On the analysis and design method of system safety

Based on the logical relations among its four major contents and a qualitative approach of system safety analysis and design, a new method for the treatment of a secondary failure, multiple failure and hidden failure in FHA and FMEA were proposed. Moreover, a mean rank method for the quantitative analysis of the base events was given by which the distribution parameter estimation formulas of the incomplete life data were derived. Finally, a more appropriate and accurate technological package for system safety analysis and design was established and applied to the system safety engineering of some airplane flaps successfully.