Available files: ANSYS files (ANSYS Harmonic Acoustics), SolidWorks CAD Files, Report and PowerPoint Presentation.
An industrial expansion silencer (exhauster) may be termed a ‘transmission line filter’. It has broad noise stop bands, with the Transmission Loss (TL) peaking at frequencies where expansion length (L) is an odd multiple of quarter-wavelengths, and becoming zero at frequencies where L is an even number of half-wavelengths. The peak TL values are greater for larger values of larger areas of expansion. Acoustic wave interference effects are responsible for the behaviour of the expansion chamber. It must be noted that the expansion chamber does not absorb sound energy, but reflects it back to the sound source. It is a ‘reactive’ rather than a ‘dissipative’ device. In the computation of silencer performance, it is clearly preferable to implement a series of simple algorithms in sequence, rather than to involve cumbersome formulae. Therefore, two modelling approached may be employed; (1) the ‘scattering matrix’ approach, in which incident and reflected plane wave pressures on either side of a discontinuity in the pipe are related via scattering matrix and (2) ‘the four-pole matrix’ formulation, in which sound pressures and velocities on either side of a discontinuity or other element are related via a four-pole matrix. The main aim of this research work is to apply analytical and numerical methods to investigate the performance of an industrial expansion silencer and validate the results based on existing empirical results. ANSYS Harmonic Acoustics module will be used in the study. Make this purchase and get a sample complete engineering thesis report on this topic as well as the corresponding ANSYS files, SolidWorks CAD Files and PowerPoint Presentation file.