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A Vibration Reliability Analysis Method for the Uncertain Space Beam Structure

机译：不确定空间梁结构的振动可靠性分析方法

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摘要

Considering that uncertainty is inherent and unavoidable in engineering practice and the available information about the uncertain parameters is always not sufficient, the paper tries to carry out the nonprobabilistic vibration reliability analysis so as to avoid resonance on uncertain structure with bounded parameters. The input uncertain-but-bounded parameters are treated as interval variables, and an interval model is adopted to describe bounded uncertainties. Then a theory of nonprobabilistic reliability is introduced, in which the dimensionless nonprobabilistic reliability index and system reliability index are defined. In order to investigate the resonance failure with reliability method, the resonance failure domains are stated according to the relationships between the natural frequencies and the excitation frequencies. Then the uncertain structure is modeled as a series system and a system reliability index is proposed to evaluate the safety of the structure. The paper also takes a frequency analysis on the uncertain space beam structure to get the resonance failure modes. A frequency analysis method based on the monotonicity discriminant of the frequency sensitivity is presented. Then an optimization algorithm is introduced to verify the validity of the former frequency analysis method. Two examples are provided to illustrate the effectiveness and feasibility of the presented method.
机译：考虑到不确定性是工程实践中固有和不可避免的，不确定性参数的可用信息总是不够的，本文尝试进行非概率振动可靠性分析，以免不确定性参数在结构上产生共振。输入的不确定但有界的参数被视为区间变量，并采用区间模型来描述有界的不确定性。然后介绍了非概率可靠性理论，定义了无量纲的非概率可靠性指标和系统可靠性指标。为了用可靠性方法研究谐振失效，根据固有频率和激励频率之间的关系来描述谐振失效域。然后将不确定结构建模为一个串联系统，并提出了系统可靠性指标来评估结构的安全性。本文还对不确定的空间梁结构进行了频率分析，以获得共振破坏模式。提出了一种基于频率灵敏度单调判别的频率分析方法。然后引入一种优化算法，以验证前一种频率分析方法的有效性。提供了两个示例来说明所提出方法的有效性和可行性。

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  • 来源
    《Shock and vibration》 |2016年第3期|9218590.1-9218590.14|共14页
  • 作者

    Mo Yanyu; Guo Shuxiang; Tang Cheng;

  • 作者单位

    Air Force Engn Univ, Aeronaut & Astronaut Engn Coll, Xian 710038, Peoples R China;

    Air Force Engn Univ, Coll Sci, Xian 710051, Peoples R China;

    Air Force Engn Univ, Coll Sci, Xian 710051, Peoples R China;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
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