| For the issue of complex pyrotechnic systems reliability modeling and analysis with multiple components of light,mechanical,and electrical and electronic components,the diode laser ignition system composed of circuit control section,fiber transmission section and pyrotechnic device was taken as the research object.The design of output power of laser was conducted at the state of laser ignition and optical fiber built-in-test(BIT).The technical target of each component was proposed to analysis the entire component failure modes of diode laser ignition system.System reliability GO model was built to get the cutset and system reliability adopting GO methodology qualitative analysis and quantitative computing methods.The research and achievements are as follows:(1)The key components′s qualification of diode laser ignition system was built by analyzing the structure and function of the system.The failure mode to component at unit level and table of its impact on the system were built by FMEA method.The key components affecting the function reliability of the diode laser ignition system in the weapon system are obtained,which provides a train of thought for improving system reliability in design and production phase.(2)A mathematical model of diode laser ignition system functional reliability including firing reliability and safety reliability were built adopting stress-strength interference model.To thoroughly explore the factor affecting transmission loss of laser power in optical path,the experiments have been conducted to measure the loss.241 sets of loss data were obtained,and the conclusion that the loss of laser power is subject to normal distribution with a mean of 0.265 deviations of 0.046 was proved.The output laser power is 0.242W under the condition of 0.999 firing reliability,and the output laser power is 0.315W under the condition of 1.3 time design margin and beyond 0.999999firing reliability calculated by Monte Carlo.The output of pigtail is 0.65m W at the state of BIT under the condition of safe requriment.(3)The GO diagram in optical fiber built-in-test,laser ignition,optical power detection and temperature control functional state were built using GO methodolody.The decision which entire component of diode laser ignition system is first order cutset was made using GO methodology qualitative analysis methods.The conclusion of system reliability greater than 0.995 was made using GO methodology quantitative analysis methods under continuous working 100h which can be equivalent to working 3.6×10~6times at impulse firing working mode condition.The correctness of the GO methodology qualitative analysis is verified by comparing the result of FTA method.And the correctness of the GO methodology quantitative analysis is verified by Monte Carlo. |
