Suspension Design Optimization of a Hermetic Compressor for Improved Vibrational Behavior

Document Type : Research Article


1 University of Tehran, ME School

2 دانشگاه تهران-مهندسی مکانیک

3 دانشگاه تهران


Abnormalities in the vibrational behavior of driving motors and their side effects have always been a chief concern for home appliance manufacturers. Hermetic compressors used in refrigerators are no exception in this matter. As a single-piston reciprocating machine with a crankshaft driven by a simple rotor-stator system, compressors can have noticeable vibrational dissonances. The compressor’s vibration is considered as a source of noise that can be transferred to other parts of the refrigerator and disturbingly excite them. Despite multiple studies to isolate this vibration by removing or optimizing its pathways, the focus has never been directly on reducing the vibration of the main source. In this study, a 6 Degree of Freedom model of a refrigerator compressor is derived and then simulated in MATLAB-Simulink. The model is then verified with the computational results of an equivalent model made in ADAMS. All vibrating parts and their indexes are identified in order to design a new suspension system with improved vibrational behavior. A genetic algorithm is used to minimize an acceleration-based objective function considering six optimization variables including the stiffness parameters of springs and their arrangement. The optimized springs were built and tested under an actual compressor, and the time/frequency responses of the compressor were compared with the initial system. The results show the enhanced vibrational behavior of the compressor in its working frequency after optimization.


Main Subjects

[1] K. Imaichi, N. Ishii, K. Imasu, S. Muramatsu, M. Fukushima, A Vibration Source in Refrigerant Compressors, Journal of Vibration and Acoustics, 106(1) (1984) 122-128.
[2] J.M. Juran, A.B. Godfrey, Juran's Quality Handbook, McGraw Hill, 1999.
[3] H.S. Han, W.B. Jeong, M.S. Kim, S.Y. Lee, M.Y. Seo, Reduction of the refrigerant-induced noise from the evaporator-inlet pipe in a refrigerator, International Journal of Refrigeration, 33(7) (2010) 1478-1488.
[4] D. Balandin, N. Bolotnik, W. Pilkey, Optimal shock and vibration isolation, Shock and Vibration, 5(2) (1998) 73-87.
[5] T.A. Brungart, E.T. Riggs, Rotor isolation for vibration and noise reduction, Journal of vibration and acoustics, 125(3) (2003) 407-411.
[6] J. Lee, A.H. Ghasemi, C.E. Okwudire, J. Scruggs, A linear feedback control framework for optimally locating passive vibration isolators with known stiffness and damping parameters, Journal of Vibration and Acoustics, 139(1) (2017) 011006.
[7] P. Gardonio, S. Elliott, Passive and active isolation of structural vibration transmission between two plates connected by a set of mounts, Journal of Sound and Vibration, 237(3) (2000) 483-511.
[8] P. Guo, Z. Lang, Z. Peng, Analysis and design of the force and displacement transmissibility of nonlinear viscous damper based vibration isolation systems, Nonlinear Dynamics, 67(4) (2012) 2671-2687.
[9] M. Zehsaz, M. Sadeghi, M. Ettefagh, F. Shams, Tractor cabin’s passive suspension parameters optimization via experimental and numerical methods, Journal of Terramechanics, 48(6) (2011) 439-450.
[10] Z. Chi, Y. He, G.F. Naterer, Design optimization of vehicle suspensions with a quarter-vehicle model, Transactions of the Canadian Society for Mechanical Engineering, 32(2) (2008) 297-312.
[11] M. Mahmoodi-Kaleibar, I. Javanshir, K. Asadi, A. Afkar, A. Paykani, Optimization of suspension system of off-road vehicle for vehicle performance improvement, Journal of central south university, 20(4) (2013) 902-910.
[12] M.S. Reddy, P. Vigneshwar, M.S. Ram, D.R. Sekhar, Y.S. Harish, Comparative Optimization Study on Vehicle Suspension Parameters for Rider Comfort Based on RSM and GA, Materials Today: Proceedings, 4(2) (2017) 1794-1803.
[13] R.W. Carpick, D. Ogletree, M. Salmeron, Lateral stiffness: A new nanomechanical measurement for the determination of shear strengths with friction force microscopy, Applied Physics Letters, 70(12) (1997) 1548-1550.
[14] Z. He, Z. Jian, T. Wang, D. Li, X. Peng, Investigation on the variation of pressure in the cylinder of the refrigerator compressor based on FSI model, in:  IOP Conference Series: Materials Science and Engineering, IOP Publishing, 2017, pp. 012005.
[15] G. Genta, Dynamics of rotating systems, Springer Science & Business Media, 2007.
[16] J.E. Shigley, Mechanical engineering design,  (1972).