Empirical Modelling of Frictional Noise and Two-Point Contact Using Ball-On-Disc Tribometer

2020 ◽  
Author(s):  
Kanza Basit ◽  
Hamza Shams ◽  
Muhammad A. Khan ◽  
Asif Mansoor
Keyword(s):  
Point Contact ◽  
Empirical Modelling ◽  
Frictional Noise ◽  
Ball On Disc

scholarly journals A thermal resistances-based approach for thermal-elastohydrodynamic calculations in point contacts

2017 ◽  
Vol 232 (11) ◽  
pp. 2088-2102 ◽  
Author(s):  
Eduardo de la Guerra Ochoa ◽  
Javier Echávarri Otero ◽  
Enrique Chacón Tanarro ◽  
Benito del Río López
Keyword(s):  
Friction Coefficient ◽  
Film Thickness ◽  
Thermal Effects ◽  
Good Accuracy ◽  
Computational Cost ◽  
Point Contact ◽  
Elastohydrodynamic Lubrication ◽  
Point Contacts ◽  
New Approach ◽  
Ball On Disc

This article presents a thermal resistances-based approach for solving the thermal-elastohydrodynamic lubrication problem in point contact, taking the lubricant rheology into account. The friction coefficient in the contact is estimated, along with the distribution of both film thickness and temperature. A commercial tribometer is used in order to measure the friction coefficient at a ball-on-disc point contact lubricated with a polyalphaolefin base. These data and other experimental results available in the bibliography are compared to those obtained by using the proposed methodology, and thermal effects are analysed. The new approach shows good accuracy for predicting the friction coefficient and requires less computational cost than full thermal-elastohydrodynamic simulations.

Synchronous Observation With Friction Measurement Prior to and During Occurrence of Scuffing

2010 ◽  
Author(s):  
Kazuyuki Yagi ◽  
Joichi Sugimura ◽  
Seiji Kajita ◽  
Toshihide Ohmori ◽  
Atsushi Suzuki
Keyword(s):  
Friction Coefficient ◽  
Contact Area ◽  
Wear Debris ◽  
Point Contact ◽  
The Other ◽  
Test Rig ◽  
Friction Measurement ◽  
Inlet Zone ◽  
Sapphire Disc ◽  
Ball On Disc

In the current work, scuffing phenomenon was investigated by a direct observation of a contact area. A ball-on-disc test rig was used, which produced a point contact area between a rotating sapphire disc and a stationary steel ball. Sequence of the friction and photograph in the contact area was synchronously obtained prior to and during occurrences of scuffing. Experiments were conducted in a dry condition and a lubricated condition with hexadecane. In the lubricated condition, wear debris accumulated in the inlet zone entered suddenly into the contact area to sharply increase the friction coefficient. On the other hand, macro plastic flow occurred in the whole contact area in the dry condition during a rapid increase in friction coefficient.

Experimental investigation of the tribological property of low viscosity lubricant under micro confined space

2015 ◽  
Vol 67 (6) ◽  
pp. 594-599
Author(s):  
Shanhua Qian
Keyword(s):  
Tribological Property ◽  
Design Methodology ◽  
Point Contact ◽  
Confined Space ◽  
Flash Temperature ◽  
Content Type ◽  
Shear Rates ◽  
Low Viscosity ◽  
Traction Coefficient ◽  
Ball On Disc

Purpose – This paper aims to present the probable factors resulting in the lubrication failure in detail, based on the experimental study on the tribological property of the low-viscosity lubricant subjected to the different slide/roll ratios and loads under micro confined space. Design/methodology/approach – The interference images and the traction coefficients of the spindle oil with low viscosity were recorded using a ball-on-disc test rig. Moreover, the corresponding flash temperatures were obtained via an analytical method. Findings – More scratches can be observed in the interference images with higher slide/roll ratios. The applied load plays a significant role in the variation of the traction coefficient under different slide/roll ratio, and higher load resulted in lower traction coefficient. The flash temperature generated in the point contact zone non-linearly increases with increasing slide/roll ratio. Originality/value – The flash temperature is not a crucial factor which results in these scratches in the interference images. Moreover, it is probable that the micro confined space is in boundary lubrication at higher shear rates.

Point-contact spectroscopy of quasi-1D conductors with CDW

1999 ◽  
Vol 09 (PR10) ◽  
pp. Pr10-179-Pr10-181
Author(s):  
A. A. Sinchenko ◽  
Yu. I. Latyshev ◽  
S. G. Zybtsev ◽  
I. G. Gorllova
Keyword(s):  
Point Contact ◽  
Point Contact Spectroscopy

Simulating Army-Relevant Spur Gear Contacts with a Ball-on-Disc Tribometer

2015 ◽  
Author(s):  
Mark R. Riggs ◽  
Stephen P. Berkebile ◽  
Adrian A. Hood ◽  
Brian D. Dykas
Keyword(s):  
Spur Gear ◽  
Ball On Disc

Empirical Modelling of Confirmed Covid-19 Cases in Nigeria: Forecasts and Implications

2020 ◽  
Author(s):  
Mutiu Abimbola Oyinlola ◽  
Tolulope Osayomi ◽  
Oluwatosin Adeniyi
Keyword(s):  
Empirical Modelling

A novel approach to the real-time modelling of large urban drainage systems

1997 ◽  
Vol 36 (8-9) ◽  
pp. 19-24 ◽  
Author(s):  
Richard Norreys ◽  
Ian Cluckie
Keyword(s):  
Real Time ◽  
Dynamic Models ◽  
Drainage System ◽  
Radar Data ◽  
Urban Drainage ◽  
Real Time Control ◽  
Empirical Modelling ◽  
Time Control ◽  
Novel Approach ◽  
Non Linear Systems

Conventional UDS models are mechanistic which though appropriate for design purposes are less well suited to real-time control because they are slow running, difficult to calibrate, difficult to re-calibrate in real time and have trouble handling noisy data. At Salford University a novel hybrid of dynamic and empirical modelling has been developed, to combine the speed of the empirical model with the ability to simulate complex and non-linear systems of the mechanistic/dynamic models. This paper details the ‘knowledge acquisition module’ software and how it has been applied to construct a model of a large urban drainage system. The paper goes on to detail how the model has been linked with real-time radar data inputs from the MARS c-band radar.

Modelling for water-based liquid lubrication with ultra-low friction coefficient in rough surface point contact

2020 ◽  
Vol 141 ◽  
pp. 105901 ◽  
Author(s):  
Yanfei Fang ◽  
Liran Ma ◽  
Jianbin Luo
Keyword(s):  
Friction Coefficient ◽  
Rough Surface ◽  
Point Contact ◽  
Surface Point ◽  
Low Friction ◽  
Water Based
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