Flutter

[Nigel]

I need to determine the effect of adding extra fuel to the wingtips of a Convair 5800 stretch. In particular I need to now how this will affect the flutter characteristics.<br>
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I have the results of a ground vibration test (without the extended fuel tanks)so is the any software out there that will do the aerodynamic analysis? <p>Nigel Waterhouse<br><a href=mailto:nigelw@flightcraf t.ca>nigelw@flightcraf t.ca</a><br><a href=

http://www.flightcraft.ca>Kelowna

Flightcraft</a><br>A licensed aircraft mechanic and a proffessional engineer, who attended university in England and graduated in 1996. Currenty living in British Columbia,Canada and working for Kelowna Flightcraft as a design engineer responsible for aircraft mods and STC

 

[mtnengr]

You could use the component mode sysnthesis method.&nbsp;&nbsp;If there is no change in geomtry, then added mass of the fuel is possible.&nbsp;&nbsp;If you have a change in geomtry, then you use the normal modes obtained from your test and then add a model for the new structure and fluid mass.&nbsp;&nbsp;This has been illustrated in Computers and Stuctures in the 1980s.&nbsp;&nbsp;Also MSC Nastran conference&nbsp;&nbsp;papers are available.&nbsp;&nbsp;If you need specific references, I can look them up for your and transmit them later.

 

[jhosee]

I have very much the same problem you have except the wing span gets larger by 20 %.I've used ZAERO from zone technology to determine the flutter and divergencies speeds .It works perfect and It's integrated with nastran .
if you need help let me know
Good luck
Jhosee