Research on acoustical curved ducts has been widely discussed. Cummings [1], in 1974, assessed the acoustical performance for a curved duct with rectangular/circular cross sections. Rostafinski [2] proposed a wave equation for a sound wave propagating along a curved duct. In 1978, Fuller and Bies [3, 4] theoretically analyzed the acoustical performance of a reactive silencer comparing the difference between the curved duct and the straight duct. In 1994, Selamet et al. [5] predicted the transmission loss of a Hershel-Quinckee tube using a two-node technique. This study proved to be accurate experimentally; however, the application was limited to a narrow band frequency. In 1999, Kim and Ih [6] developed an acoustical mathematical model for a curved duct and an expansion chamber using a four-pole transfer matrix. Suh et al. [7], in 1998, investigated the acoustical performance for a reciprocating compressor using a finite element method. Dreiman et al. [8] also analyzed the noise and vibration induced by the pressure pulse from a reciprocating compressor using a boundary element method in 2000. Gosavi et al. [9], in 2006, presented an optimal design method for a reciprocating compressor using the Taguchi method in conjunction with a boundary element method. However, the noise abatement of a reciprocating compressor focused on the suction muffler only. In order to enhance the acoustical performance of the reciprocating compressor, an acoustical assessment for seven noise control strategies on a suction muffler and a discharge muffler of the reciprocating compressor will be introduced and simulated by using a finite element method (FEM) run on COMSOL.
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