Helix Helix Expressions Listed Expressions 國国圆 Number of Turns AI Name Formula Value Units Comm... Pitch 2 mm p0 (HELIX(O)Number of Turns) 5 5 p1 (HELIX(0)Pitch) 6 6 mm Radius■ethod p2 (HELIX(0)Radus) 8 mm ○Use Law Enter Radius Radius 10 mm Length Name Part Navigator mm Turn Direction Formula Name Right Hand 阀鱼·西阅园X Model Views Unused Items ●Left Hand 由￥/Spline Apply Cancel -a@以0 Define Orientation 《 Point Constructor Dependencies Details OK Apply Cancel Parameter Value Expre... =umb..5.000p0=5 pitch 6.00...p1=6 Radius 8.00...p2-8 Shanghai Jiao Tong University
Shanghai Jiao Tong University 16 Helix
Splines -Splines created in Unigraphics are NURBS (Non-Uniform Rational B- Splines). They are created using defining data(points,slope and curvatures) poles or as the result of another operation. Shanghai Jiao Tong University 17
Shanghai Jiao Tong University 17 Splines n Splines created in Unigraphics are NURBS (Non-Uniform Rational B- Splines). n They are created using defining data(points, slope and curvatures), poles or as the result of another operation
Spline Segments Single segment curve Multiple segment curve Single segment splines are an excellent first choice to simple model. Multiple segment splines are used to generate more complex sheet/solid bodies. Shanghai Jiao Tong University 18
Shanghai Jiao Tong University 18 Spline Segments n Single segment curve n Multiple segment curve n Single segment splines are an excellent first choice to simple model. n Multiple segment splines are used to generate more complex sheet/solid bodies
Spline Degree The degree of a spline refers to degree of the polynomial expression that defines it mathematically. ■Y=ax3+bx2+cx+d This equation has a degree of 3. Shanghai Jiao Tong University 19
Shanghai Jiao Tong University 19 Spline Degree n The degree of a spline refers to degree of the polynomial expression that defines it mathematically. n Y=ax 3+bx 2+cx+d This equation has a degree of 3
Spline Degree Single segment spline degree number of points or poles -1 Multiple segment spline degree number of points or poles number of segments Splines can have a minimum degree of 1 and a maximum degree of 24. Shanghai Jiao Tong University 20
Shanghai Jiao Tong University 20 Spline Degree n Single segment spline degree = number of points or poles – 1 n Multiple segment spline degree = number of points or poles – number of segments n Splines can have a minimum degree of 1 and a maximum degree of 24