1539. Analysis of stiffness characteristics of a new fluid bag for axial shock protection

Ming Zhang1, Rui Jiang2, Hong Nie3

1, 2Key Laboratory of Fundamental Science for National Defense-Advanced Design Technology of Flight Vehicle, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China

3State Key Laboratory of Mechanics and Control of Mechanical Structures,
Nanjing University of Aeronautics and Astronautics, Nanjing, China

1Corresponding author

E-mail: 1zhm6196@126.com, 21134529409@qq.com, 3hnie@nuaa.edu.cn

(Received 14 July 2014; received in revised form 2 September 2014; accepted 1 October 2014)

Abstract. In view of large loads being needed to protect the axial from the shock situation under small displacement and deformation, a new fluid bag for axial protection was designed in Abaqus. Hydrostatic fluid elements were used to simulate fluid. Interaction between the fluid and bag was simulated with the hydrostatic theory. Based on the finite element theory, the axial stiffness of fluid bag was calculated. The results show that the stiffness had good linearity. The difference between the simulation and experiment results is small, proving the correctness of simulation. The effects of initial bag pressure on the stiffness were discussed. The results indicate that different initial pressures have few impacts on the stiffness as well as tendency of bag pressure variations. Then the effects of bag material properties and fluid bulk modulus on the stiffness were discussed. The results show that both of them are the key factors determining the stiffness. The effects of fluid bag on the stress of a mechanism under axial shock load were discussed. The results show that the fluid bag has a good performance for axial protection.

Keywords: fluid bag, axial stiffness, factors affecting the stiffness, axial protection.

References

[1]        Chew A., Brewster B., Olsen I., et al. Developments in nEXT turbomolecular pumps based on compact metal spring damping. Vacuum, Vol. 85, Issue 12, 2011, p. 1156‑1160.

[2]        Cho J. R., Moon S. J., Moon Y. H., et al. Finite element investigation on spring-back characteristics in sheet metal U-bending process. Journal of Materials Processing Technology, Vol. 141, Issue 1, 2003, p. 109‑116.

[3]        Chan W. M., Chew H. I., Lee H. P., et al. Finite element analysis of spring-back of V-bending sheet metal forming process. Journal of Materials Processing Technology, Vol. 148, Issue 1, 2004, p. 15‑24.

[4]        Berg M. A non-linear rubber spring model for rail vehicle dynamics analysis. Vehicle System Dynamics, Vol. 30, Issues 3‑4, 1998, p. 197‑212.

[5]        Wang L. R., Lu Z. H., Hagiwara I. Finite element simulation of the static characteristics of a vehicle rubber mount. Proceedings of the Institution of Mechanical Engineers, Part D: Journal of Automobile Engineering, Vol. 216, Issue 12, 2002, p. 965‑973.

[6]        Luo R. K., Wu W. X. Fatigue failure analysis of anti-vibration rubber spring. Engineering Failure Analysis, Vol. 13, Issue 1, 2006, p. 110‑116.

[7]        Toyofuku K., Yamada C., Kagawa T., et al. Study on dynamic characteristic analysis of air spring with auxiliary chamber. JSAE Review, Vol. 20, Issue 3, 1999, p. 349‑355.

[8]        Xiao J., Kulakowski B. T. Sliding model control of active suspension for transit buses based on a novel air-spring model. American Control Conference, 2003, p. 3768‑3773.

[9]        Presthus M. Derivation of air spring model parameters for train simulation. Masterís Thesis, Department of applied physics and mechanical engineering, Division of fluid mechanics, LULEA University, 2002.

[10]     Tsai C. L., Guan Y. L., Ohanehi D. C., et al. Analysis of cohesive failure in adhesively bonded joints with the SSPH meshless method. International Journal of Adhesion and Adhesives, Vol. 51, 2014, p. 67‑80.

[11]     Dorn L., Liu W. The stress state and failure properties of adhesive-bonded plastic/metal joints. International Journal of Adhesion and Adhesives, Vol. 13, Issue 1, 1993, p. 21‑31.

[12]     Gent A. N., Yeoh O. H. Failure loads for model adhesive joints subjected to tension, compression or torsion. Journal of Materials Science, Vol. 17, Issue 6, 1982, p. 1713‑1722.

[13]     Giner E., Sukumar N., Tarancon J. E., et al. An Abaqus implementation of the extended finite element theory. Engineering Fracture Mechanics, Vol. 76, Issue 3, 2009, p. 347‑368.

[14]     Chang B., Shi Y., Lu L. Studies on the stress distribution and fatigue behavior of weld-bonded lap shear joints. Journal of Materials Processing Technology, Vol. 108, Issue 3, 2001, p. 307‑313.

[15]     Al-Samhan A., Darwish S. M. H. Finite element modeling of weld-bonded joints. Journal of Materials Processing Technology, Vol. 142, Issue 3, 2003, p. 587‑598.

[16]     Goncalves V. M., Martins P. A. F. Static and fatigue performance of weld-bonded stainless steel joints. Materials and Manufacturing Processes, Vol. 21, Issue 8, 2006, p. 774‑778.

[17]     Wakui S. Incline compensation control using an air-spring type active isolated apparatus. Precision Engineering, Vol. 27, Issue 2, 2003, p. 170‑174.

[18]     Shimozawa K., Tohtake T. An air spring model wit non-linear damping for vertical motion. Quaterly Report of RTRI, Vol. 49, Issue 4, 2008, p. 209‑214.

[19]     Wang J. S., Zhu S. H. Linearized model for dynamic stiffness of air spring with auxiliary chamber. Journal of Vibration and Shock, Vol. 28, Issue 2, 2009, p. 72‑76, (in Chinese).

[20]     Lan Qing-qun, Wu Ping-bo Static and dynamic analysis of rubber spring for rolling stock. Machinery Design and Manufacture, Vol. 11, 2008, p. 43‑45, (in Chinese).

[21]     Abaqus 6.10 Online Documentation. Abaqus Theory Manual, 4-28-2010.

[22]     Gong Longying On the use of Abaqus for analyzing the problem of contacts. China Coal, Vol. 35, Issue 7, 2009, p. 66‑68, (in Chinese).

Cite this article

Zhang Ming, Jiang Rui, Nie Hong Analysis of stiffness characteristics of a new fluid bag for axial shock protection. Journal of Vibroengineering, Vol. 17, Issue 2, 2015, p. 587‑601.

 

© JVE International Ltd. Journal of Vibroengineering. Mar 2015, Volume 17, Issue 2. ISSN 1392-8716