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  • Author: Ján Dižo x
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Abstract

In this article the strength analyses of weights boxes are presented. Boxes are designed as a welded steel structure at which weights with total mass almost ten tons are stored in them. These boxes are an integral part of a mechanism intended for calibration of the mass measurement device. The article contains on one hand the basic scope of the theory of elasticity and strength analysis and on the other hand the numerical computations of the structure by using the Finite Element Method. Based on results the structure of weights boxes was modified in order to satisfy the defined safety factor.

Abstract

This article is focused on the stress analyses of the welded structure of the device designed to the scales calibrating with maximum loading capacity up to ten tons. The article includes basic knowledges of the theory of elasticity and stress analysis and numerical method called Finite Element Method that were used for the task solution. Cores of the work were stress analyses of selected parts of the designed structure of the device. For stress analyses the ADINA numerical software was used. Results of analyses of the primary design device showed that strength in same locations did not respond to the required maximal load. The structure in critical locations was modified and subsequently reanalyses confirmed the sufficient strength with prescribed safety factor.

Abstract

Passenger ride comfort of road vehicles is one of the most important performances of vehicle. The research of automotive passenger ride comfort is getting more and more important. In this contribution, the multibody model of a three-wheeled vehicle and analyses of passenger ride comfort is presented. The vehicle model and dynamic analyses were performed using the Simpack software package. The dynamic analyses of the vehicle driving were carried out on the road model with different surface quality. Analyses were focused on assessment of the passenger ride comfort on a driver seat.

Abstract

This article deals with computer analyses of output quantities of a railway vehicle depending on changing of parameters of suspension system. A passenger car was chosen for dynamic analyses. An analysed passenger railway vehicle uses two stage suspension system composed of coil springs and hydraulic dampers. Stiffness of coil springs of primary and secondary suspensions were defined for two states and its influence on output values in terms of quality and quantity was evaluated. As output variables, values of forces in a wheel/rail contact and accelerations in several locations on a wagon body floor were chosen. Values of forces in a wheel/rail contact indicate dynamic response of a railway vehicle running in terms of running safety and values of accelerations serve as important input for evaluation of passenger ride comfort.

Abstract

The railway transport network is currently in a quite big expansion. Therefore, railway tracks are modernized and the attention is given also on the technical state of rail vehicles, which operate on them. However, it may happen that the wheel surface is damaged. One of the most common reasons of wheel damage is too much braking, which results to the wheel-flat formation. This article is focused on the evaluation of the influence of a rail vehicle running on the railway track, which a wheel is damaged by the wheel-flat. Investigation of these negative effects was performed by means of simulation computations. As evaluating parameters, values of the wheel force in the contact of the rail and wheel with a flat where observed.

Abstract

The ride comfort for passenger represents an important aspect of a rail vehicle dynamic analysing. The computational software utilisation helps to determine forces and accelerations in various positions through the body of a rail vehicle in order to predict ride properties or evaluate ideas for ride comfort in advance. This article is focused on the dynamic simulation of a rail vehicle running on a real track section. The rail vehicle model creation, computations performance and determination of accelerations badly needed for the ride comfort evaluation is performed in commercial software package.