Elevatoring experts now review simulation results, as well as calculated results, to evaluate elevator systems. The elevator industry now routinely expects elevator manufacturers to provide elevator simulation results as part of the bid process for both new equipment and modernization jobs. Over the past two decades, elevator simulation programs, programs that duplicate elevator behavior using sophisticated computer programs, have become increasingly common. Although there may be slight variations among implementations, similar results are produced when similar inputs are employed, and significant differences in a calculated value can usually be easily explained by a difference in the relevant inputs. Round trip time formulas and handling capacity equations are well documented (Examples include Barney 2010 Barney and dos Santos 1985, and Strakosch 1967). The relevant formulas, based on elevator round trip calculations, are mathematically straight forward, widely available, accepted in both commercial and academic settings and can be executed with a piece of paper and pencil, a calculator or a simple computer program or spreadsheet implementation. Elevator experts review the calculated values and compare them to industry norms to evaluate the quality of the proposed elevator system. Introductionįor over 90 years, the elevator industry has used probability formulas to calculate how many people can be handled by a given elevator system configuration. This paper discusses how elevator simulators use traffic patterns, the impact of traffic variation on simulated elevator performance metrics, and shows that, unlike traditional handling capacity calculations, elevator simulation does not automatically “average out” the effects of traffic variability. Performance variation is inherent to elevator dispatching because one of the key inputs to dispatching analysis, the relevant traffic, varies day to day, hour to hour, and even minute to minute. Key Words: Simulation, elevator traffic, dispatching, waiting time Abstract (website: This paper is an exact reprint and has not been edited by ELEVATOR WORLD. It is a reprint with permission from the International Association of Elevator Engineers USA 2012, the International Congress on Vertical Transportation Technologies and first published in IAEE book Elevator Technology 19, edited by A.
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