The effect of friction in coulombian damper

13th International Conference on Tribology

Wahad, H.S.^1 ; Tudor, A.^1 ; Vlase, M.^2 ; Cerbu, N.^1 ; Subhi, K.A.^1,3

University Politehnica of Bucharest, Spl. Independentei 313, Bucharest

060042, Romania^1

Technical University of Civil Engineering of Bucharest, Romania^2

AL-Furat AL-Awsat, Technical University of Iraq, Iraq^3

关键词: Constant-friction coefficient;    Contact pressures;    Damping efficiency;    Friction coefficients;    Friction force;    Variable frictions;    Vibration phenomena;    Work condition;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/174/1/012021/pdf
DOI  :  10.1088/1757-899X/174/1/012021

来源: IOP

【 摘 要 】

The study aimed to analyze the damping phenomenon in a system with variable friction, Stribeck type. Shock absorbers with limit and dry friction, is called coulombian shock-absorbers. The physical damping vibration phenomenon, in equipment, is based on friction between the cushioning gasket and the output regulator of the shock-absorber. Friction between them can be dry, limit, mixture or fluid. The friction is depending on the contact pressure and lubricant presence. It is defined dimensionless form for the Striebeck curve (μ friction coefficient - sliding speed v). The friction may damp a vibratory movement or can maintain it (self-vibration), depending on the μ with v (it can increase / decrease or it can be relative constant). The solutions of differential equation of movement are obtained for some work condition of one damper for automatic washing machine. The friction force can transfer partial or total energy or generates excitation energy in damper. The damping efficiency is defined and is determined analytical for the constant friction coefficient and for the parabolic friction coefficient.