Numerično in eksperimentalno vrednotenje nosilne konstrukcije štirirotorskega zgrabljalnika travinja

magistrsko delo magistrskega študijskega programa II. stopnje Strojništvo

Blaž Kozjek (Author), Domen Šeruga (Mentor), Marko Nagode (Co-mentor)

Abstract

Na nosilno konstrukcijo štirirotorskega zgrabljalnika med mirovanjem delujejo statične obremenitve v obliki lastne teže. Pri obratovanju in transportu je ta izpostavljena še dinamičnim obremenitvam iz obratovalnega okolja. Nosilna konstrukcija predstavlja osnovo stroja, zato je potrebno zagotoviti zadostno trdnost le-te. Za vrednotenje trdnostne ustreznosti obstoječe nosilne konstrukcije so bile izvedene numerične trdnostne analize, kjer je bila zajeta celotna nosilna konstrukcijo zgrabljalnika. Obravnavali smo različna obremenitvena stanja, v katerih se stroj lahko nahaja. Z namenom primerjave rezultatov simulacij in meritev so bile opravljene meritve deformacijskega odziva na dveh mestih konstrukcije. Na merilni mesti so bile nalepljene merilne rozete za merjenje specifičnih deformacij, ki so posledica mehanskih obremenitev. Na osnovi rezultatov izvedenih numeričnih analiz so bila izpostavljena kritična mesta na konstrukciji. Podani so bili predlogi za konstrukcijske spremembe, s katerimi bi pripomogli k povečanju trdnosti na teh mestih. Zadovoljivo ujemanje rezultatov meritev in simulacij na merilnem mestu 1 in zelo dobra skladnost rezultatov na merilnem mestu 2 potrjujeta, da so bile numerične analize ustrezno izvedene.

Keywords

magistrske naloge;kmetijski stroji;obremenitveni primeri;trdnostne analize;varjene konstrukcije;merilne rozete;meritve deformacij;

Data

Language:	Slovenian
Year of publishing:	2019
Typology:	2.09 - Master's Thesis
Organization:	UL FS - Faculty of Mechanical Engineering
Publisher:	[B. Kozjek]
UDC:	631.3:539.4:519.6(043.2)
COBISS:	16858139
Views:	920
Downloads:	249
Average score:	0 (0 votes)
Metadata:

Other data

Secondary language:	English
Secondary title:	Numerical and experimental analysis of a four-rotor rake chassis
Secondary abstract:	During standstill, static loads in the form of self-weight are acting on the four-rotor rake chassis. Moreover, while operating or the machine is transported, it is subjected to dynamical loads from operating environment. Sufficient strength of the machine chassis must be ensured, as it represents the base of the four-rotor rake. Numerical structural analyses were performed to validate the structural suitability of the current chassis. The complete chassis of the rake was included in the analyses. Different stress states the machine can assume, were analysed. Strain data were recorded on two locations of the machine chassis for further comparison of measurement and simulation results. For mechanically induced strain measurement, we placed strain rosettes on the measuring points. Critical locations on the machine chassis were pointed out upon examining the structural analyses results. Structural changes, which should increase the durability at critical locations, were proposed. Satisfactory correspondence of measurement and simulation results on measuring point 1 and very high uniformity of the results on measuring point 2, confirm the numerical structural analyses were carried out correctly.
Secondary keywords:	agricultural machinery;load case;structural analysis;welded chassis;strain rosette;strain measurement;
Type (COBISS):	Master's thesis/paper
Study programme:	0
Embargo end date (OpenAIRE):	1970-01-01
Thesis comment:	Univ. Ljubljana, Fak. za strojništvo
Pages:	XXVII, 116 str.
ID:	11210420