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弹性薄板结构的等效激励谱反演问题研究
Research on Inversion Technique of Equivalent Excitations of Flexible Panel Structures
投稿时间:2017-03-01  修订日期:2017-04-15
DOI:
中文关键词:  激励谱  反演  等效激励  板壳结构  主要影响模态
英文关键词:Excitation spectrum  Inversion  Equivalent excitation  Plate and shell structures  Master modals
基金项目:
作者单位E-mail
王伟科 山东大学机械工程学院 449200779@qq.com 
霍睿 山东大学机械工程学院 huorui@sdu.edu.cn 
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中文摘要:
      在声纳基阵腔内机械自噪声预报问题的研究中,确定平台区激励一直是个难题,考虑到振源设备激励向声纳部位传播过程的复杂性,通过测量平台区振动响应对其外部激励情况进行估算是最具可行性的一种方法。本文根据弹性薄板结构的振动模态理论和简支边矩形薄板的Navier解法,详细探讨了在外部激励的分布状态未知或难以确定的情况下,基于响应相似原则进行“等效激励”虚拟假设,利用实测板壳结构振动响应和模态参数对等效激励进行反演计算的一般原理方法,分别用解析法和有限元法对等效激励估计实验方案设计中影响结果可靠性的主要因素进行了分析论证。结果表明等效激励法是一种适用于激励作用位置缺失情况的可靠的、便于工程应用的环境激励反演评估方法。
英文摘要:
      Detection of sonar platform excitations has been a formidable obstacle towards the estimation and evaluation of mechanical self-noise in the sonar cavity. In view of the complexity oftransmission of excitations from mechanical vibration equipments to sonar platform, an inversion technique, i.e., indirectly estimating the outside excitations by means of measurement of vibratory responses, would be the most applicable and feasible. An equivalent excitation method is proposed in this paper, by the hypothesis that responses resulted from equivalent excitations would be equal to that from actual excitations, to deal with the excitation inverse problem in situations where there is no knowing about the location and distribution of dynamic excitation forces acting on structures. Influential factors in estimation of equivalent excitations are well reasoned based on modal theory of panel structures, with both analytical analysis and FEM numerical simulation method. And it could be concluded that the equivalent excitation inversion would be a practical method for evaluation of environmental excitations.
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