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Ride and handling consequences of space efficient shock absorbers
2001 (English)Independent thesis Advanced level (professional degree), 20 credits / 30 HE creditsStudent thesis
Abstract [en]

This report studies what consequences a rear suspension with low damping ratio has for Volvo V70 AWD, the result is applicable for all sorts of low damping ratio suspension. Damping ratio for the S80, S60 and V70 Volvo cars is today ~0.66. In this report a damper ratio down to 0.34 is investigated. The gain of lower damping ratio is the ability to increase luggage compartment by lowering the upper mounting of the damper so that the floor can be lowered and getting more compact suspension units which simplifies the assembly of the vehicle. Six different complete vehicle models were created in ADAMS Car, all with different positions for the rear upper damper mounting. The models were, one reference model exactly as Volvo V70 AWD, one reference model with the upper damper point tilted 4 degrees forward and four models where the upper damper mount lowered in four steps down to 200mm lower then reference. The lowering damping ratio causes the forces within the suspension to increase since the force from the damper has to be increased in order to have equivalent wheel centre damper force. The higher forces cause greater elasticity’s in the system. Elasticity within the system is of greater concern since the active damper stroke for leading oscillating energy out of the system decreases at the same degree as the damping ratio. Thereby the influence from backlash upon undamped motions of the body and wheel increases. In order to reduce the elastic backlash the bushings exposed to the higher forces has to be stiffer, the damper mounted so that it twists the linkage as little as possible, the damper constructed for small internal backlash and upper damper mount to subframe in order to get adequate stiffness in the mounting point. By mounting the damper to the subframe the low frequent sound that travels through the damper is lead into the subframe instead of into the body hence the low frequent noise in the passenger compartment reduces. The changes in characteristics for a low damping ratio suspension lies within the error margin of the simulations there for has the recommendations and conclusions been based upon literature studies and interviews with engineers at VCC.

Place, publisher, year, edition, pages
2001.
Keyword [en]
Technology, dynamic, simulation, shock absorber, suspension, space, efficient, adams
Keyword [sv]
Teknik
Identifiers
URN: urn:nbn:se:ltu:diva-54679ISRN: LTU-EX--01/321--SELocal ID: b9d0d7d1-e634-4d12-8583-ade12d8ca5d4OAI: oai:DiVA.org:ltu-54679DiVA: diva2:1028061
Subject / course
Student thesis, at least 30 credits
Educational program
Mechanical Engineering, master's level
Examiners
Note
Validerat; 20101217 (root)Available from: 2016-10-04 Created: 2016-10-04Bibliographically approved

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Citation style
  • apa
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
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