ABSTRACT
As modern manufacturing systems developed towards larger size, higher automation, more flexible, more efficient and higher precision continuously, the parts and equipment in systems greatly increase. As a result, the probability of system failures will be increased significantly under complex operating environment. Therefore, how to ensure the reliability of manufacturing systems has become a major problem facing the users of manufacturing systems. In order to solve this problem, a reliability analysis method of multi-state manufacturing system (MSMS) under specific operating environment was proposed in this paper. Firstly, the definition of operating environment of MSMS is stated and three aspects factors (machining process, human personnel and environmental condition) affecting the operational reliability are explained. Secondly, the state space model was introduced to describe the state degradation path of manufacturing system and its main equipment units with specific operating factors. Thirdly, an improved universal generating function (UGF) method is employed to analyze the performance state and operational reliability of MSMS. Finally, a case study of manufacturing system for machining double-parts cluster composed of cylinder is taken to prove the validity and usability of this method. It is very significant to enhance reliability and capability of manufacturing equipment by this method.
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