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The Technology of the Automobile’s Surface Fairness in Computer Aided Shape Design

Author: RongHui
Tutor: HeYaoHua
School: Wuhan University of Technology
Course: Vehicle Engineering
Keywords: Smoothing theory Energy Optimization
CLC: U462
Type: Master's thesis
Year: 2005
Downloads: 247
Quote: 7
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Abstract


Computer-aided design and application of non-contact 3D scanning technology in the design of automotive styling , not only greatly shorten the development cycle of the car models , but also significantly improve the quality of the design of automotive styling . Not only because of the design of the car body surface fairing is good or bad a certain impact on the car's power and economy , but also affect the manufacturing quality of the body surface . Therefore , the fairing issues in the design of automotive styling is very important to the car body design software development company , and the focus of the study , one of the major car companies . The general procedure is: automotive styling design renderings design - modeling - model validation and modification - the model of the three-dimensional measurement - to build a digital model of the body surface . In this paper, a newly developed miniature electric car model point cloud data obtained by the measurement of three-dimensional scanning , in-depth study to improve the curve , the curve build efficiency and curve and surface fairing theory and algorithms , and some useful explore : ( 1) node insertions and deletions , curve simultaneously with the reduced-order degree elevation to the same parameters as much as possible so that the family of curves . ( 2 ) In order for the Construction of the curve , surface smoothing, on the premise that the curve is continuous and curved continuous . For this condition and algorithm of continuous curves and surfaces were studied. (3) , curve and surface fairing curve, surface smoothing criteria should also meet the requirements of the production process . Based on the guidelines proposed to control the amount of smoothing . (4) proposed an energy optimization calculation method commonly used in car body design on the basis of several curve, surface fairing algorithm , and this algorithm is extended to NURBS . (5 ) slice processing can reduce the amount of data processing surface fairing energy method . The proposed energy minimization algorithm allows the variation of the body surface curvature is more uniform, and the strain energy is smaller, has a good fairing effect .

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CLC: > Transportation > Road transport > Automotive Engineering > Vehicle design and calculation
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