Determination of the characteristics of viscous friction in sliding bearings by the pendulum method
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Date
2017
Authors
Dykha, A.
Aulin, V.
Makovkin, O.
Posonskiy, S.
Диха, А. В.
Аулін, В. В.
Journal Title
Journal ISSN
Volume Title
Publisher
НВП ПП «Технологічний Центр»
Abstract
We analyzed the methods of determining the characteristics of
friction based on the experimental studies using the damped oscillations
of a pendulum. It was established that the available studies
into characteristics of viscous friction lack the analytical description
of the process of damped oscillations at viscous resistance and recommendations
regarding practical calculation of the characteristics
of friction. Here we propose a theoretical model of the swinging
pendulum in the cylindrical sliding supports with a lubricant. It is
demonstrated that for a pendulum in the lubricated sliding supports,
the process of oscillations is described by a second order differential
equation with viscous resistance, proportional to the deflection velocity
of the pendulum.
It is found based on the solution of the equation that the ratio
of adjacent amplitudes of damped oscillations is a constant magnitude,
hence it follows that the absorption coefficient is constant
over the entire process. We established, based on the theoretical
model of pendulum oscillations, that for the viscous friction
the absorption coefficient is equal to the doubled logarithmic
damping decrement and is determined by one or a cycle of oscillations.
The formulas are received for calculating the indicator of
dynamic viscosity of a lubricant in the contact by the decrement
of pendulum oscillations damping. The developed procedures for
determining the characteristics of viscous friction are applied to
examine the contact- viscous properties of different combinations
of lubricating and design materials. The results received are
aimed at searching for design and technological solutions in order
to reduce the energy losses to friction in the sliding supports of
machines. Теоретично показано, що для маятника у
змащених опорах ковзання процес коливань
описується диференціальним рівнянням дру-
гого порядку з в`язким опором, пропорційним
швидкості коливань. На основі моделі коли-
вань маятника отримано, що коефіцієнт
поглинання енергії дорівнює подвійному лога-
рифмічному декременту затухань. Визначена
процедура розрахунку динамічної в`язкості
мастила по декременту затухань коливань.
Description
Keywords
sliding support, method of pendulum, damped oscillations, absorption coefficient, oil viscosity, опора ковзання, метод маятника, затухаючі коливання, коефіцієнт поглинання, в`язкість масла
Citation
Determination of the characteristics of viscous friction in sliding bearings by the pendulum method / A. Dykha, V. Aulin, O. Makovkin, S. Posonskiy // Восточно - Европейский журнал передовых технологий. - 2017. - Vol. 3, Issue 7 (87). - P. 4-10