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Waviness and roughness [8]

Waviness and roughness [8]

Source publication
Figure 1: Sketch of the machining process
Figure 2: Example of unfiltered signal of a hydrofoil roughness
table 2 .
Figure 3: Waviness and roughness [8]
shows the peak heights and peak to valley values of each hydrofoil...
An Experimental Analysis of the Effect of Roughness Produced by Machining on Hydrodynamic Performance of Two-Dimensional Hydrofoil
Conference Paper
Full-text available
  • Jun 2003
Modern manufacturing means, 5-axis machining in particular, are now applied to propellers since they allow free forms to be obtained. They also allow a very smooth finish while maintaining geometrical accuracy that hand-driven finishing cannot assure. Propellers manufacturers tend to propose blades of great surface finish, even mirror-polished to e...
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Contexts in source publication

Context 1
... example of an unfiltered signal is shown on figure 2. Then, form and waviness were removed to obtain the roughness profiles ( figure 3) before analysis. Since the lay is the most influent parameter on the surface irregularities of hydrofoils we will focus our study on the roughness of the profiles. ...
Context 2
... Power Spectral Density (PSD) analysis has also been carried out on the hydrofoils roughness signal after form and waviness removal ( figure 3). The PSD shows the peak wavelength value Wl = 0.487 mm, with its corresponding amplitude A = 0.91 µm. ...

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Citations

Design for Manufacturing applied to Hydroifoils dedicated to Marine Propellers
Conference Paper
Full-text available
  • Mar 2007
Performances of propellers are linked with their shape and texture surface characteristics. A mirror surface is considered an excessive quality as an additional manufacturing cost is required. This paper presents a study of a compromise between the compliance with hydrodynamic performances and manufacturing costs. Due to the machining paths, a model linking the finish of the surface to the hydrodynamic performances is studied.Three hydrofoils are machined with different roughness. Roughness peaks are parallel to the flow. Hydrofoils are machined and tested in the hydrodynamic tunnel, then the influence of the finish of the surface on the hydrodynamic performances and cavitation is analyzed.
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