Title: Model and experimental analysis of the dynamic behaviour of air conditioning plant pipelines

Authors: Massimo Sorli, Andrea Almondo, Walter Franco, Ermanno Giorcelli

Addresses: Department of Mechanics, Politecnico di Torino, C.so Duca degli Abruzzi 24, 10129 Turin, Italy. ' Department of Mechanics, Politecnico di Torino, C.so Duca degli Abruzzi 24, 10129 Turin, Italy. ' Department of Mechanics, Politecnico di Torino, C.so Duca degli Abruzzi 24, 10129 Turin, Italy. ' Department of Mechanics, Politecnico di Torino, C.so Duca degli Abruzzi 24, 10129 Turin, Italy

Abstract: This paper presents a model to describe the transmission of vibrations through the pipelines of automotive air conditioning plants. It is known that vibration propagating from the compressor to the other system components can affect both acoustical and structural behaviour. In this study a frequency domain description is purposed, using a transfer matrix formulation to study the pipe dynamics. This approach is particularly effective in the analysis of viscoelastic pipes, whose elastic and damping properties vary as a function of strain frequency. A method to identify the characteristics of the pipe wall material by dynamic tests is described. The model is then applied to the study of complex metal and viscoelastic pipe layouts, showing the good accordance between prediction and experimental data measured on test bench.

Keywords: pipe dynamics; pipeline vibration; viscoelastic materials; transfer matrix model; automotive air conditioning; strain frequency; elastic properties; damping properties; vehicle vibration; air conditioning plant pipelines.

DOI: 10.1504/IJVNV.2006.008526

International Journal of Vehicle Noise and Vibration, 2006 Vol.2 No.1, pp.41 - 61

Published online: 28 Dec 2005 *

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