Analyzing Safety Factors and Predicting Fatigue Life of Weak Points in an Electrically Driven, Multi-Purpose Cultivation Tractor

In-Seok Hwang, Jeong-Hun Kim, Wan-Tae Im, Hwan-Hong Jeung, Ju-Seok Nam () and Chang-Seop Shin ()
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In-Seok Hwang: Department of Biosystems Engineering, Chungbuk National University, Cheongju 28644, Republic of Korea
Jeong-Hun Kim: Department of Biosystems Engineering, Kangwon National University, Chuncheon 24341, Republic of Korea
Wan-Tae Im: Department of Biosystems Engineering, Chungbuk National University, Cheongju 28644, Republic of Korea
Hwan-Hong Jeung: Cheung Won SFA Co., Ltd., Seoul 08389, Republic of Korea
Ju-Seok Nam: Department of Biosystems Engineering, Kangwon National University, Chuncheon 24341, Republic of Korea
Chang-Seop Shin: Department of Biosystems Engineering, Chungbuk National University, Cheongju 28644, Republic of Korea

Agriculture, 2024, vol. 14, issue 3, 1-17

Abstract: The advancement of agriculture and a shortage of labor have led to an increased use of agricultural machinery. However, the resulting environmental issues have prompted a shift from internal combustion engines to electric drivetrains. The electric drivetrain includes the installation of batteries, which can lead to decreased energy efficiency and significant loads on the vehicle due to their heavy weight. Consequently, the importance of ensuring the safety of agricultural machinery is being increasingly emphasized. The load on the frame of agricultural machinery is not consistent during off-road driving, and the accumulation of load cycles can lead to the destruction and failure of components. Therefore, it is necessary to ensure a level of safety and to predict the fatigue life. In this study, we estimate the safety factor and predict the fatigue life of weak points in an electrically driven, multi-purpose cultivation tractor based on working conditions (width, soil, and drive). Strain gauges were attached to these weak points to measure the strain, which was then converted to von Mises stress. Fatigue life was predicted using the rainflow counting method and the Palmgren–Miner rule. The results showed that the safety factor measured under various working conditions was greater than 1. The estimated minimum fatigue life was 124,176 years. Considering that the cultivator is used for 29.7 h annually and has a durability lifespan of 5 years, it is expected to be safely usable throughout its service life.

Keywords: electrically driven; multi-purpose cultivation tractor; fatigue life; rainflow counting; safety factor (search for similar items in EconPapers)
JEL-codes: Q1 Q10 Q11 Q12 Q13 Q14 Q15 Q16 Q17 Q18 (search for similar items in EconPapers)
Date: 2024
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