SAE TECHNICAL PAPER SERIES Flexible Body Dynamic Simulation of a Large Mining Truck Walter E. Lohmann and Paul D. Fotsch Caterpillar Inc. The Engineering Society (CIA =For Advancing Mobility and Sea Air and Space, 45th Annual Earthmoving Industry Conference Peoria, Illinois April 12 & 13,1994 400 Commonwealth Drive, Warrendale, PA 15096-0001 U.S.A. Tel: (412)776-4841 Fax:(412)776-5760 Downloaded from SAE International by University of Birmingham, Monday, August 20, 2018The appearance of the ISSN code at the, bottom of this page indicates SAE's consent that copies of the paper may be made for personal or internal use of specific clients. This consent is given on the condition, however, that thecopierpaya$5.00perarticle (copy fee through the Copyright Clearance Center, Inc. Operations Center, 222 Rosewood Drive, Danvers, MA 01 923florcopying beyond that permitted by Sections 107 or 108 of the U.S. Copyright Law. This consent does not extend to other kinds of copying such as copying for general distribution, for advertising or promotional purposes, for creating new collective works, or for resale. SAE routinely stocks printed papers lor a period of three years following date of publication. Direct your orders to SAE Customer Sales and Satisfaction Department. Quantity reprint rates can be obtained from the Customer Sales and Satisfaction Department. To request permission to reprint a technical paper or permission to use copyrighted SAE publications in other works, contact the SAE Publications Group. All SA E papers, standards, and selected books are abstract6d and indexed in the Global Mobility Datnbase. No part of this publication may by reprod~lced in any form, in an electronic retrieval system or otherwise, without the prior written permission of the publisher. ISSN 0148-7191 Copyright 1994 Society of Automotlve Englneers, Inc. Positions and opinions advanced in this \paper are those of the author@) and not necessarily those of SAE. The author is solely responsible for the content of the paper. A process is available by which di.scussions will be printed with the paper if It is published in SAE transactions. For ptsrmission to publish this paper in full or in pa12, contact the SAE Publications Group. Persons wishing to submit papers to be oonsidered for presentation or publication through SAE should send the manuscript or a 300 word abstract of a proposed manuscript to: Secretary, Engineering Aclvity Board, SAE. Printed in USA 901203c/w Downloaded from SAE International by University of Birmingham, Monday, August 20, 2018Flexible Body Dynamic Simulation of a Large Mining Truck Walter E. Lohmann and Paul D. Fotsch Caterpillar Inc. ABSTRACT A three dimensional mathematical model of a Caterpillar mining truck has been developed to simulate transient structural deformation and suspension response of a large mining truck traversing a known rough terrain course. The model incorporates compliant (finite element) representa- tions of the truck frame, dump body, and rear axle housing into a dynamic mechanical system simulation model. Model results - frame acceleration, axle housing elastic deformation, and suspension response (strut pressures and displacements) are correlated with measured data from an instrumented truck traversing the steel speed bump portion of the rough terrain course. Results demonstrate that complex truck behavior can be simulated by combining finite element and mechanical system simulations. INTRODUCTION Product development strategies in many major indus- tries today rely to varying degrees upon computer simula- tion to evaluate and rank alternative designconcepts. Such simulations permit product development cycles to be short- ened by minimizing the number of costly and time consum- ing prototype "build -test - redesign - rebuild" iterations. For large complex machinery these iterations might be measured in months and cost many thousands of dol