This master thesis deals with the influence of the type of tractor chassis on its utility properties. For the rating were used tractors John Deere 8 – series with wheel and track chassis, equipped with the same engine and gearbox, which were carried out for laboratory and field tests. The aim of laboratory tests was the exclusion of the difference in engine power of both tractors and the aim of field tests was to evaluate the drawbar properties of tractors with a different type of chassis. The reference parameter was especially drawbar pull, further drawbar power, slip and fuel consumption. Based on the tabular and graphical elaboration of the measured values were evaluated results.

In this master thesis is analyzed the current situation in the construction chassis of tractors, in addition, a methodology for evaluating the impact of influences on drawbar properties of tractors. The main objective of this work was to analyze and conclude the measured drawbar properties of selected tractor same power and weight categories with different chassis designs. Measured and calculated values were tabular and graphically presented. When evaluating the drawbar properties were determined according tractive power and slip depending on the drawbar forces.

The thesis summarizes the results of the measurement of the output parameters of the tractor, on which were mounted three different types of tires. The measured parameters are the maximum pulling power, slippage, specific effective fuel consumption at the maximum pulling performance. The final measured and calculated results are presented in tables and graphs. The results of the measurements were processed by the use of regressive analysis.

Unmanned ground vehicles (UGVs) will increasingly be used for tasks such as retrieving injured soldiers from a battlefield, transporting supplies, and towing other small vehicles and payloads. To date, the unmanned test community has not standardized on an apparatus or test operating procedure (TOP) specifically for evaluating the towing capacity of small unmanned ground vehicles. Draw-bar testing has been adapted by several groups to quantify small unmanned ground vehicle (SUGV) tow capacity; however, these devices are inherently limited to measuring peak static towing force. This paper describes an alternative method using a variable-resistance tow sled for quantifying the dynamic towing capacity of SUGVs. The tow sled contains a frontal skid plate and a rear axle and wheel arrangement. A weighted carriage is transferred from the rear of the sled to the front of the sled by a cable geared to the rear axle. As the sled is pulled along the ground, towing resistance increases in a controlled linear fashion. An encoder on the rear axle and a load cell in the tow chain provide motion and force data. Testing of the tow sled has been conducted on a TALON SUGV at the Southwest Research Institute (SwRI) Small Robot Test Facility and a MATILDA SUGV at the Joint Unmanned Systems Test, Experimentation, and Research (JOUSTER) site. / Master of Science

This diploma thesis “Analysis of powertrain impact on pull power capacity of a tractor” is focused on evaluation of measured data gained from performance testing of tractors Claas Arion 640 for two different types of transmission. There are also discussed the measuring methods and there is detailed described the function of measured transmissions.

The thesis deals with the analysis of the structure of the chassis and the drawbar of the trailed sprayer. The introductory part is theoretical and describes the methods of plant protection and mechanization associated with it. In addition, this part is dedicated to sprinklers, their function and the design of individual machines. Sprayers mainly describe the design of sprung and unscrewed axles and sprung and unsprung drawbar of other manufacturers. The practical part is focused on the combination of these axles and axles and on the analysis of their design solutions and a whole range of aspects. Conclusions of the thesis are recommended combinations of the mentioned structural elements.

Det har dykt upp en mängd nya s.k. Hammondkloner på marknaden i försök att digitalt återskapa Hammondsoundet. Syftet med denna studie är att utforska om Hammondorgeln har ersatts av digitala Hammondkloner i musikutbildning på högskola, folkhögskola och inom privatundervisningen i Sverige. Studien genomfördes metodiskt med tre kvalitativa forskningsintervjuer och observation av två privatundervisningar i Hammondorgel. Resultatet är att det går att utbilda sig i att spela Hammondorgel B3 med Leslie 122 på högskola och inom privatundervisning i Sverige och att Hammondorgeln ännu inte har ersatts helt av Hammondkloner i undervisning i att spela Hammondorgel. Det är däremot ovisst huruvida man kan utbilda sig att spela riktig Hammondorgel på folkhögskola av det som framgår utav min forskning.

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A drawbar pull (DP) test procedure was developed at the NASA Glenn Research Center (GRC) for testing and developing designs for off-road vehicles. The motivation was to develop a procedure that would produce repeatable results and could be replicated by other researchers. While developing the test methodology, it became apparent that there was a certain degree of scatter in the results among identical tests. In order to characterize the disparities, an experimental study was conducted consisting of systematically varying specific test parameters. The selected performance metric was the DP-TR (travel reduction) relation. The selected parameters were: 1) the starting terrain condition, 2) the distance traveled by the vehicle under an applied, constant DP force, and 3) the density of the prepared terrain. Respectively, these parameters were selected to observe: 1) how differences in the starting area, or "launch pad," would affect the resulting performance of a test, 2) if a steady-state region of performance exists and how does performance change with the distance traveled, and 3) the relationship between prepared terrain density and performance. These experiments were conducted in a dry, granular, cohesionless, silica based soil called the GRC-1 Lunar Soil Simulant. The results of these studies were that the variations in both the starting terrain condition and the distance traveled did not significantly affect performance. The relationship between performance and terrain density was that only in a region of low density was the TR constant; subsequently, the TR decreased steadily with increasing density. / Master of Science

This research has investigated the effect of tyre rutting of wheeled construction plant performance traversing in wet and deformable terrain, specifically clay and sand. The purpose was to translate the wheel rutting into performance reduction measured in drawbar-pull. The ultimate goal was to translate the power loss into practical effects on cost, time and other economic variations on construction projects that are characterised by movement of wheeled plant on long haulage deformable roads. In order to achieve this aim, mathematical modelling was deployed based on Newton’s laws of motion, principles of energy conservation and numerical integration. The model is based on a single rigid wheel because construction plant tyres are inflated to high pressure in order to support heavy loads thereby translating the flexible tyres into rigid mode. The results from the mathematical model were verified using a three stage robust verification process which included computational analysis based on two existing semi-empirical methods and real experimental data. Laboratory experiments using Mobility SF- 3713 were also used to check the validity of the results. The results from the mathematical model verify that a flexible tyre can operate in rigid mode if it encounters softer and wet ground. Results further indicate that the soil cohesion, angle of shearing resistance and moisture content play key roles in the subsequent power loss created by motion resistance. All the results from computational analysis and the experiments were found to be consistent with the mathematical model results. The study concludes that there is ample evidence to suggest that there is significant power loss associated with wheeled construction plant traversing in soft terrain which can be assessed. The study further concludes that a combination of economic decisions on variables must be considered with respect to existing ground conditions. This will considerably reduce uncertainty levels in cost and resource management on construction projects.