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Model of simulation stress propagation in soil generated by tires of agricultural machines

Marcin Zabielski

Abstract

The purpose of this dissertation was the analysis of wheel interaction of dive unit to ground with the use of FEM. The first element was to design the digital model of agricultural driving tire with consideration to geometrical features of the tread. Likewise, the soil unit was modelled and the rim adjusted to a selected tire. All three elements were combined with one another with the use of CAD tools. To the received system of the elements there were matched material values answering the real values. Consequently, on the digital vehicle-area model was placed the grid of completed elements. The model was subjected to loading with the traction happening in natural environment. Two kinds of engineering analysis was performed. The first one dealt only with the vertical loading of the vehicle-area system, the further ones the turning moment was added. The results of the stress propagation in the soil unit, achieved through engineering tools, were confronted with the ones received by Assistant Prof. Lech Jakliński, Ph.D. habil. Eng. through laboratory methods. To the schemes displaying the change of stress values the function lines were approximated. The best adjusted trend line to the existing stress values appeared to be power function/ exponentiation dependency. In the further part of the dissertation the sensitivity analysis was conducted. Through the change of the boundary conditions describing the basic values of the soil unit, a few stress distributions were received answering the particular parameters. The assumption of the undertaken research was to substitute the empirical methods with digital methods. The traditional research were based on the construction of soil channels in which it was necessary to perform the use of tyre repeatedly. Modern engineering programming can significantly decrease the costs by reducing the time of the research. The results received through CAD methods can easily be confronted by changing the boundary conditions, which was also presented in this dissertation.
Record ID
WUT09a2d82238f14179a5419d9e4ad0c94e
Diploma type
Doctor of Philosophy
Author
Marcin Zabielski Marcin Zabielski,, Undefined Affiliation
Title in Polish
Model symulacji propagacji naprężeń w glebie generowanych przez opony maszyn rolniczych
Title in English
Model of simulation stress propagation in soil generated by tires of agricultural machines
Language
(pl) Polish
Certifying Unit
Faculty of Civil Engineering, Mechanics and Petrochemistry (FCEMP)
Discipline
mechanical engineering / (technology domain) / (technological sciences)
Status
Finished
Start date
26-03-2013
Defense Date
20-10-2015
Title date
27-10-2015
Supervisor
External reviewers
Jan Szczepaniak Jan Szczepaniak,, Undefined Affiliation
Włodzimierz Kęska Włodzimierz Kęska,, Undefined Affiliation
Honored
yes
Pages
114
Keywords in English
tire – soil contact, finite element method, stress in contacts, stress in soil, computer aided design
Abstract in English
The purpose of this dissertation was the analysis of wheel interaction of dive unit to ground with the use of FEM. The first element was to design the digital model of agricultural driving tire with consideration to geometrical features of the tread. Likewise, the soil unit was modelled and the rim adjusted to a selected tire. All three elements were combined with one another with the use of CAD tools. To the received system of the elements there were matched material values answering the real values. Consequently, on the digital vehicle-area model was placed the grid of completed elements. The model was subjected to loading with the traction happening in natural environment. Two kinds of engineering analysis was performed. The first one dealt only with the vertical loading of the vehicle-area system, the further ones the turning moment was added. The results of the stress propagation in the soil unit, achieved through engineering tools, were confronted with the ones received by Assistant Prof. Lech Jakliński, Ph.D. habil. Eng. through laboratory methods. To the schemes displaying the change of stress values the function lines were approximated. The best adjusted trend line to the existing stress values appeared to be power function/ exponentiation dependency. In the further part of the dissertation the sensitivity analysis was conducted. Through the change of the boundary conditions describing the basic values of the soil unit, a few stress distributions were received answering the particular parameters. The assumption of the undertaken research was to substitute the empirical methods with digital methods. The traditional research were based on the construction of soil channels in which it was necessary to perform the use of tyre repeatedly. Modern engineering programming can significantly decrease the costs by reducing the time of the research. The results received through CAD methods can easily be confronted by changing the boundary conditions, which was also presented in this dissertation.
PKT classification
podstawy budowy maszyn
KBN classification
budowa i eksploatacja maszyn
Thesis file

Uniform Resource Identifier
https://repo.pw.edu.pl/info/phd/WUT09a2d82238f14179a5419d9e4ad0c94e/
URN
urn:pw-repo:WUT09a2d82238f14179a5419d9e4ad0c94e

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