By E. Kay, R Brown, G. Chandler and W. A. Davis (Auth.)
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Extra info for A Mathematical Model for Handling in a Warehouse
Clearly, the dimensions that minimise capital costs for a given volume are not the same as those that minimise handling costs. In order to obtain the dimensions that minimise total handling costs, including space costs, we must combine the expressions for space cost and handling effort. In the simplest case, that is the store layout by Method 2 of Chapter 4 and gangway layout as per Fig. 5) where r is the depth of the transverse gangway in Fig. 14. 1. In the preceding chapters we have described procedures to minimise handling effort within warehouses on the assumption that handling effort is a function of the average distance over which one unit has to be moved during the storage process.
C;AN / '/ i^K-^J V/Ä 4 '//. / Ά '//. GAh4GWAy 3WAV GA On these assumptions, the handling effort is again related to distance, along the three axis, provided that, once a cell is reached, any number of output units, up to the total contained in the cell, can be taken without further movement Of course, quantity picked does influence total handling effort, in the sense, that a picker taking, say, 5 units from a cell, will spend more time at that location, than if he takes only one unit. e. M/2, in terms of input units. Since it is a constant, it does not enter in any mathematical minimisation procedure.
On these assumptions, the handling effort is again related to distance, along the three axis, provided that, once a cell is reached, any number of output units, up to the total contained in the cell, can be taken without further movement Of course, quantity picked does influence total handling effort, in the sense, that a picker taking, say, 5 units from a cell, will spend more time at that location, than if he takes only one unit. e. M/2, in terms of input units. Since it is a constant, it does not enter in any mathematical minimisation procedure.