A Computer Simulation Model for Determining Fleet Size and Composition

1977 ◽  
Vol 99 (1) ◽  
pp. 157-161
Author(s):  
G. C. Schultz ◽  
E. E. Enscore
Keyword(s):  
Computer Simulation ◽  
Simulation Model ◽  
Search Algorithms ◽  
The Other ◽  
Hill Climbing ◽  
Computer Simulation Model ◽  
Fleet Size ◽  
Travel Costs ◽  
Total Vehicle ◽  
Vehicle Fleet

A heterogeneous vehicle fleet is one that is composed of several types of vehicles. The number of each type of vehicle in the fleet is called the fleet’s composition. The problem of determining the best fleet size and composition for an in-house heterogeneous company fleet having a known demand was solved in this paper. A computer model was developed which tied a fleet simulation model to two different search algorithms. One of the search algorithms is a complete factorial nonsequential search and the other is a combination of a partial factorial nonsequential search and a heuristic sequential hill-climbing search. The objective of both searches is to select the fleet size and composition which provides the lowest total vehicle travel costs to the company. Several examples were used to demonstrate the use of the model.

scholarly journals Twisting Techniques Used in Freestyle Aerial Skiing

1989 ◽  
Vol 5 (2) ◽  
pp. 275-281 ◽  
Author(s):  
Maurice R. Yeadon
Keyword(s):  
Computer Simulation ◽  
Simulation Model ◽  
Tilt Angle ◽  
Twist Angle ◽  
Computer Simulation Model ◽  
Winter Olympics

At the 1988 Calgary Winter Olympics, six triple somersaults with three twists or four twists were filmed using two cameras. Angles describing body configuration and orientation were determined and were used as input into a computer simulation model of aerial movement. It was found that the twist angle of each simulation deviated from the corresponding angle obtained from film by less than 0.08 revolutions during the first somersault of each movement. Contributions to the tilt angle after one somersault were determined using simulations based on modifications of the film data. It was found that of the six competitors, two initiated the twist during the takeoff phase, two initiated the twist during the aerial phase, and two used a combination of both methods.

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