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Gas dampers: model development and potential ride performance evaluation

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The main characteristic of a gas damper (GD) is the use of gas as internal fluid, which offers an alternative to hydraulic shock absorbers. In this paper, a mathematical GD model is presented and validated. The use of a compressible fluid provides GD with a behaviour dependent on velocity, like conventional dampers, but also with a strong dependency on frequency and on stroke amplitude. This dependency allows an improvement in the traditional compromise between comfort and safety. A quarter-car model is used to evaluate the ride performance that can be expected using the GD, focusing on the cited compromise. Results are compared with the ride performance of a hydraulic shock absorber. Finally, a sensitivity study centred on the stiffness of the internal fluid is presented.

Keywords: handling; off-road vehicle dynamics; ride comfort; shock absorber; suspension systems

Document Type: Research Article


Affiliations: 1: Automotive Laboratory, Applied Mechanics Department, Tecnun, University of Navarra, San Sebastian, Spain 2: CEIT and Tecnun, University of Navarra, San Sebastian, Spain 3: Tenneco/METC, Belgium 4: Construcciones y Auxiliar de Ferrocarriles S.A. and Tecnun, University of Navarra, San Sebastian, Spain

Publication date: January 1, 2011


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