Suspension Parameter Measurement Using Side-Pull Test To Enhance Modeling of Vehicle Roll 1999-01-1323
This paper describes a new laboratory test facility for measuring suspension parameters that affect rollover. The Side-Pull mechanism rolls the test vehicle through a cable attached rigidly at its center of gravity (CG). Changes in wheel camber and wheel steer angles are measured as a function of body roll angle. The roll test simulates a steady-state cornering. Thus, both compliance and kinematic forces are fed simultaneously to the vehicle as they would be applied in a real cornering situation. The lateral load transfer, and roll angle as a function of simulated lateral acceleration is determined.
The Side-Pull Roll Measurement has advantages over the conventional roll tests where the rolling force couple is applied vertically. The Side-Pull mechanism rolls the vehicle in a unrestricted way with horizontal forces applied at the tire / pad contact and the CG location. Thus, the measurements take into account coupling of compliance with roll. The -Side-Pull method eliminates the need to run separate tests for suspension kinematics and compliance properties.
Description of the hardware and testing method is given. Results from the side-pull measurement for the 1997 Jeep Cherokee are compared with field test results and with conventional Suspension Parameter Measurement Device (SPMD) results. It is found that slow continuous side-pull test simulates closely the steady-state cornering. The results from superposition of kinematics and compliance are compared with the side-pull results. Recommendations are given for development of the Side-Pull Suspension Measurement Facility to make use of it in roll modeling.
Citation: Erdogan, L., Guenther, D., and Heydinger, G., "Suspension Parameter Measurement Using Side-Pull Test To Enhance Modeling of Vehicle Roll," SAE Technical Paper 1999-01-1323, 1999, https://doi.org/10.4271/1999-01-1323. Download Citation
Author(s):
Levent Erdogan, Dennis A. Guenther, Gary J. Heydinger
Affiliated:
The Ohio State University, SEA Inc.
Pages: 11
Event:
International Congress & Exposition
ISSN:
0148-7191
e-ISSN:
2688-3627
Also in:
Vehicle Dynamics and Simulation 1999-SP-1445, SAE 1999 Transactions - Journal of Passenger Cars-V108-6
Related Topics:
Center of gravity (CG)
Roll
Test procedures
Camber
Test facilities
Vehicle acceleration
Rollover accidents
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