نتایج جستجو برای: dynamic friction

تعداد نتایج: 437313  

2000
Karim A. Tahboub H. Harry Asada

This paper presents kinematic and dynamic analysis of a holonomic vehicle with continuously-variable transmission. Four ball wheels, independently actuated by DC motors, enable for moving the vehicle in any direction within the plane and rotating it around its center. The angle between the two beams holding the balls can be changed to alter the gear ratio and other dynamic characteristics of th...

2004
P. Lischinsky

oint friction is one of the major limitations in performing high J precision manipulation tasks. It affects both static and dynamic performances, and may cause instability when coupled to position or force feedback control. Thus, compensating for joint friction has been one of the main research issues in robot design and control over the years. The aim of this paper is to show how friction comp...

2007
A. Khomenko I. Lyashenko

Using the Lorenz model for viscoelastic medium approximation the melting of ultrathin lubricant film is studied by friction between atomically flat surfaces. The fluctuations of lubricant temperature are taken into account defined by Ornstein-Uhlenbeck process. The phase portraits are defined corresponding to the different regions of dynamic phase diagram and determining system’s kinetics. It i...

2015
Ming Liu Xuewen Rong Yibin Li Yanfang Yin

The tire-road friction coefficient is critical to the performance of mobile robots working outdoors. However, it is difficult to measure using commercially available technology sensors. This paper presents a method of estimating the tire-road friction coefficient using a disturbance observer (DO) with compensator; the chassis speed is not needed. In this paper, the torque produced by the tire-r...

Journal: :IEEE Trans. Systems, Man, and Cybernetics, Part C 2000
Sunan Huang Kok Kiong Tan Tong Heng Lee

We present a new compensation technique for a friction model, which captures problematic friction effects such as Stribeck effects, hysteresis, stick-slip limit cycling, pre-sliding displacement and rising static friction. The proposed control utilizes a PD control structure and an adaptive estimate of the friction force. Specifically, a radial basis function (RBF) is used to compensate the eff...

Journal: : 2022

Problem This scientific article is devoted to the value of static and dynamic coefficients friction disc-pad brakes. The issue brake wear very acute because safety using machine itself depends on its reliable operation. Therefore, relevance chosen topic cannot be doubted. Goal. aim establish patters influence main operational parameters pairs a model potential kinematic coefficient friction. Me...

2011
Mark W. McClure Roland N. Horne

This paper describes a numerical investigation of seismicity induced during injection into a single, isolated fracture. A model was developed and used that couples (1) fluid flow and (2) rate and state friction. Rate and state friction theory describes how friction on a fault depends on both sliding velocity and past sliding history. Rate and state friction is used widely in earthquake modeling...

1999
Phil Attard Ian Wark Mark W. Rutland

The mechanism and geometry of force measurement with the atomic force microscope are analyzed in detail. The effective spring constant to be used in force measurement is given in terms of the cantilever spring constant. Particular attention is paid to possible dynamic effects. Theoretical calculations show that inertial effects may be neglected in most regimes, the exception being when relative...

Journal: :Philosophical transactions. Series A, Mathematical, physical, and engineering sciences 2009
Michael Nosonovsky Bharat Bhushan

Friction is a dissipative irreversible process; therefore, entropy is produced during frictional contact. The rate of entropy production can serve as a measure of degradation (e.g. wear). However, in many cases friction leads to self-organization at the surface. This is because the excess entropy is either driven away from the surface, or it is released at the nanoscale, while the mesoscale ent...

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