Journal of Drive and Control (드라이브 ㆍ 컨트롤)

The Korean Society for Fluid Power and Construction Equipment (유공압건설기계학회)
권호 표지
DOI QR코드

DOI QR Code

Measurement Uncertainty calculation for improving test reliability of Agricultural tractor ROPS Test

농업용트랙터 ROPS 시험의 신뢰성 향상을 위한 측정불확도 추정

  • Ryu Gap Lim (Department of Smart Agriculture, Korea Agriculture Technology Promotion Agency) ;
  • Young Sun Kang (Korea Agriculture Mechanization Policy Institute) ;
  • Taek Jin Kim (Department of Drive System Team, TYM R&D Center)
  • Received : 2023.02.15
  • Accepted : 2023.02.20
  • Published : 2023.03.01
Download PDF
⟨ Previous Next ⟩

Abstract

The agricultural tractor ROPS test method according to OECD code 4 is a test to assess whether the driver's safety area can be secured when a tractor overturns, and reliability should be ensured. In this study, a model formula and procedure for calculating measurement uncertainty expressing reliability in the field of agricultural machinery testing were established according to the ISO/IEC Guide 98-3:2008. The characteristics of the ROPS test device were assessed and repeated tests were performed, and the were used as factors to calculate the measurement uncertainty. As a result of repeated tests, the accuracy was higher than 1.9 % in all load directions; thus, they were, applied to calculate the type A standard uncertainty. The final expanded uncertainty was calculated within the range of less than ± 7.76 kN of force and ± 6.96 mm of deformation in all load directions.

Keywords

Acknowledgement

본 결과물은 농림축산식품부의 재원으로 첨단농기 계산업화기술개발사업(121030-02)과 농림식품기술기획평가원의 기술사업화지원사업(821053-3)의 지원을 받아 연구되었음.

References

  1. D. Y. Um, "Consideration of the measurement uncertainty for reliability improvement of surveying results," Korea Society of Surveying, Geodesy, Photogrammetry, and Cartography, pp.107~112, 2011.
  2. ISO. 2011. Uncertainty of measurement - Part 3: Guide to the expression of uncertainty in measurement (GUM:1995) - Supplement 2: Extension to any number of output quantities. In ISO/IEC GUIDE 98-3:2008/SUPPL 2:2011.
  3. APLAC. 2006. "Interpretation and guidance on the estimation of uncertainty of measurement in Testing", In APLAC TC 005.
  4. S. J. Moon and J. H. Chung, "Measurement uncertainty of vibration testing result with including uncertainty of testing facilities", Transactions of the Korean Society for Noise and Vibration Engineering, Vol.26, No.7, pp.781~786, 2007. https://doi.org/10.5050/KSNVE.2016.26.7.781
  5. B. J. Cho et al., "Improved Design of Hydraulic Circuit of Front-end Loader for Bump Shock Reduction of an Agricultural Tractor", Journal of Drive and Control, Vol.13, No.2, pp.10-18, 2016. https://doi.org/10.7839/KSFC.2016.13.2.010
  6. N. G. Lee et al., Analysis of Traction Performance for Agricultural Tractor According to Soil Condition", Journal of Drive and Control, Vol.17, No.4, pp.133-140, 2020. https://doi.org/10.7839/KSFC.2020.17.4.133
  7. S. M. Baek et al, "Analysis of Engine Load Factor for a 78 kW Class Agricultural Tractor According to Agricultural Operations" Journal of Drive and Control, Vol.19, No.1, pp.16-25, 2022.
  8. J. H. Won et al., "Study on Traveling Characteristics of Straight Automatic Steering Devices for Drivable Agricultural Machinery" Journal of Drive and Control, Vol.19, No.4, pp.19-28, 2022.
  9. S. W. Park, Y. H. Choi and C. H. Lee, "Review of Regulation for Rollover Test and Evaluation of Safety for Buses by using Simulation of Multi-body Dynamics", Journal of Drive and Control, Vol.19, No.3, pp.39-46, 2022. https://doi.org/10.7839/KSFC.2022.19.3.039
  10. J .K. Lee et al., "Uncertainty analysis and ANOVA for the confidence estimation of altitude engine test." Journal of Mechanical Science and Technology, Vol.21, No.4, pp.664-671, 2006. https://doi.org/10.1007/BF03026971
  11. S. H. Park, K. H. Lee and H. S. Han, "Estimation of uncertainty in vibration measurement of shipboard equipment", Transactions of the Korean Society for Noise and Vibration Engineering, Vol.24, No.7, pp.509-516, 2014. https://doi.org/10.5050/KSNVE.2014.24.7.509
  12. S. H. Jeong et al., "Standard Uncertainty Evaluation for Dynamic Material Properties of Auto-body Steel Sheets," The Korean Society of Automotive Engineers, pp.2784-2793, 2010.
  13. Y. H. Huh, H. M. Lee, D. J. Kim and J. S. Park, "Estimation of Measurement Uncertainty in Evaluation of Tensile Properties." The Korean Society of Mechanical Engineers-A 34(1), 2010.1, pp.73-78. https://doi.org/10.3795/KSME-A.2010.34.1.73
  14. K. R. Kim and Y. S. Lee, "Study on the Estimation of Measurement Uncertainty in MOI Measurement." Journal of the Korea Institute of Military Science and Technology, Vol.16, No.6, pp.797-802, 2013. https://doi.org/10.9766/KIMST.2013.16.6.797
  15. W. S. Cheung, Y. T. Kim and D. P. Hong, "Study on uncertainty factors of head vibration measurements," Proceedings of the Korean Society for Noise and Vibration Engineering, Vol.15, No.94, pp.20-28, 2005. https://doi.org/10.5050/KSNVN.2005.15.1.020
  16. G. G. Song, C. S. Lee and Y. H. Kim, "Effects of environmental conditions on uncertainty of reverberation time," Proceedings of the KSNVE Annual Spring Conference, pp.439-440, 2014.
  17. OECD code 4. 2021. "OECD standard code for the official testing of protective structures on agriculture and forestry tractors", OECD Headquarters, Paris, France
  18. R. G. Lim et al., "Agricultural tractor roll over protective structure (ROPS) test using simplified ROPS model", Korean Journal of Agricultural Science, 49(4) 2022, pp.771-783.
  19. B. L. Welch, "The generalization of 'STUDENT'S' problem when several different population varlances are involved," Biometrika, Vol.34 No.1/2, pp.28-35, 1947. https://doi.org/10.1093/biomet/34.1-2.28