Abstract
The existing serial coupling iterative design in product development has the uncertainty of the task duration, and it is difficult to solve the task duration. Based on the Markov chain method and the fuzzy theory, a fuzzy duration model of serial coupled iterative design task was constructed, and the fuzzy durations of each stage of product design task were obtained. Taking the body design process of an electric vehicle as an example, this method was applied for analysis. The research shows that the execution time of each stage task is prolonged under serial coupling iteration, and the longer the serial coupling iteration task execution chain is, the more the task execution time increases. This study has a certain reference function for complex serial coupled iterative design planning.
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