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首页> 外文期刊>Journal of the Chinese Society of Mechanical Engineers, Series C: Transactions of the Chinese Society of Mechanical Engineers >Balanced shaker and sensor placement for modal testing of large flexible structures
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Balanced shaker and sensor placement for modal testing of large flexible structures

机译：平衡的振动器和传感器放置，用于大型柔性结构的模态测试

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摘要

A systematic analytical approach regarding the location of shakers and sensors for the dynamic testing and modal identification of the Z1 truss substructure of the International Space Station(ISS) is discussed in this paper. It is assumed that every degree of freedom of the finite element model is a possible place for sensor location, but shakers can only be placed at selected locations (not all locations are technically suitable for the shaker placement). From this starting point, a subset of four shaker locations and a subset of about 400 sensor locations were selected for the analytical modal identification test of all the ISS modes below 50 Hz of frequency. The locations were selected based on the shaker and sensor performance in the identification test that is comparable to the performance of the full sets. The performance is defined in terms of the Hankel singular values (HSV) that characterize the joint controllability and observability properties of each shaker and sensor for each natural vibration mode of the structure. The additive property of the structural Hankel singular values was used to locate the shakers and sensors. The placement results show good dynamic performance of the structure with the subset of shaker and sensor locations as compared to the structure with the full set of shakers and with sensors located at all degrees of freedom. The main objective of the paper is to present the sound theoretical background and show its practical advantages.
机译：本文讨论了关于振动台和传感器位置的系统分析方法，用于对国际空间站（ISS）的Z1桁架子结构进行动态测试和模态识别。假定有限元模型的每个自由度都是传感器位置的可能位置，但是振动筛只能放置在选定的位置（并非所有位置在技术上都适合振动筛的放置）。从这个起点开始，选择了四个振动器位置的子集和大约400个传感器位置的子集，用于频率低于50 Hz的所有ISS模式的分析模式识别测试。根据识别测试中的摇床和传感器性能（与整套设备的性能相当）选择位置。根据汉高奇异值（HSV）定义性能，汉高奇异值表征了结构的每种自然振动模式下每个振动器和传感器的联合可控性和可观察性。结构Hankel奇异值的加性用于定位振动器和传感器。放置结果显示，与带有整套振动器和位于所有自由度的传感器的结构相比，具有振动器和传感器位置的子集的结构具有良好的动态性能。本文的主要目的是提供合理的理论背景并展示其实际优势。

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