29
Jun
MAE 455 Computer-Aided Design and Drafting 2 Types of Curve Equations Implicit Form Explicit Form Parametric Form CAD uses primarily the parametric form. Curve Equations Two types of curve equations 1 Parametric equation.
Select one of each of the AutoCAD or Civil 3D objects that you want to select for example one Mtext object one line one alignment and one parcel.
Types of curves in cad. Non-Uniform Rational B-Splines NURBS are the standard representation of curves and surfaces. They are stable versatile and are excellent at approximating various shapes. NURBS are B-splines with a homogenous coordinate that acts to weight the function.
NURBS are used heavily in most CAD programs such as CATIA. Uniform cubic B-splines are the curves with the parametric intervals defined at equal lengths. The most common scheme used in all the CAD system is the non-uniform rational B-spline commonly known as NURB allowing a non-uniform knot vector.
It includes both the Bézier and B-spline curves. Representation of curves Hermite Curve- Bezier curve B-spline curves-rational curves Techniques for surface modelling Surface patch Coons and bicubic patches Bezier and B-spline surfaces Solid modelling techniques CSG and B-rep UNIT II GEOMETRIC MODELING. Analytic Curves are points lines arcs and circles fillets and chamfers and conics ellipses parabolas and hyperbolas Synthetic curves include various types of splines cubic spline Bcubic spline B-spline Betaspline Beta-spline and Bezierspline and Bezier curves.
Drawing Curves and Solid Fills AutoCad Assignment Help Online AutoCad Homework Autocad Project Help So farin this book youve been using basic lines arcs and circles to create your drawings. Now its time to add polylines and spline curves to your. Curve Equations Two types of curve equations 1 Parametric equation.
OeD 2vnt cn-ruiPo p xu yu. Eca oD 3fntn s-ruiPo p xu y uzu u. Parametric variable and independent variable 2 Nonparametric equation yf.
2-D x z f x y. 3-D Which is better for CADCAE. A plane algebraic curve is a curve formed by the locus of points whose coordinates are the roots of the polynomial in two variables.
A plane algebraic curved line is a path formed by the set of points whose coordinates x and y satisfy Pxy0 where Pxy is a polynomial in two variables. Usually Synthetic curves have some good properties. For instance it is simple to control the stability of the curve to be designed and computation needs are low.
Normally the types of synthetic curves given by major CADCAM systems include following. O Hermite cubic spline. 36 B-Spline Synthetic Curves CADCAM systems have got 3 types of synthetic curves such as Hermite cubic splines Bezier and B-spline curves.
Cubic splines are interpolating curves. Bezier and B-splines are approximating curves. Analytic Curves are points lines arcs and circles fillets and chamfers and conics ellipses parabolas and hyperbolas Synthetic curves include various types of splines cubic spline B-spline Beta-spline and Bezier curves.
Curve Representation All forms of geometric modeling require the ability to define curves. Curves in Modeling Curves produced in modeling systems. Straight lines Conic sections Free-form parametric curves B-Splines NURBS curves of intersection between surfaces defined during model construction Curve Use in Design.
MAE 455 Computer-Aided Design and Drafting 2 Types of Curve Equations Implicit Form Explicit Form Parametric Form CAD uses primarily the parametric form. X2 y2 R2 z 0 yx R2 x2 z 0 xθ Rcos θ yθ Rsin θ zθ 0. To select all instances of a similar type in a drawing.
Enter SELECTSIMILAR on the command line. Select one of each of the AutoCAD or Civil 3D objects that you want to select for example one Mtext object one line one alignment and one parcel. All of the items similar to the object types you selected should now be highlighted.
Datum curves are very useful entities for any kind of 3D CAD packages. In ProE datum curves can even be generated from an equationUnigraphics UG or UGS has many options for creating different types of datum curvesThe two basic types of UGS datum curves and their creation procedures are shown below. There are two categories of curves that can be represented parametrically.
Analytic curves and synthetic curves. Analytic curves are defined as those that can be described by analytic equations such as lines circles and conics. Synthetic curves are the ones that are described by a set of data points.
About Press Copyright Contact us Creators Advertise Developers Terms Privacy Policy Safety How YouTube works Test new features Press Copyright Contact us Creators.