Acoustic design of exhaust silencers and suction mufflers
For the effective acoustic design of exhaust silencers and suction mufflers, we carry out both analytic modeling and numerical computations. Thereby the following effects are taken into account:
- acoustic characteristics, operating status and performance of the machine or the device respectively
- fluid properties such as composition, flow, temperature gradient, corrosiveness
- permitted pressure drop
- available installation space
Design and manufacture of mufflers
In cooperation with the Institute for Manufacturing Technology and Applied Materials Research at the Fraunhofer Gesellschaft, we use metallic hollow sphere structures as a self-supporting absorber material for special exhaust silencers for combustion engines.
In combination with high-temperature-resistant alloys, this special absorber can be used in the immediate vicinity of catalytic converters, where the exhaust gas heats up to approx. 1000 °C.
Testing of mufflers
Subsequent to the acoustic design of exhaust silencers and suction mufflers, first pre-measurements can be carried out – without major design effort – by means of a modular muffler kit directly on the machine or the device respectively.
Furthermore, the innovative measuring system AcoustiTube® HighTemp allows the measurement of the transmission loss of exhaust silencers in situ for near-service conditions and temperatures up to 600°C. The measurement results can be processed further using the software AcoustiCalc® Silencer, e.g. to calculate the effectiveness of a complete exhaust system.
