Hydroelastic variables influencing propeller and hydrofoil singing
Abstract
The phenomenon of 'singing' manifests itself as an exceptionally large amplitude of vibration or acoustic tone emitted at a particular speed in an operational range. A description is presented of an experimental determination of the parameters which govern the hydroelastic characteristics of hydrofoils and propellers. The flow-induced vibrations of simple cantilever hydrofoils have been measured for a set of structural samples which have varying degrees of structural damping and a variety of trailing-edge shapes. A series of wind tunnel measurements were also conducted to determine the flow-dependent excitation forces on the hydrofoils. Attention is given to analytical models of hydroelastic vibration, the observed hydroelastic effects, aerodynamic surface pressures induced by trailing edges, the effects of trailing-edge vibration, and an analysis of the self-excited vibrations.
- Publication:
-
Noise and Fluids Engineering
- Pub Date:
- 1977
- Bibcode:
- 1977asme.proc..191B
- Keywords:
-
- Acoustic Emission;
- Hydroelasticity;
- Hydrofoil Oscillations;
- Propeller Blades;
- Structural Vibration;
- Trailing Edges;
- Cantilever Beams;
- Resonant Vibration;
- Turbine Blades;
- Vibrational Spectra;
- Engineering (General)