Dynamic Analysis and Isolation Effectiveness of a Low Stiffness Nonlinear Isolator
Corressponding author's email:
ledanhiuh@gmail.comDOI:
https://doi.org/10.54644/jte.72A.2022.1243Keywords:
Pneumatic cylinder;, Auxiliary chamber, Low dynamic stiffness, Nonlinear vibration isolator, Low Frequency isolationAbstract
This paper presents a low stiffness nonlinear vibration isolator using a pneumatic spring with an auxiliary chamber which is shortened by LSNVI. Firstly, the mechanical model of the isolator, which is constructed by two opposite stiffness mechanisms includes the load bearing mechanism (LBM) and the stiffness corrected mechanism (SCM), is introduced. Secondly, the restoring force of the model is found. Based on this, the dynamic stiffness is calculated numerically. Then, the spring force curve was approximated by expanding the Taylor series to order-5. Next, a numerical simulation is carried out to investigate the effect of the pressure ratio on the system stiffness. Simultaneously, by using the Multi-scale method, the frequency-amplitude relation curve is analyzed. The vibration transmissibility characteristic of the LSNVI is simulated and compared with that of the equivalent traditional nonlinear vibration isolator (named NVI-non SCM) in which the SCM is removed. The simulation results illustrate that the isolation effectiveness of the former is better than the latter. This result shows that the LSNVI can offer a vision isolation performance. This presentation furnishes a useful insight into the design for low frequency vibration isolation model
Downloads: 0
References
C. Wogerer , G. Nittmann and T. Panner, “Isolation of small coil spring,” IEEE International Symposium on Assembly and Manufacturing, 2007, pp. 130-134.
S.G. Kelley, Fundamental of mechanical vibrations, New York, McCraw-Hill, 2002.
E.J. Chin, K.T. Lee, J. Winterflood, L. Ju and D.G. Blair, “Low frequency vertical geometric anti-spring vibration isolators,” Physics letters A, vol.336, no. 2-3, pp. 97 – 105, 2005.
J. Winterflood, D.G. Blair, and B. Slagmolen, “High performance vibration isolation using springs in Euler column buckling mode,” Physics Letters A, vol.300, pp.122–130, 2002.
W. Wu, X. Chen and Y. Shan, “Analysis and experiment of a vibration isolator using a novel magnetic spring with negative stiffness,” Journal of Sound and Vibration, vol.333, pp. 2958-2970, 2014.
B. Yan, H. Ma, C. Zhao, C. Wu, K. Wang and P. Wang, “A Vari-stiffness nonlinear isolator with magnetic effects: Theoretical modeling and experimental verification,” International Journal of mechanical and Sciences, vol.148, pp.745-775, 2018
A. Carrella, M.J. Brennan, T. P. Waters and K. Shin, “On the design of a high-static–low-dynamic stiffness isolator using linear mechanical springs and magnets,” Journal of Sound and vibration, vol.315, pp. 712-720, 2008.
Y. Zheng, Q. Li, B. Yan, Y. Lu and X. Zheng, “A stewart isolator with high-static–low-dynamic stiffness struts based on negative stiffness magnetic springs,” Journal of Sound and vibration, vol.422, pp.390-408, 2018.
G. Dong, X. Zhang, Y. Luo, Y. Zhang and S. Xie, “Analytical study of the low frequency multi-direction isolator with high-static-low-dynamic stiffness struts and spatial pendulum,” Mechanical Systems and Signal Processing, vol.110, pp.521–539, 2018.
G. Dong, X. Zhang, Y. Luo, Y. Zhang, and S. Xie, “Analytical study of the low frequency multi-direction isolator with high-static-low-dynamic stiffness struts and spatial pendulum,” Journal of Mechanical Systems and Signal Processing, Vol.110, pp.521–539, 2018.
M.W. Holtz and J.L.V. Niekerk, “Modeling and design of a novel air-spring for a suspension seat,” Journal of Sound and vibration, vol.329, pp.4354-4366, 2010.
I. Maciejewski, L. Meyer and T. Krzyzybski, “The vibration damping effectiveness of an active seat suspension system and its robustness to varying mass loading,” Journal of Sound and vibration, vol.329, pp.3898-3914, 2010.
I. Maciejewski, “Control system design of active seat suspension,” Journal of Sound and vibration, vol.331, pp.1291-1309, 2012.
M.M. Moheyeldein, A.M. Abd-El-Tawwab, K.A. Abd El-gwwad band M.M.M Salem, “An analystical study of the performance indices of air spring suspensions over the passive suspension,” Beni-Suef University Journal of Basic and Applied Sciences, vol.7, pp.525-534, 2018.
I. Maciejewski, S. Glowinski and T. Krzyzybski, “Active control of a seat suspension with the system adaptation to varying load mass,” Mechatronics, vol.24, pp.1242-1253, 2014.
X. B. Tran, V. L. Nguyen, and K.D.Tran, “Effects of friction models on simulation of pneumatic cylinder,” Mechanical Science, vol.10, pp.517–528, 2019.
C. H. Nguyen, C. M. Ho and K. K. Ahn, “An Air Spring Vibration Isolator Based on a Negative-Stiffness Structure for Vehicle Seat,” Journal of Applied Science, vol.11, 2021.
N.Y.P. Vo and T.D. Le, “Static analysis of low frequency isolation model using pneumatic cylinder with auxiliary chamber,” International Journal of Precision Engineering and Manufacturing, vol.21, pp.681-697, 2020.
Downloads
Published
How to Cite
Issue
Section
Categories
License
Copyright (c) 2022 Journal of Technical Education Science
This work is licensed under a Creative Commons Attribution-NonCommercial 4.0 International License.
Copyright © JTE.
