Determinação do rendimento na barra de tração de tratores agrícolas com tração dianteira auxiliar (4X2 TDA)

• Autor(a) principal: Masiero, Fabrício Campos [UNESP]
• Data de Publicação: 2011
• Outros Autores: Lanças, Kléber Pereira [UNESP], Monteiro, Leonardo de Almeida
• Tipo de documento: Artigo
• Idioma: por
• Título da fonte: Repositório Institucional da UNESP
• Texto Completo: http://dx.doi.org/10.17224/EnergAgric.2011v26n4p55-73; http://hdl.handle.net/11449/137431
• topic: Tractor test; Surface condition; Tractor slippage; Ensaio de máquinas; Superfície trativa; Patinagem

This research was accomplished with the objective to determine the dynamic drawbar performance of several agricultural 4WD tractors in different surface condition (concrete, firm soil, tilled soil, and soil covered with vegetation) comparing them with the theoretical and practical bibliography values (Wendel Bowers "0.86 Factor" and D497.4 ASAE standard, 1999). Eleven agricultural tractors were tested at all different tracks of NEMPA – agricultural and forest tractors and tires test nucleus, College of Agronomic Science, UNESP, Botucatu/SP, Brazil, being varied the tire constructive type and models, tire inflation pressures, relationship between the tractor weight and engine power and theoretical. The maximum tractor drawbar performance obtained in the tests was arranged in groups, being obtained the medium dynamic drawbar performance and standard deviation for each surface condition. For the accomplishment of the experiment the UMEB – Mobile Unit for Drawbar Test, belonging to the NEMPA, as a dynamometric car, equipped with an acquisition and storage data system. In concrete track the results showed that the medium value obtained for maximum drawbar performance (63.2%) was less than proposed by Wendel Bowers (79.2%) and for ASAE value (72.2%). At firm soil track, the obtained value (56.5%) confirmed the values of the bibliography. In mobilized soil tracks the obtained value (44%) confirmed the value proposed by Wendel Bowers' (42.8%) and it was less than the correspondent value for ASAE (53.9%). In vegetable covering soil surface the medium value obtained of maximum drawbar performance was 49.7%, and there are not bibliography data for this surface.