Error analysis for fundamental frequency measurement of a suspended modal test system
WU Song1,2,GUO Qiwei1,2,ZANG Xu1， XU Teng1
1.Shanghai Aerospace Systems Engineering Research Institute, Shanghai 201109, China；
2.Shanghai Key Lab of Space Structure Institutions, Shanghai 201108, China
Abstract：For a suspended ultra-low frequency modal test system, its theoretical calculation models in vertical direction and horizontal one were established, respectively and Rayleigh method was used to solve fundamental frequencies of the system in both vertical and horizontal directions.The equivalent relationship expression between fundamental frequency test values and the true ones was built.Mechanism causing error, influencing factors and variation trend of fundamental frequency measurement in both directions were analyzed.The results showed that the system’s fundamental frequency test value in vertical direction is on the low side and that in horizontal direction is on the high side; the method and procedure to calculate the true fundamental frequency of products are proposed using their fundamental frequency test values; the correctness and effectiveness of the equivalent theoretical calculation models in both vertical and horizontal directions are verified with a standard bar’s fundamental frequency test and finite element simulation analysis.
吴松1,2，郭其威1,2，臧旭1，徐腾1. 悬吊式模态试验系统基频测试误差分析[J]. 振动与冲击, 2018, 37(19): 74-78.
WU Song1,2,GUO Qiwei1,2,ZANG Xu1， XU Teng1. Error analysis for fundamental frequency measurement of a suspended modal test system. JOURNAL OF VIBRATION AND SHOCK, 2018, 37(19): 74-78.
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