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The study of spacecraft finite element model updating system

机译:航天器有限元模型更新系统的研究

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with the development of finite element technology,finite element model is becoming to the main analysis tool.However,because some theoretic assumptions,unsuitable constraint and uncertain material property are applied,the simulation result of finite element model isn't different from the testing data.In order to improve the design quality and safety of spacecraft,this paper deduced the formula of spacecraft finite element updating,developed the spacecraft finite element model updating system,the software mainly of five parts:the frequency response function calculation,the loading inverse solution,the finite element model updating,the data display,virtual experimentation.Software can complete exciting force inverse,parameter sensitivity analysis,parameters screening and finite element model updating.The calculation result of updated finite element model is in accordance with testing curve shape on the main vibration direction,first-order frequency error is ±5%,response error is ±10%.Software meet the need of finite element model updating,it provide a software base for spacecraft design.
机译:随着有限元技术的发展,有限元模型正成为主要的分析工具。然而,由于一些理论假设,不合适的约束和不确定的材料性能,有限元模型的仿真结果与测试数据没有什么不同。为了提高航天器的设计质量和安全性,推导了航天器有限元更新公式,开发了航天器有限元模型更新系统,该软件主要由五部分组成:频率响应函数计算,载荷反求,有限元模型更新,数据显示,虚拟实验。软件可以完成激振力反演,参数灵敏度分析,参数筛选和有限元模型更新。更新后的有限元模型的计算结果与试验曲线的形状一致。主振动方向,一阶频率误差为±5%,响应误差为±10%。该软件满足有限元模型更新的需要,为航天器设计提供了软件基础。

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