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Response prediction of elastic aircraft based on global transfer function

基于全局传递函数的弹性飞机响应预测

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Abstract

The unknown vibration has a significant negative effect on the elastic aircraft health. Therefore, it is necessary to predict the vibration response of the structure accurately. However, most existing methods have poor prediction effects when the target points exist operational force. To overcome this shortcoming, we propose a response prediction method based on the global transfer function (GTF). The GTF predicts the target responses directly using the reference responses, which neither requires operational force nor relies on the dynamics model. Further more, the contribution of the target point excitation can be effectively compensated and corrected. Experiments of finite element model and real-life systems is used to validate the effectiveness and accuracy of GTF. Effects of sensor location, number of sensors, excitation type, excitation application method and noise level are studied in detail. In addition, the GTF and response prediction results based on direct transfer function (DTF) are compared. The results show that the GTF could predict vibration response effectively and satisfy industrial requirements. Consequently, the GTF could be a promising computational method for response prediction of elastic aircraft.

摘要

未知振动对弹性飞机结构有显著的负面影响. 因此, 有必要对结构的振动响应进行准确的预测. 然而, 当目标点存在激励载荷时, 大多数现有方法的预测效果较差. 为了克服这一缺点, 我们提出了一种基于全局传递函数(global transfer function, GTF)的响应预测方法. GTF直接使用参考点的响应预测目标点响应, 不需要载荷参与, 也不依赖于动力学模型. 此外, 目标点激励的贡献也可以得到有效的补偿和校正. 我们通过有限元模型和实际系统的实验, 验证了GTF的有效性和准确性. 详细研究了传感器位置、传感器数量、激励类型、激励方式和噪声等因素的影响. 并对GTF和基于直接传递函数(direct transfer functio, DTF)的响应预测结果进行了比较. 结果表明, GTF能有效预测振动响应, 满足工业要求. 因此, GTF是一种很有前途的弹性飞机响应预测方法.

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Acknowledgements

This work was supported by Innovation Foundation for Doctor Dissertation of Northwestern Polytechnical University (Grant No. CX2022002), and the National Natural Science Foundation of China (Grant No. 11872312).

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Authors and Affiliations

  1. School of Aeronautics, Northwestern Polytechnical University, Xi’an, 710072, China

    Minzhao Zhang  (张敏照) & Bin Li  (李斌)

  2. Northwest Institute of Mechanical and Electrical Engineering, Xianyang, 712099, China

    Yingchao Wu  (吴迎超)

Authors
  1. Minzhao Zhang  (张敏照)
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  2. Yingchao Wu  (吴迎超)
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  3. Bin Li  (李斌)
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Contributions

Author contributions Minzhao Zhang designed the research. Minzhao Zhang wrote the first draft of the manuscript. Yingchao Wu set up the experiment set-up and processed the experiment data. Minzhao Zhang and Yingchao Wu helped organize the manuscript. Bin Li revised and edited the final version.

Corresponding author

Correspondence to Bin Li  (李斌).

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Conflict of interest On behalf of all authors, the corresponding author states that there is no conflict of interest.

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Zhang, M., Wu, Y. & Li, B. Response prediction of elastic aircraft based on global transfer function. Acta Mech. Sin. 39, 523057 (2023). https://doi.org/10.1007/s10409-023-23057-x

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