Friction Models
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Recent papers in Friction Models
In this paper hybrid theory has been applied to design a state-feedback control law of an electrical drive with friction. The drive is modeled as a piecewise affine (PWA) system and a finite time optimal control problem is formulated for... more
An analytical ploughing model is used to compute the forces on a rigid, elliptical, i.e. ellipsoid and elliptic-paraboloid shaped, asperity sliding through a rigid-plastic substrate as a function of its axes size, ellipticity ratio and... more
Contemporary archaeology recognises the modern landscape as a material resource. This resource has the ability to challenge assumptions regarding the 20th and 21st centuries based in historiography and memory. In this way it engages with... more
Friction is a system property, which indicates that it depends on multiple factors, such as the material properties, contact parameters and the environment. Friction is one of the themes in tribology, an engineering technology which is... more
Hazen-Williams equation is used widely by irrigation systems’ designers due to its simplicity.However, Darcy-Weisbach equation is more accurate and reliable. The accuracy of the latter is due to its friction coefficient, which depends on... more
Cuff tear arthropathy (CTA) is a shoulder pathology characterized by a massive and irreparable rotator cuff tear and an abnormal contact between the humeral head and the acromion. CTA is often associated with shoulder pseudo-paralysis.... more
В настоящей статье рассмотрены примеры достаточно простых задач, иллюстрирующие взаимосвязь приближенных моделей описывающих силы, действующие при качении деформируемого колеса. Основные причины, побудившие автора представить настоящий... more
Thesis at the Western Michigan University by Ravishankar Thangavelu, 2004 111 pages Not about Wankel rotary engines (dealing with the Hopkins rotor engine), but, the subject "friction" is pretty important ... > Hopkins rotor engine with... more
This paper presents the dynamics modeling and dynamic identification of a dual-blade wafer handling robot. An explicit form dynamic model for this 8-link parallel robot is proposed. The dynamic model is transformed into a decoupled form... more
This paper proposes an iterative method that can simulate mechanical systems featuring a large number of contacts and joints between rigid bodies. The numerical method behaves as a contractive mapping that converges to the solution of a... more
Results from an experimental and numerical study of skin friction levels obtained when hydrogen is injected into turbulent boundary layers are presented. Measurements are reported from experiments in the T4 free-piston reflected shock... more
Results from an experimental and numerical study of skin friction levels obtained when hydrogen is injected into turbulent boundary layers are presented. Measurements are reported from experiments in the T4 free-piston reflected shock... more
This work deals with the hydraulic gradient estimation in real-time of a transport pipeline computational model by considering a slightly compressible fluid and slightly deformable conduit walls. Since the hydraulic gradient (J(Q)) caused... more
The paper presents direct measurement of in-cylinder friction from a single cylinder motocross race engine under motored conditions and compares the same with a new analytical predictive method. These conditions are encountered in... more
A coating layer is often present on engineering surfaces. An example is a zinc coating on steel sheet, this being a soft metallic coating on a hard substrate. To characterize the tribological behaviour of these engineered surfaces, it is... more
Nonlinear friction in tendon-sheath mechanism (TSM) introduces difficulties in predicting the end-effector force inside the human body during surgical procedures. This brings a critical challenge for surgical robots that need high fidelity... more
Purpose – The purpose of the paper was to find a simple structure of motion controller for permanent magnet direct drive. Application of sliding mode controller theory and equivalent disturbance estimator creates proper non-linear... more
We study the dynamics of an incommensurate chain sliding on a periodic lattice, modeled by the Frenkel-Kontorova Hamiltonian with initial kinetic energy, without damping and driving terms. We show that the onset of friction is due to a... more
The consequence of highway accidents in terms of injuries, loss of lives, and road closures is a major strain on any economy. It has therefore become necessary to look into the causes of such accidents from a road condition view point... more
Rate and state friction has been extensively used to explain many features of the seismic cycle but the scaling of the experimentally derived parameters a, b and d c for real faults is problematic. The purpose of this paper is to present... more
One of the ultimate goals in landslide hazard assessment is to predict maximum landslide extension and velocity. Despite much work, the physical processes governing energy dissipation during these natural granular flows remain uncertain.... more
We show that invariance properties of the Lagrangian of an incommensurate system, as described by the Frenkel-Kontorova model, imply the existence of a generalized angular momentum that is an integral of motion if the system remains... more
In this paper we analyze the influence of shear and normal stress changes on frictional properties. This problem is fundamental as, for instance, sudden stress changes are naturally induced on active faults by nearby earthquakes. As any... more
Research was conducted to determine the effect of lubricants on stress and strain in the contact of metal surfaces. Experiments were carried out on the introduction of a fixed and moving indenter in contact with a dry and lubricated... more
The parasitic drag losses incurred by wet clutches, used in transmission systems, can significantly affect vehicular powertrain efficiency. This paper presents a novel implicit solution for hydrodynamic parasitic drag losses of disengaged... more
The influence of isolator characteristics on the seismic response of multi-story base-isolated structure is investigated. The isolated building is modeled as a shear type structure with lateral degree-of-freedom at each floor. The... more
A material point method (MPM)-based numerical model has been used to study the effect of asperity size and orientation relative to sliding direction on the ploughing behaviour of a rigid, ellipsoidal asperity. Based on the simulated... more
It is presented a method for numerical and experimental determination of the coefficient of rolling friction of the steel small ball (sphere). The sphere is hanged on a non-elastic and weightlessness thread. Such the formed pendulum... more
This work deals with the hydraulic gradient estimation in real-time of a transport pipeline computational model by considering a slightly compressible fluid and slightly deformable conduit walls. Since the hydraulic gradient (J(Q)) caused... more