http://hdl.handle.net/2173/31419 Thu, 23 May 2013 12:02:21 GMT 2013-05-23T12:02:21Z http://hdl.handle.net/2173/31420 Title: Modelling the behaviour of freight vehicles Authors: Iwnicki, Simon D.; Stow, Julian M. Description: This paper was presented at the Institution of Civil Engineers Railway Seminars - The Interaction of Vehicle and Track Design, 20th May 1998. Wed, 20 May 1998 00:00:00 GMT http://hdl.handle.net/2173/31420 1998-05-20T00:00:00Z http://hdl.handle.net/2173/30563 Title: An experimental study of independently rotating wheels for railway vehicles Authors: Liang, Bo; Iwnicki, Simon D. Description: This paper was presented at the IEEE International Conference on Mechatronics and Automation (ICMA), Harbin, Heilongjiang, China, 5-th to 8th August 2007. Mon, 01 Jan 2007 00:00:00 GMT http://hdl.handle.net/2173/30563 2007-01-01T00:00:00Z http://hdl.handle.net/2173/30306 Title: Calculation of wear on a corrugated rail using a three-dimensional contact model Authors: Xie, Gang; Iwnicki, Simon D. Abstract: This paper presents the results from simulations of railhead wear using a three-dimensional contact model. The wheel/rail contact is modelled as non-Hertzian and non-steady based on the Variational Method [J.J. Kalker, Three-Dimensional Elastic Bodies in Rolling Contact, Kluwer Academic Publishers, 1990] and the wear is assumed to be proportional to the frictional work. A wheel rolling over initial sinusoidal roughnesses is considered and when constant values of normal force and creepage are used, it is found that the maximum wear occurs at positions close to the crest of the initial wavelength and therefore roughness is not predicted to grow. A range of prescribed dynamic normal forces were then used to investigate the relationship between wear and dynamic force but again, no corrugation growth mechanism was revealed. Wear calculations using both Hertzian and non-Hertzian contact are compared and the significance of the non-Hertzian effects on the wear calculation is shown. Description: Full-text of this article is not available in this e-prints service. This article was originally published following peer-review in Wear, published by and copyright Elsevier. Thu, 30 Oct 2008 00:00:00 GMT http://hdl.handle.net/2173/30306 2008-10-30T00:00:00Z http://hdl.handle.net/2173/30305 Title: Simulation of wear on a rough rail using a time-domain wheel–track interaction model Authors: Xie, Gang; Iwnicki, Simon D. Abstract: This paper presents results from simulations of railhead wear due to initial sinusoidal and broad-band roughness using a time-domain wheel–track vertical interaction model integrated with a three-dimensional wheel–rail contact model. As typical roughness wavelengths are short and frequencies are high compared with vehicle body motions, the vehicle is simplified to an unsprung wheel mass. The rail is modelled as a Timoshenko beam discretely supported by pads, sleepers and ballast. The wheel–rail contact in the interaction model is modelled with a non-linear Hertzian contact spring. The obtained wheel–rail forces are then incorporated into the three-dimensional contact model to calculate wear over the railhead. The wheel–rail contact is modelled as non-Hertzian and non-steady based on the Variational Method [G. Xie, S.D. Iwnicki, Calculation of wear on a corrugated rail using a three-dimensional contact model, in: Proceedings of the Seventh International Conference on Contact Mechanics and Wear of Rail/Wheel Systems, Brisbane, Australia, Materials Australia, 2006] and the wear is assumed to be proportional to the friction work. Cases of both a free and a driven wheel with a constant torque are considered. The phase angles between dynamic wheel–rail force and roughness are examined and wear is found to be almost in-phase with roughness and therefore, no roughness growth is predicted by the model as presented in its current form. Although clearly in contradiction to reality where roughness grows under certain conditions this work leads to interesting question about why roughness growth is predicted by a simple contact model but not when complexity is increased to include non-Hertzian and non-steady contact conditions. Description: Full-text of this article is not available in this e-prints service. This article was originally published following peer-review in Wear, published by and copyright Elsevier. Tue, 01 Jan 2008 00:00:00 GMT http://hdl.handle.net/2173/30305 2008-01-01T00:00:00Z