Authors:
Ernő Horváth Corvinus University Of Budapest Budapest Hungary

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György Sitkei University of West-Hungary Sopron Hungary

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In the last decade considerable progress was achieved in the theory of tree shakers used for fruit harvesting. New calculation methods were developed including the vibrating soil mass which enabled the calculation of effective soil masses on a strictly physical basis. However, these earlier investigations did not treat with the effect of stroke frequency. In these investigations, first of all, the friction behavior of the soil mass is discussed as a function of stroke frequency. It turned out that the decrease and shifting of the soil deformation waves as a function of distance measured from the tree trunk are the main sources of an intensive friction between the neighbouring soil layers. As a consequence, the logarithmic decrement (and not the damping coefficient) of the soil will be more or less constant as a function of stroke frequency, at least in the investigated frequency range. At lower attachment heights the soil friction losses dominate independently on stroke frequency. The virtual spring constant of the soil body is also frequency dependent. Due to the presence of combined frictional and viscous losses, the energy method seems to be the best one to analyze the effect of stroke frequency on the various operational parameters.

  • Horváth, E. and Sitkei, G. (2001) Energy consumption of selected tree shakers under different operational conditions. J. Agr. Eng. Res., pp. 191–199.

  • Horváth, E. and Sitkei, G. (2005) Damping properties of plum trees shaken at their trunks. Trans of ASAE, pp. 19–25.

  • Horváth, E. (2007) Basics of Mechanical Fruit Harvesting. In: Technical Aspects of Horticultural Production. MGI Books, pp. 23–77.

  • Den Hartog, J. (1931) Forced vibrations with combined coulomb and viscous friction. Trans of the ASME, pp. 107–115.

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Senior editors

Editor(s)-in-Chief: Felföldi, József

Chair of the Editorial Board Szendrő, Péter

Editorial Board

  • Beke, János (Szent István University, Faculty of Mechanical Engineerin, Gödöllő – Hungary)
  • Fenyvesi, László (Szent István University, Faculty of Mechanical Engineering, Gödöllő – Hungary)
  • Szendrő, Péter (Szent István University, Faculty of Mechanical Engineering, Gödöllő – Hungary)
  • Felföldi, József (Szent István University, Faculty of Food Science, Budapest – Hungary)

 

Advisory Board

  • De Baerdemaeker, Josse (KU Leuven, Faculty of Bioscience Engineering, Leuven - Belgium)
  • Funk, David B. (United States Department of Agriculture | USDA • Grain Inspection, Packers and Stockyards Administration (GIPSA), Kansas City – USA
  • Geyer, Martin (Leibniz Institute for Agricultural Engineering and Bioeconomy (ATB), Department of Horticultural Engineering, Potsdam - Germany)
  • Janik, József (Szent István University, Faculty of Mechanical Engineering, Gödöllő – Hungary)
  • Kutzbach, Heinz D. (Institut für Agrartechnik, Fg. Grundlagen der Agrartechnik, Universität Hohenheim – Germany)
  • Mizrach, Amos (Institute of Agricultural Engineering. ARO, the Volcani Center, Bet Dagan – Israel)
  • Neményi, Miklós (Széchenyi University, Department of Biosystems and Food Engineering, Győr – Hungary)
  • Schulze-Lammers, Peter (University of Bonn, Institute of Agricultural Engineering (ILT), Bonn – Germany)
  • Sitkei, György (University of Sopron, Institute of Wood Engineering, Sopron – Hungary)
  • Sun, Da-Wen (University College Dublin, School of Biosystems and Food Engineering, Agriculture and Food Science, Dublin – Ireland)
  • Tóth, László (Szent István University, Faculty of Mechanical Engineering, Gödöllő – Hungary)

Prof. Felföldi, József
Institute: MATE - Hungarian University of Agriculture and Life Sciences, Institute of Food Science and Technology, Department of Measurements and Process Control
Address: 1118 Budapest Somlói út 14-16
E-mail: felfoldi.jozsef@uni-mate.hu

Indexing and Abstracting Services:

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2023  
Scopus  
CiteScore 1.8
CiteScore rank Q2 (General Agricultural and Biological Sciences)
SNIP 0.497
Scimago  
SJR index 0.258
SJR Q rank Q3

Progress in Agricultural Engineering Sciences
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Progress in Agricultural Engineering Sciences
Language English
Size B5
Year of
Foundation
2004
Volumes
per Year
1
Issues
per Year
1
Founder Magyar Tudományos Akadémia  
Founder's
Address
H-1051 Budapest, Hungary, Széchenyi István tér 9.
Publisher Akadémiai Kiadó
Publisher's
Address
H-1117 Budapest, Hungary 1516 Budapest, PO Box 245.
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Chief Executive Officer, Akadémiai Kiadó
ISSN 1786-335X (Print)
ISSN 1787-0321 (Online)

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