THE EQUILIBRIUM EQUATIONS OF THIN-WALLED OPEN SECTION BARS IN TERMS OF CO-ORDINATES OF CENTRE OF GRAVITY

To describe the equilibrium equations of thin walled open section bars the co-ordinates of centre of shearing are generally used. On the other hand, the equilibrium equations of closed section bars mostly are described by the co-ordinates of centre of gravity. Modelling simultaneously open and closed section bars in a framework it is expedient to apply the same type of co-ordinates. For this purpose the co-ordinates of centre of gravity are suitable. For elaboration of equilibrium equations of thin walled bars ill terms of co-ordinates of centre of gravity the principle of total potential energy is applied

NON-LINEAR DYNAMIC ANALYSIS OF VEHICLES USING LARGE FINITE ELEMENT MODELS

In the dynamic analysis and design of vehicles the behaviour of suspensions and tyres beyond the linear range is often interesting. In order to get acceptable responses it is necessary to apply large mechanical models with many degrees of freedom. In this paper a computational method and a computer progrc.m, developed for the dynamic analysis of elastic systems containing local non-linearities are presented. The applicability of this method and program is demonstrated by numerical experiments using a 648 degrees of freedom flat-bed truck finite element model

RESPONSE SPECTRUM ANALYSIS OF LARGE VEHICLE SYSTEMS

The dimensioning of vehicle body structures for service fatigue life is a highly complicated task in its every stage. Namely the appropriate structural modelling for dynamic analysis and the elaboration of realistic loading and design conditions (loading and design spectra) for the total duration of their life. In this paper the dynamic analysis of a bus is presented as a feasibility study using finite element model of large number of degrees of freedom

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ANALYSIS OF TRANSIENT VIBRATIONS OF A TRUCK UNDERCARRIAGE DUE TO ROAD UNEVENNESSES

In the bar-model dynamic analysis of truck undercarriage frames of open-section bars, dynamic equilibrium equations in terms of either centroid or shear centre coordinates of the bar cross section are equally useful. Results obtained in the computer analysis of transient vibrations of a truck undercar- riage by the two different equilibrium equations have been compared. Also simulation of wheel bouncing while crossing a road defect has been concerned with

A gazdasági válság lehetséges környezeti ajándékhatásai a visegrádi négyek országaiban

There are numerous studies of the negative short-run effects of the financial and economic crisis of 2008 on the society and economy. In this paper, we analyse the possible environmental side-effects in the countries of Visegrad Four as a gift of the crisis and the permanence of these “gift-effects” in the long run. Since population does not change significantly, in our region the anthropogenic pressure on the ecological systems is fed by two processes, namely by production and consumption. We use two indicators of the input side of Material Flow Analysis (MFA), which is a set of environmental indicators that describes social metabolism. By applying Direct Material Input (DMI) and Total Material Requirement (TMR) we study the chances of the process of dematerialisation between 1996 and 2011, which process is urged by many