Optimisation of acoustic properties of suction mufflers inside hermetic compressors has become an important research field. One useful measurable quantity for acoustic optimization of suction mufflers is the insertion loss. This quantity is strongly dependent on frequency, which is mainly due to the presence of troughs and peaks at certain frequencies. Consequently, this makes it difficult to optimise the insertion loss at all frequencies. In practice, acoustic optimisation must be focused around a limited number of frequencies, for instance, those of certain source components and cavity modes. In this paper some new insights concerning the dependence of the insertion loss on the boundary conditions inside the muffler cavity and around the suction inlet are given. Furthermore, relatively simple experimental methods for the characterization of sources and cavity modes will be discussed.
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