Abstract
Scrapers typically exhibit a nonlinear load-growth curve whereby the rate of loading (the slope of the load-growth curve )varies with the load time. Allowing a scraper to obtain a maximum load does not imply either maximum production or minimum cost per production Tor a fleet or scrapers operating in conjunction with a pusher tractor. The paper demonstrates this using, for the pusher-scraper operation, a queueing model that includes allowances Tor the variabilities in the pusher and scraper cycles as well as an allowance for the interaction among the scrapers. Field data are presented illustrating the variabilities and interaction present in pusher-scraper operations. Examples are given showing the computations involved in selecting the optimum scraper load time for maximum production or minimum cost per production of the operation. The solutions to the related problems firstly of simultaneously selecting the optimum load time and optimum scraper fleet size and secondly of choosing the optimal pusher capa...
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