Refine Your Search

Search Results

Viewing 1 to 5 of 5
Technical Paper

Procedure for the Characterization of Friction in Automobile Power Steering Systems

1996-02-01
960933
In developing a nonlinear steering system model for vehicle simulation, it was determined that proper inclusion of system friction is necessary to correctly predict steering wheel torque response in on-center driving using simulation models. A method to characterize the inherent friction behavior for a given steering gear has been developed and performed on two types of power steering gears: a recirculating ball gear and a rack-and-pinion gear. During this research it was discovered that levels of static and dynamic friction can differ widely for these two types. Therefore this characterization procedure provides a method to ascertain both static and dynamic friction levels. The results from these tests show that friction levels can depend on steering gear input shaft position, steering gear input angular velocity and steering gear loading conditions.
Technical Paper

Effects of Suspension Geometry and Stiffness Asymmetries on Wheel Loads During Steady Cornering for a Winston Cup Car

1996-12-01
962531
Tuning a race car for good handling requires accurate prediction of the tire normal loads and tire orientation as specified by steer and camber angles. This paper describes the development and examples of the application of computer models which have been developed to predict suspension geometry characteristics and wheel loads for Winston Cup cars running on banked tracks. Example cases are presented illustrating the effects of roll center movement front spring split different rates right to left), and cross weight percentage (wedge).
Technical Paper

Clemson University Motorsports Engineering Program

1996-12-01
962496
The newly initiated Clemson Motorsports Engineering Program, housed in the Department of Mechanical Engineering, provides unique educational opportunities to our students combining classroom engineering education, research, and race team experience. Additionally, the research and service projects conducted provide valuable information to race teams and companies in the automotive industry as well as involving students in both applied technology development and fundamental engineering activities. This paper describes the current activities and structure of the program together with our view for future development.
Technical Paper

An Investigation of the Pulse Steer Method for Determining Automobile Handling Qualities

1993-03-01
930829
The use of pulse steering tests for assessment of handling qualities was investigated using a simulation of a comprehensive, nonlinear four wheel model of an automobile. Evaluations were conducted using frequency response functions of yaw rate and lateral acceleration obtained by FFT processing of the simulated response. In addition, as suggested by the work of Mimuro et al [1], four parameters (steady state yaw rate gain, yaw rate natural frequency and damping ratio, and lateral acceleration phase lag at 1 Hz) that characterize these response functions were also obtained by curve fitting techniques. The effects on accuracy of the response functions and the four parameters of variations in pulse shape, duration, and magnitude were investigated. Results from the simulated pulse steer test were compared with those from simulated swept sine steering tests.
Technical Paper

A Feasibility Study of an Automotive Slip Control Braking System

1993-03-01
930762
This paper describes the simulation and evaluation of a slip control braking system (SCBS) using a comprehensive nonlinear, four-wheel model of an automobile. The controller was formulated to maintain longitudinal slip at a desired or target value that was automatically modified to account for lateral maneuvering requirements. A method is presented for calculating the desired slip using signals from currently available sensors. The performance of the SCBS controller and its effects on the dynamics of the car under combined braking and steering were compared to that of a car equipped with a peak-seeking anti-lock brake system. It was found that the SCBS system provided a large increase in overall braking performance compared to the peak seeking system.
X