Experimental and analytical investigations of friction at lubricant bearings in passive suspension systems

Abstract

Friction is a very complex phenomenon, arising from the contact of surfaces. In many engineering applications, the success of models in predicting experimental results remains strongly sensitive to the friction model. In practice, it is not possible to determine an exact friction model; however, based on observation results and dynamic systems analysis, a recently proposed model of nonlinear friction at linear supported lubricant bearings is investigated. This model involved static friction, stiction region, and dynamic friction, which is consisted of transition, Stribeck effect, Coulomb and viscous frictions. On the other hand, this model is applied in the passive suspension system. Accordingly, a new quarter-car passive suspension model with the implementation of friction force is considered. Also, a vital experimental and simulation aspect is the generation of system input. Therefore, a nonlinear hydraulic actuator used, modelling this actuator including the dynamic of servovalve derived by the proportional-integral (PI) controller, is prepared. This study is validated experimentally, with simulation achieving C++ compiler. Consequently, a good agreement between the experimental and simulation results is obtained, i.e., the nonlinear friction, passive suspension system and nonlinear hydraulic actuator models are entirely accurate and useful.

Effect of the angle of the laid-up filaments on the surfaces on the coefficient of static friction between parts manufactured by extrusion-based 3D printing

“…[19][20][21] However, friction also has a series of negative effects that can generate noise, wear, and unpredictable behaviors of multiple components, thus motivating studies to reduce it through design and control measures. 22 In FDM/FFF, the analysis of friction, as a function of the process parameters, is particularly important for the application of the technique in various engineering elements. 23 One way to describe the friction force or estimate the magnitude of the resistance of the relative movement between bodies, is through the coefficient of friction (COF), which can be static (ls) or dynamic (ld).…”

Nonlinear dynamics of a vehicle with a displacement-sensitive mono-tube shock absorber

“…, 5, m = n) to the chamber K n . In the case of a turbulent flow [26], the flow rate Q mn is determined from the formula:…”

The Influence of Hydrothermal Aging on the Dynamic Friction Model of Rubber Seals

“…Friction is a widespread and very complex phenomenon [2], especially in soft material friction. A mathematical model has been widely developed to study the friction process based on a lot of friction tests [3,4].…”