电火工品桥带温升数学模型及可靠性设计应用

Temperature Rise Mathematical Model of Bridge Strip Electric Initiator and Its Reliability Design

依据焦耳-楞次定律及傅里叶导热定律,建立了恒流激励下电火工品桥带温升的数学模型,得到了药剂不同位置处的温度分布,并给出了发火电流与安全电流的计算方法。利用感度升降法分别对两种桥带式电火工品的发火感度进行了测试,研究结果表明理论计算与试验结果吻合较好,桥带温升数学模型合理,可以用于桥带式电火工品的输入可靠性和安全性设计。

Based on the Joule Lenz’s law and Fourier heat conduction law, a mathematical model of the temperature rise of bridge strip under direct current excitation was established, the temperature distribution at different position of charge was obtained,and the theoretical calculation method of the firing current and safety current was also proposed. The firing sensitivity of two electric initiators was measured by Bruceton method. The results show that the theoretical calculation results are in good agreement with the experimental results, which indicate the bridge strip temperature rise model is reasonable and can be used in the input reliability and safety design on bridge strip electric initiator.