Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
Results
Showing 1 to 20 of 142 for “"tractor"”.
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Factors affecting tractor purchases and expenditures
Thesis (M.S.)--Michigan State University. Dept. of Agricultural Economics, 1966
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Navigation Control for Autonomous Tractor Guidance
… simulation and field tests on an agricultural tractor platform equipped with RTK-GPS and FOG posture sensors. The field tests showed that the root mean squared (RMS) offset error was less than 0.05 m and the maximum offset error was less than 0.1 m for a straight path at speeds of up to 3 m/s . …
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Autonomous Tractor-Trailer Stopping and Jackknifing Dynamics
… for passenger cars, developing an autonomous for tractor-trailers is the next step for driverless roads. Tractor-trailers are heavy, large, and have a pivot joint between the tractor and trailer that makes the movement between the two more complicated. The purpose of the research presented here is …
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Alternative Forecasting Models for Farm Wheel Tractor Horsepower Purchases
Previous research efforts on tractor demand have concentrated mainly on hypothesis testing and providing explanations for underlying intrinsic relationships among variables. Very little attention has been devoted to forecasting tractor demand.
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The United States Tractor Industry in Selected Foreign Markets
Made available in DSpace on 2014-12-09T17:52:42Z (GMT). No. of bitstreams: 1 6503627.pdf: 10811465 bytes, checksum: 05e2cfb1814bf230b29a2971331ba6ef (MD5) Previous issue date: 1964
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Design and development of a tractor-mounted, recording penetrometer
… objectives: (i) to design and develop a tractor-mounted, hydraulically-operated, recording penetrometer, (ii) to collect the initial penetration resistance data from the experimental plots established for the long term study. A penetrometer assembly was designed and constructed with the …
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Vision Sensing for Automated Tractor Guidance: A Pose Determination Approach
PGA performance for estimating heading angle was considered satisfactory. However, for offset estimation, PGA still requires some improvement.
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Finite element analysis of pre-ROPS tractor axle housing strength
Tractor rollover protective structures (ROPS) have been found effective for protecting people from serious injury or death when tractors overturn. Extension agricultural engineers and safety specialists are promoting the retrofitting of ROPS on pre-ROPS tractors. ROPS, meeting to ASAE standards, …
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High-Speed Roll Stability Evaluation of A-Double Tractor-Trailers
… on high-speed roll stability of A-double tractor trailers with 28-ft and 33-ft straight-rail and drop-frame trailers is evaluated through simulation and track testing. The changes in CG position due to the type of trailer (straight-rail vs. drop-frame) and laterally and longitudinally …
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An analysis of stress variation in tractor axles by simulation methods
Digitized by Kansas Correctional Industries
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Active Minimization of Acoustic Energy Density in a Mock Tractor Cab
… which, for experiments involving recorded tractor engine noise, was derived from the engine's tachometer signal. For the low frequencies at which engine firing occurs, experiments showed that ANC systems minimizing ED and SP both provided significant attenuation of the tonal noise near the …
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Design and analysis of an active underbody aerodynamic device for tractor trailers
… aerodynamic drag. The underbody region of a tractor-trailer is responsible for up to 30 % of the aerodynamic drag on tractor-trailers, which is the highest drag created by any region on the vehicle. In this study, a novel concept of an active underbody drag reduction device is developed and …
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Employee integration and automation : a study at Caterpillar Tractor Company, Peoria, Illinois
Thesis (B.S.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 1981.
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Automation and internal labor market structure : a study of the Caterpillar Tractor Company
Thesis: M.S., Massachusetts Institute of Technology, Department of Mechanical Engineering, 1981
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The application of statistical quality control to the casting of tractor transmission cases
This thesis is written with the intention to help establish the fact that there are definite advantages to be claimed from the use of statistical quality control in the foundry industry.
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Design of a mechanical system for tillage tool depth control on small farm tractor
Tractor implements increase the risk of injury by destabilizing the tractor, and therefore they must be designed with caution and mechanical integrity. Tillage tool attachment systems must be designed to determine a tool's maximum depth into the soil and withstand the resulting forces from the …
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The mechanics of tractor performance and their impact on historical and future device designs
This thesis utilizes a terramechanics-based farm tractor model to predict machine performance. This model is used to reflect on tractor evolution throughout the last century and the physics-based principles that govern tractor performance. Insights from this model and reflection can help designers …
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