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《Noise and Vibration Control》 2017-01
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Modal Density Measurement Test Based on Point Admittance Method

CHEN Fei;DONG E-liang;Department of Engineering Mechanics, Southeast University;Key Laboratory of Engineering Mechanics of Jiangsu Province;  
Modal density is an important parameter in statistical energy analysis method when analyzing dynamic response in medium and high frequency bands. It can indicate the storage capacity of vibration energy of structural systems.Modal density can be obtained experimentally using point admittance method. In this paper, the point admittance method is used to test the modal density of a rectangle aluminum alloy plate. Impulse hammer excitation and sinusoidal sweeping excitation are used respectively to get the results. The test results are modified by considering the additive masses of the sensors. Experimental results show that different excitations have different influences on the accuracy of test results; the influences of the additive masses on the corrected results are different under different excitations but the same frequency.The test result under the sinusoidal sweeping excitation agrees well with theoretical value after the additive mass correction.
【Fund】: 教育部新世纪优秀人才支持计划资助项目(NCET-11-0086);; 国家自然科学基金资助项目(10902024);; 江苏省普通高校研究生科研创新计划资助项目(CXZZ13_0084);; 航空科学基金资助项目(20090869009)
【CateGory Index】: TB53
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