relationships in such a way as to yield a system of equations which describes the velocity and angular velocity of the manipulated object as functions of the robot's joint velocities. The inverse kinematic problem results in a system of equations describing the joint velocities as functions of the object's translational and angular velocities. In both cases it is assumed that the positions of t...

The influence of transverse surface roughness on EHL characteristics has been investigated numerically using an extensive set of full EHL line contact simulations for shear-thinning lubricants under pure sliding condition. The shear-thinning behavior of lubricant is modeled using Carreau viscosity equation along with Doolittle-Tait equation for lubricant compressibility. The surface roughness i...

Abstract We report experimental measurements of friction between an aluminum alloy sliding over steel with various lubricant densities. Using the topography scans surfaces as input, we calculate real contact area using boundary element method and dynamic coefficient by means a simple mechanistic model. Partial lubrication is accounted for random deposition model oil droplets. Our approach repro...

The effects of applied load, sliding speed and sliding distance on the dry sliding wear behavior of aged Al-SiCp-Gr composites were investigated. The specimen were fabricated by stir-casting technique. The pin-on-disc wear testing machine was used to investigate the wear rate by design of experiments based on L27 using Taguchi technique. Sliding distance was the most important variable that inf...

Rolling–sliding contacts are found in a variety of systems, such as gears, drum brakes, and tire pavements. Such systems inherently have multiple nonlinearities kinematic, contact, friction nonlinearities. Further, most these clearance between components which causes excessive vibration noise. The combination with other makes the system dynamically interesting. It is important to understand dyn...

While its classical model is relatively simple, friction actually depends on both the interface properties of interacting surfaces and on the dynamics of the system containing them. At a microscopic level, the true contact area changes as the surfaces move relative to each other. Thus at a macroscopic level, total friction and normal forces are time-dependent phenomena. This paper introduces a ...

[1] Faulting and brittle deformation of mantle rocks occurs in many tectonic settings such as oceanic transform faults, oceanic detachment faults, subduction zones, and continental rifts. However, few data exist that directly explore the frictional properties of peridotite rocks. Improved constraints on the brittle deformation of peridotite is important for a more complete understanding of the ...

Tribological investigations on the macroscopic scale revealed that friction can be influenced in situ by applying electric potentials, if electrically conductive fluid such as an ionic liquid is used as a lubricant. Enrichment of charged ions at a steel interface occurs by applying electric surface potentials in a three-electrode setup. As a consequence, the lubrication conditions change. It is...