Wear Processes in a Mechanical Friction Clutch: Theoretical, Numerical, and Experimental Studies

Abstract

Mathematical modeling, theoretical/numerical analysis, and experimental verification of wear processes occurring on the contact surface of friction linings of a mechanical friction clutch are studied. In contrast to many earlier papers we take into consideration wear properties and flexibility of friction materials being in friction contact. During mathematical modeling and numerical simulations we consider a general nonlinear differential model of wear (differential wear model) and a model of wear in the integral form (integral wear model). Equations governing contact pressure and wear distributions of individual friction linings, decrease of distance between clutch shields, and friction torque transmitted by the clutch are derived and compared with experimental data. Both analytical and numerical analyses are carried out with the qualitative and quantitative theories of differential and integral equations, including the Laplace transform approach to ODEs. We show that theoretical results and numerical simulations agree with the experimental data. Finally, a numerical analysis of the proposed mathematical models was carried out in a wider range of parameters of the considered system.

Nonlinear Dynamics of a Power-Split Transmission Unit with a Planetary Gear Train and Selectable One-Way Clutches

“…Additionally, resonance responses of PGT on range 1277.5-1318 Hz of one-way model disappear in accordance with the jump point and collision of SOWC-C on range 1277.5-1318 Hz. Similar responses happen to SOWC-R. e resonance area moves right side as dimensionless stiffness k OC /m OC r 2 OC increases. It is worth noticing that responses of SOWC connected to the sun gear are always more in accordance with the PGT.…”

“…Friction clutches, as common executive mechanisms, are widely used in vehicle transmissions. Features of the friction engagement governed by diaphragm springs in general, and problems such as friction, wear, temperature, sliding speed, and contact pressure [1][2][3] in particular, have rendered high energy consumption, control complexity, and slow response speed that prevent the existing vehicle transmissions from upgrading.…”

An Effect of a Carbon-Containing Additive in the Structure of a Friction Material on Temperature of the Wet Clutch Disc

“…In this paper, apart from the calculations using an exact solution to the thermal problem of friction related to the heating of the dry clutch, the results of the relevant bench tests with the use of a thermal imaging camera are also presented. Analytical differential and integral wear was developed to prepare detailed maps of changes in friction material wear during clutch operation [23]. The proposed approach also allows for the analysis of changes with the braking time of the torque transmitted by the clutch.…”

A Fractional Time-Derivative Model for Severe Wear: Hypothesis and Implications

“…6 has been successfully used to predict the wear resistance of polymer composite materials designed for extreme environmental conditions (Gardos, 1982;Sedakova and Kozyrev, 2021), there is a problem with applying the wear Eq. 6 for solving the wear contact problems with the spatialtemporal variation of the contact pressures (Grzelczyk and Awrejcewicz, 2015;Ciavarella et al, 2020).…”