Korean Journal of Agricultural Science (농업과학연구)

Institute of Agricultural Science, CNU (충남대학교 농업과학연구소)
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Development of an accelerated life test procedure considering the integrated equivalent load of an implement working pump for an agricultural tractor

  • Moon, Seok-Pyo (Department of Biosystems Machinery Engineering, Chungnam National University) ;
  • Baek, Seung-Min (Department of Smart Agriculture Systems, Chungnam National University) ;
  • Chung, Sun-Ok (Department of Biosystems Machinery Engineering, Chungnam National University) ;
  • Park, Young-Jun (Department of Biosystems & Biomaterials Science and Engineering, Seoul National University) ;
  • Han, Tae-Ho (Agricultural Machinery Certification Team, Foundation of Agriculture. Tech, Commercialization & Transfer) ;
  • Kim, Yong-Joo (Department of Biosystems Machinery Engineering, Chungnam National University)
  • Received : 2020.09.18
  • Accepted : 2020.11.30
  • Published : 2020.12.01
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Abstract

The goal of this study was to develop an accelerated life test for an implement working pump for an agricultural tractor. The field experiments were conducted to measure the load of an implement working pump during major agricultural operations such as plow tillage, rotary tillage, baler operations, and wrapping operations. The measurement system for an implement working pump load was constructed using a pressure sensor, the engine rotational speed, and the hitch pump displacement. The measured implement working pump load was calculated as an equivalent load for each agricultural operation using the Palmgren-Miner rule, which is a cumulative damage method. The equivalent load was calculated using the total load data and peak load data when the total data included the operation of an implement working. The annual usage time of the agricultural tractor was applied to develop two integrated equivalent loads. The acceleration factor was calculated to develop an accelerated life test and was calculated from the two integrated equivalent loads, the maximum pressure, and the flow rate conditions of the hitch pump. In Korea, the warranty life of a tractor is 2,736 hours, and the time required for the test to guarantee the operational life of tractors was calculated as 7,561 hours. The acceleration factors were calculated as 453.6 and 38.3, respectively, from the total load data and peak load data. The fatigue test time can be shortened by 16.7 and 197.4 hours according to the result of the acceleration factors.

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References

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