This content is not included in your SAE MOBILUS subscription, or you are not logged in.
Subjective and Objective Quantification of Steady-State Idle Vibration Felt Through the Seat
ISSN: 0148-7191, e-ISSN: 2688-3627
Published May 05, 2003 by SAE International in United States
Annotation ability available
This research is the result of an effort to objectively quantify idle vibration felt at the seat during steady-state idle conditions. A previously used seat vibration metric using the root-sum-square (RSS) of vertical, lateral and longitudinal degrees-of-freedom (DOFs) measured at the seat base was found to not adequately describe the human perception of 34 test subjects (R2=0.63). Using the Ford vehicle vibration simulator, a new metric was developed. Thirty-four test subjects participated in a paired comparison study in which six-DOF (vertical, lateral, longitudinal, pitch, roll and yaw) simulations were reproduced from eight different vehicles. The stimuli used in the study spanned a wide range of vehicles, engine types and configurations. The paired comparison subjective results were used in a correlation of objective metrics. The resulting metric takes vibration measured at various locations of the seat base and projects these vibrations to the seat top. The seat top vibrations are then frequency weighted according to previously measured seat transmissibilities for vertical, lateral and longitudinal DOFs. Using non-linear regression, it was then determined that the RSS of the frequency-weighted and projected DOFs could adequately describe the impressions of the subjects if the vertical DOF is weighted more heavily as either lateral or longitudinal DOFs. This new metric better represents the actual vibration felt by customers and, as a result, produced a fit of R2=0.94 to the subjective data. A follow-on subjective experiment was then conducted to validate the new metric using five new data samples. The combined data set of 13 vehicles produced a linear fit of R2=0.84.
- Scott Amman - Ford Research and Vehicle Technology
- William Pielemeier - Ford Research and Vehicle Technology
- Ray Meier - Ford Research and Vehicle Technology
- Scott Bergeon - Ford Research and Vehicle Technology
- Nae-Ming Shiau - Ford Research and Vehicle Technology
- Alex Gorodisher - Ford Research and Vehicle Technology
CitationAmman, S., Pielemeier, W., Meier, R., Bergeon, S. et al., "Subjective and Objective Quantification of Steady-State Idle Vibration Felt Through the Seat," SAE Technical Paper 2003-01-1512, 2003, https://doi.org/10.4271/2003-01-1512.
- Meier R., Otto N., Pielemeier W. and Jeyabalan V., “A New Tool for the Vibration Engineer,” SAE Paper #971979, SAE Noise and Vibration Conference, Traverse City, MI, May 20-22, 1997.
- Meier R., Otto N., Pielemeier W. and Jeyabalan V., “The Ford Vehicle Vibration Simulator for Subjective Testing,” Sound and Vibration, Vol. 32, No. 5, May1998.
- David H., The Method of Paired Comparisons, Oxford University Press, NY, 1988.
- Chambers E. and Wolf M., “Sensory Testing Methods,” ASTM Manual Series: MNL 26, West Conshohocken, PA, 1996.
- Griffin M., “Handbook of Human Vibration,” Academic Press, London, 1990.