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Maik: Use exact calculation instead of 1st order approximation

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andy 2007-07-31 15:51:04 +00:00
parent acaf611495
commit bf02d9bdd0
1 changed files with 1 additions and 10 deletions
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11
src/FDM/YASim/Rotorpart.cpp
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@ -449,22 +449,13 @@ float Rotorpart::calculateAlpha(float* v_rel_air, float rho,
//angle between blade movement caused by rotor-rotation and the //angle between blade movement caused by rotor-rotation and the
//total movement of the blade //total movement of the blade
/* the next shold look like this, but this is the inner loop of
the rotor simulation. For small angles (and we hav only small
angles) the first order approximation works well
lift_moment += r*(lift * Math::cos(angle) lift_moment += r*(lift * Math::cos(angle)
- drag * Math::sin(angle)); - drag * Math::sin(angle));
*torque += r*(drag * Math::cos(angle) *torque += r*(drag * Math::cos(angle)
+ lift * Math::sin(angle)); + lift * Math::sin(angle));
*/
lift_moment += r*(lift * (1-angle*angle)
- drag * angle);
*torque += r*(drag * (1-angle*angle)
+ lift * angle);
if (returnlift!=NULL) *returnlift+=lift; if (returnlift!=NULL) *returnlift+=lift;
} }
//as above, use 1st order approximation //use 1st order approximation for alpha
//float alpha=Math::atan2(lift_moment,_centripetalforce * _len); //float alpha=Math::atan2(lift_moment,_centripetalforce * _len);
float alpha; float alpha;
if (_shared_flap_hinge) if (_shared_flap_hinge)