Journal of the Korean Society for Aeronautical & Space Sciences (한국항공우주학회지)

The Korean Society for Aeronautical and Space Sciences (한국항공우주학회)
권호 표지
DOI QR코드

DOI QR Code

Bolt Loosening Analysis under Transverse Vibration for Design of Reliable Pyrotechnic Separation Nut

신뢰성 있는 파이로테크닉 분리 너트 설계를 위한 진동 시 볼트 풀림 해석

  • Received : 2018.09.13
  • Accepted : 2018.10.26
  • Published : 2018.12.01
Download PDF
⟨ Previous Next ⟩

Abstract

Recently, pyrotechnic separation nut has attracted a considerable attention because of its shock reduction effect among various pyrotechnic mechanical devices. However, its bolt loosening behavior under transverse vibration has not been studied sufficiently, since segmented nuts are utilized instead of conventional nut in pyrotechnic separation nut. With the background, bolt loosening analyses are carried out referring to Junker vibration test. The analysis procedure consists of two steps. The first step is the bolt fastening step, screwing the bolt by fastening torque. The second step is the bolt loosening step under transverse vibration. Through the procedure, bolt loosening behaviors are obtained, and the effect of clearance on loosening behavior is closely investigated for reliable design of pyrotechnic separation nut.

최근 우수한 충격 저감 효과로 인해 파이로테크닉 분리 장치의 한 종류인 저충격 파이로 테크닉 분리 너트에 많은 관심이 주어지고 있다. 하지만 파이로테크닉 분리 너트의 경우 일반 너트 대신 분할 너트가 사용되기 때문에 볼트 풀림 거동에 대한 연구가 충분히 이루어지지 않은 측면이 있다. 이에 본 연구에서는 Junker 진동시험을 준거삼아 볼트 풀림 해석을 수행하였다. 해석은 크게 두 단계로 이루어져 있다. 첫 번째 단계는 체결토크를 이용하여 볼트를 분리너트에 체결하는 과정이고, 두 번째 단계는 횡 방향 가진을 통해 볼트가 풀리는 과정이다. 이러한 과정을 통해 볼트 풀림 거동을 얻을 수 있었다. 또한 신뢰성 있는 파이로테크닉 분리 너트의 설계를 위해 체결부 틈새가 볼트 풀림 거동에 미치는 영향을 고찰하였다.

Keywords

References

  1. Kim, D. J., Lee, Y. J., and Kim, N. C., "The Type and Properties of the Separation Devices Using Pyrotechnics," Proceeding of The 2016 Korean Society for Aeronautical and Space Sciences Spring Conference, 2016, pp.209-213.
  2. Kim, Z. I., Kim, D. J., Jung, D. H., and Kim, N. C., "Study on Technics of Decreasing Separation Pyro-shock of PMD," Proceeding of The 2015 Korean Society of Propulsion Engineers Fall Conference, 2015, pp.543-546.
  3. Woo, J. M., Jang, J. S., Cho, J. Y., Kim, J. H., Roh, T. S., and Yang, H. W., "Design Concept of Pyrotechnic Separation Nut," Proceeding of The 2015 Korean Society of Propulsion Engineers Spring Conference, 2015, pp.377-381.
  4. Woo, J. M., Cha, S. W., Cho, J. Y., Kim, J. H., Roh, T. S., Jang, S. G., Lee, H. N., and Yang, H. W., "Prediction of Pyroshock-Reduced Separation Nut Behaviors," Journal of Propulsion and Power, Vol. 34, No. 5, 2018, pp.1240-1255. https://doi.org/10.2514/1.B36906
  5. Bickford, J. H., Introduction to the Design and Behavior of Bolted Joints: Non-Gasketed Joints, 4th ed., CRC Press, New York, 2008.
  6. ISO 286, Geometrical Product Specifications (GPS) - ISO Code System for Tolerances on Linear Sizes, 2010.
  7. Junker, G. H., "New Criteria for Self-Loosening of Fasteners Under Vibration," SAE Transactions, 1969, pp.314-335.
  8. Liu, J., Ouyang, H., Feng, Z., Cai, Z., Liu, X., and Zhu, M., "Study on Self-Loosening of Bolted Joints Excited by Dynamic Axial Load," Tribology International, Vol. 115, 2017, pp.432-451. https://doi.org/10.1016/j.triboint.2017.05.037
  9. Pai, N. G. and Hess, D. P., "Three-Dimensional Finite Element Analysis of Threaded Fastener Loosening Due to Dynamic Shear Load," Engineering Failure Analysis, vol. 9, No. 4, 2002, pp.383-402. https://doi.org/10.1016/S1350-6307(01)00024-3
  10. Woo, J. M., Kang, D. H., Choi, J. Y., Kim, J. H., Cho, J. Y., Jang, S. G., and Yang, H. W., "Effect of Clearance on Clamping Characteristics of Segmented Nuts in Pyrotechnic Separation Nut," Journal of The Korean Society for Aeronautical and Space Sciences, Vol. 46, No. 11, 2018, pp.994-1003. https://doi.org/10.5139/JKSAS.2018.46.12.994
  11. Kang, D. H., "A Study on the Nut Factor of Segmented Nuts in the Pyro Separation Nut," Master's Thesis, Inha University, Incheon, Republic of Korea, pp.26-27.
  12. ISO 16130, Aerospace series - Dynamic Testing of the Locking Behaviour of Bolted Connections under Transverse Loading Conditions (vibration test), 2015.
  13. VID 2230, Systematic calculation of high duty bolted joints - Joints with one cylindrical bolt, 2003.
  14. Urone, P. P., Physics with health science applications, John Wiley & Sons, 1985.
  15. Lee, W. H., Huh, Y., Cho, S. K., Koo, J. M., and Seok, C. S., "A Study on the Development of Loose Prevention Bolt and Nut," Proceeding of The 2007 Korean Society for Precision Engineering Spring Conference, 2007, pp.529-530.