航天舱段结构振动环境预示方法研究

发布时间：2018-12-31 22:16

【摘要】：力学环境是航空航天产品设计中的重要组成部分。本文从有限元分析和统计能量分析两个方面对复杂舱段结构的力学环境预示方法进行研究,具有重要的工程应用价值。本文的主要工作如下:首先,基于商用软件MSC.Patran和Nastran,对某舱段结构进行有限元分析。建立并简化有限元模型,采用加速度激励作频域分析。根据实验数据,对比关键部位传递函数,对模型的响应预报做出评价和确认,并以此基础上对模型进行修正,为进一步应用提供精确可信的有限元模型。其次,采用统计能量分析计算结构在高频段的响应。使用商用软件Auto SEA2建立某舱段结构的SEA模型,讨论并确定各子系统的内损耗因子、耦合损耗因子、模态密度。使用商用软件Auto SEA2进行高频段响应预示。研究表明,统计能量法能有效弥补有限元方法在高频段的计算缺陷。通过有限元分析与统计能量分析,本文完成对复杂舱段结构全频域内的振动环境预示。为复杂结构的虚拟振动环境试验技术的发展提供一定的参考意义。
[Abstract]:Mechanical environment is an important part of aerospace product design. In this paper, finite element analysis and statistical energy analysis are used to study the prediction method of mechanical environment of complex cabin structure, which has important engineering application value. The main work of this paper is as follows: firstly, finite element analysis of a cabin structure is carried out based on commercial software MSC.Patran and Nastran,. The finite element model is established and simplified, and the acceleration excitation is used for frequency domain analysis. According to the experimental data, the response prediction of the model is evaluated and confirmed by comparing the transfer function of the key position, and the model is modified on the basis of the model, which provides an accurate and credible finite element model for further application. Secondly, the response of the structure in high frequency band is calculated by statistical energy analysis. The commercial software Auto SEA2 is used to establish the SEA model of a cabin structure, and the internal loss factor, coupling loss factor and modal density of each subsystem are discussed and determined. Commercial software Auto SEA2 is used to predict high frequency response. The results show that the statistical energy method can effectively compensate for the defect of finite element method in high frequency band. Through finite element analysis and statistical energy analysis, the vibration environment of complex cabin structure in full frequency domain is predicted in this paper. It provides a certain reference for the development of virtual vibration environment test technology of complex structures.
【学位授予单位】：南京航空航天大学
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：V414

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