格林函数反演泥石流石块冲击力的光纤传感试验方法

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摘要梳齿坝等结构体在受到泥石流石块撞击时可被简化为悬臂梁。基于悬臂梁变形的静力学理论方法是求解石块撞击悬臂梁的冲击力的主要方法之一，但它无法反应泥石流石块撞击结构的动力学场景。针对石块撞击悬臂梁的动力学特性，本研究基于光纤光栅传感技术，通过落锤模拟泥石流中的石块，开展了7组不同工况的落锤冲击试验，并通过格林函数对落锤的冲击力时程进行反演。结果表明: 格林函数能有效反演石块撞击悬臂梁的冲击力时程。冲击力反演结果的精度受制于解调仪的采样频率，其试验标定的误差为15.3%，静力学法计算结果比本文计算结果高3-5倍。因此，本研究在解决了如何描述泥石流石块撞击悬臂梁的动力学特性这一科学问题的同时，反演结果也进一步获得提升，可有效为泥石流防治工程设计提供理论基础。

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	杨超平1
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关键词 ：泥石流, 石块冲击力, 光纤光栅, 格林函数

Abstract：Structures such as comb dam can be simplified as cantilever beam when they are impacted by debris flow boulders. The statics method based on the cantilever deformation is one of the main methods to calculate the boulder impact force, but it cannot describe the dynamic behavior of the structure. In view of the above issues, the falling weight was used to simulate the boulder of debris flow, and 7 groups of drop weight impact tests were performed based on the fiber grating sensing technology, and the hammer impact force under different working conditions was inverted by using Green’s function. The results show that Green’s function can effectively invert the boulder impact force. The inversion error is affected by the sampling frequency of the demodulator, which is about 15.3%, and the results calculated by the static method are 3-5 times higher than those calculated in this study. Therefore, this study solves the scientific problem of how to describe the dynamic characteristics of boulder impacting the cantilever beam, and further improves the inversion results, which can effectively provide a theoretical basis for the design of debris flow prevention and control engineering.

Key words： debris flow boulder impact force fiber Bragg grating Green’s function

收稿日期: 2022-03-01 出版日期: 2023-05-15

引用本文:

杨超平1,2，张少杰1，夏曼玉1，杨红娟1. 格林函数反演泥石流石块冲击力的光纤传感试验方法[J]. 振动与冲击, 2023, 42(9): 145-150.
YANG Chaoping1,2, ZHANG Shaojie1, XIA Manyu1, YANG Hongjuan1. Optical fiber sensing test method for inversion of impact force of debris flow rocks with Green’s function. JOURNAL OF VIBRATION AND SHOCK, 2023, 42(9): 145-150.

链接本文:

http://jvs.sjtu.edu.cn/CN/ 或 http://jvs.sjtu.edu.cn/CN/Y2023/V42/I9/145

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