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首页> 外文会议>International Modal Analysis Conference >AN EFFICIENT TECHNIQUE FOR OPTIMAL DESIGN CHANGES TO FEM OF STRUCTURAL DYNAMIC SYSTEMS
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AN EFFICIENT TECHNIQUE FOR OPTIMAL DESIGN CHANGES TO FEM OF STRUCTURAL DYNAMIC SYSTEMS

机译：结构动态系统有限元的最佳设计变化的高效技术

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The primary concern of this work is to improve the efficiency by which optimal design changes can be made to finite element models (FEM) of undamped structural dynamic systems. An optimal design change is one in which there is a minimum change in the design parameters. Because of the very large number of degrees of freedom which normally comprise a practical finite element model, it is generally impractical to conduct an optimization of design changes for prescribed design objectives. This is due to the excessive computer time required for the necessary iterations of the optimizing scheme. To facilitate identification of the optimum design, the optimizing algorithm is applied to a generalized coordinate representation of the FEM by identifying and altering the available design parameters in a manner which is consistent with the imposed design constraints. These constraints are prescribed in terms of eigenvectors and/or eigenvalues of the modified system. Various illustrations of the proposed technique's validity and versatility are presented for a FEM of a flat plate. One important aspect of the work presented here is the generality of the approach, thus permitting the application to any kind of finite element model and to a large variety of design parameters.
机译：这项工作的主要关注点是提高最佳设计改变的效率，可以对无透明的结构动态系统的有限元模型（FEM）进行。最佳设计变化是设计参数的最小变化之一。由于通常包括实用有限元模型的大量自由度，对规定的设计目标进行设计变化的优化通常是不切实际的。这是由于优化方案必要迭代所需的过度计算机时间。为了便于识别最佳设计，通过以与施加的设计约束一致的方式识别和改变可用的设计参数，将优化算法应用于FEM的广义坐标表示。这些约束是根据修饰系统的特征向量和/或特征值规定的。提出了所提出的技术的有效性和多功能性的各种图示，用于平板的FEM。这里呈现的工作的一个重要方面是该方法的一般性，从而允许应用于任何类型的有限元模型和大量的设计参数。

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