Aldep Automated Layout Design Program
Module 7: COMPUTERISED LAYOUT PLANNING LAYOUT PLANNING PACKAGES • CONSTRUCTION PROGRAMS - CORELAP - ALDEP - PLANET, LSP, LAYOPT, RMA Comp I • IMPROVEMENT PROGRAMS - CRAFT - RUGR (based on graph theory) ALDEP AUTOMATED LAYOUT DESIGN PROGRAM Development within IBM Se ehof, J.M and W.O. Evans Automated Layout Design Program:, The Journal of Industrial Engineering, Vol 18, No.
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12, 1967, pp 690 - 695. ALDEP based on closeness Ratings A = 64 E = 16 I = 4 O = 1 U 0 = 0 X = -1,024 Scoring Pattern of ALDEP • For a Cell (0) the scores of all eight neighbours areadded together (as per REL chart) • Then the cell (0) is deleted so that it is not counted again.
We then proceed to the next cell till all cells are exhausted. The final cumulative score is the Layout Score 2 3 4 1 0 5 8 7 6. Inputs Requirements for ALDEP • Length, Width and area requirements for each floor. • Scale of layout printout (max 30x50) • No. In the layout • No. Of layouts to be generated • Minimum allowable score for an acceptable layout. • Minimum dept.
AUTOMATED LAYOUT DESIGN PROGRAM (ALDEP). Coordinate converter borneo rso. ALDEP is basically a construction algorithm, but it can also be used to evaluate two layouts. It uses basic.
Preference (A or E) • REL chart for the depts. • Location and size of restricted area for each floor. Vertical Scanning Pattern for placing depts. In ALDEP Mechanism of ALDEP (a) 1st dept placed randomly. (b) Scan the REL chart for a dept with A,E rating (min dept preference) continue this step till no such dept exists.
(c) Pick up the next dept. In a random fashion and again proceed by scanning the REL chart [step (b)].
Placement of 3rd Department Placement of 4th Department Final Layout Features of CORELAP • Retain the rectangular shape of each department. • The layout is built around a central department.
• Placement and choice based on the total and current placement ratio. • The final layout may end up with irregular boundaries.
CRAFT Computerized Relative Allocation of Facilities Technique Armour, G.C. And E.S.Buffa, A Heuristic Algorithm and Simulation Approach to Relative Location of Facilities Management Science, Vol 9, No.
1, 1963, pp 294-309 Buffa, E.S, G.C. Armour and T.E. Vollman Allocating Facilities with CRAFT Harvard Business Review, Vol 42, No.2, 1964, pp 136 - 159. Summary of the CRAFT procedure • This example demonstrates one iteration of the basic CRAFT procedure • The best layout so produced is compared with the starting layout. If it is inferior to the starting layout, the starting layout is declared optimal and the search stops • Otherwise a new iteration with the discovered layout as the starting node is initiated Conclusions • Computer packages for layout planning -Construction programs (ALDEP, CORELAP) -Improvement programs (CRAFT) • Based on SLP procedure -Activity relationships -Material Handling Effort • Good for generation of alternative layouts • Limitations of irregular shapes, ignoring realistic constraints.
Random selection process, Francis and White (1974, p. 102) Closeness ratings, Francis and White (1974, p. 102) Capabilities and limitations, Francis and White (1974, pp. 102-107) Input requirements, Francis and White (1974, p. 102) Layout scale, Francis and White (1974, p. 103) Layout scores, Francis and White (1974, pp.
103-104) Data input, Francis and White (1974, pp. 103-104) Solved numerical example, Francis and White (1974, pp. 105-107) Francis, Richard L.
And White, John A. Facilities Layout and Location, Prentice Hall, Englewood Cliffs, NJ, 1974. 2007-02-28 6:50 pm.