Reliability Modeling And Analysis Of High-Power Solid-State Laser Power Conditioning System

As an important part of a high power solid laser facility, power conditioning system outputs energy pulses meeting the laser facility’s requirements. As the most concentrated part which reflects the facility’s strong electric characteristics, power conditioning system’s reliability is directly related to the overall device’s reliability, stability, maintainability, energy conversion efficiency, operating life and other aspects. The previous studies on power conditioning system’s reliability, on the one hand, lack of a detailed analysis on failure mode and effect of its various subsystems, on the other hand, lack of reliability study on the gas spark switch as its key unit components.Based on the research background and the actual demand, the functional structure of power conditioning system’s subsystems is introduced. On the basis of analyzing the function structural characteristics, the general principles of power conditioning system’s qualitative reliability design are put forward, as well as measures about physical design and device design should be adopted in the subsystems qualitative reliability design. Then each subsystem’s comprehensive FMEA analysis is conducted to identify the corresponding failure modes, effects and reasons, and the improvement measures are proposed.Research on the reliability of the key unit components is also an important part of the work. By establishing fault data collection standard and management mode, fault data collection work is carried out, as a basis for choosing the gas spark switch unit as the key unit component and the FTA analysis of it. By the transformation of the fault tree to Bayesian networks modeling, analysis of reliability evaluation and diagnostic analysis are carried out based on Bayesian network. As a result, suggestions of the gas spark switch unit’s qualitative reliability growth are put forward after the main fault causes analysis according to engineering practice, and the improve effect are described.It is important to investigate the reliability modelling and reliability analysis of critical components of the power conditioning system. This paper has studied the degradation based reliability analysis of the main gas spark switch unit. A gamma process based degradation model is introduced by simultaneously considering the unit-to-unit variability of components and the effect of environmental and loading stress. The parameter estimation, degradation prediction and reliability assessment have also been studied by utilizing the Bayesian method. These methods introduce a new perspective and dynamic framework for the operation and maintenance of the main gas spark switch unit.Through these studies, the status of power conditioning system and its key unit components’ reliability has been understood more clearly. Conclusions and recommendations for improvement, combined with actual project, have achieved good results. So far, a reliability study working idea in the subsystems and unit components level has been established, which can provide reference for other system devices and cell assembly’s reliability work, so as to gradually form a more complete and comprehensive reliability study of the high power solid laser facility.