at least a non-idle condition and an idle condition; receiving vibration signals from a sensor disposed on an internal combustion engine; controlling spark timing of the internal combustion engine based on vibration signals received from the sensor; and during the idle condition, modifying a speed and / or a load of the internal combustion engine based on vibration signals received from the sensor.
Owner:FORD GLOBAL TECH LLC
Method for denoising acoustic testing data of porcelain insulator vibration based on wavelet decomposition threshold denoising
InactiveCN102928517AEffective filteringImprove accuracyProcessing detected response signalTime domainMulti resolution
The invention discloses a method for denoising acoustic testing data of porcelain insulator vibration based on wavelet decomposition threshold denoising. The method comprises the following steps: using a vibration acoustic method to detect a porcelain insulator to acquire a porcelain insulator vibration response signal containing noise; selecting a suitable wavelet basis function for the porcelain insulator vibration response signal containing noise and then carrying out multi-resolution wavelet decomposition, and transforming the vibration response from a time domain to a wavelet domain; rationally selecting a threshold function and a threshold, and machining a wavelet coefficient corresponding to the noise according to the threshold function; carrying out wavelet reconstruction, transforming the vibration response after denoising treatment to the time domain from the wavelet domain; storing the de-noised vibration response and sorting an acoustic testing result of the porcelain insulator vibration. According to the method, the noise in the acoustic testing data of the porcelain insulator vibration can be effectively filtered, so that sorting accuracy is improved.
Owner:STATE GRID HEBEI ELECTRIC POWER RES INST +2
Electric damper
ActiveUS20090224502A1Suppress transmissionSpringsDigital data processing detailsControl signalMotor Drive Unit
An electric damper which does not transmit unbalance wheel vibration to a vehicle body is provided. A low-pass cutoff frequency setting unit and a high-pass cutoff frequency setting unit respectively set the cutoff frequencies for band-stop filters to a frequency band corresponding to unbalance wheel vibration based on a signal indicating a vehicle speed from a vehicle speed sensor, and a function as a band-stop filter comprising a low-pass filter computation unit, a high-pass filter computation unit and an adder is computed for a displacement rate of the vertical motion of a wheel calculated by a differentiating unit in a damper control unit. A damper control amount computation unit calculates a control amount of controlling an electric motor for a motor-driven damper based on the calculated filtered displacement rate, and outputs a control signal to a motor driving unit through a driving circuit output unit.
Owner:HONDA MOTOR CO LTD
Large steam turbine-generator set rotor crack fault real-time diagnosis method
InactiveCN101532911AMethod scienceReliable conclusionMachine part testingVibration amplitudeEngineering
The invention discloses a large steam turbine-generator set rotor crack fault real-time diagnosis method belonging to the filed of mechanical vibration state monitoring and fault diagnosis. Necessary computational analysis and judgment for vibration data are carried out by collecting the vibration signal of a rotor shaft of a steam turbine. The shaft vibration base frequency vibration amplitude and double frequency vibration amplitude at both sides of the rotor are computed in real time and the shaft vibration base frequency vibration amplitude is validated in real time so that the shaft vibration base frequency vibration amplitude at any side of the rotor is judged whether to be larger than vibration amplitude threshold value. Combined with least square method and product-moment correlation coefficient calculating method, real-time quantitative computational analysis, such as incremental validation of the shaft vibration base frequency vibration amplitude and incremental validation of double frequency vibration amplitude of shaft vibration, is carried out on the vibration data of shaft vibration base frequency. Based on the quantitative computational analysis and combined with each verification result, on-line diagnosis of the generator set whether to have rotor crack fault is automatically carried out in real time. The method has the advantages of scientific method and reliable conclusion, and on-line monitoring and fault diagnosis can be automatically realized in real time.
Owner:NORTH CHINA ELECTRIC POWER UNIV (BAODING)
Vibration reduction device and vibration detecting device and micro signal processing device for use in vibration reduction device
InactiveUS6801247B1Television system detailsColor television detailsSignal processing circuitsSignal generator
A vibration detecting device for detecting vibration in a camera, a video movie camera or the like, a vibration reduction device and a micro signal processing circuit. The vibration detecting device comprises a vibration detector for detecting a vibration to output a vibration detecting signal, a calculator for performing a predetermined operation based on the vibration detecting signal, and a controller for determining whether or not an operation output signal of the calculator exceeds a predetermined range. The controller is provided with an operation signal generator for generating an operation signal when the operation output signal exceeds the predetermined range, and the calculator is provided with an initializing portion for returning the operation output signal into the predetermined range based on the operation signal. In the vibration detecting circuit, a DC offset component can be suppressed.
Owner:NIKON CORP
High voltage line wind deviation online monitoring system and method based on vibration power generation
InactiveCN102288153AAngle measurementIndication of weather conditions using multiple variablesGeneral Packet Radio ServiceData acquisition
The invention provides a monitoring system and a method for precisely measuring high-voltage line windage. The system is composed of a windage monitoring device, a meteorological monitoring device, a monitoring base station and a monitoring centre. Functions of acquisition and transmission of windage and meteorological data, failure pre-warning, real-time control and data processing and displaying are realized. The windage monitoring device comprises a sensor module, a signal modulating module, a signal control and wireless transceiving module, a GPS (Global Position System) module, an MCU (Micro Control Unit) and a vibration power generating module. The device is unnecessary to be additionally provided with a power supply. The power of the device is completely supplied by the miniature vibration power generating module. A field monitoring device transmits data to the monitoring base station through a short-distance wireless communication module. Then, the data is sent to the monitoring centre through a GPRS (General Packet Radio Service) network of the base station. The monitoring centre also can reversely transmit instruction so that the operation state of the device is adjusted. Simultaneously, the windage monitoring device is designed in a low-power-consumption mode integrating dormancy, standby and timed transmission. A mechanism for automatically rousing by exceeding a preset threshold is operated. The system and the method disclosed by the invention are applicable to online-monitoring a high-voltage line.
Owner:SICHUAN UNIV
GIS (Geographic Information System) fault diagnosis system and method based on vibration signal spectrum analysis
ActiveCN102735968ASimple structureEasy to implementVibration measurement in solidsElectrical testingFrequency spectrumVibration acceleration
The invention discloses a GIS (Geographic Information System) fault diagnosis system and method based on vibration signal spectrum analysis, belonging to the field of GIS fault monitoring. The system comprises a vibration acceleration sensor, a charge amplifier, a data acquisition instrument and a PC (Personal Computer) all of which are successively connected together in series, wherein the vibration acceleration sensor comprises three vibration sensors which are fixed on the outer surface of a GIS box in the X-axis, Y-axis and Z-axis directions, respectively. The diagnosis method of the system comprises the following steps of: acquiring GIS vibration signals in the X-axis, Y-axis and Z-axis directions by means of the three vibration sensors; performing wavelet de-noising on the vibration signals intercepted by a full period and then performing spectrum analysis; calculating energy at 50 Hz and the sum of energy at 100 Hz, energy at 200 Hz and energy at 300 Hz respectively; comparing the calculated values with the normal state; and determining the GIS fault according to the result of comparison in combination with a threshold. The method is easy in engineering realization, obvious in feature and capable of effectively diagnosing the GIS fault.
Owner:JIANGSU ELECTRIC POWER CO +2
Vibration Based Injection Molding Machine Damage Detection and Health Monitoring
InactiveUS20080111264A1Auxillary shaping apparatusUsing mechanical meansFrequency spectrumEngineering
A system and method for evaluating the structural integrity of an injection molding machine and / or a component thereof may comprise at least one sensor operatively connected to a component of the injection molding machine. The sensor may transmit a signal representative of the movement of the injection molding machine. A processor may convert this signal into a frequency domain signal and compare it against a frequency template. Changes to the structural integrity of the injection molding machine may result in changes to the system's frequency response spectrum such as, but not limited to, amplification of certain frequency peaks, amplitude variations, changes in the damping characteristics, the shifting of the fundamental mode (i.e., the first natural frequency), shifting of higher order modes (those above the fundamental mode), or the introduction of a new frequency mode of vibration that did not exist prior to the damage of the component.
Owner:HUSKY INJECTION MOLDING SYST LTD
Vibrating platform with precise driving mechanism
ActiveCN102721520AAchieving large-amplitude drivingEasy to drive with large amplitudeVibration testingEngineeringHeavy load
A vibrating platform with a precise driving mechanism in the technical field of precise driving comprises a support frame, at least one driving mechanism arranged in the support frame and a vibrating platform body connected with the driving mechanism. The driving mechanism comprises a driver, a driver outputting rod, a drive displacement amplifying mechanism, an amplifying displacement output end rod and a direct displacement output end rod, wherein the driver, the driver outputting rod and the drive displacement amplifying mechanism are sequentially arranged from bottom to top, and the amplifying displacement output end rod and the direct displacement output end rod are respectively arranged on the drive displacement amplifying mechanism and the driver outputting rod. The vibrating platform with the precise driving mechanism produces direct displacement driving vibration based on flexible deformation of an intelligent material, is simple in structure, high in reliability and drive efficiency, accurate and controllable in amplitude and capable of achieving wide amplitude particularly from nanometer to a plurality of millimeters and achieving a wideband from a quasi-static state to high frequency, and has heavy-load vibrating capability.
Owner:SHANGHAI JIAO TONG UNIV
Active vibration control system
InactiveUS7017857B2Control vibrationEasy to controlPropellersMechanical oscillations controlControl systemChaotic systems
An active vibration control system including a sensor responsive to a source of vibration and which provides an output signal representative of the vibrations; at least one actuator positioned to impart canceling vibrations to the source of vibrations based on an input signal; a correction subsystem responsive to the actuator for estimating the sensor output in the absence of the canceling vibrations and which outputs a corrected output signal representative only of the vibrations emanating from the source; and a state space predictor responsive to the corrected output signal for determining the input signal to the actuator based on variations in the corrected output signal to better control vibrations especially in chaotic systems.
Owner:FOSTER-MILLER
Image capturing apparatus and control method thereof
InactiveUS20110157381A1Improves vibration correction abilityImprove abilitiesTelevision system detailsPrintersMotion vectorVibration detection
An image capturing apparatus comprises: an image sensing unit arranged to sense an object image; a vibration detection unit arranged to detect a vibration applied to the image capturing apparatus; a vector detection unit arranged to detect a motion vector from an image sensed by the image sensing unit; a first calculation unit arranged to calculate a first correction amount from a signal obtained based on an output from the vibration detection unit and a signal based on the motion vector; a second calculation unit arranged to calculate a second correction amount based on the motion vector; a first correction unit arranged to optically correct the vibration based on the first correction amount; and a second correction unit arranged to correct the vibration by changing an image read region based on the second correction amount, wherein vibration correction is performed using both the first and second correction units.
Owner:CANON KK
Component vibration based cylinder deactivation control system and method
The present invention relates to air cylinder stop control system based on component vibrating and method thereof, particularly relates to a method of changing an active cylinder count of an engine may include determining a vehicle vibration limit and a vehicle vibration level. The cylinder count may be modified (increased or decreased) based upon the vehicle vibration limit and the vehicle vibration level. The vehicle vibration limit may be based upon a vehicle speed, and a coolant temperature of the engine. The vehicle vibration level may be based upon at least one of a desired torque of the engine and a number of active cylinders of the engine. According to other features, the vehicle vibration level may be based upon a measured vibration level of a vehicle component.
Owner:GM GLOBAL TECH OPERATIONS LLC
Robot controller, simple installation-type robot, and method of controlling simple installation-type robot
ActiveUS20120277912A1Simple configurationProgramme controlProgramme-controlled manipulatorSimulationControl theory
A robot includes an angular velocity sensor that detects the vibration of a robot. A control device allows the robot to perform a trial operation and acquires the measurement result measured by the angular velocity sensor during the trial operation as vibration information and analyzes the acquired vibration information based on maker evaluating information that is stored in a database. In the maker evaluating information, vibration information and the operating speed appropriate to the installation situation of the robot at which the vibration information is measured are associated with each other. Then, the robot is operated at an operating speed selected based on the analysis result of the vibration information.
Owner:SEIKO EPSON CORP
Vibration-based ejection cassette, drug dispensing apparatus, PTP dispensing apparatus, pharmaceutical product storage apparatus and PTP dispensing system
A vibration-assisted ejection cassette includes: outer plates 11 which align PTP-packaged drugs 20 for storage; a top frame 12 which is provided above an open front and which prevents accommodated drugs from being falling forward; an inner plate 13 which carries the accommodated drugs and advances the drugs when vibrated; and a vibrating member 15 which vibrates the inner plate 13. Thereby, vibration is exploited to maintain the drugs 20 in alignment with each other, advance the drugs while maintaining the drugs in alignment and eject them one by one. Additionally, a retention member 18 for retaining an ejected drug is provided in front of the open front. A control circuit 17 activates or stops activating the vibrating member 15 in accordance with whether or not an ejection detecting member detects that a drug is being retained. In this way, it is ensured that drugs are either manually picked up one by one or ejected by an automatic mechanism in an equally easy and stable manner.
Owner:TOSHO INC
Process device with vibration based diagnostics
An process device for use in an industrial process control or monitoring system is configured to couple to a process. A vibration sensor is configured to sense vibrations. Diagnostic circuitry provides a diagnostic output based upon the sensed vibrations.
Owner:ROSEMOUNT INC
Tool abrasion state monitoring method based on vibration signal and Stacking ensemble model
ActiveCN109514349AEnable wear monitoringSolving Wear Condition Monitoring ChallengesMeasurement/indication equipmentsTime domainFeature set
The invention discloses a tool abrasion state monitoring method based on a vibration signal and a Stacking ensemble model. The vibration signal of a machine tool spindle in the machining process is utilized, and the vibration signal is subjected to feature extraction through time-domain analysis, frequency-domain analysis and ensemble empirical mode decomposition (EEMD); then extracted features are screened through a Relief F-SVM algorithm to obtain an optimal feature set; the width of a tool abrasion blade belt serves as the abrasion label value, and an ensemble monitoring model is built based on a Stacking ensemble strategy through the optimal feature set and the abrasion label value; and after the model is built, the vibration signal in the machining process is monitored and processed to obtain the signal feature set to be input into the ensemble monitoring model, and the tool abrasion label value, namely the tool abrasion state is obtained. The tool abrasion state can be monitoredbased on the vibration signal and the Stacking ensemble model.
Owner:XI AN JIAOTONG UNIV
Driver device, physical quantity measuring device, and electronic instrument
ActiveUS20110121907A1Acceleration measurement using interia forcesPulse automatic controlVoltage converterCurrent voltage
A driver device that forms an oscillation loop with a vibrator and causes the vibrator to produce driving vibrations includes a current-voltage converter that converts a current that flows through the vibrator into a voltage, an output circuit that causes the vibrator to produce the driving vibrations based on a signal that is converted into a voltage with respect to a given voltage, and a high-pass filter that is provided in the oscillation loop between the current-voltage converter and the output circuit. The driver device causes the vibrator to produce the driving vibrations while changing a reference potential of the high-pass filter, and then causes the vibrator to produce the driving vibrations while fixing the reference potential.
Owner:COLUMBIA PEAK VENTURES LLC
Online detection method for vacuum circuit breaker contact on-off time based on vibration analysis
InactiveCN1595188AExtension of timeImprove anti-interference abilityCircuit interrupters testingSample lengthFixed position
This invention discloses a vacuum breaker probes on or off moment on-line measurement method based on vibration analysis, which comprises the following steps: first to select the fix position and direction of the vibration sensor; second to set sample order, sample frequency, sample length and trigger means and to store the sample data; third to pre-process the vibration data; fourth to select moving window function type and length and adopt short-time energy calculation for further analysis; fifth to select threshold value to determine the on or off moments of triphase probes; sixth to calculate the closing term and closing time according to the on or off moments. This invention improves the affair resolution ability and anti-interference ability in the vibration signal analysis.
Owner:XI AN JIAOTONG UNIV
Wind turbine online condition monitoring and health assessment system and method thereof based on vibration and oil
InactiveCN104977047AIncrease online monitoring meansMeet real-time maintenance needsMachine gearing/transmission testingMachine bearings testingVibration accelerationData acquisition
The invention provides a wind turbine online condition monitoring and health assessment system and a method thereof based on vibration and oil. The system comprises a vibration acceleration sensor, a vibration data acquisition device, an iron spectrometer, a data analysis device, a data processing module, a health estimation module and a remote diagnostic center. The vibration data acquisition device acquires the vibration signal of each part. The iron spectrometer collects and analyzes the iron spectrum value of gearbox oil. The data analysis device carries out time domain analysis, frequency domain analysis and time frequency analysis on the vibration signal and iron spectrum. Combined with a wind farm SCADA system, the data processing module processes wind speed, rotation speed and temperature signals and a data analysis result. According to the data analysis result, the health estimation module estimates the state of a wind turbine and judges the existence of a fault, a fault type and a fault degree. Each signal and analysis processing result is sent to the remote diagnostic center, the wind turbine is subjected to remote monitoring, centralized control, remote diagnosis, and expert consultation if necessary.
Owner:CHINA THREE GORGES CORPORATION +2
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