• TRANSPORT TECHNICS. INVESTIGATION OF ELEMENTS. RELIABILITY

    THREE-DIMENSIONAL SIMULATION OF THERMAL STRESSES IN DISCS DURING AN AUTOMOTIVE BRAKING CYCLE

    Trans Motauto World, Vol. 3 (2018), Issue 4, pg(s) 158-161

    In this study, a 3-Dimensional finite element simulation of a braking cycle including braking and cooling steps is presented. In order to induce thermal stresses, thermo-mechanical material behaviour and interactions between pad and discs are considered in the simulation. The results reveal that compressive and tensile stresses are happening in the braking and cooling steps respectively. Cyclic tensile stresses in the disc of heavy trucks would lead to the initiation of superficial radial cracks in them. The occurrence of hot spot phenomenon in the discs are also observed and discussed thoroughly. The proposed model could be utilized to estimate fatigue life of the braking discs in the automobiles and heavy vehicles..

  • RECOMMENDATIONS ON CLIMATIZED CABINS AND SEATS

    Mechanization in agriculture & Conserving of the resources, Vol. 61 (2015), Issue 11, pg(s) 27-29

    In view of the high risen demands on the machine operator to a safe and high efficient guidance the best possible "workplace situations" must be available. Beside assisted vehicle operation and ergonomically optimized machine interaction particular importance must be attended to individual adjustments as well as climate management. Though for a good climate in the cabin the newest technologies are applied, still the perceived comfort can become disagreeable in spite of air-conditioning. On longer terms the heat as well as the humidity produced by the driver accumulate in the seat and lead to negative sensations, concentration interferences, tiredness and consequently performance losses. Thus the operator’s seat sets a great challenge for agricultural and forestral automotive vehicles already in the matter of ergonomics and safety, concerning hygro-thermal functions however it is probably one of the most complicated development topic. Apart from general interactions between climate situations and best human work performance, assessment and measuring aspects for climate and comfort as well as constructional details for optimized heat and sweat management on drivers’s seats have to be respected.