Urban rapid railway is one of the most popular transportation methods these days. It is equipped with large-capacity air compressors since it uses pneumatic pressure to supply power for braking and for opening and closing doors. Passengers tend to complain about vibration and noise from the air compressor. In this study, vibration reduction of air compressor was achieved by acquiring exact complex dynamic stiffness of the mounting rubber and optimizing the shape of it. Target stiffness values of the rubber was obtained from multi-body dynamics simulation of the air compressor-mounting system. Complex elastic modulus of the rubber mount was derived through EMA and Gent’s method and verified by finite element method. Through parametric study of mounting rubber, an optimal shape of mounting rubber was derived and produced. Lastly, the proposed value was verified by experiments comparing with baseline value.
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Cross-sectional area of the rubber
Complex elastic modulus
Force to rubber
Magnitude of force
- kaxial :
Stiffness in axial direction
- kradial :
Stiffness in radial direction
Magnitude of complex stiffness
Length of the rubber
Shape factor of the rubber
Displacement of rubber
Magnitude of displacement
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This research was supported by 2019 Hongik University Research Fund and a grant (20RTRP-B148337-03) from “Development of high-performance interchangeable standard flexible brake pads and shoes for power concentrated high speed trains” funded by Ministry of land, Infrastructure and Transport of Korean government.
Uyeup Park is a M.S. candidate in Mechanical Engineering at Hongik University. He received his B.S. in Mechanical and System Engineering at Hongik University. His research interests include vibration reduction of compressor and optimization algorithm.
Jun Heon Lee is a Ph.D. candidate in Mechanical Engineering at Hongik University. He received his M.S. in Mechanical Engineering at Hongik University in 2013. His research interests are NVH analysis and EMA.
Kwanju Kim is a Professor of Mechanical and System Engineering at Hongik University. He received his Ph.D. in Mechanical Engineering from Stanford University in 1987. He worked as a Senior Researcher at Kia motors research center in 1988`-1992. His research field is NVH issues of transportation.
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Park, U., Lee, J.H. & Kim, K. The optimal design of the mounting rubber system for reducing vibration of the air compressor focusing on complex dynamic stiffness. J Mech Sci Technol 35, 487–493 (2021). https://doi.org/10.1007/s12206-021-0107-1
- Air compressor
- Mounting rubber
- Vibration reduction
- Parametric study
- Shape optimization