Description
Areas of application
- Mode distribution: Determination of acoustic mode distributions in pipe systems and turbomachinery.
- Geometries: Application in non-flow geometries as well as in ducts with uniform or swirling flow.
- Noise reduction: Analysis and optimization of silencers and other noise reduction systems.
Functionality and advantages
- Measurement principle:
- Wall-flush microphones record sound pressures at various circumferential and axial positions.
- Fourier analysis (FFT) identifies azimuthal orders of the sound pressure modes.
- Solution of linear systems of equations calculates radial mode orders.
- Advantages:
- Precise analysis of complex sound fields.
- Suitable for different flow conditions and geometries.
- High flexibility due to customizable measurement setups.
Technical details
- Measurement variables:
- Sound pressure frequency and blade change frequency.
- Circumferential and radial amplitudes.
- Phase, radial and circumferential mode order.
- Measurement setup:
- Number of microphones determines the maximum detected mode order.
- Combination of microphone positions in circumferential and axial direction for comprehensive data acquisition.
