Journal of Biosystems Engineering

Korean Society for Agricultural Machinery (한국농업기계학회)
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Case Study of Accelerated Life Test Method for Agricultural Tractor Transmission

농업용 트랙터 변속기의 가속 수명 시험법의 사례연구

  • Published : 2009.10.25
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Abstract

This study was performed to develop accelerated life test methods for agricultural tractor transmission receiving variable load. To acquire parameters for calculation of accelerated life test, endurance tests were performed under different torque conditions. Test results showed that the shape factor of Weibull distribution was 1.5 and fatigue damage exponent was 5.4. The calculated test time was 5,877 hours under the conditions of average life (MTBF) 3,000 hours and 90% reliability for one test sample. According to the linear cumulative damage rule, test time could be reduced using increased test load. Test time could be reduced by 252 hours when 1.2 times of the rated load compared with 0.67 times of the rated equivalent load calculated by load spectrum of the agricultural tractor. Calculated acceleration coefficient was 23.3.

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References

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