SECANT-METHOD ADJUSTMENT FOR STRUCTURAL MODELS
SECANT-METHOD ADJUSTMENT FOR STRUCTURAL MODELS
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DOI：
10.2514/3.10553
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发表时间：
1989-04
期刊：
影响因子：
2.5
通讯作者：
S. Smith;C. Beattie
中科院分区：
文献类型：
--
作者：
S. Smith;C. Beattie
对大型空间结构的任何数学模型进行最终调整和验证都需要在轨测试。利用有限的响应数据产生最优调整的特性矩阵的识别方法似乎是理想的，但在将先前发表的方法应用于大型空间桁架结构方面存在困难。本文提出了一种新的刚度矩阵平差方法，它将拟牛顿方法中的最优更新割线法推广到非线性优化中。以前发表的刚度矩阵调整方法的许多方面可以在割线方法的新框架内得到更好的理解。其中一种新方法以最小的存储要求和计算工作量保持了实际的结构连通性。介绍了一种对测量数据误差进行系统补偿的方法，同时保持了结构的连通性。提出了两个演示，将新方法的结果与先前发表的技术进行比较。
On-orbit testing will be required for final tuning and validation of any mathematical model of large space structures. Identification methods using limited response data to produce optimally adjusted property matrices seem ideal for this purpose, but difficulties exist in the application of previously published methods to large space truss structures. This article presents new stiffness matrix adjustment methods that generalize optimal-update secant methods found in quasi-Newton approaches for nonlinear optimization. Many aspects of previously published methods of stiffness matrix adjustment may be better understood within this new framework of secant methods. One of the new methods preserves realistic structural connectivity with minimal storage requirements and computational effort. A method for systematic compensation for errors in measured data is introduced that also preserves structural connectivity. Two demonstrations are presented to compare the new methods' results to those of previously published techniques.