Abstract
Mission reliability could systematically characterize the running state of a manufacturing system and the rationality of production task setting in advance. However, few studies can realize the mission reliability modeling, which integrates production scheduling based on fully considering the complexity, dynamics, and multi-state characteristics of a manufacturing system. Thus, a dynamic method for modeling the mission reliability of a multi-state manufacturing system with multiple production lines is proposed in this paper. First, the multi-state characteristic of manufacturing systems operation is analyzed. On this basis, considering the composition of manufacturing systems, the connotation and modeling mechanism of the mission reliability of manufacturing systems are proposed. Second, combining the discretization of machine performance states and dynamic continuity of the performance degradation process, the dynamic modeling method of multi-state machine performance and buffer usage are respectively discussed. The transfer evolution of task demands in the production line is analyzed, and the decomposition method of task scheduling and load mapping in multiple production lines is provided. Third, considering the characteristics of multiple production lines and the buffer of a manufacturing system, taking production tasks as the core and integrating production scheduling, a modeling method for the mission reliability of manufacturing systems is proposed. Finally, the effectiveness of the proposed approach is verified using a case study on the modeling of the mission reliability of a manufacturing system of aerospace parts.
Highlights
As individualized and small batch production modes become popular, manufacturing systems are gradually and increasingly required to be flexible, and the manufacturing process continuously incorporates the characteristics of multi-threading and multi-task flow
Zhang et al.: Dynamic Modeling Method of Mission Reliability of a Multi-State Manufacturing System and measurement involved in manufacturing systems
This paper focused on the unified modeling of the dynamic and multi-state characteristics of the manufacturing system mission reliability, and considered the task scheduling among multiple production lines and the impact of the buffer
Summary
As individualized and small batch production modes become popular, manufacturing systems are gradually and increasingly required to be flexible, and the manufacturing process continuously incorporates the characteristics of multi-threading and multi-task flow. Zhang et al.: Dynamic Modeling Method of Mission Reliability of a Multi-State Manufacturing System and measurement involved in manufacturing systems It regards the manufacturing system as a simple combination of machines and integrates the predicted results of machine failure to represent the reliability of the system. Chen et al [22] proposed the operation mechanism of the fuzzy multistate manufacturing system of a single series production line, and established the ESFN model, which emphasized the dynamic transfer between states, but ignored the influence of the dynamic performance degradation on the multi-state characteristics. To realize the unified modeling of dynamic and multi-state characteristics of manufacturing system mission reliability, the inherent characteristics of multiple production lines in the manufacturing system, and the influence of buffers on manufacturing processes are considered, and the connotation of the mission reliability of manufacturing systems is analyzed from the perspective of system engineering.
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