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Development of Full Space System Model Modes from Expansion of Reduced Order Component Modal Information

机译：从减少顺序组件模态信息扩展的全空间系统模型模式的开发

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Model reduction is a technique commonly used to reduce the computation time of structural dynamic models. The results of the reduced model can then be expanded to full space using the transformation matrix developed in the reduction process. This work focuses on expanding the mode shapes of system models that are comprised of reduced component models. Typically, this expansion requires the full space system model to be computed in order to obtain the system model transformation matrix needed to perform the expansion. Computing the full space system model to determine the expansion matrix does not save computation time and therefore defeats the purpose of using model reduction. This paper proposes using the expansion matrices of the individual components to expand the assembled system model modes. In this work, System Equivalent Reduction Expansion Process (SEREP) is used for reduction and expansion. The accuracy of the expanded system model is shown to be dependent on the modes retained in the reduced component models. Recent work on Variability Improvement of Key Inaccurate Node Groups (VIKING) has shown that over specifying the number of modes used in the reduction/expansion process that span the space of the system model modes significantly improves the results. The VIKING technique is the basis for the expansion process developed in this work. Multiple analytical cases are presented to show how the selection of component modes affects the expansion results. The analytical cases demonstrate that accurate system model expansion results can be obtained when a sufficient set of component modes that span the space of the system model modes are used.
机译：模型还原是一种常用的技术，用于减少结构动态模型的计算时间。然后可以使用减少过程中开发的变换矩阵将降低模型的结果扩展到全部空间。这项工作侧重于扩展由减少组件模型组成的系统模型的模式形状。通常，该扩展要求计算完整的空间系统模型，以便获得执行扩展所需的系统模型变换矩阵。计算全空间系统模型以确定扩展矩阵不节省计算时间，因此击败使用模型减少的目的。本文建议使用各个组件的扩展矩阵来扩展组装系统模型模式。在这项工作中，系统等效减少扩展过程（Serep）用于减少和扩展。扩展系统模型的准确性显示依赖于减少组件模型中保留的模式。近期对键不准确节点组（Viking）的可变性改进的工作表明，通过指定跨越系统模型模式的空间的减少/扩展过程中使用的模式数显着提高了结果。 Viking技术是这项工作中开发的扩展过程的基础。提出了多个分析案例以展示组件模式的选择如何影响扩展结果。分析案例表明，当使用跨越系统模型模式的空间的足够一组组件模式时，可以获得精确的系统模型扩展结果。

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