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通过流动诱导的随机振动在板块中的分散曲线的被动重建:边界反射和传感器放置的影响

Qihang Qin¹, Xun Wang¹, Jingjing He¹

¹School of Reliability and Systems Engineering, Beihang University, Xueyuan Road No. 37, Beijing 100083, China.

|October 14, 2023

概括

研究人员开发了一种新的传感器放置方法,以准确分析结构振动. 这种技术改善了从流动诱导的随机振动中提取分散曲线,克服了以前方法的局限性.

科学领域:

结构健康监测结构健康监测
振动分析振动分析
声波传播的声波传播

背景情况:

板状结构中的流动诱导的随机振动携带有关其属性的信息.
通过振动数据的交叉相关性来估计群体速度是分析引导波的已知技术.
由于传感器放置和板尺寸,现有的方法面临挑战,导致问题分散曲线提取.

研究的目的:

调查当前用于分析流动诱导振动的交叉相关方法的局限性.
提出一种新的传感器放置策略,用于强大的分散曲线的被动重建.
用被动振动分析提高结构性质和状态评估的准确性.

主要方法:

在两个测量点之间利用了流量诱导的随机振动信号的交叉相关性分析.
在圆形板上进行了被动实验,将传感器放在焦点上.
采用射线方法预测和分析波浪传播模式,包括边界反射.

主要成果:

在交叉相关性中鉴定了信号污染,原因是重叠的直线和代码波包.
在圆板实验中证明了直接传播和边界反射的明显分离.
验证了传感器在焦点的放置允许精确预测波浪的旅行时间和反射顺序.

结论:

波包的重叠是以前方法中分散曲线提取问题的主要原因.
一个特定的传感器放置标准,在圆板上验证,确保了强大的被动重建.
这种改进的方法保证了流动诱导的随机振动的可靠分散曲线分析.

关键词:

流动诱导的随机振动是一种随机的振动.噪音相关性噪音相关性被动检测检测是一种被动的检测.分散曲线的被动重建.随机引导的波浪是随机引导的波浪.

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