吊挂式模态试验系统动力学建模和分析

doi:10.7527/S1000-6893.2018.22191

Abstract

Abstract: According to the working principles of the hanging modal test system, a basic mechanical model for the system is established via reasonable simplification and equivalence. Based on the Rayleigh theory, calculation formulas for correction of the test frequency in both horizontal and vertical directions are given, and the relationship between the test base frequency and true base frequency is revealed. The mechanism, influencing factors and trends of the test base frequency errors in both directions are analyzed. Through the modal test of the standard bar and finite element simulation analysis, the mechanical equivalent model for the hanging modal test system is verified to be reasonable, correct and effective. The results show that the test base frequency of the hanging modal test system in the vertical direction is low and the test base frequency in the horizontal direction is high, and thus the test result errors must be corrected to obtain the accurate base frequency of the measured object.

Key words: hanging modal test system, dynamic analysis, finite element simulation, base frequency, test result error

CLC Number:

V416.2
TB122

WU Song, ZANG Xu, LONG Xinjun, GUO Qiwei. Dynamic modeling and analysis of hanging modal test system[J]. ACTA AERONAUTICAET ASTRONAUTICA SINICA, 2018, 39(S1): 722191-722191.

References

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Dynamic modeling and analysis of hanging modal test system

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