|
| |
|
|
Sklízecí mlátičky z hlediska hlučnosti a prašnosti
LÍKAŘ, Ondřej
The thesis is focused on the combine harvester in terms of noise and dust in the cabin, but also outside. The literature search is the basic data and concepts from areas combine harvesters, noise and dust. The actual measurements were carried out on the land at the four farmers. Measured the machines were different dates of manufacture. These are machines Fortschritt E 512 (1983), Fortschritt E 514 (1989), IH 2188 (1998) and Claas Avero 240 (2011). The results of measurement were graphically displayed and compared each other. The measured values were compared with the current legislation. These measurements showed that the noise does not just limit oldest machine. Dustiness been in this job for guidance only. Thanks dust measurements but we get a more complete view of the work environment in which the operator is exposed.
|
|
|
Hodnocení sklízecí mlátičky s rozlišným provedením pojezdového ústrojí
BARÁK, Jan
This thesis describes chassis design of combine harvester and its types generally. This thesis is focused on Claas Lexion 750 Terra Trac Helmut combine harvester with crawler chassis. For each selected chassis and systems by global manufacturers of agricultural machinery are described main parts and their possible variants. Thesis includes practical methodical measurements, which provides details for the assessment of the losses, spreading quality, crushing quality, operating parameters, machine performance and fuel consumption. Next the effect of moisture on the losses, quality of spreading and crushing is evaluated. Furthermore, I compare effect of crawler chassis on performance and in the end is a simple analysis of investmend and operating costs and characteristics of the company. The aim of the thesis is to evaluate operation and work quality of combine harvester with crawler chassis at harvest of cereals and rapeseed in agricultural production and simple economical evaulation of the machine.
|
|
|
Provozní hlučnost sklízecích mlátiček ve vybraném zemědělském podniku
FOJT, Miroslav
The bachelor thesis discusses the noise combine harvesters at the operator for different operating modes. They were measured in three combine harvesters of different ages. The first part deals noise, development and construction of combine harvesters. In the following part, the merasued values are assembled and processed in graphs. In conclusion, the combine harvesters are evaluated in terms of noise pollution and the results are compared with the valid legislation
|
|
|
Development of a Variable Roller Pump and Evaluation of its Power Saving Potential as a Charge Pump in Hydrostatic Drivetrains
Zavadinka, Peter ; Strážovec,, Igor (referee) ; Turza,, Jozef (referee) ; Grepl, Robert (advisor)
Predložená doktorandská dizertačná práca (ďalej len práca) sa zaoberá rozsiahlou analýzou valčekového hydrogenerátora s premenlivým geometrickým objemom a predikciou výkonových úspor dosiahnutých aplikáciou navrhnutého valčekového hydrogenerátora s premenlivým geometrickým objemom v hydrostatickom pohone vybraných mobilných pracovných strojov. Teoretický rozbor princípov fungovania valčekového hydrogenerátora a teória jednorozmerného simulačného modelu sú popísané v prvej časti práce. Na základe odvodenej teórie je vytvorený simulačný model, ktorý je vhodný na predikciu priebehu tlaku v komorách valčekového hydrogenerátora, síl pôsobiacich na valček a na predikciu vnútorných únikov vzniknutých skratovaním rozvodovej dosky, ktoré majú priamy vplyv na objemovú účinnosť valčekového hydrogenerátora. Simulačný model bol úspešne použitý pre optimalizáciu rozvodových dosiek valčekového hydrogenerátora a vhodnosť simulačného modelu potvrdili následné merania Práca obsahuje aj analýzu síl pôsobiacich na vodiaci prstenec, ktorej výsledky boli taktiež potvrdené meraním. Analýza týchto síl môže vylepšiť v konečnom dôsledku parametre budúcich tlakových regulácii. Práca ďalej obsahuje základné porovnanie použitých tlakových regulácii. Všetky uskutočnené merania potvrdili, že valčekový hydrogenerátor s premenlivým geometrickým objemom s testovanými tlakovými reguláciami je schopný úspešne pracovať v hydrostatickej prevodovke. Druhá časť práce analyzuje potenciál výkonových úspor valčekového hydrogenerátora s premenlivým geometrickým objemom pre dve mobilné aplikácie - teleskopický nakladač s hmotnosťou 9 ton a kombajn s hmotnosťou 20 ton. Analýza vyžaduje jednorozmerný simulačný model hydrostatického pohonu s teplotnou predikciou hydrostatickej prevodovky. Dva rozdielne koncepty variabilného doplňovacieho systému hydrostatickej prevodovky sú porovnané so štandardným doplňovacím systémom pre pracovný a transportný režim oboch vybraných typov vozidiel. Simulácia pohonu vozidla s valčekovým hydrogenerátorom s premenlivým geometrickým objemom vo funkcii doplňovacieho hydrogenerátora a obtokovou clonou potvrdili vyššie úspory iba v prípadoch, kedy rýchlosť doplňovacieho hydrogenerátora bola výrazne vyššia a prietok cez obtokovú clonu do skrine hlavného hydrogenerátora zabezpečil dostatočné chladenie. Najvyššie výkonové úspory boli dosiahnuté s premenlivým preplachovacím systémom, ktorého prietok sa menil podľa požiadaviek hydrostatickej prevodovky. Záver druhej časti práce sa zaoberá metodikou dimenzovania veľkosti doplňovacieho hydrogenerátora.
|
|
|
Threshing system of combines harvester
Štelcl, Michael ; Červinka, Jan (referee) ; Škopán, Miroslav (advisor)
This bachelor thesis is about evaluation of maximum throughput of straw and grain together, in various types of threshing units which are used in combine harvesters. It provides basic informations about two types of combine field-test procedures. In the end of work is shortly describe current development of combine harvesters and contain two proposals of alternative constructions of threshing units according to author of this bachelor thesis.
|
|
| |
|
|
Evaluate the combine harvester with tracked chasses in agricultural production
NOHAVA, Pavel
Aim of this work was to evaluate the activity and quality of forage harvesters CLAAS Lexion 770 TerraTrac at harvest of cereals and oilseed rape in the business of agricultural production. The quality of work of the combine was assessed by grain loss during harvesting, crushing quality, quality variance, the effect of moisture on the loss of quality crushing and quality variance crop residues. Another aim was to analyze the performance, fuel consumption and simple economic evaluation, together with the basic characteristics of the owner machines.
|
|
|
The noise of a harvest line during cereals harvest
BÁRTŮ, Lukáš
The thesis focuses on harvest of cereals in terms of noise pollution. Sources of noise during harvesting are harvest line (combine harvester), manipulation equipment transporting harvested grain (tractors with trailers) and in some cases harvesters straw (tractors with collectors). The main aim of this work is to measure noise at harvest on the outskirt of the crop land. In this work I focused on the selection of suitable observation post, measurement of noise pollution of particular agricultural machines, background noise measurement and evaluation of climatic conditions. Furthermore, acquired data are used for equivalent noise level calculations and evaluation against current legislation. Based on the data analysis can be concluded that noise pollution during harvest does not negatively impact its surroundings, therefore there is no need for any action to reduce noise exposure.
|
|
|
Rating combine harvesters John Deere 9880 and New Holland CR 9080 at harvest of cereals and oilseed rape.
WEBER, Michal
The aim of this thesis was to compare the activity and quality of work of the combine harvester New Holland CR 9080 and John Deere 9880 STS at harvest of cereals and oilseed rape and their simple economic evaluation. The thesis was focused on comparing losses and influence of moisture of harvested crops on the size of the losses, on the quality of crushing and the spreading of plant residues. Then the inf luence of moisture of harvested crops on the quality of crushing and the spreading of plant residues, analysis of performance and consumption of diesel were compared.
|
guest ::
