爆炸容器内小药量实验动态标定压力传感器

薛冰; 马宏昊; 沈兆武; 余勇

doi:10.11883/1001-1455(2015)03-0437-05

爆炸容器内小药量实验动态标定压力传感器

doi: 10.11883/1001-1455(2015)03-0437-05

中国科学技术大学近代力学系, 安徽合肥 230026

基金项目: 国家自然科学基金项目(51174183, 51134012)

详细信息

作者简介:
薛冰(1989—), 男, 博士研究生

通讯作者:
马宏昊, hhma@ustc.edu.cn

中图分类号: O384
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- 被引次数: 0
出版历程
- 收稿日期: 2014-03-28
- 修回日期: 2014-07-06
- 刊出日期: 2015-05-25

Dynamic calibration of pressure sensors by small-scale explosive experiments in an explosion containment vessel

Department of Modern Mechanics, University of Science and Technology of China, Hefei 230026, Anhui, China

摘要

摘要: 在爆炸容器中进行小药量空中爆炸实验, 利用传感器序列测量冲击波速度, 根据冲击波Rankine-Hugoniot关系获得测点近似理论峰值压力, 从而实现压力传感器的标定, 获得的灵敏度相对误差较小。同时测量了相应的冲击波参数, 并利用Modified-Friedlander公式进行数据后处理, 结果表明固定超压拟合更接近物理事实, 固定正相时间拟合也具有较高精度。最后进行了误差分析, 发现不同传感器特性及数据后处理方法都会带来一定误差。实验结果表明这种测量和后处理方法具有较高的精度, 可以同时标定传感器和测量冲击波参数。
- 爆炸力学 /
- 动态标定 /
- 空中爆炸 /
- 压力传感器 /
- 爆炸容器 /
- 冲击波 /
- 传感器序列
Abstract: Air blast experiments of small-scale charges were conducted in an explosion containment vessel.The shock wave velocity was measured by sensor series.And the approximately theoretic peak pressure was determined from the shock wave velocity by using the Rankine-Hugoniot relationship. The sensor was then calibrated, and the relative error of the sensitivity was small.The shock wave parameters were measured and post processed by using the modified-Friedlander equation.The results show that the nonlinear regression by fixing the overpressure is close to the physical fact, and the fitting by fixing the duration has a high precision.Error analysis reveals that the sensor properties and the post-processing methods can produce errors.Experimental results display that the shock wave parameter measuring and post-processing method suggested has a high precision.By this suggested method, the sensor calibration and parameter measurement can be conducted simultaneously.
- mechanics of explosion /
- dynamic calibration /
- air explosion /
- pressure sensor /
- blast vessel /
- shock wave /
- sensor series

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图 1 传感器序列示意图

Figure 1. Schematic of sensor series assembly

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图 2 空中爆炸实验装置示意图

Figure 2. Schematic of air explosion system

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图 3 冲击波到达传感器序列的时间

Figure 3. Arrival time of shock wave at sensor series

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图 4 超压时程曲线拟合

Figure 4. Nonlinear curve fit of overpressure history traces

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图 5 已标定传感器压力时程曲线

Figure 5. Overpressure history of standard sensor

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图 6 不同响应位置误差示意图

Figure 6. Scheme of error caused by different response positions

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表 1 传感器2动态标定结果

Table 1. Dynamic calibration results of sensor 2

测试编号	t_1，2/μs	t_{2, 3}/μs	Ma₂	Δp_m2/kPa	U/mV	k/(Pa·mV^-1)
1	21.0	27.7	1.335 89	93.95	101.003 9	930.16
2	21.0	27.5	1.343 88	95.28	101.725 9	936.63

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表 1 不同数据处理方法得到的冲击波参数

Table 1. Shock wave parameters by different data processing methods

测试	方法	Δp_m/kPa	t⁺/μs	I/(Pa·s)	α
1	实验	86.04	435.50	11.925
	固定Δp_m	93.95	470.02	12.478	2.018 6
	固定t⁺	90.19	435.50	12.290	1.604 2
2	实验	84.64	430.72	12.309
	固定Δp_m	95.28	469.87	12.971	1.914 4
	固定t⁺	92.31	430.72	12.898	1.464 3

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参考文献(7)

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