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Experimental Estimation of On-Vehicle Wheel-End Force and Application to Tire Flat-Spotting Effect
Technical Paper
2009-01-2160
ISSN: 0148-7191, e-ISSN: 2688-3627
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English
Abstract
Nibble is torsional vibration at the steering wheel of a vehicle. Typically it occurs at a resonant frequency of the steering and suspension system excited by the 1st harmonic tire/wheel force. A nibble target is established to be consistent with customer satisfaction target and then cascaded down to the targets for vehicle nibble sensitivity and tire/wheel inputs. Hence accuracy of the sensitivity and the tire/wheel force is important for a Computer Aided Engineering (CAE) nibble simulation. On-vehicle wheel-end forces are fore/aft and vertical tire/wheel forces acting on a vehicle spindle in an operating condition. This paper presents a methodology to estimate the wheel-end forces. The methodology was applied to investigate the effect of the tire flat-spot on the wheel-end forces. Tires were flat-spotted for one week and two months to simulate customer usage profiles. They were tested to measure the growth of the wheel-end forces. Finally, tires of the vehicles in a dealer lot were also tested with known “time-on-lot”. The new measurement that reflected a statistical distribution of the flat-spotted wheel-end forces improved the CAE load case for the nibble simulation and correlated “time-on-lot” to the nibble warranty.
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Park, J., McKee, M., and Mouch, T., "Experimental Estimation of On-Vehicle Wheel-End Force and Application to Tire Flat-Spotting Effect," SAE Technical Paper 2009-01-2160, 2009, https://doi.org/10.4271/2009-01-2160.Also In
References
- Neureder, U. “Investigation into Steering Wheel Nibble” Proceedings of Institution of Mechanical Engineers 216 267 277 2002
- Park, J. Gu, P. Juan, J. Ni, A. Van Loon, J. “Operational Spindle Load Estimation Methodology for Road NVH Applications” SAE Noise and Vibration Conference and Exposition , 2001-01-1606 2001
- Park, J. Gu, P. Lee, M. Ni, A. “A New Experimental Methodology to Estimate Tire/Wheel Blocked Force for Road NVH Application” SAE Noise and Vibration Conference and Exposition , 2005-01-2260 2005