dc.contributor.advisor | Cvetković, Dragan | |
dc.contributor.other | Praščević, Momir | |
dc.contributor.other | Ćojbašić, Žarko | |
dc.contributor.other | Zuber, Ninoslav | |
dc.contributor.other | Cvjetić, Aleksandar | |
dc.creator | Cvetanović, Boban T. | |
dc.date.accessioned | 2016-08-27T16:00:46Z | |
dc.date.available | 2016-08-27T16:00:46Z | |
dc.date.available | 2020-07-03T16:15:50Z | |
dc.date.issued | 2016-03-25 | |
dc.identifier.uri | http://eteze.ni.ac.rs/application/showtheses?thesesId=3674 | |
dc.identifier.uri | https://nardus.mpn.gov.rs/handle/123456789/6320 | |
dc.identifier.uri | https://fedorani.ni.ac.rs/fedora/get/o:1116/bdef:Content/download | |
dc.identifier.uri | http://vbs.rs/scripts/cobiss?command=DISPLAY&base=70052&RID=2048640352 | |
dc.description.abstract | As a means of farming operations, agricultural tractors have significantly contributed to
production increase and operation efficiency, and facilitated and somewhat eliminated hard
work completely.
On the other hand, during everyday activities tractor drivers are exposed to many negative
influences that have complex detrimental impact on operators’ health and operational
efficiency. Besides noise, precipitations, high humidity, high or low temperature, dust and
chemical pollution, vibrations appear as one of important harmful factors.
Vibrations occur as an effect of an interaction of tractor engine work and rough soil. In
working conditions, the whole vehicle is exposed to complex oscillatory motions that are
transferred from the engine, through transmission and chassis to the cab and further through
the floor, seat and controls to a driver’s body.
From the aspect of harmful effect of vibrations, many studies have indicated tractors as
hazardous machines. Researches in real-life conditions have shown that short, but constant,
exposure to vibrations can result in chest and abdomen pain, shortness of breath, nausea and
vertigo. On the other hand, long-term and constant exposure can lead to physiological,
psychological and psychomotor disorders. Most drivers are not aware of harmful effects of
vibrations, primarily because of simultaneous impact of vibrations and other occupational
risks and detriments.
Vibration harmful effects are obvious in older models of tractors especially, which don’t
have adequate vibration and shock absorption system. That’s because they were made
without good suspension systems which are standard part of all modern models of renowned
manufacturers. Most of the tractors that are used in Serbia are more than 15 years old and
most of them used to be manufactured by IMT (Industrija mašina i traktora – Beograd).
Besides IMT models, Ursus, Zetor and Belarus models are often used. Most of the models of
these manufacturers don’t have suspension systems.
That’s why it is necessary to develop protection systems for these tractors so that drivers
could be protected from vibration and shock harmful effects. Post-production installation of
quality suspension system in the cab or on the axes in older models is an unlikely solution
and is not common. From the financial aspect, that solution is not feasible, because the cost
of installation of a new suspension would be much higher than the price of a used tractor.
Therefore, from the financial and technical aspects, in these circumstances it is better to
improve current seats which will lead to better comfort of the driver and reduced impact of
vibration. All old models have simple mechanical seats. In some models seats have sponge
pads, whereas older models have bare metal seats without any pads. Replacement of older
seats with modern ones that are common in famous manufacturers cannot be optimal
solution because it would mean a huge investment cost for every owner.
Some studies have shown that some simple changes in seat design can reduce vibration
levels more efficiently than much more complex solutions. Simple changes that can be made
on tractor seats are interesting for many farmers because of little cost.
This doctoral dissertation evaluates possibilities of tractor seat oscilatory comfort
optimization by installing vibro-insulators (cushions) on tractor seats, from the aspect of
vibration exposure reduction. Various materials’ capacities to reduce vibrations and prevent
them from spreading to the driver seat were tested. This dissertation is based on experimental
measurements and it considers other experiences in similar vibration level measurements.
Besides the experiments, significant knowledge was acquired from available literature.
The optimal solutions obtained by using multi-criteria analysis and fazzy logic, where the
criteria for selection of the best alternative, ranked in order of importance. | en |
dc.format | application/pdf | |
dc.language | sr | |
dc.publisher | Универзитет у Нишу, Факултет заштите на раду | sr |
dc.rights | openAccess | en |
dc.rights.uri | https://creativecommons.org/licenses/by-nc-nd/4.0/ | |
dc.source | Универзитет у Нишу | sr |
dc.subject | vibracije | sr |
dc.subject | vibration | en |
dc.subject | poljoprivredni traktor | sr |
dc.subject | ljudsko telo | sr |
dc.subject | dnevni nivo izloženosti | sr |
dc.subject | agriculture tractor | en |
dc.subject | human body | en |
dc.subject | daily level of exposure | en |
dc.title | Optimiziranje oscilatorne udobnosti sedišta traktora u funkciji redukcije vibracija | sr |
dc.type | doctoralThesis | en |
dc.rights.license | BY-NC-ND | |
dcterms.abstract | Цветковић, Драган; Зубер, Нинослав; Прашчевић, Момир; Ћојбашић, Жарко; Цвјетић, Aлександар; Цветановић, Бобан Т.; Оптимизирање осцилаторне удобности седишта трактора у функцији редукције вибрација; Оптимизирање осцилаторне удобности седишта трактора у функцији редукције вибрација; | |
dc.identifier.fulltext | http://nardus.mpn.gov.rs/bitstream/id/55004/Disertacija4366.pdf | |
dc.identifier.fulltext | https://nardus.mpn.gov.rs/bitstream/id/55005/Cvetanovic_Boban_T.pdf | |
dc.identifier.fulltext | http://nardus.mpn.gov.rs/bitstream/id/55005/Cvetanovic_Boban_T.pdf | |
dc.identifier.fulltext | https://nardus.mpn.gov.rs/bitstream/id/55004/Disertacija4366.pdf | |
dc.identifier.rcub | https://hdl.handle.net/21.15107/rcub_nardus_6320 | |