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Shock and Vibration
Volume 2016 (2016), Article ID 6182847, 9 pages
http://dx.doi.org/10.1155/2016/6182847
Research Article

Analysis of Simplifications Applied in Vibration Damping Modelling for a Passive Car Shock Absorber

Faculty of Transport, Silesian University of Technology, Krasińskiego 8, 40-019 Katowice, Poland

Received 22 October 2015; Revised 24 January 2016; Accepted 27 January 2016

Academic Editor: Minvydas Ragulskis

Copyright © 2016 Łukasz Konieczny. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

The paper presents results of research on hydraulic automotive shock absorbers. The considerations provided in the paper indicate certain flaws and simplifications resulting from the fact that damping characteristics are assumed as the function of input velocity only, which is the case of simulation studies. An important aspect taken into account when determining parameters of damping performed by car shock absorbers at a testing station is the permissible range of characteristics of a shock absorber of the same type. The aim of this study was to determine the damping characteristics entailing the stroke value. The stroke and rotary velocities were selected in a manner enabling that, for different combinations, the same maximum linear velocity can be obtained. Thus the influence of excitation parameters, such as the stroke value, on force versus displacement and force versus velocity diagrams was determined. The 3D characteristics presented as the damping surface in the stoke and the linear velocity function were determined. An analysis of the results addressed in the paper highlights the impact of such factors on the profile of closed loop graphs of damping forces and point-type damping characteristics.