冲击波测试系统低频特性与补偿方法研究
Baozha yu Chongji(2019)
Abstract
为提高冲击波超压峰值的测量精度,多数学者把重点集中在系统高频特性研究上,以拓宽带宽的方式提高峰值测试的准确性.冲击波另外两个主要参数正压作用时间、比冲量却和测试系统的低频特性息息相关.针对实爆中出现的不同传感器正压作用时间差异较大的问题,对冲击波信号进行了边际谱分析,获得了信号的低频特性.建立了一阶参数模型来表征低频特性,通过激波管试验数据获取了7种系统的低频模型参数.采用零极点配置法设计了低频补偿模型.结果 表明:冲击波测试系统低频特性严重影响冲击波信号正压作用时间测试准确性,基于低频特性补偿的数据处理方法可以有效的提高冲击波信号正压作用时间、比冲量地测试精度.
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