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52 results on '"Mohamed Kamel"'

13. Measurement and Modeling of Tire Forces on a Low Coefficient Surface

Author

Gary J. Heydinger, Mohamed Kamel Salaani, and Paul A. Grygier

Subjects
Surface (mathematics), Engineering, business.industry, Process (computing), Mechanical engineering, National Advanced Driving Simulator, Tire uniformity, business, Automotive engineering
Abstract

There exists a fairly extensive set of tire force measurements performed on dry pavement. But in order to develop a lowcoefficient of friction tire model, a set of tire force measurements made on wet pavement is required. Using formulations and parameters obtained on dry roads, and then reducing friction level to that of a wet road is not sufficient to model tire forces in a high fidelity simulation. This paper describes the process of more accurately modeling low coefficient tire forces on the National Advanced Driving Simulator (NADS). It is believed that the tire model improvements will be useful in many types of NADS simulations, including ESC and other advanced vehicle technology studies.

Published
2006

15. Vehicle On-Center Directional and Steering Sensitivity

Author

Paul A. Grygier, Gary J. Heydinger, and Mohamed Kamel Salaani

Subjects
Physics, media_common.quotation_subject, Path (graph theory), Small deviations, Measure (physics), Fidelity, Distracted driving, Closed loop simulation, Sensitivity (control systems), Stability (probability), Simulation, media_common
Abstract

Steering activity in response to. deviations from the intended straight-ahead vehicle path is an important factor of vehicle-driver on-center performance. Traditionally, setting the parameters of vehicle models for stability analysis does not involve vehicle properties that make the vehicle deviate from its intended path with no steering input. However, for closed loop simulations where driver steering activity is considered a fundamental human performance measure, the ability of the vehicle model to faithfully generate path deviations in response to external forces is required for steering performance measures fidelity. Path deviations cause the driver to make small steering angle corrections to keep the vehicle on its intended straight path. It is in fact a natural driving load that should be included in every closed loop simulation before considering any study involving driving loads and driver distractions. This paper explains the physics of these small deviations and proposes a model that mimics path deviations seen on the road. A comparison is made between vehicle road data measurements and simulation results.

Published
2005

16. Closed Loop Steering System Model for the National Advanced Driving Simulator

Author

Mohamed Kamel Salaani, Gary J. Heydinger, and Paul A. Grygier

Subjects
Engineering, Hardware_MEMORYSTRUCTURES, ComputingMethodologies_SIMULATIONANDMODELING, business.industry, law.invention, Vehicle dynamics, Direct torque control, law, Control theory, Physics::Accelerator Physics, National Advanced Driving Simulator, Torque, Astrophysics::Earth and Planetary Astrophysics, Power steering, Torque steering, business, Damping torque, Reference model, Simulation, ComputingMethodologies_COMPUTERGRAPHICS
Abstract

This paper presents the details of the model for the physical steering system used on the National Advanced Driving Simulator. The system is basically a hardware-in-the-loop (steering feedback motor and controls) steering system coupled with the core vehicle dynamics of the simulator. The system's torque control uses cascaded position and velocity feedback and is controlled to provide steering feedback with variable stiffness and dynamic properties. The reference model, which calculates the desired value of the torque, is made of power steering torque, damping function torque, torque from tires, locking limit torque, and driver input torque. The model also provides a unique steering dead-band function that is important for on-center feel. A Simulink model of the hardware/software is presented and analysis of the simulator steering system is provided.

Published
2004

17. Experimental Steering Feel Performance Measures

Author

Mohamed Kamel Salaani, Paul A. Grygier, and Gary J. Heydinger

Subjects
Engineering, business.industry, Frequency domain, Steering system, medicine, Torque, Stiffness, medicine.symptom, business, Transfer function, Simulation
Abstract

This paper discusses techniques for estimating steering feel performance measures for on-center and off-center driving. Weave tests at different speeds are used to get on-center performances for a 1994 Ford Taurus, a 1998 Chevrolet Malibu, and a 1997 Jeep Cherokee. New concepts analyzing weave tests are added, specifically, the difference of the upper and lower curves of the hysteresis and their relevance to driver load feel. For the 1997 Jeep Cherokee, additional tests were done to determine steering on-center transition properties, steering flick tests, and the transfer function of handwheel torque feel to handwheel steering input. This\ transfer function provides steering system stiffness in the frequency domain. The frequency domain analysis is found to be a unique approach for characterizing handwheel feel, in that it provides a steering feel up to maximum steering rate possible by the drivers.

Published
2004

18. Evaluation of Heavy Tractor-Trailer Model used in the National Advanced Driving Simulator

Author

Paul A. Grygier, Mohamed Kamel Salaani, and Gary J. Heydinger

Subjects
Engineering, business.industry, National Advanced Driving Simulator, Tractor trailer, Instrumentation (computer programming), business, Automotive engineering, Simulation, Pulse (physics)
Abstract

This paper evaluates the heavy tractor-trailer handling dynamics model used in the National Advanced Driving Simulator. The comparison between simulation and experiments were done using lane change, slowly increasing steer, pulse steer, step steer, and straight-line braking maneuvers. The paper discusses tractor-trailer instrumentation and the results offield experiments.

Published
2003

19. Heavy Tractor-Trailer Vehicle Dynamics Modeling for the National Advanced Driving Simulator

Author

Mohamed Kamel Salaani, Gary J. Heydinger, and Paul A. Grygier

Subjects
Tractor, Vehicle dynamics, Engineering, business.product_category, Chassis, business.industry, Real-time Control System, Aerodynamic drag, Brake fade, National Advanced Driving Simulator, business, Suspension (vehicle), Automotive engineering
Abstract

This paper presents the development of a real-time vehicle dynamics model of the heavy tractor-trailer combination used in the National Advanced Driving Simulator. The model includes multi-body dynamics of the tractor andtrailer chassis, suspension, and steering mechanisms. The rigid body model is formulated using recursive multi-body dynamics code. This model is augmented with subsystem models that include tires, leaf springs, brakes, steering system, and aerodynamic drag. This paper also presents parameter measurement and estimations used to set up the model. Also included are models for brake fade, steering torque resistance, and defective tires.

Published
2003

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