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针对实际应用中某型调频引信意外发火的问题,构建了引信超宽带(ultra-wide band,UWB)辐照效应试验系统,开展了辐照效应试验,分析了UWB对该型引信安全性能的影响,并确定了引信的失效机理。理论分析和试验结果表明:UWB会造成受试引信意外发火;重复频率越高,UWB对受试引信的干扰能力越强。同为100 k V/m的辐照场强,单次、10 Hz重频、20 Hz重频和50 Hz重频触发条件下引信发火率分别约为20%、30%、50%、80%。受试引信失效机理为:UWB辐射能量直接作用在引信天线和圆柱屏蔽腔体上,引起公共地电位波动,瞬变电压通过公共地电位传导至执行电路电源端,电源端瞬变电压上升率超过了晶闸管临界电压上升率,导致晶闸管意外导通,从而使引信发火。
In view of the accidental ignition of a certain type of FM fuze in actual application, a test system of the radiation effect of the UWB was constructed and the radiation effect test was conducted. The influence of the UWB on the safety performance of the Fuze , And determine the failure mechanism of fuze. Theoretical analysis and experimental results show that UWB can cause accidental ignition of fuze; the higher the repetition frequency, the stronger the interference of UWB on fuze. The firing rate of the fuze with the same 100 k V / m was about 20%, 30%, 50% and 80% respectively under single-frequency, 10 Hz, 20 Hz and 50 Hz repetition frequency triggering conditions. . The failure mechanism of the tested fuses is that the radiation energy of UWB directly affects the fuze antenna and the cylindrical shielding cavity, causing the public ground potential to fluctuate. The transient voltage is conducted to the power supply terminal of the executive circuit through the public ground potential, and the rate of increase of the power terminal transient voltage exceeds Thyristor threshold voltage rise rate, leading to accidental conduction thyristor, so fuze angry.