Algorithm to Construct Line-Shaped Feature Point Clouds of Single-Value Ruled Blades for Gas Turbines

Abstract

A lg o rith m to C onstruct L in e -S h a p e d F e a tu re P o in t C louds of S in g le -V a lu e R u le d B la d e s fo r G as T u rb in e sUsing the geometric features of surfaces, we proposed an algorithm to construct line shaped feature point clouds for the reverse design of a blade surface. Blade surfaces in the gas turbines field require high accuracy and have complex shapes. By quickly recog nizing the border of the scattered point clouds of blades, the back-project method was used to extract the ruled generatrix vector. By solving the multi-objective optimization problem of border point clouds, the annealing algorithm was applied to match border point clouds nonrigidly. Equally divided points were constructed based on the point clouds registration results to get inerratic-orderly line-shaped feature point clouds that are beneficial for generating high quality blade surfaces quickly. The proposed algorithm is very effective for dealing with the point clouds of single-value ruled blades. It is also theoretically significant and may be applied for reconstructing the surface of point clouds of single-value ruled blade surfaces. Experiments verify the feasibility of the proposed algorithm.From the geometric continuity of the curved surface, the border features of blade surfaces [11] can be divided into three types:

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