Research on low frequency characteristics and compensation method of a shock wave test system

XU Hao; DU Hongmian; FAN Jinbiao; ZU Jing; WANG Lingyu

doi:10.11883/bzycj-2019-0233

Volume 39 Issue 10

Oct. 2019

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Article Navigation > Explosion And Shock Waves > 2019 > 39(10): 104102

XU Hao, DU Hongmian, FAN Jinbiao, ZU Jing, WANG Lingyu. Research on low frequency characteristics and compensation method of a shock wave test system[J]. Explosion And Shock Waves, 2019, 39(10): 104102. doi: 10.11883/bzycj-2019-0233

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XU Hao, DU Hongmian, FAN Jinbiao, ZU Jing, WANG Lingyu. Research on low frequency characteristics and compensation method of a shock wave test system[J]. Explosion And Shock Waves, 2019, 39(10): 104102. doi: 10.11883/bzycj-2019-0233

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Research on low frequency characteristics and compensation method of a shock wave test system

doi: 10.11883/bzycj-2019-0233

Key Laboratory of Instrumentation Science & Dynamic Measurement Ministry of Education, North University of China, Taiyuan 030051, Shanxi, China

Received Date: 2019-06-10
Rev Recd Date: 2019-07-14

Available Online: 2019-09-25

Publish Date: 2019-10-01

Abstract

Abstract

In order to improve the measurement accuracy of shock wave overpressure peak, most scholars focus on the study of high-frequency characteristics of the system for improving the accuracy of peak value measurement by broadening the bandwidth. The other two main parameters of the shock wave, positive pressure action time and specific impulse, are closely related to the low frequency characteristics of the test system. Aimed at the problem that the positive pressure action time of different sensors varies greatly in real explosion, the marginal spectrum analysis of the shock wave signal was carried out, and the low frequency characteristics of the signals were obtained. A first-order parametric model was established to characterize the low-frequency characteristics, and the low-frequency model parameters of seven systems were obtained from the experimental data of shock tube. The low-frequency compensation model was designed by the zero pole configuration method. The results show that the low-frequency characteristics of shock wave testing systems seriously affect the accuracy of positive pressure action time measurement of shock wave signals. The data processing method based on the low-frequency characteristic compensation can effectively improve the measurement accuracy of positive pressure action time and specific impulse of shock wave signals.
- shock wave test system,
- low frequency characteristics,
- positive pressure action time,
- shock tube experiment

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