基于CPM网络的关键链汇入缓冲设置研究

Study on Feeding Buffer Placing in Critical Chain Management based on CPM Network

关键链管理作为作为项目管理的新一代技术为项目管理提供了新的工具———缓冲区,研究人员可以利用缓冲区结合应用广泛的甘特图技术和CPM网络技术来研究非确定工期项目的管理,这使得原有理论的可移植性大为增强。然而在关键链缓冲区的研究中,汇入缓冲区计算对象即汇入链的定义一直没有明确的界定,这使得缓冲区的计算存在随意性;在工序前后逻辑关系相对复杂的情况下汇入链的识别就成为一个难点。论文对汇入链的识别和汇入缓冲设置问题展开研究,首先根据汇入链的本质对汇入链进行了定义,并利用CPM网络机动时间的性质给出了汇入链的识别的一般方法。其次研究了CPM双代号网络中缓冲区设置问题,并通过添加带有时间参数的缓冲节点解决了缓冲区的表示问题。最后论文通过算例对基于CPM网络对关键链汇入缓冲区设置的步骤进行说明。

As new generation technology of project management, Critical chain management provides new tool named buffer for management. Researchers could study project management with uncertain duration by using buffer and combining Gantt graph and CPM network technologies which have been applicated widely, and it could enhanced portability of original theory greatly. But feeding chain is the calculation object of feeding buffer, the definition of feeding chain has not been clearly defined in the study of buffer placing in critical chain method. This makes the existence of arbitrariness in the calculation of feeding buffer. The feeding chain identification becomes a problem when the logic relations of activities are relatively complex in network. The paper studies issues feeding chain identifications and buffer placing. First, feeding chain is clearly defined according to the nature of the feeding chain, and a method for finding feeding chain is proposed using the property of float in CPM network. Second, buffer placing in CPM activity on arrow network is studied, and the problem of buffer expression in CPM network is solved through adding buffer node with time parameter. Finally, an example is given to demonstrate steps of feeding buffer placing in CPM network.