Search

Search Results

• Neural Network Based Enveloping Model of Agricultural Tyre

  214-222

  Boris Stojic

  Views:

  67

  The vibration properties of agricultural tractor’s tyres significantly influence its response in terms of the exposure of the human operator to mechanical vibrations, which is still one of the key problems in the design and exploitation of tractors. The behaviour of the tyre in this sense is significantly influenced by the mechanism ofgeometric filtering of the short-wavelength unevenness of the unprepared ground mostly encountered by tractor during in-field operations. Herein, this aspect of tyre behaviour was studied with tyre rolling quasistatically over singular obstacle. Based on experimental results, neural network based model of tyre enveloping behaviour was developed. Main model properties are high computational efficiency, simplicity regarding number of input quantities and absence of the need for explicit parametrization etc. Main shortcomings of modelling approach used are high developing effort, labour-intensive experimental preparations and lack of flexibility regarding tyre design and operating parameters

• Calculations of Performance Losses for Automobile Vehicles

  210-218

  Ferenc Szodrai

  Sándor Pálinkás

  György Juhász

  Views:

  197

  Vehicle-energetic-models are used to analyze the performances and when a comprehensive structure is established even optimization could be done. For these kinds of models, the losses of the vehicles have to be known. These losses could significantly effect of the vehicle fuel consumption. From these losses the rolling resistance, drive elements and aerodynamic drag are discussed. This paper reviews some of the literatures that describes the calculation methods and gives us some idea about the degree of their value. Our further goals are to have an UpToDate loss coefficient dataset and calculation methods for further vehicle-energetic modelling.

• Visual Analysis and Geometric Modeling of Metal Foams

  89-92

  Tamás Antal Varga

  Tamás Mankovits

  Views:

  87

  The development of an efficient procedure for 3D modelling and finite element simulation of metal foams
  is one of the greatest challenges to engineer researchers nowadays. Creating 3D CAD model is alone a demanding
  engineering task due to its extremely complex geometry, and the proper finite element analysis process is still in the
  center of the research. The aim of this project is to analyze the related literature and to adapt the results may be
  considered.