OPTIMIZING EARTH MOVING PLANT: SOLUTION FOR THE EXCAVATOR-TRUCKS SYSTEM
THE PAPER REPORTS A CONVENIENT GRAPHICAL SOLUTION FOR THE OPTIMIZATION OF AN EXCAVATOR-TRUCK EARTHMOVING SYSTEM BY CONSIDERING IT AS A CYCLIC QUEUING SYSTEM. FOUR DIFFERENT SITUATIONS ARE ANALYZED WITH REFERENCE TO THE VARIABILITY OF THE SERVICE TIME OF THE EXCAVATOR AND THE TRANSIT TIME OF THE TRUCKS: CONSTANT SERVICE TIME AND CONSTANT TIME (A FIGURE ILLUSTRATES REGIONS OF OPTIMAL N); RANDOM (NEGATIVE EXPONENTIALLY DISTRIBUTED) SERVICE TIME AND RANDOM TRANSIT TIME; CONSTANT SERVICE TIME AND RANDOM TRANSIT TIME; AND RANDOM SERVICE TIME AND CONSTANT TRANSIT TIME. THE PROBLEM IS STATED AND ILLUSTRATED DIAGRAMATICALLY. MATHEMATICAL SOLUTIONS ARE PRESENTED FOR THE FIRST THREE SITUATIONS AND THE SOLUTION OF THE FOURTH SITUATION IS OBTAINED VIA SIMULATION. THE OPTIMUM NUMBER OF TRUCKS IS DETERMINED AS A FUNCTION OF TWO RATIOS--COST PER HOUR OF EXCAVATOR/COST PER HOUR OF TRUCK AND TRANSIT TIME/SERVICE TIME. THE UNIT COSTS OF EARTHMOVING ARE OBTAINED AS A FUNCTION OF TRANSIT TIME/SERVICE TIME AND THE OPTIMUM NUMBER OF TRUCKS, N. HERE IS A POINT AT WHICH OPTIMAL VALUES OF N ARE INDEPENDENT OF THE VARIABILITY OF SERVICE AND TRANSIT TIMES. THIS GRAPHICAL SOLUTION IS SIMPLE AND EXPEDIENT FOR USE BY THE MAN AT THE SITE.
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Availability:
- Find a library where document is available. Order URL: http://worldcat.org/isbn/0309021871
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Supplemental Notes:
- Publication of this paper sponsored by Committee on Construction Management. Distribution, posting, or copying of this PDF is strictly prohibited without written permission of the Transportation Research Board of the National Academy of Sciences. Unless otherwise indicated, all materials in this PDF are copyrighted by the National Academy of Sciences. Copyright © National Academy of Sciences. All rights reserved.
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Authors:
- CABRERA, J G
- MAHER, M J
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Conference:
- 52nd Annual Meeting of the Highway Research Board
- Location: Washington District of Columbia, United States
- Date: 1973-1-22 to 1973-1-26
- Publication Date: 1973
Media Info
- Media Type: Digital/other
- Features: Figures; References;
- Pagination: pp 7-15
- Monograph Title: Construction
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Serial:
- Highway Research Record
- Issue Number: 454
- Publisher: Highway Research Board
Subject/Index Terms
- TRT Terms: Costs; Earthwork; Excavations; Graphics; Optimization; Service time; Simulation; Trucks
- Old TRIS Terms: Cycles; Graphic methods
- Subject Areas: Construction; Finance; Highways; Motor Carriers;
Filing Info
- Accession Number: 00215686
- Record Type: Publication
- ISBN: 0309021871
- Files: TRIS, TRB
- Created Date: Jun 5 1974 12:00AM