A Liquid Launch Vehicle Safety Assessment Model Based on Semi-Quantitative Interval Belief Rule Base

As the propulsion part of a space launch vehicle and nuclear weapon missile, health status liquid rocket determines whether missile can function normally. Therefore, it is great significance to evaluate rocket. structure becoming increasingly sophisticated, subjective judgment alone no longer meet needs actual system. an expert system gray-box model, belief rule base (BRB) process both qualitative quantitative information. The knowledge used in safety assessment However, practical applications, traditional BRB model still has two problems, which are that (1) when there too many premise attributes, easily leads explosion combination rules, (2) reliability rules not considered reasoning. this paper proposes with intervals (intervals-BRB) on basis BRB. interval-BRB retains advantage BRB, handle semi-quantitative In addition, proposed changes reference point prerequisite attribute interval combination. This solves problem explosive rule. ER-rule (evidential reasoning rule) introduced into procedure, weight at same time, shortcoming does consider Finally, CMAES optimization algorithm optimize initial obtain better performance. verified by data set rocket, experimental results show achieve good results.