Flute acoustics: measurement, modelling and design - School of ...

CHAPTER 8. SOFTWARE IMPLEMENTATION 110
typedef struct unitcell_str {
Hole hole;
Vector bore;
Map openMatrixMap;
Map closedMatrixMap;
} *UnitCell;
The member matrixMap in Head and members openMatrixMap and closedMatrixMap
in UnitCell are used by the program to store calculated transfer matrices for a particular frequency.
The members upstreamBore and downstreamBore in Head and bore in UnitCell are
linked lists of bore segments (cylinders or truncated cones). The member upstreamFlange in
Head stores the termination condition for the upstream air column. For flutes the upstream
air column is always stopped, so upstreamFlange is equal to -1. For the sake of generality
upstreamFlange is provided as a parameter.
The structure BoreSegment is defined as
typedef struct boresegment_str {
double radius1;
double radius2;
double length;
double c;
double rho;
} *BoreSegment;
where the members c and rho are provided to store the speed of sound and density of air for
the segment. The remaining members are self-explanatory.
The embouchure hole is defined by the structure
typedef struct embouchurehole_str {
double radiusin;
double radiusout;
double length;
double boreRadius;
double c;
double rho;
} *EmbouchureHole;
where radiusin and radiusout are the inside and outside radii of the embouchure hole. Tone
holes are defined by the structure
typedef struct hole_str {
double radius;
double length;
double boreRadius;
Key key;
double c;
double rho;
char* fingering;
} *Hole;