Research on anti-shockwave performance of the protective equipment for the head of a soldier based on shock tube evaluation
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摘要: 为了优化单兵头面部防护装备结构，提升防护性能，首先开展了基于实爆场和激波管环境的裸头模抗爆炸冲击波对比测试。在此基础上，利用激波管对佩戴不同结构、不同防护等级的头盔-头模系统分别进行了正向及侧向爆炸冲击波防护性能测试，并对头盔-头模系统前部、前额部、顶部、后部、耳部以及眼部等重点区域的冲击波超压峰值和持续作用时间进行对比分析。实验结果表明，基于激波管的抗爆炸冲击波测试方法可替代外场实爆进行考核。受到冲击波正向作用时：两半盔头模顶部测点所测冲击波超压峰值约为喷管出口的 1/6，是裸头模和一体盔头模的 1/3；冲击波在两半盔顶部分体结构处分流卸压并形成叠加反射，导致作用时间延长（从 5.5～8.5 ms），但超压峰值降低明显；对后部测点而言，冲击波的绕行和叠加使一体盔头模所测冲击波超压峰值（365 kPa）略高于两半盔头模（303 kPa），约为裸头模（148 kPa）的 2.5 倍。通过提高单兵头面部防护装备结构密闭性（如佩戴眼镜、耳罩或者防护面罩），可有效阻止冲击波进入头盔-头模系统内部，减弱叠加汇聚效应，提高单兵头面部装备防护性能。Abstract: In order to optimize the structure and improve the performance of the head and face protective equipment for an individual soldier, firstly, the blast wave resistance tests of the bare-head model were carried out in real explosion field and shock tube environments, respectively. On this basis, the forward and lateral blast shockwave protective performance tests for helmet-head systems with different structures and protection levels were carried out by using the shock tube method. Finally, the peak values and durations of shockwave overpressure in the front, forehead, top, back, ear and eye areas of the helmet-head systems were compared and analyzed. The experimental results show that the blast shockwave test using a shock tube can be a substitute for the real explosion field test. When subjected to the effect of frontal shock wave, the peak value of the shockwave overpressure measured at the top measuring point of the two-half-helmet head model is about 1/6 compared with that of the nozzle outlet and 1/3 of the bare-head model as well as the integrated-helmet head model. The shockwave splits and relieves pressure at the split structure on the top of the two-half helmets and forms a superimposed reflection, resulting in a prolonged action time (5.5−8.5 ms), but a significantly decreased peak overpressure. For the rear measuring points, the peak overpressure (365 kPa) of shockwave measured by the integrated-helmet head model is slightly higher than that (303 kPa) measured by the two-half-helmet head model, and about 2.5 times as high as that (148 kPa) measured by the bare head model. By improving the structural airtightness of individual head and face protective equipments (such as wearing glasses, earmuffs or protective masks), shockwaves can be effectively prevented from entering the helmet-head systems, the stacking convergence effect can be weakened, and the protective performance of individual head and face equipments can be improved.
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Key words:
- blast wave /
- shockwave resistance /
- individual equipment /
- shock tube
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图 2 实爆现场示意图及爆炸波形
Figure 2. Schematic diagram for the far-field blast environment and explosion waveforms
图 3 激波管测试得到的超压时程曲线
Figure 3. Overpressure-time curves obtained in the shock tube experiments
图 4 头部模型在激波管中的位置照片
Figure 4. Photos showing the head model positions in the shock tube
图 5 实爆自由场和激波管喷管出口爆炸超压的演化
Figure 5. Overpressure changes in the blast free field and at the outlet of the shock tube nozzle
图 6 实爆场和激波管测试环境下裸头模上不同测点位置的超压时程曲线
Figure 6. Overpressure-time curves at different measured points in the bare head in the far-field blast and shock tube environments, respectively
图 8 裸头模、两半盔头模和一体盔头模各部位正向实验结果
Figure 8. Forward experimental results of different parts for the bare head, two-half-helmet head and integral-helmet head models
图 9 裸头模、两半盔头模和一体盔头模正向测试超压峰值结果统计
Figure 9. Forward experimental overpressure peak for different parts of the bare head, two-half-helmet head and integral-helmet head models
图 10 裸头模、两半盔头模和一体盔头模系统的眼部和耳部正向测试实验结果
Figure 10. Forward experimental results for the eye and ear of the bare head, two-half-helmet head and integral-helmet head models
图 12 裸头模、两半盔头模和一体盔头模各部位侧向实验结果
Figure 12. Lateral experimental results for different parts of the bare head, two-half-helmet head and integral-helmet head models
图 13 裸头模、两半盔头模和一体盔头模侧向超压峰值
Figure 13. Lateral overpressure peaks for the bare head, two-half-helmet head and integral-helmet head models
图 14 全防护状态示意图及喷管出口冲击波超压时程曲线
Figure 14. Schematic diagram of the full-protection head model and overpressure-time curves at the nozzle outlet
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