关键链多项目管理中能力约束缓冲大小研究

Capacity constraint buffer sizing method for critical chain multi-project scheduling

为了解决多项目管理中面临的诸多不确定性问题,提出了关键链多项目管理法中确定能力约束缓冲大小的新方法。阐述了使用鼓资源的活动网络特点及其与单项目管理中接驳链的不同之处。综合考虑了鼓资源紧张度、鼓网络复杂度和鼓活动间隙度三个因素对能力约束缓冲大小的影响。采用具体算例,同50%法和不考虑鼓活动间隙度法进行了比较。模拟结果表明,该方法计算的缓冲更小,仍能够以较高的可能性提供足够的错开时间,保证了项目群较高的最终完工率,从而验证了所提方法的有效性和实用性。

To solve the various uncertainty problems in multi-project management,a new method to determine the capacity constraints buffer size was proposed in critical chain multi-project scheduling.The network characteristics of drum activities and difference between drum activities and activities on the feeding chain were discussed.Effects of drum resource tightness,drum network complexity and drum space interval were considered and integrated in this method.A simulation experiment was carried out to demonstrate application of the proposed method.Comparison of the proposed method with the cut and paste method and the approach without incorporating drum space interval were performed.The result showed that the suggested method generated smaller buffer size while providing the sufficient staggered time and almost the same on-time completion rate of the whole projects.Thus,the effectiveness and practicability of the proposed method were validated.