Korean Journal of Computational Design and Engineering (한국CDE학회논문집)

Society for Computational Design and Engineering (한국CDE학회)
권호 표지
DOI QR코드

DOI QR Code

Discomfort Assessment of Truck Ingress and Egress Motions Based on Simulated Muscle Contraction Forces

모사된 근육 수축력을 바탕으로 한 트럭 승하차 동작의 불편도 평가

  • 최남철 (국민대학교 자동차공학전문대학원) ;
  • 심지성 (국민대학교 자동차공학전문대학원) ;
  • 이상형 (국민대학교 자동차공학전문대학원) ;
  • 이기광 (국민대학교 체육학부) ;
  • 이상헌 (국민대학교 자동차공학과)
  • Received : 2011.02.28
  • Accepted : 2012.01.12
  • Published : 2012.02.01
Download PDF
⟨ Previous Next ⟩

Abstract

This paper proposes a novel discomfort assessment method for truck ingress and egress motions based on the maximum-voluntary-contraction (MVC) ratios of muscles obtained by biomechanical analysis of human musculoskeletal models. In this study, a human motion to enter and exit a truck cabin with different types and heights of footsteps is first measured using an optical motion capture system and load sensors. Next, in a biomechanical analysis system, a human musculoskeletal model with contacting conditions on footsteps and handles is modeled, and then joint torques and muscles forces are calculated by inverse dynamics of the musculoskeletal model with the motion data. Finally, the MVC ratios for the muscles are calculated and their statistical values are used as the measure of discomfort. To ensure the feasibility of our method, subjective discomfort levels have been investigated through the participants' experiments and questionnaires and compared to the results of our method. Comparing to the existing methods based on joint angles or torques, our approach provide a more essential criterion for discomfort because it is based on the muscle contraction by which an active human motion is basically generated.

Keywords

References

  1. Lin, L.-J. and Cohen, H. H., "Accidents in the trucking industry," Journal of Industrial Ergonomics, Vol. 20, No.4, pp.287-300, 1997. https://doi.org/10.1016/S0169-8141(96)00060-1
  2. Namamoto, K., Atsumi, B., Kodera, H., and Kanamori, H., "Quantitative analysis of muscle stress during ingress/egress of the vehicle," JSAE Review, Vol. 24, No. 3, pp.335-339, 2003. https://doi.org/10.1016/S0389-4304(03)00038-9
  3. Dufour , F. and Wang, X., "Discomfort assessment of car ingress /egress motions using the concept of neutral movement," SAE International Conference and Exposition of Digital Human Model for Design and Engineering, Iowa City, June 15-17, 2005, SAE paper 2005-01-2706, 2005.
  4. 최남철, 심지성, 김재호, 이상묵, 이상헌, "승용차 승하차 동작의 정량적인 불편도 평가 방법," 한국 CAD/CAM학회 논문집, Vol. 15, No. 5, pp. 333- 342, 2010.
  5. Kee, D. and Karwowski, W., "Ranking systems for evaluation of joint and joint motion stressfulness based on perceived discomforts," Applied Ergonomics, Vol. 34, No. 2, pp. 167-176, 2003. https://doi.org/10.1016/S0003-6870(02)00141-2
  6. 김재호, "생체역학적 해석을 이용한 승용차 승하차 동작의 불편도 평가 방법의 연구," 석사 학위 논문, 국민대학교 자동차공학 전문대학원, 2008.
  7. Zacher, I. and Bubb, H., "Strength based discomfort model of posture and movement," Digital Human Modeling for Design and Engineering Symposium, Oakland University, Rochester, Michigan, USA, June 15-17, 2004, SAE Paper 2004-01-2139, 2004.
  8. Anderson, D. E, Madigan M. L., and Nassbaum M. A., "Maximum voluntary joint torque as a function of joint angle and angular velocity: Model development and application to the lower limb," Journal of Biomechanics, Vol. 3, pp.3105-3113, 2007.
  9. 장수혁, 박범, 박영기, 김영호, "지게차 승하차 안락성 측정을 위한 평가지수 모델 개발," 2007 대한인간공학회 추계학술대회 논문집, pp. 336-341, 2007.
  10. 김용표, "트럭의 발판 설치 구조", 특허실용, 출원번호 1019960060969
  11. Vicon, http://www.vicon.com
  12. LifeMOD, http://www.lifemodeler.com
  13. 기도형, "작업장 설계와 평가를 위한 한국인 관절의 안락 동작범위 측정," 대한인간공학회지, Vol. 16, No. 2, pp. 73-82, 1997.