It has been shown recently that the shimmy motion of towed wheels can be predicted in a wide range of parameters by means of the so-called memory effect of tyres. This delay effect is related to the existence of a travelling-wave-like motion of the tyre points in contact with the ground relative to the wheel. This study shows that the dynamics within the small-scale contact patch can have an es...

Epicutaneous patch testing is the gold standard method for the diagnosis of allergic contact dermatitis. Despite this knowledge, many clinical dermatologists do not offer patch testing in their offices or offer testing with only a limited number of allergens. Introduced in 1995, the Thin-Layer Rapid Use Epicutaneous Test originally contained 23 allergens and one control. In 2007, five additiona...

Smart aspects in development of a wheel-based robot which is capable to climb stairs autonomously are presented. Autonomy connotes the ability to climb stairs without any mechanical contact to environment except ground contact with wheels. A comparison of wheel-based to other known locomotion systems is given. Advantages of wheel-based systems are emphasized. The presented Stair Climber (SC) ro...

the ability to perform rolling contact fatigue (rcf) experiments in wheel–rail material is provided by a new small–scale test rig, manifesting the actual dynamic behaviour of the railway system. in this paper, a multi-body dynamics (mbd) model is proposed, simulating the vibration behaviour of the prescribed rig. the new testing facility is modelled using a three-dimensional model of the vehicl...

In this study, a wheel-rail transient rolling contact model capable of accounting for the nonlinear displacement-force properties hanging sleepers is proposed. The sleeper status affected by rail irregularities an input analysis behavior and related degradation in terms plastic deformation fatigue. results indicate that severity significantly geometric characteristics relative position with res...

This paper aims to study the mechanism of coolant penetration into a wheel-work contact zone when a segmented or conventional wheel is used in surface grinding. Based on the principles of fluid motion and considerations of spin-off and splash, analytical models for both conventional and segmented wheels were developed for predicting the power of pumping coolant into the contact zone. It was rev...

Abstract Piezoelectric harvesters are environmentally sustainable alternative electrical production technologies aimed at supplying small autonomous devices. The particular application in roads has significant potential. However, there discrepancies about the effectiveness of these harvesters, and their costs limit market expansion abilities. In this context, a novel harvester approach is explo...

The results of experiments on the estimation error methods experimental and calculated determination contour area for ecological assessment a mobile energy device are presented. There was used example modern radial tires 360/70R24 Bel-89 18.4R34 F-11 agricultural tractor MTZ-1025.2. in modes non-nominal loading at nominal load changes tire pressure within range recommended field work. assess po...

Hunting is a potentially dangerous phenomenon related to the lateral oscillation of wheels that impacts rails and causes wear infrastructure’s components. Therefore, analysis timely detection hunting can lead application corrective maintenance tasks, reducing damages, costs even derailments as result. In this work, vibration response finite element model rail with hunting-induced loads by singl...

Twin-disc tests present some limitations for wheel-rail wear characterization such as the obtained contact patch and error very low creepages. In this work, creepage phenomena are investigated ranging from 0.12% to 2.45%. To improve fitting of experimental with theoretical adhesion curve, a modification FASTSIM algorithm is proposed. A linear correlation has been found between slip area includi...