冲击波测试系统的动态建模及应用

Dynamic Modeling and Application of Shock Wave Testing System

若测试系统的带宽不能完全覆盖冲击波信号的有效带宽,就会存在较大的动态误差。根据冲击波测试系统的激波管动态校准实验数据,建立了冲击波测试系统动态数学模型,设计了动态校正数字滤波器。仿真结果表明,动态校正滤波器明显提高了系统动态响应的快速性,展宽了工作频带。实弹测试结果显示,校正滤波器能提高冲击波测试的精度和可靠性。该方法能有效消除动态误差,提高测试数据的准确性。

If the bandwidth of measurement system can not cover completely the effective bandwidth of a blast wave signal,a dynamic error is inevitably introduced. By using the shock-tube based dynamic calibrated data,a dynamic mathematical model of measurement system is established,and a dynamic compensated digital filter is designed, which shortens the dynamic response time of test system and widens the work bandwidth significantly. The experimental data processing by the correction filter improves the reliability of the uncertainty. The simulation results show that this method can effective- ly eliminate the dynamic error and increase the accuracy of test data.