Energy Efficiency Classification of Agricultural Tractors in Korea
2012
Shin, C.S., Seoul National University, Seoul, Republic of Korea | Kim, K.U., Seoul National University, Seoul, Republic of Korea | Kim, K.W., Foundation of Agricultural Technology Commercialization and Transfer, Suwon, Republic of Korea
Purpose: This study was conducted to classify the energy efficiency of 131 tractor models tested during from 2006 to 2010 in Korea. Methods: Four sub-indexes were developed using the fuel consumptions at 60% and 90% of rated speed with partial loads and at pull speeds of 3.0 km/h and 7.5 km/h with maximum drawbar pull. Weighting factors of the sub-indexes were also considered to reflect the characteristics of tractor's actual working hours in Korea. Four sub-indexes were integrated into a classification index. Using the developed classification index, a five-classification system was made on the basis of normal distribution of tractors over the classification range. Percentage of 1∨st grade interval was expected to be close to 15%, 2∨nd grade 20%, 3∨rd grade 30%, 4∨th grade 20%, 5∨th grade 15%. Results: Number of 1∨st grade was 21, 2∨nd grade 23, 3∨rd grade 39, 4∨th grade 33, 5∨th grade 15 among 131 models. Conclusions: Classification index was developed by integrating four sub-indexes. By the classification method using developed index, distribution of classified tractors was acceptable for practical application.
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