A framework for generation of reliability-based stochastic off-road mobility maps is developed to support the next generation NATO reference mobility model (NG-NRMM) using full stochastic knowledge of terrain properties and modern complex terramechanics modeling and simulation capabilities. The framework is for carrying out uncertainty quantification (UQ) and reliability assessment for Speed Made Good and GO/NOGO decisions for the ground vehicle based on the input variability models of the terrain elevation and soil property parameters. To generate the distribution of the slope at given point, realizations of the elevation raster are generated using the normal distribution. For the soil property parameters, such as cohesion, friction, and bulk density, the min and max values obtained from geotechnical databases for each of the soil types are used to generate the normal distribution with a 99% confidence value range. In the framework, the ranges of terramechanics input parameters that will cover the regions of interest are first identified. Within these ranges of input parameters, a dynamic kriging (DKG) surrogate model is obtained for the maximum speed of the nevada automotive test center (NATC) wheeled vehicle platform complex terramechanics model. Finally, inverse reliability analysis using Monte Carlo simulation is carried out to generate the reliability-based stochastic mobility maps for Speed Made Good and GO/NOGO decisions. It is found that the deterministic map of the region of interest has probability of only 25% to achieve the indicated speed.
Framework of Reliability-Based Stochastic Mobility Map for Next Generation NATO Reference Mobility Model
Contributed by the Design Engineering Division of ASME for publication in the JOURNAL OF COMPUTATIONAL AND NONLINEAR DYNAMICS. Manuscript received May 23, 2018; final manuscript received August 21, 2018; published online January 7, 2019. Assoc. Editor: Radu Serban.This work was authored in part by a U.S. Government employee in the scope of his/her employment. ASME disclaims all interest in the U.S. Government's contributions.Distribution Statement A: Approved for public release; distribution unlimited. OPSEC#798.
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Choi, K. K., Jayakumar, P., Funk, M., Gaul, N., and Wasfy, T. M. (January 7, 2019). "Framework of Reliability-Based Stochastic Mobility Map for Next Generation NATO Reference Mobility Model." ASME. J. Comput. Nonlinear Dynam. February 2019; 14(2): 021012. https://doi.org/10.1115/1.4041350
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