Designing Fair Curves and Surfaces: Shape Quality in by Nickolas S. Sapidis

By Nickolas S. Sapidis

This cutting-edge research of the strategies used for designing curves and surfaces for computer-aided layout purposes specializes in the main that reasonable shapes are continually freed from unessential beneficial properties and are easy in layout. The authors outline equity mathematically, show how newly built curve and floor schemes warrantly equity, and help the consumer in making a choice on and removal form aberrations in a floor version with no destroying the imperative form features of the version. Aesthetic elements of geometric modeling are of important significance in commercial layout and modeling, really within the vehicle and aerospace industries. Any engineer operating in computer-aided layout, computer-aided production, or computer-aided engineering should want to upload this quantity to his or her library. Researchers who've a familiarity with easy strategies in computer-aided photo layout and a few wisdom of differential geometry will locate this e-book a valuable reference.

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Extra resources for Designing Fair Curves and Surfaces: Shape Quality in Geometric Modeling and Computer-Aided Design (Geometric Design Publication)

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In addition, one type of nonlinear inequality constraint is supported. 4 may be specified in the following manner. The user enters a parameter value / [KUl k where the curvature peak is to be located. 5. For proof of concept, it has been coded in a very naive fashion, with gradients and Hessians evaluated by the optimization package using finite differences. Performance in this mode is not impressive. A large case such as the first example in the next section can take tens of seconds on a typical engineering workstation.

To express A", in formulas, we have to distinguish the planar polygons P^ and the spatial polygons P'jd because of the spatial problem of orientation. The same distinction is used in differential geometry where, in the case of space curves, the curvature is delined to be always positive. So we get in the planar case1 with 48 Designing Fair Curves and Surfaces and the sign function sgn() as usual. Finally, in the spatial case, Second, the discrete torsion Tj is defined in the space with help of the angle j3i between the osculating planes through Pj-2, Pj-i, P; and Pj_i, Pj, P7:+i (see Fig.

In this study, we will assume it is a parametric (nonrational) polynomial spline. Furthermore, because the airfoil must be embedded in a wing surface, typically represented as a parametric tensor product polynomial spline, we will also assume that the polynomial degree and knot set have been fixed a priori. (2) Geometrical constraints. In this study, we will consider only linear equality constraints. The curve must pass through prescribed points and/or possess prescribed tangent vectors. Again, because the curve is regarded as embedded in a tensor product spline surface, these constraints will be imposed at specified parameter values.

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