In this paper, a SDOF system with nonlinear viscous friction under harmonic excitation is studied. A nonlinear viscous friction model is built as an exponential expansion of the relative slip velocity. According to the adaptive control theory, an adaptive controller for the friction compensation of the SDOF system with nonlinear viscous friction is put forward by using the model-based parameter...

frictional shear stress is usually determined by utilizing the coefficient of friction or the constant friction factor models. the present study deals with finite element analysis of double cup extrusion process to determine the relationship between constant friction factor (m) and coefficient of friction (µ), since the metal flow in this process is very sensitive to frictional conditions. ther...

This paper presents a comparative study among friction behavior of several double-acting pneumatic actuators available to industrial use. A brief review covering the manner that pneumatic actuator manufacturers and current literature approach friction force and its usual models also is presented. After depicting friction test methodology and test apparatus, the comparison work is carried out th...

ABSTRACT We analyse how drag forces modify the orbits of objects moving through extended gaseous distributions. consider hydrodynamic (surface area) and dynamical friction (gravitational) drive evolution orbital eccentricity. While cause eccentric to become more circular, can eccentric. develop a semi-analytic model that accurately predicts these changes by comparing total work torque applied o...

The present research study has been undertaken to carry out slope stability evaluation of the Jhika Gali landslide in Pakistan using GeoStudio. For this purpose, site geometry existing adjacent slided one was measured and samples were collected from site. in-situ moisture content 14% dry unit weight 18.63 kN/m3. Unconfined compression tests unconsolidated-undrained (UU) triaxial performed on re...

Abstract The critical taper model best describes the first-order mechanics of subduction zone wedges. wedge geometry, which is conventionally defined by two parameters, slope angle and basal dip angle, accounts for strength megathrust. By applying this theoretical model, fault frictional properties earthquake occurrences can be compared among zones, within a single zone, spatial distribution or...

Distinctly quantum friction effects of three types are surveyed: internal friction, measurement-induced friction, and quantum-fluctuation-induced friction. We demonstrate that external driving will lead to quantum internal friction, and critique the measurement-based interpretation of friction. We conclude that in general systems will experience internal and external quantum friction over and b...

The friction is detrimental to the normal work of the servo system, but the friction mechanism is very complicated. In this paper, Tustin friction model is used as the friction parameter identification, reflecting the phenomenon of friction in the system, and laying the foundation for the friction compensation. Tustin model is a nonlinear friction one, and the friction properties can be reflect...

In this paper, we extend previous works on the relation between mass and inner slope in dark matter density profiles. We calculate that range going from dwarf galaxies to cluster of galaxies. This was done thanks a modeling energy transfer via SN AGN feedback, as well dynamical friction baryon clumps. show that, above galaxy masses (Groups clusters), slope-mass changes its trend. It flattens (t...

Friction and wear become significant at small scale lengths, particularly in MEMS/NEMS. Nanopatterns are regarded as a potential approach to solve these problems. In this paper, we investigated the friction behavior of nanopatterned silicon surfaces with a periodical rectangular groove array in dry and wear-less single-asperity contact at the nanoscale using molecular dynamics simulations. The ...