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Full-Text Articles in Life Sciences

Evaluation Of Controller Area Network Data Collection System In Confined Animal Feeding Operations, Matthew J. Darr, Lingying Zhao, M. R. Ehsani, J. K. Ward, T. S. Stombaugh May 2005

Evaluation Of Controller Area Network Data Collection System In Confined Animal Feeding Operations, Matthew J. Darr, Lingying Zhao, M. R. Ehsani, J. K. Ward, T. S. Stombaugh

Matthew J. Darr

Livestock and poultry industries play an important role in the food supply and economy of US agriculturalists. Current and historical trends show that the number of animals housed in individual facilities continues to grow on a yearly basis. While design improvements have enabled structures to physically house the growing number of livestock, a new problem exists in maintaining a safe indoor environment due to the increases in animal waste production. The Environmental Protection Agency is also beginning to enforce regulations to limit the daily emission rate of specific gases and odors associated with animal production. Research is needed to identify ...


Rate Response Assessment From Various Granular Vrt Applicators, John P. Fulton, Scott A. Sherer, Stephen F. Higgins, Matthew J. Darr, Timothy S. Stombaugh Jan 2005

Rate Response Assessment From Various Granular Vrt Applicators, John P. Fulton, Scott A. Sherer, Stephen F. Higgins, Matthew J. Darr, Timothy S. Stombaugh

Matthew J. Darr

Variable-rate technology (VRT) adds complexity to application equipment, thereby confounding the assessment of applicator performance. The intent of this investigation was to assess the rate response of various VRT granular applicators: two spinner spreaders (A and B), and two pneumatic applicators (C and D). Variable-rate (VR) tests were conducted to quantify the rate response characteristics (delay and transition times) for the applicators. A sigmoidal function was used to model the rate response for five of the six tests. Applicator A exhibited a linear response during decreasing rate changes. Results indicated that only applicator B demonstrated consistent delay and transition times ...


Controller Area Network Based Distributed Control For Autonomous Vehicles, Matthew J. Darr, Timotthy S. Stombaugh, Scott A. Shearer Jan 2005

Controller Area Network Based Distributed Control For Autonomous Vehicles, Matthew J. Darr, Timotthy S. Stombaugh, Scott A. Shearer

Matthew J. Darr

The goal of this project was to evaluate the potential of a controller area network (CAN bus) to be used as the communication network for a distributed control system on an autonomous agricultural vehicle. The prototype system utilized microcontroller-driven nodes to act as control points along a CAN bus. Messages were transferred to the steering, transmission, and hitch control nodes via a task computer. The task computer utilized global positioning system data to generate appropriate control commands. Laboratory and field testing demonstrated that each of the control nodes could function simultaneously over the CAN bus. Results showed that the task ...