Experimental and Numerical Analysis of Stress and Stick-Slip Effect of the Test Stand

2016 ◽  
Vol 827 ◽  
pp. 73-76 ◽  
Author(s):  
Michal Petrů ◽  
Ladislav Ševčík ◽  
Pavel Srb ◽  
Radovan Kovář
Keyword(s):  
Numerical Analysis ◽  
Contact Pressure ◽  
Friction Pair ◽  
Noise Removal ◽  
Test Stand ◽  
Special Device ◽  
Slip Effect ◽  
Stick Slip ◽  
Contact Surfaces

Experimental and numerical analysis describes the design of noise removal effect of the friction pair of trapezoidal screw in a special device call Stick-Slip effect. Solution of the problems builds on previous measurements and testing sliding pairs, which was testing in last analysis. The pair worked in the special bath oil, its characteristics is that it does not support the mechanical lubrication. Measurements and calculations showed that it is necessary to enlarge the diameter for 32 kN load trapezoidal screw. This will reduce the contact pressure, which leads to polish the contact surfaces. You then slip together better and are not as easily stick slip effect.

Experimental and numerical analysis of frictional contact scenarios: from macro stick–slip to continuous sliding

Meccanica ◽  
2014 ◽  
Vol 50 (3) ◽  
pp. 649-664 ◽  
Author(s):  
Davide Tonazzi ◽  
Francesco Massi ◽  
Laurent Baillet ◽  
Antonio Culla ◽  
Mariano Di Bartolomeo ◽  
...  
Keyword(s):  
Numerical Analysis ◽  
Frictional Contact ◽  
Stick Slip

Minimization of contact pressure for hub–shaft friction pair

2015 ◽  
Vol 36 (5) ◽  
pp. 404-408 ◽  
Author(s):  
V. M. Mirsalimov ◽  
P. E. Akhundova
Keyword(s):  
Contact Pressure ◽  
Friction Pair ◽  
Shaft Friction

Simulacija i odstranjivanje stick-slip efekta servosistema sprovodnog aparata hidraulične turbine

2021 ◽  
Vol 23 (1) ◽  
pp. 37-41
Author(s):  
Darko Babunski ◽  
◽  
Emil Zaev ◽  
Atanasko Tuneski ◽  
Laze Trajkovski ◽  
...  
Keyword(s):  
Hydraulic Cylinder ◽  
Friction Model ◽  
Slip Effect ◽  
Hydraulic Systems ◽  
Hydraulic Actuator ◽  
Stick Slip ◽  
Hydro Turbine ◽  
Servo Mechanism ◽  
The Mathematical Model ◽  
Slip Phenomenon

Friction is a repeatable and undesirable problem in hydraulic systems where always has to be a tendency for its removal. In this paper, the friction model is presented through which the most accurate results are achieved and the way of friction compensation, approached trough technique presented with the mathematical model of a hydraulic cylinder of a hydro turbine wicket gate controlled by a servomechanism. Mathematical modelling of a servo mechanism and hydraulic actuator, and also the simulation of hydraulic cylinder as a part of a hydro turbine wicket gate hydraulic system where the stick-slip phenomenon is present between the system components that are in contact is presented. Applied results in this paper and the theory behind them precisely demonstrate under what circumstances the stick-slip phenomenon appears in such a system. The stick-slip effect is simulated using Simulink and Hopsan software and the analysis of the results are given in this paper. Removal of the stick-slip effect is presented with the design of a cascade control implemented to control the behaviour of the system and remove the appearance of a jerking motion.

Numerical Analysis of the Effect of Contact Pressure on the Fretting Fatigue Life in a Press-Fitted Shaft

2009 ◽  
Vol 54 (3) ◽  
pp. 1115-1118 ◽  
Author(s):  
Dong-Hyong Lee ◽  
Seok-Jin Kwon ◽  
Won-Hee You ◽  
Jae-Boong Choi ◽  
Young-Jin Kim
Keyword(s):  
Fatigue Life ◽  
Numerical Analysis ◽  
Contact Pressure ◽  
Fretting Fatigue

A Novel Trans-Scale Precision Positioning Stage Based on the Stick-Slip Effect

2012 ◽  
Vol 2 (2) ◽  
pp. 1-14 ◽  
Author(s):  
Bowen Zhong ◽  
Liguo Chen ◽  
Zhenhua Wang ◽  
Lining Sun
Keyword(s):  
Friction Model ◽  
Slip Effect ◽  
Precision Positioning ◽  
Stick Slip ◽  
Kinematics Model ◽  
Lugre Friction Model ◽  
Positioning Stage ◽  
Simulation Results ◽  
Relationship Of ◽  
The Relationship

This article focuses on developing a novel trans-scale precision positioning stage based on the stick-slip effect. The stick-slip effect is introduced and the rigid kinematics model of the stick-slip driving is established. The forward and return displacement equations of each step of the stick-slip driving are deduced. The relationship of return displacement and the acceleration produced by friction are obtained according to displacement equations. Combining with LuGre friction model, the flexible dynamics model of the stick-slip driving is established and simulated by using Simulink software. Simulation results show that the backward displacement will reduce with the acceleration of the slider produced by dynamic friction force, the rigid kinematics model is also verified by simulation results which are explained in further detail in the article.

scholarly journals Load-dependent surface nanomechanical properties of poly-HEMA hydrogels in aqueous medium

Soft Matter ◽  
2019 ◽  
Vol 15 (38) ◽  
pp. 7704-7714 ◽  
Author(s):  
Gen Li ◽  
Illia Dobryden ◽  
Eric Johansson Salazar-Sandoval ◽  
Mats Johansson ◽  
Per M. Claesson
Keyword(s):  
Aqueous Medium ◽  
Cross Linking ◽  
Slip Effect ◽  
Stick Slip ◽  
Nanomechanical Properties ◽  
Combined Action

The combined action of load and shear results in the formation of a temporary sub-micrometer hill in front of the tip. As the tip pushes against such hills, a pronounced stick-slip effect is observed for the hydrogel with low cross-linking density.

Investigation of Friction Temperature in Railway Disc Brake

2012 ◽  
Vol 479-481 ◽  
pp. 202-206
Author(s):  
Wan Hua Nong ◽  
Fei Gao ◽  
Rong Fu ◽  
Xiao Ming Han
Keyword(s):  
Finite Element ◽  
Contact Pressure ◽  
Friction Pair ◽  
Brake Disc ◽  
Finite Element Software ◽  
Disc Surface ◽  
Friction Temperature ◽  
Steel Disc ◽  
Braking Force ◽  
Braking Process

The distribution of temperature on the rubbing surface is an important factor influencing the lifetime of a brake disc. With a copper-base sintered brake pad and a forge steel disc, up-to-brake experiments have been conducted on a full-scale test bench at a highest speed of 200 Km/h and a maximum braking force of 22.5 KN. The temperature distributions on brake disc surface have been acquired by an infrared thermal camera, and the contact pressure on the contact surface of the friction pair has been calculated by the finite element software ABAQUS. The results show that the area and thermal gradient of the hot bands increase with the increase of braking speed and braking force. The hot bands occur in priority at the radial location of r=200 mm and r=300 mm, and move radially in the braking process. The finite element modelling calculation indicates that the distribution of the contact pressure on the disc surface in radial direction is in a "U"-shape. The maximum contact pressure occur at the radial locations of r=200 mm and r=300 mm, and the minimum contact pressure occur in the vicinity of the mean radius of the disc. The conformity of contact pressure distributions with the practical temperature evolutions indicates that the non-uniform distribution of the contact pressure is the factor resulting in the appearance of hot bands on the disc surface.

Stick-Slip Behaviour of Seals With Respect to Time Dependent Friction Forces

2004 ◽  
Author(s):  
Markus Lindner ◽  
Matthias Kro¨ger ◽  
Karl Popp ◽  
Manuel Gime´nez
Keyword(s):  
Stability Analysis ◽  
Time Dependent ◽  
Dynamic Friction ◽  
Slip Effect ◽  
Stick Slip ◽  
Friction Forces ◽  
Seal Design

In the present paper dynamic friction processes in seals are investigated. The undesired stick-slip effect of these components under real technical conditions is analyzed. Starting with the basics of stick-slip vibrations the development of an advanced seal design with improved properties is presented that prevents stick-slip. Finally, an optimization based on the extensive but simple stability analysis is shown by an expanded theory of stick-slip simulations.

Sign in / Sign up

Export Citation Format

Share Document