关键词: 并行设计, 耦合活动, 重叠方式, 时间模型, 迭代, 柴油机

Abstract: To improve the efficiency of concurrent design, the iteration of coupled activities was analyzed and a time computing model was presented for the overlapping of coupled activities in concurrent product development process. Sensibility and changeability of design activity were taken into consideration in this model. The overlapped rework time was firstly calculated by integral for the function of rework probability. Next, the non-homogeneous Poisson process was constructed to describe the stochastic process in which the downstream activities found the development errors of the upstream activities. Then, the inverse rework time was calculated by mathematical statistic method based on formulating the evolution function. And the time model of coupled activity development was formulated. Finally, the optimization of development time was demonstrated by an illustrative example and it was indicated that design of piston-connecting rod unit of the diesel engine based on the MATLAB optimization toolbox was improved. Computing results showed that the time model was effective and it provided an analysis method for time-cost trade-offs.

Key words: concurrent design, coupled activities, overlapping, time model, iteration, diesel engine