The equations for wheelchair caster wheel shimmy are presented along with experimental data. The report includes the theory and performance of single wheel casters for a variety of tires, and a new design for wheelchair casters using a grooved dual-tread tire or co-rotating caster wheels. The dual-tread tire was found to significantly inhibit caster shimmy. The turning resistance due to a groov...

there is a complicated relation between cold flat rolling parameters such as effective input parameters of cold rolling, output cold rolling force and exit thickness of strips. in many mathematical models, the effect of some cold rolling parameters has been ignored and the outputs have not a desirable accuracy. in the other hand, there is a special relation among input thickness of strips, the ...

A closed-loop drive–vehicle–road–environment system (DVRES) model was established using Adams/Car and Matlab/Simulink. Dynamic responses of lateral tire forces based on tire–road side friction and road geometric characteristics are used to investigate vehicle side slip for geometric design safety estimation. The root mean square, the maximum values of lateral tire forces, comfort limit on curve...

Abstract Sudden tire failure (a blowout) is a major cause of traffic accidents, many of them involving fatalities. If the automobile can quickly identify that a blowout has occurred, the braking system can be programmed to carry out braking and stability control to slow down the vehicle steadily. Hence, timely identification of a blowout or severe leakage is a key enabler of using the braking s...

Being a typical representative of detailed mechanical tire models ‘below’ true FEM models, the author’s model family FTire (Flexible Ring Tire Model) will be discussed in greater detail here. FTire development started in 1998, using certain ideas and numerical concepts of the author’s ‘coarse-mesh’ FE model DNSTire ([1], [2], [4]) and the spatial non-linear ‘rigid-ring’ model BRIT ([3], [5], [6...

ERP system is based on the ideas and methods of supply chain management,and the integrated information management system is developed on the basis of MRP II, it represents the development trend of management revolution of manufacturing enterprises in the information age. [1]ERP system has strong application values in the tire enterprise, its main purpose is to allocate and balance the enterpris...

The characteristics of tire/road interaction noise are mainly determined by the tread pattern of a tire and it is known that the impact force at leading edge of tire is the main cause of the pattern noise. This study is concerned with the prediction of tire pattern noise: The procedure involves the measurement of the impact force at leading edge, the employment of Hertzian impact theory and lon...

In this paper, multi-objective uniform-diversity genetic algorithm (MUGA) with a diversity preserving mechanism called the -elimination algorithm is used for Pareto optimization of 5-degree of freedom vehicle vibration model considering the five conflicting functions simultaneously. The important conflicting objective functions that have been considered in this work are, namely, vertical accele...

A novel observer structure for vehicle side slip angle (β ) estimation is proposed, in which a local approximation of the nonlinear tire model is adopted. Fuzzy logic approach is adopted to combine the local observer models so as to deal with the nonlinear nature of vehicle dynamics. The derivation of observer’s state equations and the estimation mechanism is developed. By choosing the membersh...

the forging model for cold rolling is one of rolling models that is used in rolling calculations. in this model,the final rolling pressure is an average value and it is not an accurate model.also by using this model,the firction hill curves are plotted due to the central point of the rolling bite length while frictional stresses intersect at the neutral point.in this study, a new model based on...