Journal of the Korean Society of Manufacturing Process Engineers (한국기계가공학회지)

The Korean Society of Manufacturing Process Engineers (한국기계가공학회)
권호 표지
DOI QR코드

DOI QR Code

Development of Blade Surface Modeling System Using Point Data

점 데이터를 이용한 블레이드 곡면 모델링 시스템 개발

  • Kim, Yeoung-Il (Steam Turbine Design Team, Doosan Heavy Industries & Construction)
  • 김영일 (두산중공업 증기터빈설계팀)
  • Received : 2019.09.15
  • Accepted : 2019.09.30
  • Published : 2019.10.30
Download PDF
⟨ Previous Next ⟩

Abstract

Stationary and rotating blades can be found in a steam turbine generator and the airfoil shapes of these blades can be defined by point data from an aerodynamic design system. The main design process of blades is composed of two steps: first, the blade surface is modeled with the point data; and then, the section data is generated which contains composite curves with line segments and arcs for CAE of the blade. The surface is modeled by a curve-net defined by the point data, which may be extended to obtain the section data to model the blade. This paper presents methods for automating the above-mentioned steps, which have been implemented in the commercial CAD/CAM system, Unigraphics, with API functions written in C-language. Finally, the proposed methods have been applied to model the blade of a steam turbine generator.

Keywords

References

  1. Kim, Y. I., Kim, L. R. and Jun C. S., "Parametric design of a part with free-from surfaces", Journal of Zhejiang of University SCIENCE A, Vol. 7, No. 9, pp. 1530-1534, 2006. https://doi.org/10.1631/jzus.2006.A1530
  2. Kim, Y. I., Kim, D. S. and Jun, C. S., "A CAD/CAM System for Steam Paths of Turbine Generators", Korean Journal of Computational Design and Engineering, Vol. 10, No. 4, pp. 254-261, 2005.
  3. Cotton, K. S., "Evaluation and improving steam turbine performance", Cotton Fact Inc., pp. 37-67, 1993.
  4. Unigraphics, Open/API Reference Guide NX11, EDS, pp. 1-205, 2017.
  5. Choi, B. K. et al., "CAD/CAM System and CNC machining", SciTech, pp. 402-403, 2001.
  6. Jun, C. S., Ju, S. Y. and Jeon, M. G., "$VC^2$ Chord-Length Spline Surface Using Hermite Interpolant", Journal of the Korean Institute of Industrial Engineers, Vol. 20, No. 1, pp. 87-98, 1994.
  7. Lee, J. H. and Lee, C. S., "A Study on Geometric Modeling and Generation of 4-axis NC Data for Single Setup of Small Marine Propeller", Korean Journal of Computational Design and Engineering, Vol. 7, No. 4, pp. 254-261, 2002.
  8. Piegl. L. and Tiller. W., "The NURBS book". Springer-Verlag, pp. 5-35, 1997.
  9. Shetty S. and White PR., "Curvature-continuous extensions for rational B-spline curves and surfaces", Computer-Aided Design, Vol. 23, No. 7, pp. 484-491, 1991. https://doi.org/10.1016/0010-4485(91)90046-Y
  10. Hu. S. M., Tai. C. L. and Zhang. S. H., "An extension algorithm for B-splines by curve unclamping", Computer-Aided Design, Vol. 34, pp. 415-419, 2002. https://doi.org/10.1016/S0010-4485(01)00108-7