Dynamic correction and compensation method about the measuring curve of shockwave reflected pressure
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摘要: 为准确获取爆炸冲击波反射压测量曲线，分析了影响其峰值的三个因素：测压系统的带宽、压力测量方式和信号传输线长度；使用激波管对冲击波测压系统进行动态校准，获取其动态特性；采用改进的levy法对其动态特性进行参数化建模，设计巴特沃斯滤波器作为补偿后的系统，计算出动态补偿环节，拓宽了测压系统的工作频带，且降低了测压系统谐振频率处的幅值；对冲击波反射压测量曲线进行动态修正与补偿，发现该方法能够修正冲击波反射超压峰值，明显降低由于测压系统的动态特性不够带来的峰值误差。该研究成果能够显著提高冲击波反射压测量峰值的准确度，为武器毁伤威力评价提供技术支持。Abstract: In the present work, to obtain the accurate measuring curve of explosive shockwave reflected pressure, we analyzed the three factors that influence the peak value, i.e. the band width of the pressure test system, the pressure test method, and the length of the signal transfer wire, adjusted the dynamic calibration on the shockwave pressure measuring system using the shock tube, and obtained the dynamic characteristics of the system using the ideal method of differential. With the improved version of the levy method, the parameter model about the dynamic characteristics was built. The Butterworth filter was designed as the system after the compensation for the calculation of the dynamic compensation tache. This method can expand the work frequency segment of the pressure test system and reduce the amplitude of the inherent frequency point so that the shock wave reflected pressure curve was rectified. It was found that this rectification and compensation method can correct the peak value of the shockwave reflected pressure and reduce the error from the dynamic characteristics of the shockwave pressure measuring system. This study can significantly raise the peak value accuracy of the shockwave reflected pressure and provide technical support for weapon damage assessment.
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Key words:
- shockwave reflected pressure /
- peak value /
- parameter model /
- correction and compensation
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图 1 PCB冲击波反射压测试系统的动态校准曲线
Figure 1. Dynamic calibration curve of the PCB shockwave reflected pressure measuring system
图 3 补偿前后系统幅频特性示意图
Figure 3. Amplitude frequency characteristics of the system before and after the compensation
图 6 PCB测压系统冲击波反射压曲线和补偿后的曲线
Figure 6. Shockwave reflected pressure curve and the curve after the compensation from the PCB measuring system
表 1 PCB测压系统原始冲击波反射压峰值和补偿后峰值对比
Table 1. Contrast of peak value from the original shockwave reflected pressure and the one after the compensation from the PCB measuring system
序号 原始冲击波曲线峰值/MPa 补偿后冲击波曲线峰值/MPa 与原始曲线峰值的偏差/% 1 1.496 9 1.567 5 4.7 2 8.771 2 9.213 8 5.0 3 0.924 8 0.855 8 -7.5 
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