Vibro-acoustic characterization of flexible hose in CO2 car air conditioning systems

F. Angelini; A. Bergami; M. Martarelli; E. P. Tomasini

doi:10.1117/12.803168

17 June 2008 Vibro-acoustic characterization of flexible hose in CO₂ car air conditioning systems

F. Angelini, A. Bergami, M. Martarelli, E. P. Tomasini

Proceedings Volume 7098, Eighth International Conference on Vibration Measurements by Laser Techniques: Advances and Applications; 70981A (2008) https://doi.org/10.1117/12.803168
Event: Eighth International Conference on Vibration Measurements by Laser Techniques: Advances and Applications, 2008, Ancona, Italy

Abstract

Following the EU directive 2006/40/EC proscribing from 2011 that refrigerant fluids must have a global warming potential not higher than 150, it will not be allowed anymore to employ the current R134a on car air conditioning systems. Maflow s.p.a (automotive hose maker) is developing products for each possible new refrigerant. This paper is focused on hoses for CO₂ refrigerants operating in the worst conditions because of the high pressures and temperatures at which they are working (with R134a the high pressure is 18 bar and low pressure is 3 bar; with CO₂ the high pressure is 100 bar and low pressure is 35 bar). Therefore the noise emission control of the CO₂ air conditioning systems is very important. The aim of this study is to develop a standard measurement method for the vibro - acoustic characterization of High Pressure (HP - Shark F4) and Low Pressure (LP - ULEV) hoses to reduce noise emission and raise car passenger comfort; in particular deep research on high pressure hose. The method is based on the measurement of the vibration level of the hoses in a standard test bench by means of a Laser Doppler Vibrometer (LDV) and its acoustic emission by a sound intensity probe.

Citation Download Citation

F. Angelini, A. Bergami, M. Martarelli, and E. P. Tomasini "Vibro-acoustic characterization of flexible hose in CO₂ car air conditioning systems", Proc. SPIE 7098, Eighth International Conference on Vibration Measurements by Laser Techniques: Advances and Applications, 70981A (17 June 2008); https://doi.org/10.1117/12.803168

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