95 lines
2.8 KiB
C++
95 lines
2.8 KiB
C++
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#ifndef _SURFACE_HPP
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#define _SURFACE_HPP
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namespace yasim {
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// FIXME: need a "chord" member for calculating moments. Generic
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// forces act at the center, but "pre-stall" lift acts towards the
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// front, and flaps act (in both lift and drag) toward the back.
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class Surface
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{
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public:
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Surface();
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// Position of this surface in local coords
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void setPosition(float* p);
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void getPosition(float* out);
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// Distance scale along the X axis
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void setChord(float chord);
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// Slats act to move the stall peak by the specified angle, and
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// increase drag by the multiplier specified.
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void setSlatParams(float stallDelta, float dragPenalty);
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// Flaps add to lift coefficient, and multiply drag.
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void setFlapParams(float liftAdd, float dragPenalty);
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// Spoilers reduce the pre-stall lift, and multiply drag.
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void setSpoilerParams(float liftPenalty, float dragPenalty);
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// Positions for the controls, in the range [0:1]. [-1:1] for
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// flaps, with positive meaning "force goes towards positive Z"
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void setFlap(float pos);
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void setSlat(float pos);
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void setSpoiler(float pos);
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// local -> Surface coords
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void setOrientation(float* o);
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// For variable-incidence control surfaces. The angle is a
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// negative rotation about the surface's Y axis, in radians, so
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// positive is "up" (i.e. "positive AoA")
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void setIncidence(float angle);
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void setTotalDrag(float c0);
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float getTotalDrag();
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void setXDrag(float cx);
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void setYDrag(float cy);
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void setZDrag(float cz);
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// zero-alpha Z drag ("camber") specified as a fraction of cz
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void setBaseZDrag(float cz0);
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// i: 0 == forward, 1 == backwards
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void setStallPeak(int i, float peak);
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// i: 0 == fwd/+z, 1 == fwd/-z, 2 == rev/+z, 3 == rev/-z
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void setStall(int i, float alpha);
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void setStallWidth(int i, float width);
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void calcForce(float* v, float rho, float* forceOut, float* torqueOut);
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private:
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float stallFunc(float* v);
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float controlDrag();
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float _chord; // X-axis size
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float _c0; // total force coefficient
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float _cx; // X-axis force coefficient
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float _cy; // Y-axis force coefficient
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float _cz; // Z-axis force coefficient
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float _cz0; // Z-axis force offset
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float _peaks[2]; // Stall peak coefficients (fwd, back)
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float _stalls[4]; // Stall angles (fwd/back, pos/neg)
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float _widths[4]; // Stall widths " "
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float _pos[3]; // position in local coords
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float _orient[9]; // local->surface orthonormal matrix
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float _slatAlpha;
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float _slatDrag;
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float _flapLift;
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float _flapDrag;
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float _spoilerLift;
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float _spoilerDrag;
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float _slatPos;
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float _flapPos;
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float _spoilerPos;
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float _incidence;
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};
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}; // namespace yasim
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#endif // _SURFACE_HPP
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