激波管反射阶跃压力上升时间高精度估计
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TH71

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国家自然科学基金(52005202)项目资助


High-accuracy estimation of the rise time of shock tube reflection step pressure
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    摘要:

    提出一种激波管反射阶跃压力上升时间高精度估计方法。 首先,基于压力传感器阶跃响应特性,建立激波管反射阶跃 压力上升时间估计理论模型;其次,采用经验模态分解实现阶跃响应信号噪声分量消除,提取衰减振铃分量;然后,基于衰减正 弦拟合估计衰减振铃分量的第一峰值时间和振荡周期;最后,根据理论模型实现激波管反射阶跃压力上升时间高精度估计。 仿 真实验结果表明,阶跃压力上升时间估计平均相对误差为 2. 57% ,比传统方法和直接拟合法的平均相对误差分别减小了约 7. 3 倍和 2 倍。 激波管实测实验结果表明,在铝膜片厚度分别为 0. 25 和 0. 07 mm 的条件下,反射阶跃压力上升时间估计均值 分别为 0. 712 和 0. 876 μs,相对误差分别为 0. 14% 和 1. 9% ,明显小于传统方法测量相对误差(7. 5% 和 4. 3% ),方法有效提高了 激波管反射阶跃压力上升时间的估计精度,并且具有更强的鲁棒性。

    Abstract:

    A high-accuracy estimation method for the rise time of shock tube reflection step pressure is proposed. First, a theoretical model for estimating the rise time of shock tube reflected step pressure is formulated, which is based on the step response characteristics of the pressure sensor. Secondly, the empirical mode decomposition is used to eliminate the noise components of step response signal, and the attenuation ringing component is extracted. Thirdly, the first peak time and oscillation period of the attenuation ringing component are estimated based on an attenuation sine fitting. Finally, the high-accuracy estimation of the rise time of shock tube reflection step pressure is realized according to the theoretical model. Simulation results show that the average relative error of the rise time estimation of step pressure is 2. 57% , which is about 7. 3 times and 2 times lower than those of the traditional method and the direct fitting method, respectively. Shock tube experiments show that the mean of the estimation values of rise time are separately 0. 712 μs and 0. 876 μs, and the measurement relative errors are 0. 14% and 1. 9% under the cases of 0. 25 mm and 0. 07 mm aluminum diaphragms. It is obviously smaller than the relative errors ( 7. 5% and 4. 3% ) of the measurement results of traditional methods. These results indicate that the proposed method improves the estimation accuracy of the rise time of shock tube reflection step pressure effectively and has stronger robustness.

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李永生,姚贞建,丁义凡.激波管反射阶跃压力上升时间高精度估计[J].仪器仪表学报,2022,43(9):10-18

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  • 在线发布日期: 2023-02-06
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