Application of the coherent-to-incoherent intensity ratio to estimation of ocean surface roughness from high-frequency, shallow-water propagation measurements

2010 ◽  
Vol 127 (3) ◽  
pp. 1258-1266 ◽  
Author(s):  
Philippe Roux ◽  
R. Lee Culver ◽  
Shane Walker
Keyword(s):  
Surface Roughness ◽  
Shallow Water ◽  
High Frequency ◽  
Intensity Ratio ◽  
Ocean Surface

On the relationship between sea state and the coherent‐to‐incoherent intensity ratio for high frequency, shallow water propagation

2005 ◽  
Vol 117 (4) ◽  
pp. 2433-2434
Author(s):  
Philippe Roux ◽  
William A. Kuperman ◽  
R. Lee Culver ◽  
Steven D. Lutz ◽  
David L. Bradley ◽  
...  
Keyword(s):  
Shallow Water ◽  
High Frequency ◽  
Intensity Ratio ◽  
Sea State ◽  
The Relationship

Influence of fetch limited surface roughness on mid‐to‐high frequency acoustic propagation in shallow water

2002 ◽  
Vol 112 (5) ◽  
pp. 2208-2208
Author(s):  
Robert Heitsenrether ◽  
Mohsen Badiey ◽  
James Kirby ◽  
Steve Forsythe
Keyword(s):  
Surface Roughness ◽  
Shallow Water ◽  
High Frequency ◽  
Acoustic Propagation ◽  
Limited Surface

Anatomy of the Ocean Surface Roughness

2002 ◽  
Author(s):  
Paul A. Hwang ◽  
David W. Wang ◽  
William J. Teague ◽  
Gregg A. Jacobs ◽  
Joel Wesson
Keyword(s):  
Surface Roughness ◽  
Ocean Surface

scholarly journals An Investigation of the High-Frequency Ultrasonic Vibration-Assisted Cutting of Steel Optical Moulds

Micromachines ◽  
2021 ◽  
Vol 12 (4) ◽  
pp. 460
Author(s):  
Canbin Zhang ◽  
Chifai Cheung ◽  
Benjamin Bulla ◽  
Chenyang Zhao
Keyword(s):  
Surface Roughness ◽  
Ultrasonic Vibration ◽  
High Frequency ◽  
Optical Glass ◽  
Contact Point ◽  
Cutting Speed ◽  
Optical Quality ◽  
Machining Parameters ◽  
Nose Radius ◽  
Cutting Geometry

Ultrasonic vibration-assisted cutting (UVAC) has been regarded as a promising technology to machine difficult-to-machine materials such as tungsten carbide, optical glass, and hardened steel in order to achieve superfinished surfaces. To increase vibration stability to achieve optical surface quality of a workpiece, a high-frequency ultrasonic vibration-assisted cutting system with a vibration frequency of about 104 kHz is used to machine spherical optical steel moulds. A series of experiments are conducted to investigate the effect of machining parameters on the surface roughness of the workpiece including nominal cutting speed, feed rate, tool nose radius, vibration amplitude, and cutting geometry. This research takes into account the effects of the constantly changing contact point on the tool edge with the workpiece induced by the cutting geometry when machining a spherical steel mould. The surface morphology and surface roughness at different regions on the machined mould, with slope degrees (SDs) of 0°, 5°, 10°, and 15°, were measured and analysed. The experimental results show that the arithmetic roughness Sa of the workpiece increases gradually with increasing slope degree. By using optimised cutting parameters, a constant surface roughness Sa of 3 nm to 4 nm at different slope degrees was achieved by the applied high-frequency UVAC technique. This study provides guidance for ultra-precision machining of steel moulds with great variation in slope degree in the pursuit of optical quality on the whole surface.

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