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Estimating Off-Road Ground Contact Forces for a Real Time Motion Simulator
Technical Paper
2004-01-2643
ISSN: 0148-7191, e-ISSN: 2688-3627
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English
Abstract
Researchers at the US Army Engineer Research and Development Center (ERDC), working in the field of vehicle mobility, have developed methods to predict the physical interactions of vehicles with soil surfaces. This set of methods use research conducted at the ERDC over the last 40 years to predict the physical interactions of vehicles and terrain surfaces under all seasons. Methodologies to measure pertinent terrain properties and assess vehicle performance have also been developed. Much of the work focused on practical applications and is the result of extensive vehicle performance testing and the subsequent analysis of the test results. While there have been attempts to identify and characterize soil media properties using standard soil classification techniques and to assess their effects on vehicle mobility using classical soil mechanics and other theoretical approaches, the current state-of-the-art is such that these approaches have limited practical application. The ERDC's approach has been to quantify and relate a set of fundamental vehicle traction element performances to easily obtainable terrain properties. This empirical and lumped parameter approach has provided relevant and verifiable results for decades, but due to its nature, is difficult to extrapolate and manipulate mathematically. Nevertheless, the ease of obtaining suitable terrain properties, its historical success in vehicle performance predictions, and its maturity and broad validation database have made it an attractive choice for implementation into a simulated terrain mechanics model for real time dynamics vehicle simulators.
This paper describes the algorithms selected for estimating longitudinal force coefficients for soils (frozen and non-frozen), snow, and ice, and the underlying assumptions.
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Richmond, P., Jones, R., Creighton, D., and Ahlvin, R., "Estimating Off-Road Ground Contact Forces for a Real Time Motion Simulator," SAE Technical Paper 2004-01-2643, 2004, https://doi.org/10.4271/2004-01-2643.Also In
Advancements in Air Brake Systems, Truck Suspensions and Military Vehicle/Terrain Interface
Number: SP-1905; Published: 2004-10-26
Number: SP-1905; Published: 2004-10-26
References
- Brudnak, M Nuñez P. Reid A. 2002 Real-time, Distributed, Unmanned Ground Vehicle Dynamics and Mobility Simulation SAE paper 2002-01-1178
- USACE 1947 Trafficability of Soils, Pilot Tests-Self-propelled Vehicles USACE WES Technical Memorandum 3 240
- USACE 1948 Trafficability of Soils Laboratory Tests to Determine Effects of Moisture Content and Density Variations USACE WES Technical Memorandum 3 240
- US Army 1959 Soils Trafficability Headquarters Department of the Army
- Blaisdell, G.L. Richmond P.W. Shoop S.A. Green C.E. Alger R.G. 1990 Wheels and Tracks in Snow, Validation Study of the CRREL Shallow Snow Mobility Model USA Cold Regions Research and Engineering Laboratory Hanover NH CRREL Report 90-9
- Richmond, P.W. Blaisdell G.L. Green C.E. 1990 Wheels and Tracks in Snow, Second Validation Study of the CRREL Shallow Snow Mobility Model USA Cold Regions Research and Engineering Laboratory Hanover NH CRREL Report 90-13
- Green, C.E. Blaisdell G.L. 1991 US Army Wheeled Versus Tracked Vehicle Mobility Performance Test Program USACE WES Technical Report GL-91-7
- Richmond, P.W. 1995 Motion Resistance of Wheeled Vehicles in Snow U.S. Army Cold Regions Research and Engineering Laboratory CRREL Report 95-7
- Ahlvin, R.B Shoop S.A. 1995 Methodology for Predicting for Winter Conditions in the NATO Reference Mobility Model Proceedings of the 5th North American International Society for Terrain Vehicle Systems Conference Saskatoon, SK, Canada
- Shoop, S.A. Coutermarsh B. Reid A. 2004 All-Season Virtual Test Site for a Real-Time Vehicle Simulator SAE paper 2004-01-2644