关键词: 云模型, 脆性度, 云重心评判法, 健康状态, 发动机缸盖装配系统

Abstract: To accurately evaluate the health status of engine cylinder head assembly system,aiming at the problems of randomness and fuzziness in the process of system evaluation,a health status evaluation method based on brittleness and cloud model was proposed.According to the characteristics of engine cylinder head assembly system and the principle of index system construction,a three-level evaluation index system was established to comprehensively characterize the health status of the system.The health status of engine cylinder head assembly system was classified by brittleness,and the uncertain mapping between evaluation index value and evaluation set was realized with cloud model theory.Then the health status of the system was evaluated based on cloud barycenter evaluation method,which effectively solved the problem of uncertainty conversion between qualitative concept and quantitative value in the evaluation process.Combined with brittleness theory and polymorphism theory,the calculation model of system brittleness was constructed,and the results of system health assessment were verified and analyzed based on the real-time brittleness value of the system.An engine cylinder head assembly system was taken as an example to verify the correctness and effectiveness of the proposed method.

Key words: cloud model, brittleness, cloud barycenter evaluation method, health status, engine cylinder head assembly system