Bicubic ribbon surface
A bicubic ribbon is a surface of constant width extended along the Ox-axis and formed by a set of rectangular bicubic portions connected to each other with smoothness C1 (continuity of gradient between portions) or C2 (continuity of curvature). Each portion is limited by cubic parabolas lying in...
| Main Authors: | , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
Omsk State Technical University, Federal State Autonoumos Educational Institution of Higher Education
2023-06-01
|
| Series: | Омский научный вестник |
| Subjects: | |
| Online Access: | https://www.omgtu.ru/general_information/media_omgtu/journal_of_omsk_research_journal/files/arhiv/2023/%E2%84%962%20(186)%20(%D0%9E%D0%9D%D0%92)/19-27%20%20%D0%9A%D0%BE%D1%80%D0%BE%D1%82%D0%BA%D0%B8%D0%B9%20%D0%92.%20%D0%90.,%20%D0%A3%D1%81%D0%BC%D0%B0%D0%BD%D0%BE%D0%B2%D0%B0%20%D0%95.%20%D0%90..pdf |
| Summary: | A bicubic ribbon is a surface of constant width extended along the Ox-axis
and formed by a set of rectangular bicubic portions connected to each other
with smoothness C1 (continuity of gradient between portions) or C2 (continuity
of curvature). Each portion is limited by cubic parabolas lying in vertical planes
x=const, y=const. The article presents algorithms for calculating a bicubic band
based on the use of boundary curve equations as the main boundary conditions.
The «flat corners» conditions are accepted as additional boundary conditions. The
proposed approach makes it possible to reduce the size of the characteristic matrix
of a system of linear equations with respect to the coefficients included in the
equations of bicubic portions. For example, the calculation of 16 coefficients of
the equation of a bicubic portion passing through fixed boundary curves reduces
to solving a system of four linear equations. Criteria for smooth joining of bicubic
portions are formulated (in the form of theorems). Theorem 1 formulates and
proves the continuity conditions for the gradient. Theorem 2 contains conditions for
the continuity of curvature. Examples of calculation and visualization of C1 and C2-
smooth ribbon surfaces, consisting of two or three bicubic portions, are presented. |
|---|---|
| ISSN: | 1813-8225 2541-7541 |