论文部分内容阅读
网络计划的网络时差表示各工序实际可用的机动时间的总和（不是理论上机动时间的简单加总）,即CPM网络计划的总机动时间,它决定着在总工期不变的前提下,所有工序实际可以达到的最大工期的总和,与工程项目的成本密切相关.网络时差是变量,与各工序的时间参数相关,说明可以通过调整工序的时间参数决定该时差的取值,进而实现成本优化,但目前还无法确定其变动幅度.首先从新的角度分析了网络时差的含义;然后,在此基础上建立了求解网络时差的模型,确定了网络时差的变动范围（即确定其最大值和最小值）,以及为了实现网络时差的最值各工序需满足的时间参数值;最后,通过算例阐述其应用.“,”Network float of network planning denotes sum of floats which could be consumed practically by each activity,and isn＇t the simple sum of floats in theory.Network float determines sum of the maximal reachable durations of all activities in pracrice under condition of fixed total duration,and is correlative close to cost of project engineering.The network float is variable,and is correlative to time parameters of each activity.It illuminates that value of the float could be decided by adjusting time parameters of activities,and then realizes optimization of cost;but variational extent of the float has not been confirmed now.In this paper,firstly,meanings of network float is analyzed from new visual angle;secondly,model of computing network float is founded base on above meanings,variational extent of the float viz.maximum and minimum are confirmed,and time parameters of each activity which should be satisfied for obtaining the maximun and minimum of network float are also confirmed;finally,case study is used to expound the application.