中文摘要：

针对并行开发过程中设计活动间存在迭代和重叠的情形，提出一个时间计算模型及其优化方法。依据矩阵规划后的设计结构矩阵，将设计活动组划分为多个耦合活动块和非耦合活动块，按信息流方向依次计算活动重叠造成的设计修改时间，进而建立产品开发的时间模型。在给定成本约束下，将开发时间最短问题转化为有约束的最优化问题，并给出相应的求解算法。最后通过实例运算表明了时间模型及其优化方法的有效性。

英文摘要：

A time computing model with its corresponding optimization method is presented for the overlapping and iteration between design activities in concurrent product development process. The design activity groups are divided into coupling and non-coupling activity blocks based on the programmed design structure matrix. According to the direction of information flow, rework time of each design activity causedby overlapping is calculated in turn. Then the time model of product development is formulated. Given cost constraint, the problem of shortest development time is transformed into constrained optimization problem, and a corresponding algorithm for this problem is proposed. The results of application example show that the time model and optimization method are effective.