levelling.resources {ProjectManagement}

Project resource levelling

Description

This function calculates the schedule of the project so that the consumption of resources is as uniform as possible.

Usage

levelling.resources(
  duration,
  prec1and2 = matrix(0),
  prec3and4 = matrix(0),
  resources,
  int = 1
)

Arguments

duration

Vector with the duration for each activity.

prec1and2

A matrix indicating the order of precedence type 1 and 2 between the activities (Default=matrix(0)). If value (i,j)=1 then activity i precedes type 1 to j, and if (i,j)=2 then activity i precedes type 2 to j. Cycles cannot exist in a project, i.e. if an activity i precedes j then j cannot precede i.

prec3and4

A matrix indicating the order of precedence type 3 and 4 between the activities (Default=matrix(0)). If value (i,j)=3 then activity i precedes type 3 to j, and if (i,j)=4 then activity i precedes type 4 to j. Cycles cannot exist in a project, i.e. if an activity i precedes j then j cannot precede i.

resources

Vector indicating the necessary resources for each activity per period of time.

int

Numerical value indicating the duration of each period of time (Default=1).

Details

The problem of leveling resources takes into account that in order for activities to be carried out in the estimated time, a certain level of resources must be used. The problem is to find a schedule that allows to execute the project in the estimated time so that the temporary consumption of resources is as level as possible.

Value

A solution matrices.

References

heg

Hegazy, T. (1999). Optimization of resource allocation and leveling using genetic algorithms. Journal of construction engineering and management, 125(3), 167-175.

Examples

duration<-c(3,4,2,1)
resources<-c(4,1,3,3)
prec1and2<-matrix(c(0,1,0,0,0,0,0,0,0,0,0,1,0,0,0,0),nrow=4,ncol=4,byrow=TRUE)

levelling.resources(duration,prec1and2,prec3and4=matrix(0),resources,int=1)