A review of mobility metrics for next generation vehicle mobility models
Technical Report,01 Jan 2019,30 Aug 2019
U.S. ARMY CCDC GVSC WARREN United States
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In the United States, the NATO Reference Mobility Model NRMM has been used for evaluating military ground vehicle mobility and the Vehicle Cone Index VCI has been selected as a mobility metric. VCI represents the minimum soil strength required for a vehicle to consistently make a specific number of passes, usually one or fifty passes. In the United Kingdom the Mean Maximum Pressure MMP has been adopted as a metric for assessing military vehicle cross-country mobility. MMP is the mean value of the maxima occurring under all the wheel stations of a vehicle. Both VCI and MMP are empirically based. They have inherent limitations, such as the uncertainty whether the empirical relations for estimating the values of VCI and MMP can be extrapolated beyond the test conditions upon which they were based. This paper presents a review of the issues related to the basis upon which VCI and MMP were developed, as well as their applications to evaluating vehicle mobility in practice. With the progress in terramechanics and in modelling and simulation techniques in recent years, there is a growing desire to develop physics-based mobility metrics for next generation vehicle mobility models. Based on the review, criteria for selecting physics-based mobility metrics are proposed. Following these criteria, metrics for characterizing military vehicle traction capability limits and traversability on a given operating area are recommended.
- Surface Transportation and Equipment
- Soil Mechanics