超高速撞击声发射信号在Whipple结构中的传播时序特性研究

发布时间：2018-06-23 10:57

本文选题：Whipple防护结构 + 声发射信号　；参考：《宇航学报》2015年03期

【摘要】：为研究屏/舱声发射信号传播时序特性,以典型Whipple防护结构为例,利用二级轻气炮对其进行超高速撞击实验。首先,利用独立于靶件的"遮挡板"阻挡弹丸击穿前板形成的二次碎片云撞击后板,利用布置在前、后板特定位置的超声换能器采集单纯的前板声发射信号,分析信号模态特征,结果表明:前板信号主要包括S0、A0和S2等三种模态板波,经圆柱支撑构件传播进入后板之后,全部转换为A0模态板波。在此基础上,建立了屏/舱声发射信号到达时序预测公式。其次,撤除遮挡板,利用布置在后板特定位置的超声换能器采集前、后板信号的混叠信号,分析两种信号的到达时序并与预测结果进行对比,结果验证了达时序预测公式的有效性。
[Abstract]:In order to study the time-series characteristics of acoustic emission signal propagation in screen / cabin, a typical Whipple protection structure was used to carry out hypervelocity impact experiments with a two-stage light gas gun. First of all, the "shield" independent of the target is used to prevent the projectile from breaking through the front plate to form a secondary debris cloud impact on the back plate, and the ultrasonic transducer arranged in the front and rear plate is used to collect pure acoustic emission signals from the front plate. The modal characteristics of the signal are analyzed. The results show that the front plate signal mainly consists of three kinds of modal plate waves: S0 A0 and S2, which are converted to A0 mode plate waves after propagating through the cylindrical braced members into the rear plate. On this basis, the prediction formula of arrival time series of acoustic emission signals from screen / cabin is established. Secondly, the baffle is removed and the mixed signal of the back plate signal is collected by the ultrasonic transducer arranged in the specific position of the back plate. The arrival time series of the two signals are analyzed and compared with the predicted results. The results show the validity of the formula.
【作者单位】：哈尔滨工业大学空间碎片超高速撞击中心;中国空间技术研究院载人航天总体部;
【基金】：中国空间技术研究院载人航天总体部资助项目(020109)
【分类号】：V528

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