This paper presents the application of Buckingham’s π theorem to scale the powertrain of a High Mobility Multipurpose Wheeled Vehicle (HMMWV) by deriving non dimensional ratios called π parameters. A Hardware In the Loop (HIL) setup is constructed and the resulting longitudinal dynamics of the scaled vehicle are validated against those of a full scale vehicle model. This is performed with the u...

A control scheme for the coordinated control of a Sub-sea vehicle/manipulator system is presented. The unit quaternion representation is used in a singularity free representation of the attitude. The control scheme is formulated in a 12 d.o.f. task space and only position measurements are required. The performance is evaluated by simulation with a realistic model of a commercial underwater vehi...

This paper demonstrates a new process that has been specifically designed for the support of the U.S. Department of Transportation’s (DOT’s) Corporate Average Fuel Economy (CAFE) standards. In developing the standards, DOT’s National Highway Traffic Safety Administration made use of the CAFE Compliance and Effects Modeling System (the "Volpe model" or the “CAFE model”), which was developed by D...

A Functional Virtual Prototyping full vehicle model for a tri-axial heavy-duty truck is built, and the nonlinearity of suspension dampers and tires is also considered. With the trajectory of full vehicle gravity center, longitudinal tire force of front wheel, longitudinal acceleration, lateral acceleration, yaw rate and pitch angle as the evaluation indexes of brake property, the influences of ...

This paper dis cusses the development of a nonlinear shock absorber model for low-frequency CAE-NVH applications of body-on-frame vehicles. In CAE simulations, the shock absorber is represented by a linear damper model and is found to be inadequate in capturing the dynamics of shock absorbers. In particular, this model neither captures nonlinear behavior of shock absorbers nor distinguishes bet...

In this paper, the problem of comfort and handling improvements of a ground vehicle is treated through the joint control of the suspension and braking systems. Two H∞ gain-scheduled controllers are synthesized to achieve, attitude and yaw performances according to the driving situation, observed through of a simple vehicle monitor. The proposed strategy tackles the nonlinear tire braking force ...

This paper presents a synthesis of a robust control for an autonomous underwater vehicle (AUV) using two different methods. The problem statement requires the design of a position and attitude control system for the vehicle such that robust trajectory following is achieved. A detailed nonlinear model of the vehicle was derived, an operating point for nominal design was selected, and a multivari...

For a flexible air-breathing hypersonic vehicle model, this paper is concerned with the application of linear control theory to address its complex control problem over wide range of flight conditions. Because of the complexity of the numerical nonlinear model of the vehicle dynamics, a curve-fitted model in closed form is created. Based on the analytical model, a linear parameter-varying (LPV)...

In the vehicle speaker, because the sound characteristics are changed by the space of vehicle which mount the speaker, the speaker elements should be determined according to sound field. In this study, the nonlinear characteristics, the frequency response and the sound pressure for the same size speakers which is adapted to domestic vehicle model are investigated. The vehicle model is classifie...