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2026 Vol.6, Issue 3 Preview Page

Research Article

Equivalent load characteristics of the driving unit of a self-propelled garlic and onion collector based on field load measurements

실작업 조건 계측 기반 자주식 마늘·양파 수집기 주행부의 등가부하 특성 분석

Yi-Seo Min1
,
Seung-Gwi Kwon2
,
Sang-Hee Lee3
,
Seok-Pyo Moon3
,
Wan-Soo Kim456*
민 이서1
,
권 승귀2
,
이 상희3
,
문 석표3
,
김 완수456*
1Ph.D. Student, Department of Bio-Industrial Machinery Engineering, College of Agriculture and Life Sciences, Kyungpook National University, Daegu, 41566, Republic of Korea
2Director of Research Institute, Bulls Co. Ltd, Seongju, 40053, Republic of Korea
3Research Officer, Department of Agricultural Engineering, National Institute of Agricultural Science, Rural Development Administration, Jeonju, 54875, Republic of Korea
4Associate Professor, Department of Bio-Industrial Machinery Engineering, College of Agriculture and Life Sciences, Kyungpook National University, Daegu, 41566, Republic of Korea
5Associate Professor, Department of Smart Bio-Industrial Mechanical Engineering, College of Agriculture and Life Sciences, Kyungpook National University, Daegu, 41566, Republic of Korea
6Head of R&D Division, Upland Field Machinery Research Center, Kyungpook National University, Daegu, 41566, Republic of Korea
1경북대학교 농업생명과학대학 생물산업기계공학과 박사과정
2주식회사 불스 연구소장
3농촌진흥청 국립농업과학원 농업공학부 연구사
4경북대학교 농업생명과학대학 생물산업기계공학과 부교수
5경북대학교 농업생명과학대학 스마트생물산업기계공학과 부교수
6경북대학교 밭농업기계개발연구센터 연구개발실장
*Corresponding Author
30 September 2026. pp. 111-123
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Abstract

This study analyzed the equivalent load of the driving unit of a self-propelled garlic and onion collector to quantify the effect of load variability on fatigue design of the driveline. Field experiments were conducted under 18 operating conditions combining two crops (garlic and onion), three engine speeds (2000, 2300, and 2600 rpm), and three travel speeds (0.1, 0.2, and 0.3 m/s). Left and right sprocket torques were measured using strain gauge–based telemetry, and the 1× and 2× rotational harmonic errors caused by the single-sided gauge placement were removed in the frequency domain while preserving the actual work-load components. Equivalent torque and equivalent rotational speed were calculated based on Miner’s rule with eight load bins and a fatigue damage exponent of 3 (ISO 6336-6). The ratio of equivalent to mean torque exceeded unity under all conditions (1.015–1.123 for the left and 1.005–1.050 for the right sprocket) and remained stable across crops and operating conditions, whereas the mean torque itself varied more strongly with the operating condition. Although the equivalent torque exceeded the mean by at most 12.3%, mean-based design overestimated fatigue life by up to 29.4% owing to the cubic dependence of fatigue damage on load. These results indicate that the load variability of the driveline can be represented by a stable side-specific correction factor, while determining a single representative design load requires additional duty-cycle information on operating conditions.

Keywords
Equivalent load
Fatigue life
Load measurement
Self-propelled collector
Sprocket torque
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Information
  • Publisher :The Korean Society for Agricultural Machinery
  • Publisher(Ko) :한국농업기계학회
  • Journal Title :Journal of Agricultural Machinery Engineering
  • Journal Title(Ko) :농업기계공학
  • Volume : 6
  • No :3
  • Pages :111-123
  • Received Date : 2026-08-11
  • Revised Date : 2026-08-26
  • Accepted Date : 2026-08-27
  • DOI :https://doi.org/10.12972/jame.2026.6.3.4
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