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- W588766144 abstract "THIS STUDY WAS MADE TO DEFINE AND FORMULATE THE PROCEDURES FOR IMPLEMENTING A PRACTICAL, COMPACT DESCRIPTION OF TERRAIN-VEHICLE-SPEED (TVS) SYSTEMS AND ESTABLISH A METHODOLOGY FOR RELATING MEASURES OF RIDE TO MEASURES OF TERRAIN ROUGHNESS AND CROSS-COUNTRY SPEED. THIS METHODOLOGY SHOULD ENABLE THE DETERMINATION OF RELIABLE ESTIMATES OF THE AVERAGE SPEED A GIVEN VEHICLE CAN ATTAIN UNDER GIVEN VIBRATIONAL CONSTRAINTS AS WELL AS THE PROBABILITIES OF EXCEEDING CERTAIN SPECIFIED LEVELS. THIS STUDY WAS ENTIRELY A COMPUTERIZED EFFORT. DIGITAL COMPUTER SIMULATIONS WERE CONDUCTED IN WHICH A VEHICLE WAS RUN AT SEVERAL SELECTED SPEEDS OVER TERRAIN PROFILES WITH VARIOUS LEVELS OF ROUGHNESS. THE TERRAIN PROFILES WERE GENERATED BY COMPUTER PROGRAMS THAT CONSTRUCTED AND SHAPED SEQUENCES OF RANDOM NORMAL NUMBERS TO PROVIDE REPRESENTATIVE PROFILES WITH A DESIRED POWER SPECTRUM, VARIANCE, MEAN VALUE, STANDARD DEVIATION, AND ROOT MEAN SQUARE (RMS). THESE PROGRAMS ALSO PERFORMED THE NECESSARY STATISTICAL CHECKS FOR NORMALITY, STATIONARITY, AND RANDOMNESS. A COMPREHENSIVE, NONLINEAR MATHEMATICAL MODEL OF AN M37 TRUCK SERVED AS THE VEHICLE. THIS MODEL ALLOWED FOR THE NONLINEARITIES INHERENT IN LARGE ROTATIONAL MOTIONS, THE SUSPENSION ELEMENTS, BUMP STOP, LOSS OF GROUND CONTACT, AND THE TIRE COMPLIANCE, WHICH WAS REPRESENTED BY A CLUSTER OF RADIALLY PROJECTING SPRINGS. THE RESULTS ARE PRESENTED IN THE FORM OF THREE BASIC GRAPHS COMPARING INPUT AND OUTPUT STATISTICS AND DISTRIBUTION FUNCTIONS. THE INPUT STATISTICS CONSISTED OF TERRAIN ROUGHNESS AS MEASURED BY RMS ELEVATION. THE OUTPUT IS REPRESENTED AS THE RMS VERTICAL ACCELERATION OF THE VEHICLE'S CENTER OF GRAVITY. A FAMILY OF CURVES WAS DEVELOPED RELATING VEHICLE RESPONSE TO TERRAIN ROUGHNESS FOR EACH SPEED OF VEHICLE TRAVERSAL. CROSS PLOTS OF THESE ESTABLISHED RELATIONS PROVIDED A MORE USEFUL RELATION BETWEEN VEHICLE RESPONSE AND SPEED FOR VARIOUS DEGREES OF TERRAIN ROUGHNESS. THE USE OF SUCH RELATIONS TO CATALOG VEHICLES IN TERMS OF THEIR RIDE DYNAMICS CAPABILITIES IS SUGGESTED. THE TVS SCHEME IS READILY ADAPTABLE TO COMPUTER MODELS FOR EVALUATING AND RATING THE CROSS-COUNTRY MOBILITY CHARACTERISTICS OF VEHICLES TRAVERSING LARGE, NONHOMOGENEOUS TERRAIN AREAS. /AUTHOR/" @default.
- W588766144 created "2016-06-24" @default.
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- W588766144 date "1971-04-01" @default.
- W588766144 modified "2023-09-27" @default.
- W588766144 title "DYNAMICS OF WHEELED VEHICLES: A STATISTICAL ANALYSIS OF TERRAIN-VEHICLE-SPEED SYSTEMS" @default.
- W588766144 hasPublicationYear "1971" @default.
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