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2907results about "Vibration testing" patented technology

Ground testing system for on-track micro vibration of spacecraft

ActiveCN102650563AImprove the technical level of micro-vibration testMeet test verification requirementsVibration testingVibration measurementEngineering
The invention discloses a ground testing system for on-track micro vibration of a spacecraft, which comprises a vibration isolating foundation, a supporting truss with a framework structure, a suspended positioning platform, a gravity suspended compensation unit, an integrated control subsystem, a micro vibration measurement subsystem and a test data processing and analyzing subsystem, wherein the vibration isolating foundation is connected with the ground, the supporting truss with the framework structure is fixedly supported on the vibration isolating foundation, the suspended positioning platform is supported on the supporting truss, the gravity suspended compensation unit is hung on the suspended positioning platform, and the integrated control subsystem is used for controlling the positioning and the fixation of the suspended positioning platform via coordination of sensors in various positions and performing the overall integrated control on the state of the system. By adopting the system, the ground simulation of the on-track micro vibration environment, the measurement of micro vibration and the data processing can be realized for the spacecraft at the system level and the component level, the technical level of testing the micro vibration of the spacecraft can be improved, and the demands for testing and verification of the on-track micro vibration environment in research on the spacecraft, particularly the high-precision satellite, can be satisfied.
Owner:BEIJING INST OF SPACECRAFT ENVIRONMENT ENG

Method and system used for monitoring vibration states of impellers of wind generating sets

The invention provides a method and system used for monitoring the vibration states of impellers of wind generating sets. The method includes the steps that the vibration acceleration of a predetermined measuring point on a vane of each wind generating set in at least one direction is detected according to a preset detection period, data of operating parameters of at least one of the wind generating sets are synchronously acquired, and the acquired data of the operating parameters of the set and the detected vibration acceleration data are recorded; data sets of recorded operating parameter data and recorded vibration acceleration data exceeding the preset amount are selected; according to the operating parameters of the wind generating sets, vibration acceleration data detected when the wind generating sets are in abnormal working conditions are removed from the data sets; operating mode analysis is carried out on the vibration acceleration data detected at the measuring points of the vanes, at least one of the inherent frequency, the damping ratio and the vibration mode of each vane in the operating state is extracted, and whether the impellers of the wind generating sets break down or not are determined according to the extracted inherent frequency, damping ratio and vibration mode.
Owner:BEIJING GOLDWIND SCI & CREATION WINDPOWER EQUIP CO LTD

High g value impact acceleration simulation test system and method , test method and application

InactiveCN101458152ASimple designLeading technical performanceVibration testingInertial measurement unitCushion
In the invention, a high g value impact acceleration simulation test system, a method thereof and the application of the test method, belonging to the technical fields of impact testing and tests. The test system comprises three parts: the high g value impact acceleration simulation test system, the test method and the application of the test method. In the high g value impact acceleration simulation test system and the test method, an impact acceleration signal with the amplitude of (0.1-1.5)*10<5>g and impulse width of 150-600mus is generated by the collision of a projectile shot by a gas cannon and a collided object, thus providing the test system and the test method for various performance researches on a projectile-borne electronic instrument under high impact environment. The test system and the test method have advanced designs and leading technical performances, can be applied to the aspects of projectile-borne testing instrument, inertial measurement unit, black box, intelligent fuze, gyro, MEMS device and the like for the calibration of an acceleration storage testing device under application environment, high impact resisting performance research of the projectile-borne electronic instrument, cushion performance research of a cushion part of a projectile-borne testing device and return-to-zero characteristic research of a high impact accelerometer.
Owner:ZHONGBEI UNIV

Thin-walled structure part vibration test device and method based on piezoelectric ceramic vibration exciter

The invention belongs to the technical field of vibration test, in particular to a thin-walled structure part vibration test device and a method based on a piezoelectric ceramic vibration exciter. The device comprises a signal generator, a piezoelectric ceramic drive power supply, a piezoelectric ceramic vibration exciter, a feedback attenuator, a laser vibration meter, a data acquisition analyzer and an upper computer. The method comprises the steps of performing modality test on a thin-walled structure part, determining a linear relationship between excitation voltage and critical excitation frequency of the signal generator and calibrating an excitation force of the piezoelectric ceramic vibration exciter based on a cantilever theory. According to the device and the method, an excitation signal can be effectively acquired; the magnitude of the excitation force when the piezoelectric ceramic vibration exciter excites the structure part is defined; the stable designated excitation force and the linear excitation signal of the excitation frequency can be generated; influencing factors of non-linear piezoelectric ceramic excitation are effectively eliminated; the piezoelectric ceramic vibration exciter is adopted to realize high-frequency vibration excitation; additional mass is low; and the device is convenient to use.
Owner:NORTHEASTERN UNIV

Marine riser vibration characteristic simulation test device under deepwater well drilling working condition and test method

ActiveCN103292970ASimulate vibration characteristicsThe vibration characteristics are real and effectiveHydrodynamic testingVibration testingReal-time dataWell drilling
The invention discloses a marine riser vibration characteristic simulation test device under a deepwater well drilling working condition. The marine riser vibration characteristic simulation test device comprises a pool (1) and a trailer (2), wherein a lifting device A (3) is arranged on a horizontal sliding rail (8) of the trailer (2), a marine riser model (5) is connected with a connector A (9) at the bottom of the lifting device A (3) and a connector B (10) at the bottom of a lifting device B (4), the connector A (9) is communicated with a container (6), the connector B (10) is communicated with a liquid pump (7), and a tension adjusting device (33) is further arranged on the marine riser model (5). The invention further discloses a test method of the device. The marine riser vibration characteristic simulation test device has the advantages of being capable of simulating vibration performance of a marine riser of deepwater well drilling under different working conditions, suitable for marine riser models with different lengths, capable of simulating influence of different types of tensile force, different well drilling fluid density, different drilling fluid viscosity, different well drilling discharge capacity and different well drilling rotating speeds on vibration characteristics of the marine riser models, and capable of accurately obtaining real-time data in the test process.
Owner:SOUTHWEST PETROLEUM 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
The invention discloses an analysis method for testing the fatigue life of components based on vibration signals. The analysis method comprises the following steps that (1) a power spectral density function Ga (f) of working field random vibration acceleration load of the components is calculated according to the acquired random vibration acceleration load time domain signals xa(t) of the components; (2) a stress frequency response function HS(f) under the unit acceleration (1g) load of the components is solved by utilizing finite element harmonic response analysis; and a stress power spectral density function of the structure is acquired through combination of (1) based on the working field random vibration acceleration load of the components; and (3) a stress load distribution probability density function of the components is solved according to a Dirlik method by utilizing the working field random vibration acceleration load power spectral density of the components, and a random vibration fatigue analysis load spectrum is established to perform random vibration fatigue analysis on the components. The problem that stress amplitude information of the components working in the complex working conditions is difficult to obtain directly and fatigue life pre-estimation cannot be performed can be solved.
Owner:QINGDAO R & D INST XIAN JIAOTONG UNIV

Test bench of comprehensive performance of air spring

The invention discloses a test bench of the comprehensive performance of an air spring, and belongs to the technical field of vehicle engineering. The test bench can effectively achieve the aims of carrying out the vertical, transverse and twisting tests of the air spring at the same time and simulating the actual working states of the air spring. A rack of the test bench is in a four stand column type, a bearing platform is arranged in the middle of the rack, a device for bearing balance weight is arranged above the rack, a sensor is arranged below the rack, each stand column of the rack is provided with a cone-shaped fixing nut, a vertical hydraulic actuator which is arranged in a plane triangle mode is arranged below a workbench, and the volume of an additional air chamber is adjustable. The influence to the dynamics performance of the air spring by regional environment with different temperatures can be simulated by an external air conditioner system, multi-dimensional simulation is applied to the air spring through a shock excitation source, changes of loads and deflection of the air spring under the conditions with different environment temperatures and physical parameters are measured, and parameters such as dynamic stiffness, static stiffness, damping ratio and transfer ratio of the air spring are calculated through parameters of vibration characteristics. The test bench is mainly used for testing the comprehensive performance of the air spring.
Owner:CRRC QINGDAO SIFANG CO LTD

Method and device for testing dynamic stiffness of vibration isolator

InactiveCN103808499ASolve clumsySolve the test costMachine part testingVibration testingDynamic stiffnessHigh rate
The invention discloses a method and a device for testing dynamic stiffness of a vibration isolator. The method comprises the steps of establishing an equivalent test model of a single-degree-of-freedom vibration system in a vibration isolation direction by using a static loading device, a combined vibration mass block and an elastic simply supported beam, measuring a frequency response function of the equivalent test model by an exciting method, and then indirectly obtaining the dynamic stiffness of the vibration isolator by virtue of a vibration equation, the similarity of the vibration system and the characteristics of the single-degree-of-freedom system. The method avoids the problem that the existing methods all need to simulate a rated load or a working load with an equivalent mass block in an ingenious way, and solves the problem that the test system is clumsy, high in test cost and test difficulty and even unachievable if the mass block is used for simulating high rated load or working load; the testing device is light and simple in structure, convenient to operate, and economical and practical; the method and the device are applicable to the dynamic stiffness tests of all single-axis vibration isolators, high in applicability, and especially capable of realizing testing of the dynamic stiffness of a large-rated load vibration isolator and ensuring high precision.
Owner:JIANGSU UNIV OF SCI & TECH

Rolling bearing performance degradation evaluation device and method

The invention provides a rolling bearing performance degradation evaluation device and method. The device comprises an acceleration sensor, a data acquisition module, a feature extraction module, an SVDD evaluation module and a verification module. According to the method, the acceleration sensor is made to be used for acquiring vibration signals of a bearing to be measured and converting the vibration signals to simulation signals; the data acquisition module is made to be used for conducting amplifying, smoothing and other processing on the simulation signals, converting the simulation signals into digital signals and then transmitting the digital signals to a computer; the feature extraction module is used for extracting wavelet packet singular spectrum entropies of the vibration signals to serve as input feature vectors so as to be used for the SVDD evaluation module; The SVDD evaluation module is used for establishing a self-adaption SVDD model and evaluates the performance degradation process of the rolling bearing through the self-adaption SVDD module to obtain a performance degradation index DI; the verification module verifies the correctness of the evaluation result through an Hilbert envelope demodulation method based on EMD. The rolling bearing performance degradation evaluation device and method are applied to performance degradation evaluation of the rolling bearing in the whole life cycle.
Owner:EAST CHINA JIAOTONG UNIVERSITY

Method and device for measuring low-frequency and small-range vibration signals

The invention provides a method and device for measuring low-frequency and small-range vibration signals. The method mainly comprises the steps that an acceleration sensor is arranged on a measured object; after the low-frequency and small-range vibration signals sent by the measured object are detected by the acceleration sensor, the low-frequency and small-range vibration signals are converted to vibration acceleration signals; the integration-amplification vibration acceleration signals are output, and the resonant frequency of an integration-amplification acceleration sensor is larger that the largest effective vibration frequency of the vibration signals sent by the measured object; primary integration amplification is conducted on the vibration acceleration signals output by the integration-amplification acceleration sensor so that vibration speed signals can be obtained, and secondary integration amplification is conducted on the integration-amplification vibration speed signals so that vibration displacement signals can be obtained. According to the method and device for measuring the low-frequency and small-range vibration signals, the problem of the failure of the measured signals due to the phenomena of mechanical fatigue and blocking of mechanical components and the like is effectively solved, the resonant frequency of the acceleration sensor is far higher than the largest effective vibration frequency of the measured objects such as the structure of a water-turbine generator set, resonance signals of the acceleration sensor are completely filtered, and the function that a rear-end circuit is not influenced by the resonance signals of the acceleration sensor is guaranteed.
Owner:北京中元瑞讯科技有限公司

Ship propulsion shafting longitudinal vibration simulation test bench

The invention discloses a test bed for simulating longitudinal vibration of a marine propulsion shafting. The test bed comprises a movable loading module (1), a base (12), a fixed loading module (3), a transmission shaft (4), a split coupling (6), a thrust bearing (7), an elastic coupling (8), a gearbox (10) and a frequency conversion motor (11). The fixed loading module (3), the transmission shaft (4), the split coupling (6), the thrust bearing (7), the elastic coupling (8), the gearbox (10) and the frequency conversion motor (11) are arranged on the base (12) in turn. The movable loading module (1) is connected with the fixed loading module (3) through an ejector rod (2) and used for supplying longitudinal alternating exciting force for simulating a propeller. The fixed loading module (3) is connected with one end of the transmission shaft (4). The other end of the transmission shaft (4) is connected with a thrust shaft of the thrust bearing (7) through the split coupling (6). The other end of the thrust shaft is connected with the output shaft of the gearbox (10) through the elastic coupling (8). The gearbox (10) is connected to the frequency conversion motor (11). The test beddisclosed by the invention has the advantages of compact structure, convenient operation, safety and reliability and can satisfy practical application requirements for teaching and researching.
Owner:HUAZHONG UNIV OF SCI & TECH +1

Reliability test platform for frame and traction transmission system of bogie of bullet train

The invention discloses a reliability test platform for a frame and a traction transmission system of a bogie of a bullet train. The platform comprises a mechanical assembly part, a test platform base and a hydraulic pump station, wherein the test platform base consists of a concrete base of a rectangular pit, and a No.1 counterforce seat base platform, a No.2 counterforce seat base platform, a large-range adjustable platform, a base pit platform, a driving device base platform and a No.3 counterforce seat base platform which are poured in the concrete base and are positioned in the same horizontal plane; the mechanism assembly part comprises loading devices, an excitation system assembly and a semi-vehicle quality simulation device; the loading devices are fixed on the driving device base platform and the large-range adjustable platform; the excitation system assembly is provided with four vertical actuators and two horizontal excitation assemblies; the bottom ends of the four vertical actuators are fixedly connected with the base pit platform; one end of one horizontal excitation assembly and one end of the other horizontal excitation assembly are fixedly connected with the large-range adjustable platform and the No.3 counterforce seat base platform; and the bottom end of the semi-vehicle quality simulation device is fixed on the test platform base.
Owner:JILIN UNIV

Accelerated life test method of aircraft brake system

The invention relates to an accelerated life test method of an aircraft brake system. The environment conditions of applying temperature stress, vibration stress and the like in a combined way are adopted, the operating conditions are added and the operating frequency of the whole system are increased during the test process, so that the hidden fault dangers of the brake system are stimulated, and the test time is shortened. The method is circularly carried out according to the test profile during the test process until the required reliability index is reached. The power-on operating conditions, the brake applying pressure operating conditions and the rotating speed change conditions in use are converted into the test time according to the applied operating frequency, and the operating frequency adopted in the test is greater than the actual operating frequency in use. The reached reliability index is assessed according to the method in GJB1407 and recommended degree of confidence after the test is finished, and the degree of confidence for assessing the reliability index is 90%; and the empirical coefficient of life assessment is 1.5. The purpose of performing the accelerated life test on the brake system is realized by verifying whether the brake system has hidden fault dangers under various operating states.
Owner:XIAN AVIATION BRAKE TECH

System and method for testing and analyzing automobile vibration

The invention discloses a system and a method for testing analyzing automobile vibration, comprising a three-direction acceleration sensor, a single-direction acceleration sensor, a signal regulating module, a radio data collecting card and a monitoring computer. The three-direction acceleration sensor and the single-direction acceleration sensor are arranged on a key part during the running of the automobile and are used for respectively obtaining and outputting the vibrating signals of each key part during the running of the automobile; the signal regulating module is connected with the output ends of the three-direction acceleration sensor and the single-direction acceleration sensor and used for regulating and outputting the signals output by the three-direction acceleration sensor and the single-direction acceleration sensor; the radio data collecting card is connected with the signal regulating module and used for collecting and wirelessly outputting the regulated signals of the signal regulating module; the monitoring computer is provided with a radio data receiving end and is used for receiving the radio signals output by the radio data collecting card as well as testing and analyzing the vibration signals during the running of the automobile. The device has simple hardware structure, realizes the diagnosing and analyzing function by software, facilitates the upgrading and maintenance, and is conveniently carried.
Owner:SHANGHAI SECOND POLYTECHNIC UNIVERSITY
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