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加筋板中超高速撞擊聲發(fā)射源定位方法

Locating the hypervelocity impact source in a stiffened plate by acoustic emission

  • 摘要: 加筋板是航天器上的常用結(jié)構(gòu)。為研制基于聲發(fā)射技術(shù)的在軌感知系統(tǒng)，需要研究加筋板中聲發(fā)射波傳播規(guī)律及撞擊源定位方法。文章測定了斷鉛信號在加筋板中的傳播速度，對沿不同方向傳播的波速進(jìn)行了比較；通過有限元仿真，研究了筋體幾何尺寸對板中聲發(fā)射信號傳播規(guī)律的影響。試驗與仿真的結(jié)果表明：筋體對信號壓縮波波速影響較小，但會造成信號第一幅值的衰減，在傳感器布局設(shè)計時需要考慮到該因素。將加筋板中聲發(fā)射信號傳播速度取為沿不同方向傳播波速的平均值，可將源定位問題轉(zhuǎn)化成求取函數(shù)最小值的優(yōu)化問題，在加筋板上對斷鉛波源和超高速撞擊波源進(jìn)行定位效果較好。

     

    Abstract: The stiffened plate is a commonly used structure in spacecraft. In order to develop the onboard monitoring system based on acoustic emission technology, the wave propagation in a stiffened plate and the source locating method are important issues. In this paper, the speed of waves in different directions in a stiffened plate is measured by lead break tests. The effect of different dimensions of stiffeners is studied by FEM. Test and simulation results show that the stiffeners have but little effect on the extensional wave speed, but they cause an attenuation of the first peak amplitude. Assuming that the signal propagation velocity in the stiffened plate is a constant, the source can be located by the optimization of seeking the minimum of a function. From the locating tests of the lead break source and the hypervelocity impact source that were carried out on the stiffened plate, good results with small errors are obtained.

     

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