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- W1513883934 abstract "The paper describes a model that can predict the noise emission of a compressor, taking into account both structure borne and air borne noise. Such a kind of model can be used to design shell and to uncouple sound sources and structural and cavity modes. The model was tested and validated on a production compressor. Each subsystem of the model has been validated by means of experimental modal analysis (shell and cavity). Finally the whole system was validated through measurement of the emitted sound power. NOMENCLATURE p: Acoustic pressure k: wave number INTRODUCTION Using BEM analysis techniques it is now possible to predict noise emission at the first stage of development of a new compressor and to try to uncouple the modes of the shell, the cavity and the muffler. The developed method has been applied to reduce noise emission from new shells. The knowledge of sources can be reached by experimental testing. As first characterization of the compressor, two sources were considered and measured: the frequency dependent structural loads and the pressure at the muffler’s outlet as in first approximation, these factors do not depend on the considered shell. Then the frequency response of the system due to structural loads and pressure was calculated and the shell was redesigned in order to uncouple resonances from sources. Measurements were also performed to validate the noise emissions’ calculation. The compressor considered and used for the tests has a refrigerant capacity of 78 Kcal/h in R600a fluid. NOISE SOURCES In a compressor there are three fundamental sources: ! Structural borne: due to impacts, unbalance, magnetic field, friction forces; ! Air borne: due to suction line; ! Fluid borne: due to gas pulsation at outlet pipe. The first two sources are more important for uncoupling the shell’s resonances and have been characterized through direct measurement of frequency loads: ! Load on supporting spring; ! Load pressure at muffler’s outlet. Structural borne load is transferred to the shell mainly through supporting springs: this was characterized measuring directly these forces. The most important air borne load is due to the suction line: this was characterized measuring the pressure at the outlet of the suction muffler. An experimental modal analysis on existing shell gave an estimation of the material’s modal damping factor; the used values were later confirmed by an experimental modal analysis performed on the redesigned shell." @default.
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- W1513883934 date "2002-01-01" @default.
- W1513883934 modified "2023-09-27" @default.
- W1513883934 title "Shell Optimisation Through Vibro-Acoustic Analysis" @default.
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