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2014results about "Machine gearing/transmission testing" patented technology

Extraction method for early failure sensitive characteristics based on ensemble empirical mode decomposition (EEMD) and wavelet packet transform

The invention relates to an extraction method for early failure sensitive characteristics based on ensemble empirical mode decomposition (EEMD) and wavelet packet transform. The extraction method for the early failure sensitive characteristics based on the EEMD and the wavelet packet transform includes the following steps: (1), collected original vibration signals of mechanical and electrical equipment are decomposed according to the EEMD, white noise is added, and intrinsic mode function (IMF) components are obtained through decomposition; (2), the sensitive IMF components closely related to failure are chosen, and other irrelative IMF components are ignored; (3), the sensitive IMF components chosen through step (2) are decomposed in an orthogonal wavelet packet mode, and a wavelet coefficient of each node is obtained; and (4), envelopes are extracted from the obtained wavelet packet coefficients by adoption of the Hilbert transform and the Fourier transform, power spectrums are calculated, the power spectrum corresponding to each wavelet packet coefficient is obtained and serves as the early failure sensitive characteristic , and the sensitive characteristics are automatically obtained. Self-adapting signals can be decomposed, the sensitive characteristics can be convenient to obtain automatically, diagnosis precision and speed are improved, and a mechanical and electrical system can be diagnosed quickly, accurately and stably. The extraction method for the early failure sensitive characteristics based on the EEMD and the wavelet packet transform can be applied to the field of mechanical and electrical equipment failure diagnosis.
Owner:BEIJING INFORMATION SCI & TECH UNIV

Comprehensive performance experiment platform for water-lubricated bearings and transmission systems

ActiveCN102269654AReal performance testPerformance testing is completeMachine gearing/transmission testingMachine bearings testingLow noiseDrive motor
The invention discloses a water lubricated bearing and transmission system comprehensive performance testing platform, which comprises a water lubricated bearing, a dynamic seal device, an elastic coupling, a gearbox, a water circulating system, a driving motor, an intermediate bearing, a bearing block, a loading and testing device and other parts. The loading device loads a test shaft in the circumferential direction, axial direction and radial direction so as to simulate complicated working conditions of the water lubricated bearing and the transmission system thereof; the testing system can detect various parameters of the water lubricated bearing, such as working speed, torque, temperature, frictional characteristics, water film pressure distribution, interface deformation distribution, shaft centerline orbit, noise and dynamic characteristics, and comprehensive performance of the dynamic seal, the elastic coupling and the transmission system on line; and the testing platform can be applied to research of scientific problems such as the loading bearing of a water lubricated friction pair, failure mechanism and evolution law, tribological performance and dynamic service behaviors, and provides a key scientific and technological basis for developing a pollution-free, low-noise, high-reliability, long-life, high-efficiency and energy-saving water lubricated bearing and a transmission system thereof.
Owner:CHONGQING UNIV

Intelligent gearbox fault diagnosis method based on mixed inference and neural network

The invention relates to an intelligent gearbox fault diagnosis method based on mixed inference and neural network, mainly comprising the following steps: enriching a knowledge base of an intelligent diagnosis system; storing expert knowledge into a computer; combining the neural network to recognize patterns; analyzing a main abnormal phenomenon of a gearbox; systematically researching generation mechanisms of vibration and noise of a gear; analyzing a mathematical model of gear vibration; analyzing the vibration mechanisms of various fault types by fully using on-site fault data; enriching time domain and frequency domain characteristics of various faults; and ensuring a characteristic extraction method of gear fault signals. A data analysis method mainly comprises the steps: band-pass filter frequency analysis, double-meaning analysis, envelope demodulation analysis and demodulation analysis based on EMD. The intelligent gearbox fault diagnosis method based on mixed inference and neural network solves the problems of the traditional serial information processing in the fields of pattern recognition, artificial intelligence, and the like so that a pattern recognition network is completely realized by the computer; and the intelligent gearbox fault diagnosis method based on mixed inference and neural network is convenient to realize the automation and the intelligence of the fault diagnosis and can provide a basis for a diagnosis decision in time.
Owner:BEIJING UNIV OF TECH

Wind turbine set gearbox remote online state monitoring and life assessment method

The invention provides a wind turbine set gearbox remote online state monitoring and life assessment method. The method comprises the following steps: (1) a remote center computer collects a real-time operation parameter, temperature data and vibration data of each wind turbine through SCADA; (2) through analyzing the characteristic values of signal time domain and frequency domain, whether a vibration sensor has a fault or not is diagnosed; (3) the data is subjected to normalization process, a difference between data is reduced, and the diagnosis precision is raised; (4) when the fault of a wind generator set gearbox is diagnosed, different filtering modes are employed for different algorithms to extract the corresponding characteristic; (5) the collected data is subjected to characteristic extraction; (6) the fault diagnosis is carried out to provide the fact that whether the fault exists or not and the degree of the fault; (7) the residual life of the failed gearbox is estimated through a gray theory model, and an autoregression model is established for the residual error of the predication result to raise the predication precision. According to the method, the real-time estimation of the residual life is realized, and a basis is provided for the planned maintenance of the wind turbine set.
Owner:BEIHANG UNIV +1

Comprehensive performance resting experiment table for precision speed reduction device

The invention discloses a comprehensive performance resting experiment table for a precision speed reduction device. The comprehensive performance resting experiment table comprises main components, such as a servo motor, an input end torque and rotational speed sensor, a high precision encoder, a measured speed reducer, a vibration noise and temperature sensor, an output torque and rotational speed sensor, a magnetic powder brake, and auxiliary components for connecting and fixing, such as a base, a horizontal sliding table, a coupling and a speed reducing mounting base; the comprehensive performance resting experiment table adopts the mode that the magnetic powder brake provides input end load, the input end of the servo motor is loaded, and angle, rotate speed, temperature, vibration and noise testing devices are added in the middle, so as to test the comprehensive performances of the precision speed reduction device. The comprehensive performance resting experiment table can accomplish testing of performances, such as transmission efficiency, torsional rigidity, vibration, noise and temperature rise, on one experiment table, and can test the comprehensive performances of different models of precision speed reduction devices. The comprehensive performance resting experiment table has the advantages of simple structure, high testing precision and high automation degree, and can meet the testing and detection requirements on the comprehensive performances of the precision speed reduction device.
Owner:CENT SOUTH UNIV

Vehicle transmission control mechanism assembly testing bench

ActiveCN101319964AIt has the function of alarming for excessive gear shiftingSwitch freelyVehicle testingMachine gearing/transmission testingControl systemAutomotive transmission
The invention discloses a test-bed for testing the performances and durability of a shift control mechanism assembly of a vehicle which includes a test-bed body; in the test-bed body, an adjustable mounting adjusting framework with six directions is fixedly arranged at the front end; the shift control mechanism assembly of the vehicle is arranged in the mounting adjusting framework; the output end of the shift control mechanism assembly of the vehicle is connected with a gearbox by selecting and exchanging gearshift lines; the control frame of a PLC control system is arranged on a side wall at the back part in the test-bed body; an air cylinder loading system and a load system are arranged above the test-bed body. The assembly of the test-bed has the following advantages of: 1, being capable of simulating the actual operating condition of the shift control mechanism assembly of the vehicle; 2, being capable of simulating the gear shift and selecting motions on the shift control mechanism assembly of the vehicle; 3, dividing the test-bed controlled by the system into a 'manual' operating mode and an 'automatic' operating mode which can freely and mutually switch; 4, having the function of alarming when the time for gear shift is excessive.
Owner:WUHU WANLIYANG TRANSMISSION CO LTD

Dynamic load simulating device and method for automobile power system test

The invention relates to a dynamic load simulating device and a dynamic load simulating method for an automobile power system test, and belongs to the technical field of vehicle power system tests. The dynamic load simulating device comprises a control computer, a dynamometer controller, a frequency converter, an alternating current (AC) power dynamometer and a torque flange with a controller. A virtual automobile model-based control algorithm is adopted, a virtual automobile model is driven by an actual measurement torque, and the simulation of the rolling resistance, wind resistance and the inertia resistance of a vehicle is realized under the conditions of not calculating angular acceleration of the dynamometer. The dynamic load simulating device and the dynamic load simulating method have high stability and high simulation precision, are favorable for shortening the development cycle of an automobile power system and providing convenient test environment for the development of the power system. A process that the vehicle acceleration is acquired by differentiating the rotation speed of the automobile power system is avoided in the calculation process, and a phenomenon that accurate differential values are difficult to acquire due to relatively large noise caused by the process of differentiating the rotation speed is prevented.
Owner:TSINGHUA UNIV

Test method of automobile transmission system efficiency

The invention relates to a test method of automobile transmission system efficiency, which comprises the following steps: a variable frequency and variable speed motor is connected with an automobile transmission system through a revolution speed and torque sensor; two eddy current dynamometers are respectively connected with two half shafts of the automobile transmission system through the revolution speed and torque sensor; a speed variator of the automobile transmission system is positioned at a certain shift; the target rotation speed of the two half shafts under the rotation speed of a certain variable frequency and variable speed motor is determined according to the transmission ratio; the variable frequency and variable speed motor is started, the eddy current dynamometers load the two half shafts respectively so that the two half shafts can reach the target rotation speed, and then the product of the sum of the torque of the two half shafts and the rotation speed of the half shafts is the output power of the automobile transmission system; and the output power and the product of the torque and the rotation speed of the variable frequency and variable speed motor are compared to obtain the transmission efficiency of the automobile transmission system. The test method is simple, and has quick dynamic response and high testing precision.
Owner:CHONGQING CHANGAN AUTOMOBILE CO LTD

Vacuum high/low temperature environmental simulation electromechanical transmission mechanism comprehensive performance experimental system

The invention discloses a vacuum high/low temperature environmental simulation electromechanical transmission mechanism comprehensive performance experimental system, which comprises an experimental platform, a driving assembly, a vacuum high/low temperature experimental assembly, a normal temperature and normal pressure experimental assembly and a loading assembly. The driving assembly comprises a servo motor, an input end torque and speed sensor and an input end angle encoder; the vacuum high/low temperature experimental assembly comprises vacuum high/low temperature environmental simulation equipment, an optical platform, and input and output end magnetic fluid sealing shafts; and the loading assembly comprises an output end angle encoder, an output end torque and speed sensor and a torque motor. The vacuum high/low temperature environmental simulation equipment has low cost, the installation of the driving assembly and the loading assembly is performed outside a vacuum tank, and the installation and debugging are convenient. Due to the adoption of a modular design, the experimental system can test the comprehensive performance of a speed reducer and other rotating mechanisms under the conditions of space environment and normal temperature and normal pressure environment on the same experimental system, and has the advantages of strong adaptability of the equipment and high detection accuracy.
Owner:SICHUAN UNIV +1

Device for detecting comprehensive performance of ball screw assembly in loaded state

InactiveCN103389205ARealize detectionReal-time detection of the number of rotationsMachine gearing/transmission testingCouplingBall screw
A device for detecting comprehensive performance of a ball screw assembly in a loaded state comprises a testboard machine body fixed on a cast iron platform, wherein a servomotor is arranged at one end of the testboard machine body; the output shaft of the servomotor is connected to one end of the ball screw assembly through a first coupler, a dynamic torque sensor and a second coupler; an eddy current sensor and a rotary encoder are arranged at the other end of the testboard machine body; a grating scale and an infrared temperature sensor are arranged on the testboard machine body; a rolling guide rail is arranged on the testboard machine body, and is provided with an analog working table; the analog working table is connected to the rolling guide rail through a rolling guide rail slide block, and is connected to a loading device; a ball screw assembly nut is arranged on the analog working table through a nut support base. The device is stable in properties, quick in movement and testing response speed, comprehensive and accurate in testing performance parameters, and simple in structure, and can realize the comprehensive performance detection of ball screw assemblies with different models in no-loaded states or loaded states.
Owner:XI AN JIAOTONG UNIV

Automobile pedal operating mechanism assembly performance test board

ActiveCN102353544AShorten the development and trial production cycleReduce test costsVehicle testingMachine gearing/transmission testingElectricityControl system
The invention discloses an automobile pedal operating mechanism assembly performance test board which comprises a measuring mechanism, a rotary movement mechanism, a transverse movement mechanism, an elevating movement mechanism, a vertical movement mechanism, a support and a data acquisition control system. The support is erected with the vertical movement mechanism. One side of the vertical movement mechanism is provided with the transverse movement mechanism. A top of the transverse movement mechanism is provided with the elevating movement mechanism. The elevating movement mechanism is fixedly provided with the rotary movement mechanism. A top of the rotary movement mechanism is provided with the measuring mechanism. A force transducer of the measuring mechanism is electrically connected with the data acquisition control system. The test board has four degrees of freedom, and can carry out a plurality of detection needed by a pedal such as stroke detection, pedal force detection, output force characteristic detection, elevating time detection, master cylinder pressure characteristic detection, endurance performance detection, actuator head adjusting detection and the like, an exploitation trial-production period of the automobile pedal is shortened, and the test cost in an exploitation process is saved.
Owner:RES INST OF ZHEJIANG UNIV TAIZHOU
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