Performance reliability analysis method of dynamic systems under stochastic processes

Performance reliability of dynamic systems is influenced by both the long term factors and short term factors, and most of which are dynamic processes with stochastic characteristics. This paper presents a performance reliability analysis method of dynamic systems considering all kinds of random factors. Firstly, the expressing method of the dynamic system and random factors is introduced, then the performance reliability analysis methods under the influence of short term and long term factors are described respectively. Integrating the advantages of the two methods, a performance reliability evaluation method based on the simulation model is developed. Comparing with the traditional theory, the presented method takes the dynamic characteristics of the uncertainties into account, and treats them as the stochastic processes and not the random variables, which delivers much more practicability for this method. Furthermore, the simulation-based method gives a reasonable description of uncertainties for the dynamic system, and has a higher efficiency and precision. Finally, a typical dynamic system, flight actuator system, is selected as the study case, results show that this method is feasible.