Re: Force instead of lift

Thank you.

 You are right, I meant the <force> clause in the external force section.
Thank you for the links, I will study your work on this issue.

With best regards,
Oleksiy Frolov

> On Friday 30 September 2011 13:43:24 Oleksiy Frolov wrote:
>> Hello
>>
>>  I am trying to simulate the effects of the differential wing lift. Such
>> as single wing stall due to the propwash loss at a low speed, and the
>> effect of the icing on a single wing (which can happen during a deicing
>> failure on that wing). All of these are important aerodynamic effects.
>>
>>  Now, we know we only have one wing in jsbsim currently, not 2. My idea
>> is
>> therefor to try using 2 <force> records to simulate the wings
>> separately,
>> instead of the usual CL record.
>> This however would require some kind of algorithm to define how the
>> force
>> origin moves to overlay with center of lift for each wing, which is
>> probably not an easy task
>>
>>  I was wondering if anyone have tried a similar approach before, and if
>> this problem pechaps has an easier solution ?
>>
>> Thank you
>>
>> regards,
>> Oleksiy Frolov
>
> A better place to ask might be on the JSBSim user list
> JSBSim user questions <[email protected]>
>
> In the aerodynamics section of a JSBSim configuration you are only allowed
> one
> force vector, applied at aerorp, and consisting of lift, drag and side or
> normal, axial and side.  You can also specify the moments for yaw, pitch
> and
> roll.
>
> An alternative is to use the 'external force' section of JSBSim. This
> allows
> you to specify an arbitrary number of forces, each of which can be applied
> at
> separate points on the airframe and can be computed in different axis
> systems.
>
> I've played a little with doing the vertical stabilizer as external forces
> in
> the JSBSim config I did for the Gloster Meteor:
> https://gitorious.org/ron-s-hanger/gloster-meteor
>
> The JSBSim config is here:
> https://gitorious.org/ron-s-hanger/gloster-meteor/blobs/master/gloster-meteor-jsb.xml
> And the systems file that computes the external force is here:
> https://gitorious.org/ron-s-hanger/gloster-meteor/blobs/master/Systems/external_reactions.xml
>
> This was a quick exercise, and I didn't fully validate the trig used to
> compute the axial/normal/side components.
>
> Ron
>
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All of the data generated in your IT infrastructure is seriously valuable.
Why? It contains a definitive record of application performance, security
threats, fraudulent activity, and more. Splunk takes this data and makes
sense of it. IT sense. And common sense.
http://p.sf.net/sfu/splunk-d2dcopy2