Research on Dynamic Facility Layout Problem of Manufacturing Unit Considering Human Factors

Table 4

Symbolic definitions of dynamic facility layout problems.

Index set
	Facility indicator		Facility location indicator
	Layout stage
Parameter variable
	The total number of facilities		The total number of layout stages
	The length of the facility		The width of the facility
	The height of the facility		The minimum lateral distance between facility and facility
	The minimum longitudinal distance between facility and facility		The minimum distance between facility and the wall in the -axis direction
	The minimum distance between facility and the wall in the -axis direction		The coordinate of the center of facility in the -th stage of layout
	The coordinate of the center of facility in the -th stage of layout		The lateral length of Manufacturing unit
	The longitudinal length of Manufacturing unit		The equivalent flow between the facilities and in the -th stage of layout
	The handling frequency between the facilities and in the -th stage of layout		The logistics costs per material per distance between the facilities and at any stage of layout
	The material handling distance between facility and facility in the -th stage of layout; that is,
	The facility movement costs in the stage of the layout to the next stage		The facility setup costs in the stage of the layout to the next stage
	The time required to move facility in the stage of the layout to the next stage		Production unit profitability available per unit of time
	Material handling costs		Unit reconstruction costs
	Production loss costs		Weights for Material handling costs
	Weights for Unit reconstruction costs		Weights for Production loss costs
	Manufacturing unit layout refactor total budget
Decision variables