Air cushion patterns
Looking for an online digram that shows the wake/wash pattern of a air-cushion vessel and or a hovercraft. Looking to compare and contrast such footprints with that of conventional, displaced vessels for a research project on riverbank erosion.
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Re: Air cushion patterns
For a variety of wake images see: http://www.cyberiad.net/wakeimages.htm
Also see (for a variety of air cushion pressure distributions): "Wave Patterns and Minimum Wave Resistance for High-Speed Vessels", E.O. Tuck, D.C. Scullen and L. Lazauskas, 24th Symposium on Naval Hydrodynamics, Fukuoka, 2004. http://www.cyberiad.net/library/pdf/tsl02b.pdf All the best, Leo. |
Re: Air cushion patterns
got it. seems to be a lack of published material on transport carrying hovercraft.
jia |
Re: Air cushion patterns
The "FAST" series of conference proceedings has a few references, but there isn't much, around as you said. Also look at CCdoT which assessed many different types of sea-lift vessels including hovercraft, SES and some other hybrids.
I've done some calculations for large (>10000t) hovercraft travelling at 100+ knots, but I doubt that anyone would want to build such frightening things. All the best, Leo. |
Re: Air cushion patterns
is CCDOT California DOT ?
If you have stats on a larger hovercraft sure I'd be interested in taking a look at these. b/r, jia |
Re: Air cushion patterns
Sorry, CCDoTT is: "Center For The Commercial Deployment Of Transportation Technologies"
The conference I was referring to was: "High-Speed Sealift Technology". The most important conference documents to get are at: www.ccdott.org/Deliverables/1997/task2.0.1/task2.0.1_m.htm There are many references you can glean from: Lazauskas, L.,"Hydrodynamics of advanced high-speed sealift vessels", www.cyberiad.net/library/pdf/llmsc.pdf For an examination of (unachievable?) optimal pressure distributions see: Tuck, E.O. and Lazauskas, L., "Free-surface pressure distributions with minimum wave resistance", www.cyberiad.net/library/pdf/tl01.pdf Cheers, Leo. |
Re: Air cushion patterns
It was a bit egotistical citing only my own papers. Anyone doing serious research on air-cushion vessels must look at the work of Lawrence J. Doctors who is probably the world's leading authority. In particular see: "On the use of pressure distributions to model the hydrodynamics of air-cushion vehicles and surface effect ships", Naval Engineers Journal, March 1993.
Now back to me again. :) If you are interested in evaluating damage to the littoral zone by large fast ships, you might also consider the pressures induced on the sea-bottom. I've included some bottom pressure signatures for a large displacement vessel in: "The hydrodynamic resistance, wave wakes and bottom pressure signatures of a 5900t displacement air warfare destroyer", Dept. Applied Mathematics Report, The University of Adelaide. www.cyberiad.net/library/pdf/nibberluna0.pdf Unfortunately I don't know enough to assess whether those pressures are significant in terms of disruption to sea-grass beds and the fauna that rely on them. Regards, Leo. |
Re: Air cushion patterns
thanks and obliged. after reading over your beta i read up on pressures and was wondering are studies available that shows the pressure bubble: depth and width of a hovercraft at different lift pressures ?
b/r, jia |
Re: Air cushion patterns
I'm not sure what you mean by the "pressure bubble". Do you mean contour plots of the over-pressure, or do you mean the elevations of the free-surface under the pressure patch? Or something else?
Leo. |
Re: Air cushion patterns
leo,
Can't rightly say but contour plots of the over-pressure and the elevations of the free-surface under the pressure patch seems to meet the issue. that is what can be shown of underwater pressure depth under a hovercraft. b/r jia |
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