Abstract:To solve the problem in the notch filter design of unmanned air vehicle caused by fuel tank sloshing frequency closed to rigid body frequency and time-varying as fuel dissipates, minimal ratio of liquid width to depth baffles with "#" profile were designed to suppress sloshing. Transverse step excitation on the fuel tank was exerted by vibration table with sliding table. Free decaying vibration response of the fuel was acquired by laser Doppler vibrometer. Sloshing frequency and damping were identified by Analytical Mode Decomposition and FREEVIB method based on Hilbert Transform. The sloshing fundamental frequency of the fuel tank with minimal ratio of liquid width to depth "#" baffles was much higher than that with sparse baffles, and wasn't varied with the depth of the fuel. The sloshing damping with "#" baffles was also much higher, resulted in the sloshing response decayed very quickly.
李海东1,李龙1,侯凯宇2,史晓鸣1,夏鹏1,高阳1. 基于解析模态分解的极小宽深比液体晃动非线性参数辨识及试验方法[J]. 振动与冲击, 2022, 41(8): 188-192.
LI Haidong1,LI Long1,HOU Kaiyu2,SHI Xiaoming1,XIA Peng1,GAO Yang1. An nonlinear parametric identification and test method for minimal ratio of width to depth liquid sloshing based on analytical modal decomposition. JOURNAL OF VIBRATION AND SHOCK, 2022, 41(8): 188-192.
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