A mechanism for the excitation of piston rod vibrations in automotive damper modules is discussed by a simple model. An improved nonlinear model based on elasticity effects leads to good simulation results. It is shown theoretically and experimentally that the adaptation of the stiffness of the piston rod bushing to the stiffness of the damper force characteristic can eliminate the piston rod oscillations completely. Strong resonance oscillations of the piston in damper modules are due to changes in the stiffness ratio of damping stiffness to spring stiffness. The compliances of oil and cylinder wall cause higher amplitudes of the piston oscillation. One way to avoid the excitation of resonance oscillations of the piston is the adaptation of the force characteristics of the damping and the spring element so that the stiffness ratio remains constant during operation. Further investigations will concentrate on the influence of the accuracy of the stiffness adaptation on the piston oscillations. The sensitivity of these vibrations to the completeness of the stiffness adaptation will be decisive for the use of this concept in practice.
Damper modules with adapted stiffness ratio
Archive of Applied Mechanics ; 81 , 7 ; 853-862
2011
10 Seiten, 9 Bilder, 3 Quellen
Article (Journal)
English
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