Transactions of the Korean Society of Mechanical Engineers A (대한기계학회논문집A)

The Korean Society of Mechanical Engineers (대한기계학회)
권호 표지
DOI QR코드

DOI QR Code

Stress Analysis and Shape Optimization of Dynamic Locking Tongue (DLT) Using FEM

FEM을 이용한 Dynamic Locking Tongue(DLT)의 강도 해석 및 형상 최적화

  • Received : 2011.08.23
  • Accepted : 2012.04.10
  • Published : 2012.06.01
Download PDF
⟨ Previous Next ⟩

Abstract

The role of a seat belt in a vehicle is to protect the driver from injury when a crash occurs. However when a large crash occurs, the driver slips forward and receives a strong impact. To prevent this situation, improvement of seat belts is essential. In this study, the new concept of a dynamic locking tongue (DLT) for seat belts is developed. The DLT device is used to reduce the impact to the driver's chest by tightening the webbing, so the driver is protected from severe injury in a large crash. First, a finite element model of the DLT device is created using SAMCEF and structural analysis is conducted with boundary conditions similar to those found in experiments. Then, the stress in the DLT device can be calculated. Second, the shape of the DLT device is optimized using the response surface analysis method in order to minimize the stress and weight. The validity of the optimization of the DLT device is verified using structural analysis.

안전벨트의 역할은 차량 충돌이 발생했을 때 운전자를 보호하는 것이다. 그러나 강한 충돌이 발생하게 되면 운전자가 안전벨트에서 미끄러지게 되어 강한 충격을 받는다. 그러므로 이러한 현상을 방지하기 위해 새로운 안전벨트의 개발이 필요하다. 이 연구에서는 새로운 개념의 안전벨트인 Dynamic Locking Tongue(DLT)을 개발하였다. DLT장치는 강한 충돌이 발생했을 때 벨트(Webbing)가 안전벨트에서 미끄러지지 않게 하여 운전자의 피해를 줄여주는 장치이다. DLT장치 개발은 동역학 해석 프로그램인 SAMCEF를 이용하였다. 우선 DLT장치의 유한요소모델을 생성하였다. 그리고 실제 시험방법과 유사한 환경을 만들어 테스트를 해보았다. 이를 통해 DLT장치의 무게와 응력를 구할 수 있다. DLT장치의 최소 강도와 무게를 구하기 위해 반응 표면 분석법을 이용하여 DLT장치의 형상을 최적화하였다. 최적화된 DLT장치를 구조 해석을 통해 신뢰성을 검증하였다.

Keywords

References

  1. Chio, J. Y. and Lee, H. G., 2001, "Overload Analysis and Je Based Fatigue Life Prediction of Spot-Welded Auto Seat Belt Anchors," Transactions of Korean Society of Mechanical Engineer A, Vol. 25, No. 4, pp. 662-670.
  2. Jung, S. P. and Park, T. W., 2010, "Developm ent of Operating Mechanism of a Pretensioner using Internal Gear Pairs," Journal of the Korean Society for Precision Engineering, Vol. 27, No. 3, pp. 89-94.
  3. Bready, J., James, M., Smith, G., Tolman, S. and Gordon, J. J., 2005, "Issues in Seat Belt Inertial Release," SAE World Congress Detroit, No. 2005.01.1706.
  4. Yun, D. K., 2008, "The Endurable Inertia when a Car Suddenly Stops," Korea Transportation Safety Authority, Vol. 10, pp. 50-51.
  5. Jung, S. P., Park. T. W. and Kim. Y. G., 2010, "Thermal Deformation Analysis and Shape Optimization of a Ventilated Disc using FEM," Journal of the Korean Society for Precision Engineering, Vol. 26, No. 1, pp. 1-2.
  6. Jung, S. P., Park. T. W., Jun. K. J., Yoon. J. W., Lee. S. H. and Chung. W. S., 2009, "A Study on the Optimization Method for a Multi-Body System Using the Response Surface Analysis," Journal of Mechanical Science and Technology, Vol. 23, No. 4, pp. 950-953. https://doi.org/10.1007/s12206-009-0319-2
  7. Vanderplaats, G. N., 1984, "Numerical Optimization Techniques for Engineering Design," McGraw-Hill, New-York, pp. 195-201.
  8. Jung, S. P., Park. T. W. and Kim. Y. G., 2010, "Fatigue Strength Optimization of Friction Stir Welded A6005-T5 Alloy Sheets," Science and Technology of Welding and Joining, 2010, Vol. 15, No. 6, pp. 473-478. https://doi.org/10.1179/136217110X12785889549705

Cited by

  1. Design Optimization of the Support Frame of an Antenna Positioner Mounted on a Vehicle vol.31, pp.5, 2014, https://doi.org/10.7736/KSPE.2014.31.5.411