Harmonic response analysis of virtual vibration test fixture based on large mass method
LIU Yanxin^1,2, LI Tianyu², XUE Tao³, ZHOU Zhiwei¹, LIU Yue¹
1. Experimental Technology Laboratory of Zhengzhou Aircraft Equipment Co., Ltd., Zhengzhou 450005, China;
2. Shanghai Aerospace Electronics Technology Institute, Shanghai 201108, China;
3. Military Representative Office of the Air Force Armament Department in Zhengzhou Region, Zhengzhou 450005, China
Abstract: Aiming at the problem of virtual swept sine test of vibration fixture for airborne suspension launcher，based on the large mass method and combined with the test，the structural dynamic characteristics were studied through the ANSYS simulation platform and the vibration theory. Firstly, the mathematical model of shaking table was deduced, and the virtual test platform was constructed. Then the response characteristics of the vibration fixture was obtained through the virtual sine sweep test. Finally, the confidence was evaluated by physical test. The results show that the virtual vibration test model based on the large mass method is correct and effective, and the results of structural harmonic response analysis using the modal superposition method have high confidence; on the typical points of the vibration fixture, the error of the first two natural frequencies of the vibration fixture obtained by simulation relative to the measured value is about 7.24%, and the variation trend of the frequency response function of the vibration fixture is basically consistent with the test results. The results can meet the accuracy requirements in engineering practice, and can provide reference for the design of vibration fixture and virtual test research of airborne suspension launcher.
Keywords: airborne suspension device;vibration fixture;virtual test;large mass method;swept sine test
2023, 49(9):146-153  收稿日期: 2021-10-25;收到修改稿日期: 2022-01-22
基金项目:
作者简介: 刘艳欣（1991-），男，河南平顶山市人，工程师，硕士，研究方向为机载悬挂装置虚拟振动试验技术
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