Accommodation Models

Accommodation Model Cutaway

Military ground vehicle occupant workspaces are developed using guidance from MIL-STD-1472, the Department of Defense Design Criteria Standard: Human Engineering. Basic component dimensions and clearances given within the vehicle interior are meant to accommodate the central 90 percent of the target design population. The relation of these values to the body dimensions, postures, and clearance requirements of the occupant have been lost in many cases, so it is not possible to make allowances for changing user populations and levels of body borne gear. TARDEC, working in collaboration with the University of Michigan Transportation Research Institute (UMTRI), and the Army Research Laboratory Human Research and Engineering Directorate (ARL HRED), is developing graphical anthropometric design tools, referred to as accommodation models, that adjust automatically based on user inputs describing the target design population, desired accommodation level, and vehicle environment.

Ensuring that a given percentage of the population can sit safely and naturally in military ground vehicles while performing all required functions, including driving, requires multivariate analysis methods that consider the physical dimensions of the occupant (anthropometry) and behavioral effects (posture) in a three dimensional (3D) space. Empirical data of service members sitting in mockups of ground vehicle workstation environments, while wearing various clothing and equipment ensembles, was collected and analyzed by UMTRI to create the mathematical basis for the accommodation models. Because vehicle designs are developed from the early concept stages forward using Computer-Aided Design (CAD) software, this work was subsequently encoded by TARDEC into parametric CAD templates using PTC Creo®. Under the guidance of ARL-HRED, clearances between the occupant and surrounding interior surfaces and vision requirements have been layered onto the resulting 3D accommodation boundaries.


Technical Reports

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Scientific Basis for the Model

Through the Automotive Research Center, a U.S. Army Center of Excellence for Modeling and Simulation of Ground Vehicles, the University of Michigan conducted studies to develop statistical population accommodation models for Soldier accommodation in vehicles. This research is the basis for the suite of Computer-Aided Design (CAD) accommodation models being developed by the TARDEC Advanced Concepts Team (ACT). U of M documented the research in the reports listed below: