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convexengineering / SPaircraft

Models for commercial aircraft design
http://spaircraft.readthedocs.org
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Nacelle height and diameter untight in LG for D8.2 #105

Closed 1ozturkbe closed 7 years ago

1ozturkbe commented 7 years ago

Need to investigate...

1ozturkbe commented 7 years ago

Interesting that the weights are still reasonable however.

1ozturkbe commented 7 years ago

Hmmm has to do with no constraint on y_m, so y_m hits y_eng. Problematic constraint:

                    self.LG['d_{nacelle}']  + self.LG['h_{nacelle}'] <= self.LG['l_m'] + (self.VT['y_{eng}']-self.LG['y_m'])*self.LG['\\tan(\\gamma)'], # [SP]
1ozturkbe commented 7 years ago

@bqpd it is interesting that the LHS of the constraint is 1e30, and the RHS is 0, but the constraint is still satisfied... any idea what is going on?

mayork commented 7 years ago

There's nothing to constrain nacelle height in this model. Nacelle is constrained in the LG.

On Oct 2, 2017, at 16:03, Berk Ozturk notifications@github.com wrote:

@bqpd it is interesting that the LHS of the constraint is 1e30, and the RHS is 0, but the constraint is still satisfied... any idea what is going on?

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1ozturkbe commented 7 years ago

I know, but there is something funny mathematically...

1ozturkbe commented 7 years ago

oh no, I totally thought that constraint was within a different boolean (rear_engine). I may be tripping here.

1ozturkbe commented 7 years ago

This was totally silly of me... Closing.