Investigation of Vibration Damping in the Passenger Seat Constructions

Abstract

Under the lights of scientific studies, it is known that the vibration has significant effects on living creatures and non-living things. Human body faces with many different vibrations daily. The aim of this study is to provide comfortable and healthy travel by decreasing the vibration coming from the chassis of the intercity buses and to protect the feet of the passengers from vibrationbased threats by producing the amortization in footboards of the seats in harmony with developing technology. In existing vehicles, the leg constructions of the seats are in rigid structure. For this purpose, the experimental modal analysis has been carried out by utilizing impact test method. These measurements were firstly taken as a whole once the legs were mounted on the seat. Then the measurements were carried out only on the legs. As a result of experimental modal analysis, for both of the legs, the FRF (Frequency Response Function) graphics in X, Y and Z directions and the damping rates were obtained. By comparing these graphics and damping rates for both of the legs, the result was obtained. As a result of the experimental studies, it has been observed that the casting legs have decreased the vibration on passenger by damping it more than original legs do.

Keywords

• vibration, modal analysis, damping, car seat

Kaynakça

1. Griffin M. J., Vibration and Motion. Handbook of human factors and ergonomics. A.Willey- Interscience Publication John Willey
2. & Sons Inc., New York, 1997.
3. Kim S. K., White S.W., Bajaj A.K., Davies P. Simplified models of the vibration of mannequins in car seats. Journal of Sound and Vibration, Vol 264, 2003, p. 49-90.
4. Hampel G.A., Chang W.R. Body height change from motor vehicle vibration. Industrial Ergonomics, 1997, p. 489-498.
5. Bovenzi M., Zadini A. Self reported low back symptoms in urban bus drivers exposed to whole body vibration. Spine, Vol. 17, 1992, p. 1048-1059.
6. Dupuis H., Zerlett G. Whole body vibration and disorders of the spine. International Archives of Occupational and Environmental Health, Vol. 59, 1987, p. 323-336.
7. Troup J.D.G. Clinical effects of shock and vibration on the spine. Clinical Biomechanics, Vol. 3, 1988, p. 227-231.
8. www.fmo.org.tr/wp-content/ uploads/2012/02/6Titreşim-Mahmut- Candır.pdf [8]https://www.facebook. com/permalink.php?story_fbid=2 41708382576628&id=241684699245 663 (Occupational healt hand safety expert)

9. Karabulut A. Tractor driver seats research on insulation system. Gazi University. Ph.D. Thesis. 1995, p.34.
10. Dahil L., Karabulut A., Baspınar M.S. Damping effect of porous materials. AKU- Journal of Science, Vol. 11, 2011, p. 1-7.