压电引信大着角发火性数值仿真方法
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摘要
针对压电触发引信大着角对靶射击试验瞎火原因难以分析的问题,提出了压电触发引信大着角发火正确性的数值仿真方法。通过比较仿真得到的压电晶体上不同位置处压电晶体单元的法向应力峰值平均值和等效综合应力峰值平均值来对压电触发引信大着角发火正确性进行判断。随着着角的增大,压电晶体表面应力值呈现逐渐减小的趋势,与理论分析结果一致,该方法可行。铝合金头部锥角变化对压电晶体应力影响较大,引信头部最优锥角为100°;采用7A04铝合金代替2A12铝合金作为引信头材料可以使大着角碰击目标时压电晶体表面的碰靶应力至少增大30%以上,进而可提高引信的发火正确性。
In order to correctly analyze the misfire problem of piezoelectric trigger fuze hitting targets at large impact angle, a method that comparing the average of normal stress peak and equivalent stress peak at different locations on piezoelectric ceramics model when rocket hitting steel target at different impact angles was proposed. The stress on the surface of piezoelectric ceramics model tends to decrease with the increase of impact angle, this result was consistent with the theoretical calculation result, which showed that the method was feasible. Furthermore, the variation of aluminum alloy fuze head cone angle had a great influence on the stress. It was concluded that the optimum cone angle of head cone was 100°. In addition, the substitution of 2 A12 with 7 A04 aluminum alloy could effectively increase the stress on the surface of piezoelectric ceramics model up to 30%, which reduced misfire rate on a certain degree.
In order to correctly analyze the misfire problem of piezoelectric trigger fuze hitting targets at large impact angle, a method that comparing the average of normal stress peak and equivalent stress peak at different locations on piezoelectric ceramics model when rocket hitting steel target at different impact angles was proposed. The stress on the surface of piezoelectric ceramics model tends to decrease with the increase of impact angle, this result was consistent with the theoretical calculation result, which showed that the method was feasible. Furthermore, the variation of aluminum alloy fuze head cone angle had a great influence on the stress. It was concluded that the optimum cone angle of head cone was 100°. In addition, the substitution of 2 A12 with 7 A04 aluminum alloy could effectively increase the stress on the surface of piezoelectric ceramics model up to 30%, which reduced misfire rate on a certain degree.
引文
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[2]程永生.触发引信碰撞模拟仿真研究[J].电子技术参考,1997(3):25-35.
[3]章洪深.碰击式压电引信压电机构中应力波的传播分析[J].兵工学报(引信分册),1983(4):34-50.
[4]曹后颐.关于影响压电引信发火和瞬发度的几个问题的讨论[J].兵工学报(引信分册),1979:158-170.
[5]《引信设计手册》编写组.引信设计手册[M].北京:国防工业出版社,1978.
[6]刘兵辰,李娟.对装有压电引信的低速破甲弹破甲不稳定问题的研究[J].科技信息,2009(18):364-365.
[7]杨翔,王雨时,闻泉,等.航空火箭弹引信擦地炸最小发火落角仿真方法[J].探测与控制学报,2015,37(6):25-30.
[8]刘鹏,王雨时,闻泉,等.靶板状况对亚音速射弹引信触发弹道环境的影响[J].探测与控制学报,2016,38(5):58-63.
[9]杨翔,王雨时,闻泉,等.单兵火箭弹引信前冲过载与触发开关动态特性[J].探测与控制学报,2015,37(2):46-50.
[10]张金鹏,王雨时,李作华,等.基于仿真的动态载荷下圆柱支筒屈曲特性[J].探测与控制学报,2016,38(2):37-42.
[11]李言语.陶瓷/金属复合靶板抗侵彻数值分析及影响因素研究[D].南宁:广西大学,2013.
[12]刘雨,王雨时,闻泉.子弹垂直入水冲击过载数值仿真方法[J].探测与控制学报,2015,37(1):64-66.
[13]谢灿军,童明波,刘富,等.7075-T6铝合金动态力学试验及本构模型研究[J].振动与冲击,2014(18):110-114.
[14]Chen G,Li J,He Y,et al.A new approach to the determination of plastic flow stress and failure initiation strain for aluminum alloys cutting process[J].Computational Materials Science,2014,95(95):568-578.
[15]皮友东.黄铜与紫铜及黄铜与低碳钢异种金属的激光焊接[D].北京:北京工业大学,2007.