여름감자 기계수확 시 작업기에 따른 트랙터 소요동력 및 PTO 축 피로특성 분석

초록

Summer potato cultivation is primarily conducted in highland regions with high stone content, which causes irregular loads on the tractor PTO shaft during harvesting operations. Since different implements are applied depending on farm conditions during potato harvesting operations, it is necessary to analyze the load characteristics of the PTO shaft for each implement. This study analyzed the consumed power and PTO shaft load characteristics according to changes in operating conditions and harvester types during potato harvesting in an experimental field in Pyeongchang, Gangwon-do. Field tests were conducted using a 42 kW tractor equipped with three types of potato harvesters with different specifications, under three levels of driving gear and two levels of PTO gear. Torque and rotational speed of the engine output shaft, axle, and PTO shaft were measured using a measurement system to calculate the consumed power. The Rain-flow counting method, the Goodman equation, and the Palmgren–Miner rule were applied to derive the fatigue life of the PTO shaft. The results showed that the consumed power of the engine and PTO shaft ranged from 5.50 to 9.68 kW and from 1.18 to 4.65 kW, respectively. Under the same driving condition, the fatigue life of the PTO shaft tended to decrease as the PTO gear increased. Furthermore, when annual operating time was considered, the minimum fatigue life of the PTO shaft was estimated to be 30,000 years, indicating that the PTO shaft was safe against fatigue failure under all operating conditions and implement types.

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