Study of Design Mechanisms to Reduce the Occurrence and Gravity of the Impact of Bottoming-Out of Suspension-equipped Seats Abstract The installation of suspension seats equipped with rigid rubber end stops at the end of suspension travel is often the solution adopted to reduce the vibration transmitted to the bodies of vehicle drivers. When strong solicitations result in a significant displacement of the seat to the end of the course of travel, the impact on these stops transmits vibrations to the driver that may increase his vibration dose. Based on an analytical model developed by the authors, this document presents the optimal characteristics of seat suspension and stops that would reduce as much as possible the incidence or severity of these impacts. Among the alternatives proposed are end stops of variable stiffness or even a shock absorber offering progressive damping in relation to the displacement. Produced Under this Project Scientific Reports Study of design mechanisms to limit the magnitude of impacts caused by the bottoming of suspension seats Research Report: R-368 Simplified Articles Les limites des sièges à suspension munis de butéesVibrations Volume 17, n0 2 Scientific Publications L'exposition à des vibrations globales du corps et son rôle dans l'étiologie des maux de dosBoileau P.-É.Source : Travail et santé, vol. 18, no 1, 2002, p. 31-35Evaluation of the vibration and shock attenuation performance of a semi-active magneto-rheological fluid damperMcmamus S. J., St-Clair K. A., Boileau P.-É., Rakheja S., Boutin J.Source : Journal of Sound and Vibration, vol. 253, no 1, 2002, p. 313-327Performance analysis of suspension seats under high magnitude vibration excitations : Part 1: Model development and validationRakheja S., Boileau P.-É., Wang Z., Politis H.Source : Journal of Low Frequency Noise, Vibration and Active Control, vol. 22, no 4, 2003, p. 225-252Performance analysis of suspension seats under high magnitude vibration excitations: II. Design parameter studyRakheja S., Boileau P.-É., Wang Z.Source : Journal of Low Frequency Noise, Vibration and active Control, vol. 23, no 1, 2004, p. 7-26Effects of sitting postures on biodynamic response of seated occupants under vertical vibrationWang W., Rakheja S., Boileau P.-É.Source : International Journal of Industrial Ergonomics, vol. 34, no 4, 2004, p. 289-306Effects of sitting postures on biodynamic response of seated ocupants under vertical vibrationWang W., Rakheja S., Boileau P.-É., Pu W.Source : in Ninth Internatinal Congress on Sound and Vibration (9th : July 8-11, 2002 : Orlando, Florida), 2002Vibrations globales du corps et maux de dos: mythe ou réalitéBoileau P.-É.Source : in D'un riche passé @ un avenir prometteur : 23e Congrès de l'Association québécoise pour l'hygiène, la santé et la sécurité du travail / AQHSST, (23e : 9-11 mai, 2001 : Hull, Canada), 2001, p. 171-182Generalized asymmetric hysteresis model of controllable magnetorheological damper for vehicle suspension attenuationWang, E., Ma X., Su C., Rakheja S.Source : Chinese Journal of Mechanical Engineering, vol. 17, no 2, 2004, p. 301-330Safety and comfort analysis of a 3-D vehicle model with optimal non-linear active seat suspensionBouazara M., Richard M. J., Rakheja S.Source : Journal of Terramechanics, vol. 43, no 2, 2006, p. 97-118Synthesis of a semi-active controller for a magneto-rheological damper suspension seat for attenuation of vibration and shockMa X. Q., Rakheja S., Su C. Y.Source : in Proceedings of Inter-Noise 2006 (December 3-6, 2006 : Honolulu, Hawaii, U.S.A.), 2006Dynamic characterization of a magnetorheological fluid damper and synthesis of a semi-active suspension seatXiao Qing M.Source : Thèse de doctorat, Montréal, Université Concordia, 2006Damping requirement of a suspension seat subject to low frequency vehicle vibration and shockMa X. Q., Rakheja S., Su C. Y.Source : in Proceedings of the CSME Forum 2006 (May 19-22, 2006 : Kananaskis, Canada), 2006 Additional Information Type: Project Number: 0098-0130 Status: Completed Year of completion: 2004 Research Field: Mechanical and Physical Risk Prevention Team: Paul-Émile Boileau (IRSST)Subhash Rakheja (Université Concordia)