Journal of the Korea Academia-Industrial cooperation Society (한국산학기술학회논문지)

The Korea Academia-Industrial cooperation Society (한국산학기술학회)
권호 표지
DOI QR코드

DOI QR Code

Study for Characteristic of Frictional Heat Transfer in Rotating Brake System

회전을 고려한 브레이크 디스크의 마찰열전달 연구

  • Nam, Jiwoo (School of Mechanical Engineering, Chung-Ang University) ;
  • Ryou, Hong Sun (School of Mechanical Engineering, Chung-Ang University) ;
  • Cho, Seong Wook (School of Mechanical Engineering, Chung-Ang University)
  • Received : 2017.07.18
  • Accepted : 2017.10.13
  • Published : 2017.10.31
Download PDF
⟨ Previous Next ⟩

Abstract

The braking system is one of the most important components in vehicles and machines. It must exert a reliable braking force when they are brought to a halt. Generally, frictional heat is generated by converting kinetic energy into heat energy through friction. As the kinetic energy is converted into heat energy, high temperature heat is generated which affects the mechanical behavior of the braking system. Frictional heat affects the thermal expansion and friction coefficient of the brake system. If the temperature is not controlled, the brake performance will be decreased. Therefore, it is important to predict and control the heat generation of the brake. Various numerical analysis studies have been carried out to predict the frictional heat, but they assumed the existence of boundary conditions in the numerical analysis to simulate the frictional heat, because the simulation of frictional heat is difficult and time consuming. The results were based on the assumption that the frictional heat is different from the actual temperature distribution in a rotating brake system. Therefore, the reliability of the cooling effect or thermal stress using the results of these studies is insufficient. In order to overcome these limitations and establish a simulation procedure to predict the frictional heat, this study directly simulates the frictional heat generation by using a thermal-structure coupling element. In this study, we analyzed the thermo-mechanical behavior of a brake model, in order to investigate the thermal characteristics of brake systems by using the Finite Element method (FEM). This study suggests the necessity to directly simulate the frictional heating and it is hoped that it can provide the necessary information for simulations.

제동 장치는 기계장치의 사용자나 시스템의 안전관점에서 가장 중요한 요소 중 하나이며, 작동 조건 내에서 신뢰성 있는 제동력이 유지 되어야 한다. 일반적으로 브레이크는 운동에너지를 마찰을 통해 열에너지로 변환하여 회전하는 기계장치를 제동한다. 운동에너지가 열에너지로 전환되는 과정에서 고온의 열이 발생하여 기계적 거동에 영향을 준다. 마찰열은 브레이크 시스템의 열팽창 및 마찰계수 변화 등에 영향을 주고 제어되지 않는 고온은 브레이크 성능을 저하시킨다. 따라서 브레이크의 발열을 예측하고 이를 제어하는 것은 중요하다. 마찰열을 예측하기 위한 다양한 수치해석 연구들이 수행되었지만, 계산의 효율 및 재원의 한계로 수치해석의 경계조건을 다양한 형태로 가정하여 마찰열 예측 연구를 수행하였다. 가정된 마찰열 거동은 실제 열전달 온도 분포 경황과 차이가 있고 이를 이용한 냉각 효과나 열응력 수치해석 결과의 신뢰성이 부족하다. 이러한 한계점을 극복하고 마찰열 예측 시뮬레이션 절차를 정립하기 위하여 본 연구에서는 열-구조 결합 요소를 사용하여 브레이크 시스템의 마찰열 발생을 직접적으로 모사하는 시뮬레이션을 수행하였다. 본 논문은 Finite Element Method(FEM)을 이용하여 브레이크 작동에 따른 마찰열 발생을 모사하고 열분포 특성을 분석하기 위해 브레이크 모델을 대상으로 열-구조 연성요소를 적용한 수치해석 연구를 수행하였다. 이 연구는 마찰열 직접 모사의 필요성을 제안하고 시뮬레이션에 필요한 정보를 제공할 수 있다 판단된다.

Keywords

References

  1. Z. Olesiak, Y. Pyryev, A. Yevtushenko, "Determination of temperature and wear during braking", Wear, vol. 210, no. 1, pp. 120-126, 1997. DOI: https://doi.org/10.1016/S0043-1648(97)00086-0
  2. A. J. Day, T. P. Newcomb, "The dissipation of frictional energy from the interface of an annular disc brake", Proc. of the Institution of Mechanical Engineers, part D: transport engineering, vol. 198, no. 3, pp. 201-209, 1984.
  3. P. Dufrenoy, "Two-/three-dimensional hybrid model of the thermomechanical behaviour of disc brakes", Proc of the Institution of Mechanical Engineers, Part F: Journal of Rail and Rapid Transit, vol. 218, no. 1, pp. 17-30, 2004. DOI: https://doi.org/10.1243/095440904322804402
  4. C. H. Gao and X. Z. Lin, "Transient temperature field analysis of a brake in a non-axisymmetric threedimensional model", Journal of Materials Processing Technology, vol. 129, pp. 513-517, 2002. DOI: https://doi.org/10.1016/S0924-0136(02)00622-2
  5. C. H. Gao, J. M. Huang, X. Z. Lin, X. S. Tang, "Stress analysis of thermal fatigue fracture of brake disks based on thermomechanical coupling", Journal of tribology, vol. 129, no. 3, pp. 536-543, 2007. DOI: https://doi.org/10.1115/1.2736437
  6. A. A. Yevtushenko, P. Grzes, "The FEM-modeling of the frictional heating phenomenon in the pad/disc tribosystem (a review)", Numerical Heat Transfer, Part A: Applications, vol. 58, no. 3, pp. 207-226, 2010. DOI: https://doi.org/10.1080/10407782.2010.497312
  7. J. H. Choi and I. Lee, "Transient thermoelastic analysis of disk brake in frictional contact", Journal of Thermal Stresses, vol. 26, pp. 223-244, 2003. DOI: https://doi.org/10.1080/713855891
  8. J. H. Choi and I. Lee, "Finite element analysis of transient thermoelastic behaviors in disk brake", Wear, vol. 257, no. 1, pp. 47-58, 2004. DOI: https://doi.org/10.1016/j.wear.2003.07.008
  9. P. Hwang, X. Wu, "Investigation of temperature and thermal stress in ventilated disc brake based on 3D thermo-mechanical coupling model", Journal of mechanical science and technology, vol. 24, no. 1, pp. 81-84, 2010. https://doi.org/10.1007/s12206-009-1116-7
  10. J. U. Cho, M. S. Han, "Structural and Thermal Analysis of Disk Brake", Journal of the Korean Society of Manufacturing Technology Engineers, vol. 19, no. 2, pp. 211-215, 2010.
  11. C. Kang, G. Choi, "Thermal Fluid Flow and Deformation Analysis of Medium Commercial Vehicle Ventilated Brake Disc in Braking", Transactions of the Korean Society of Automotive Engineers, vol. 22, no. 7, pp. 63-69, 2014. DOI: https://doi.org/10.7467/KSAE.2014.22.7.063
  12. J. B. Ma, B. G. Lee, "Thermal Behavior of Ventilated Disc Brakes Considering Contact Between Disc and Pad", Journal of The Korean Society of Manufacturing Technology Engineers, vol. 23, no. 3, pp. 259-265, 2014. DOI: https://doi.org/10.7735/ksmte.2014.23.3.259
  13. C. K. Kim, J. T. Hwang, "Tribological Analysis on The Contact Behaviors of Disc Brake Due to Frictional Heating", Journal of KSTLE, vol. 15, no. 2, pp. 199-205, 1999.
  14. T. H. Lee, K. K. Lee, S. J. Jeong, "Optimal Design for the Thermal Deformation of Disk Brake by using Design of Experiments and Finite Element Analysis", Trans. of the KSME(A), vol. 25, no. 12, pp. 1960-1965, 2001.