东南大学学报（自然科学版）2017，Vol.47Issue(2)：331-336,6.DOI:10.3969/j.issn.1001-0505.2017.02.022
基于模态叠加法的面压载荷与基础激励等效方法
Equivalence method of pressure load and foundation excitation based on mode superposition technique
摘要
Abstract
The random pressure load is equivalent to the random foundation excitation based on the modal superposifion method to provide evidence for the replacement of the expensive acoustic tests with the shaking table tests for thin-walled structures.The displacement of the leading modes under the two loads are required to be identical.The statically indeterminate problem of the single source load equivalence is properly simplified to a determinate problem.A carbon/carbon (C/C) composite cantilever plate is used as a research subject to investigate the validity of the load equivalence method.The results show that the power spectral density of the random stress responses at typical points of the plate under the random pressure load agrees well with that under the equivalent random foundation excitation.In the analysis of frequency band,the error of the root-mean-square (RMS) of the x-axial normal stress response at the high-risk point on the plate is less than 1％,and the errors of the RMSs of the x-axial normal stress responses at five points distributed on the plate are less than 2％.By using the proposed method,the random pressure load can be effectively equivalent to the foundation excitation,ensuring the consistency of the random stress responses on the thin-walled structures in both the frequency domain and the spacial domain when the structures are subjected to the two loads.关键词
面压载荷/基础激励/载荷等效/替代试验/模态叠加法Key words
pressure load/foundation excitation/load equivalence/alternative test/mode superposition method分类
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张鹏,费庆国,吴邵庆,李彦斌..基于模态叠加法的面压载荷与基础激励等效方法[J].东南大学学报（自然科学版）,2017,47(2):331-336,6.基金项目
国家自然科学基金资助项目(11402052,11572086)、教育部新世纪优秀人才支持计划资助项目(NCET-11-0086)、江苏省自然科学基金资助项目(BK20140616). （11402052,11572086）
