Calculations
The acoustic performance of silencers depends on
- the fluid properties (in particular the speed of sound and the density of the fluid depending on the application/operating conditions of the muffler),
- the geometry of the muffler,
- the acoustic properties of the absorber material used in conjunction with perforated covers and
- the frequency-dependent sound power of the noise source to be reduced.
Within the software, parameterized silencer elements enable the quick and simple variation of all influencing factors in order to adapt absorption mufflers as best as possible to the noise source to be reduced.
The following results are calculated by the absorption silencer software:
- spectral transmission loss and total sound power level difference (Z-, A- and C-weighted) between inlet and outlet of the muffler based on complex silencer models from relevant technical literature
- spectral sound power level and total sound power level (Z-, A- and C-weighted) at the silencer outlet
- maximum flow velocity inside the silencer
- estimation of the pressure loss of the silencer and the flow-induced total sound power level inside the silencer based on analytical descriptions from relevant technical literature
Advantages
The graphical user interface (GUI) of the absorption muffler software is designed as a single-page application, which offers a very intuitive user experience due to its clear structure. All relevant GUI components are very quickly accessible to support a fast and effective workflow.
All spectral data is presented in both tabular and graphical form to ensure quick and easy understanding. The export/import functions are also very flexible and allow effortless further processing of the results (e.g. in reports or construction manuals).
The absorption silencer software enables the acoustic design of sound-absorbing lined ducts (pipe silencers) and rectangular silencers with parallel sound-absorbing baffles (parallel baffle silencers).
For better ergonomics, it is even possible to predefine sub-elements – such as absorber materials, perforated covers and liquid – through individual configuration files.
The following figure shows exemplary parameterized geometries of parallel baffle silencers and pipe silencers.
Parallel baffle silencer with plane inflow side of the sound-absorbing baffles with perforated cover
Parallel baffle silencer with streamlined inflow side of the sound-absorbing baffles with perforated cover
Pipe silencer with sound-absorbing lining on all sides with perforated cover
Pipe silencer with parallel sound absorbing baffles with perforated cover and streamlined inflow side
