[1]张鹏,费庆国,吴邵庆,等.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.[doi:10.3969/j.issn.1001-0505.2017.02.022]
 Zhang Peng,Fei Qingguo,Wu Shaoqing,et al.Equivalence method of pressure load and foundation excitation based on mode superposition technique[J].Journal of Southeast University (Natural Science Edition),2017,47(2):331-336.[doi:10.3969/j.issn.1001-0505.2017.02.022]
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基于模态叠加法的面压载荷与基础激励等效方法()
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《东南大学学报(自然科学版)》[ISSN:1001-0505/CN:32-1178/N]

卷:
47
期数:
2017年第2期
页码:
331-336
栏目:
机械工程
出版日期:
2017-03-20

文章信息/Info

Title:
Equivalence method of pressure load and foundation excitation based on mode superposition technique
作者:
张鹏费庆国吴邵庆李彦斌
东南大学土木工程学院, 南京 210096
Author(s):
Zhang Peng Fei Qingguo Wu Shaoqing Li Yanbin
School of Civil Engineering, Southeast University, Nanjing 210096, China
关键词:
面压载荷 基础激励 载荷等效 替代试验 模态叠加法
Keywords:
pressure load foundation excitation load equivalence alternative test mode superposition method
分类号:
TH113
DOI:
10.3969/j.issn.1001-0505.2017.02.022
摘要:
基于模态叠加法,将随机面压载荷等效为随机基础激励,为薄壁构件的振动台试验替代成本较高的噪声试验提供依据.该方法要求等效前后2种载荷作用下主模态位移一致,将单源载荷等效这一超静定问题合理简化为静定问题.以炭/炭复合材料悬臂板为研究对象,来验证载荷等效方法的有效性.分析结果显示,在随机面压载荷及等效随机基础激励作用下,板上典型部位随机正应力响应的功率谱密度高度吻合,在分析频段内危险点处x轴向正应力响应均方根分析误差低于1%,分布在板上的5个响应点处x轴向正应力响应均方根分析误差低于2%.该方法能有效地将随机面压载荷等效为基础激励,保证等效前后2种载荷作用下薄壁构件的随机动应力响应在频域及空间域上的分布一致性.
Abstract:
The random pressure load is equivalent to the random foundation excitation based on the modal superposition 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.

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备注/Memo

备注/Memo:
收稿日期: 2016-08-08.
作者简介: 张鹏(1987—),男,博士生;费庆国(联系人),男,博士,教授,博士生导师,qgFei@seu.edu.cn.
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).
引用本文: 张鹏,费庆国,吴邵庆,等. 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. DOI:10.3969/j.issn.1001-0505.2017.02.022.
更新日期/Last Update: 2017-03-20