This content is not included in
your SAE MOBILUS subscription, or you are not logged in.
Analysis of Vibro-Acoustic Propagation Generated by an Automotive Refrigeration System
Technical Paper
2014-36-0773
ISSN: 0148-7191, e-ISSN: 2688-3627
Annotation ability available
Sector:
Language:
English
Abstract
Air conditioning systems are being increasingly applied in the Brazilian automotive industry becoming indispensable rather than an optional item for car buyers, who are constantly seeking out more comfort. Conversely, the application of these systems in motor vehicles involve the use of compressors which operate at high pressures, making them important sources of vibration and unwanted noise in the cabin of the vehicle, thus causing vibratory discomfort and noise annoyance. Despite the major technological developments in automotive air conditioning systems, there is still a shortage of engineering research conducted in the field of vibration and noise originated in these particular systems. The present study is aimed at investigating and characterizing experimentally the vibration and acoustic propagation in the interior of a vehicle, generated by the compressor of the air conditioning system. In order to allow correlation between noise and vibration, measurements were taken over time using the acquisition system LMS SCADAS, in two conditions: increasing rotation in the engine and stabilized rotation at the highest noise level. The data collected was processed and analyzed using different methodologies in time and frequency domain using the LMS software Test.Lab v.12A. The results show that the noise emitted by the air conditioning system is related to the operating rotational speed of the compressor and the H6 and H12 harmonics are the most emissive inside the cabin. Moreover, the results indicate that the vibration propagation happens primarily via the condenser. Therefore, a quieter system can be produced by a close cooperation between car vehicle and compressor.
Authors
Citation
Santos, R., Sabioni, J., Abrahão, C., and Ramos, A., "Analysis of Vibro-Acoustic Propagation Generated by an Automotive Refrigeration System," SAE Technical Paper 2014-36-0773, 2014, https://doi.org/10.4271/2014-36-0773.Also In
References
- Priede T. 1971 J. Sound and Vibration 61 73 Origins of Automotive Vehicle Noise
- Sheng G. , Lee J. H. , Narravula V. , Song D. 2011 Tribology International 258 265 Experimental characterization and analysis of wet belt friction and the vibro-acoustic behavior
- Yasuda T. , Wuc C. , Nakagawa N. , Nagamura K. 2013 Applied Acoustics 49 57 Studies on an automobile muffler with the acoustic characteristic of low-pass filter and Helmholtz resonator
- Mavuri , S , Watkins , S , Wang , X , St Hill , S and Weymouth , D. 2008 SAE World Congress Detroit, United States An investigation of vehicle HVAC cabin noise
- Leite R.P. , Paul S. , Gerges S.N.Y. 2009 Applied Acoustics 636 645 A sound quality-based investigation of the HVAC system noise of an automobile model
- Molisani L.R. , Burdisso R.A. , Tsihlas D. 2003 International Journal of Solids and Structures 5125 5138 A coupled tire structure/acoustic cavity model
- Minton's Automotive, Air Conditioning http://www.mintonsautomotive.com/Air-Conditioning.html sept. 2010
- Santos , E. Dimensionamento e avaliação do ciclo de refrigeração de sistema de climatização automotivo 2005 109 Trabalho final de curso (Mestrado Profissionalizante em Engenharia Automotiva)-Escola Politécnica da Universidade de São Paulo São Paulo 2005
- Tian , C. , Xu , H. , Zhang , L. and Li , X. 2009 Applied Thermal Engineering 2824 2831 Experimental investigation on the characteristics of variable displacement swash plate compressor
- Tian , C. , Li , X. and Yang X. 2005 Applied Energy 82 1 22 Numerical analysis of evaporator frosting in automotive air-conditioning system with a variable-displacement compressor