Reliability of stabilized electro-optical sight system is important for the helicopter airborne weapon system. The concepts of military electro-optical system are presented, as well as the function and components of the helicopter airborne stabilized sight system. The reliability diagram and mathematical models of shipboard helicopter stabilized sight system are given. The factors influencing the systematical reliability and the failure modes are researched. The reliabilities of stabilized sight system structure, optics and electrics are discussed. A prediction method of reliability for stabilized sight system by computer simulation is proposed. Failure of a shipboard helicopter stabilized sight system occurred for two times during the 96 hours reliability test, which met the reliability requirement that the mean time between failures (MTBF) should be less than 32 hours. Prediction and analysis on the reliability of stabilized sight turret combined with corresponding provisions can improve the design quality and shorten the development cycle.%稳瞄系统可靠性对直升机载武器系统可靠性具有重要影响.通过对产品可靠性概念和军用光电系统可靠性、直升机栽稳瞄系统的功能和组成单元的阐述,给出了舰载直升机光电稳瞄系统的可靠性框图和数学模型.研究了舰载直升机稳瞄系统的可靠性影响因素和系统故障模式,探讨了稳瞄系统结构、光学和电气可靠性,提出通过计算机仿真对稳瞄系统可靠性进行预计分析的方法.某舰裁直升机稳瞄系统在96 h可靠性试验过程中出现故障2次,达到MTBF≤32 h的可能性指标要求.对系统可靠性提前进行预估并采取相应的设计措施,保证产品可靠性达到设计要求,提高设计质量,缩短研制周期.
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