| 李建宏宇,庞贺伟.基于二级近似的航天器结构的模型修正方法[J].装备环境工程,2018,15(11):44-48. LI Jian-hong-yu,PANG He-wei.Model Updating of Spacecraft Structure Based on Two-level Approximate Function[J].Equipment Environmental Engineering,2018,15(11):44-48. |
| 基于二级近似的航天器结构的模型修正方法 |
| Model Updating of Spacecraft Structure Based on Two-level Approximate Function |
| 投稿时间：2018-08-22 修订日期：2018-11-25 |
| DOI：10.7643/ issn.1672-9242.2018.11.008 |
| 中文关键词: 模型修正 频率响应 敏度分析 近似计算 多重优化 |
| 英文关键词:model updating frequency response sensitivity analysis approximate calculation multiple optimization |
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| 中文摘要: |
| 目的 基于航天器结构自由度数大且结构复杂，直接对有限元模型修正计算效率低的问题，利用二级近似方法来提高有限元模型修正的计算效率。方法 根据特征向量建立Ritz空间推导出频率响应及其敏度的一级近似计算公式，利用近似函数二级近似计算结构参数变化后的动刚度矩阵，通过多重优化流程消除近似计算引入的误差。结果 通过两个数值算例进行验证，该方法提高了结构模型修正的计算效率。结论 该方法适用于航天器结构的模型修正。 |
| 英文摘要: |
| Objective To improve the computational efficiency of model updating with two-level approximation method based on large-scale degrees of freedom and the complexity of the spacecraft structure. Methods The first-level approximate calculation formula for frequency response and its sensitivity was derived with Ritz space based on eigenvectors. The dynamic stiffness matrix after structural parameter changes was calculated by approximation function. The errors caused by approximate calculation were eliminated by multiple optimization. Results The method improved the computational efficiency of model updating by two numerical examples. Conclusion The method is suitable for model updating of spacecraft structure. |
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