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Concept study of individual front suspension
2007 (English)Independent thesis Advanced level (professional degree), 20 credits / 30 HE creditsStudent thesis
Abstract [en]

Volvo Buses AB operates on a global market selling products all over the world. To meet customer demands on different markets VBC (Volvo Bus Corporation) must have vehicles competitive in terms of cooping with different environmental demands, i.e. different road conditions. Their coaches, or tourist busses, are designed and built to be experienced as high quality and of course be comfortable to travel in, no matter the conditions. Comfort is a subjective experience for passengers, difficult to define and is often experienced as a verification of the quality. However, it originates from the dynamics of the bus which derives, among other things, from a vehicles suspension. In order to increase the comfort on their future coaches, Volvo wishes to use a new concept for their individual front suspensions. An individual suspension is standard on cars today but not on busses which often use rigid axles. An individual suspension provides superior comfort compared to rigid axles and is therefore the natural choice in coaches. Volvo is looking for a new concept regarding a new individual front suspension that is possible to use in their future coaches. The studied front suspension in this thesis is an suspension developed by Prevost Car Inc. Prevost Car Inc. is a north American company, own by VBC. The objectives are to build a model, representing Prevost’s IFS, using MSC ADAMS/car and be able to analyze the suspension with the strive to improve the comfort, primarily in longitudinal direction. It is the accelerations of the bus chassis, especially in longitudinal direction, that decides whether a bus is experienced as comfortable or not. Therefore, several physical comfort tests on a bus with the correct IFS are performed in order to collect data regarding the acceleration values. This data is used to tune the ADAMS model and to replicate the roads on which the tests are performed. Furthermore, this enables the simulation model to be verified compared to the real IFS. The goal in this thesis is to, relative original model settings, decrease acceleration values in the chassis. Results from a great number of simulations show on a significant improvement regarding the longitudinal comfort. Using a new developed setup, regarding component properties and design, the acceleration levels are proved to be decreased with up to 17 % relative original setup of the IFS.

Place, publisher, year, edition, pages
Keyword [en]
Keyword [sv]
URN: urn:nbn:se:ltu:diva-58451ISRN: LTU-EX--07/050--SELocal ID: f07ebdc8-b536-4084-ac02-ee2a797dca29OAI: diva2:1031839
Subject / course
Student thesis, at least 30 credits
Educational program
Mechanical Engineering, master's level
Validerat; 20101217 (root)Available from: 2016-10-04 Created: 2016-10-04Bibliographically approved

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