Rigid body mode testing method for powertrain mounting system under loading condition

Abstract

The invention discloses a rigid body mode testing method for a powertrain mounting system under the loading condition. In the method, a heavy object is hung on a powertrain mounting device under the loading condition; and a rope for hanging the heavy object is cut to suddenly release the force acted on the powertrain mounting device so as to excite the free vibration of the powertrain mounting device and immediately trigger a data acquisition unit to record and store the data on a vibration transducer at the moment. A rigid body mode of the mounting system is tested by the method and the obtained each-order natural frequency and decoupling rate are the actual and real natural frequency and decoupling rate of a tested vehicle, so that the method tests the performance of the vehicle most directly, really and reliably. The testing method can be performed on any entire vehicle, only a proper number of heavy objects is needed, and the design and processing of a test bench are avoided, so that the testing cost is basically avoided. Obviously, the testing time and the testing cost are greatly saved.

Description

technical field [0001] The invention relates to the field of automobile loading performance testing, in particular to a rigid body mode testing method of a power assembly suspension system under loading conditions. Background technique [0002] The main function of the powertrain mount system is to achieve two-way vibration isolation between the powertrain and the body. And its vibration isolation performance mainly depends on the vibration decoupling design and frequency shifting design of the suspension system (that is, the reasonable allocation of natural frequencies). [0003] At present, these two are usually designed and verified through theoretical and simulation calculations. The actual performance under actual loading conditions and the calculation results are affected by factors such as approximation errors, suspension component manufacturing errors, and installation errors. Often there are considerable differences. [0004] The mode shape of the system can be ob...

AI Technical Summary

Problems solved by technology

While the exciter or hammer provides a point force, excessive force may cause damage to the powertrain

In addition, the arrangement of the exciter or the operating space of the hammer is also strictly limited by the space in the engine compartment

Therefore, the commonly used modal test methods using exciters or hammers are difficult to implement under loading conditions. So far, there is no very effective test method

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