Adaptive Sampling Strategy for Free-Form Surface Based on CAD Model

He, Gai Yun; Jia, Hanxiang; Guo, Long; Liu, Pei Pei

doi:10.4028/www.scientific.net/amr.542-543.541

Cited by 5 publications

(2 citation statements)

References 5 publications

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“…Various scholars have studied the layouts of measurement points for curves on free-form surfaces. He [9] converted free-form surface sampling into the sampling of multiple curves. Parametric expressions of the curves were obtained by the B-spline interpolation algorithm, and the sampling points were selected according to the curvature magnitude.…”

Section: Introductionmentioning

confidence: 99%

Measurement point layout strategy of free-form surface based on gridding using coordinate measuring machine

Zeng

Chen

2023

Int. J. Metrol. Qual. Eng.

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The layout of measurement points is the key to the efficient inspection of free-form surfaces. Two algorithms are proposed for the layout of free-form surface measurement points: the free-form surface Gaussian curvature variation grid method and the isoparametric line curvature variation grid method. The former first divides the free-form surface into a uniform grid, determines the number of measurement points for each grid based on the change in the Gaussian curvature of each grid, and selects points within each grid based on a uniform distribution of the Gaussian curvature. The latter is achieved by first taking points from the curvature change on the initial U- and V-direction isoparametric lines, generating isoparametric lines from the points to divide the free-form surface into a grid, and selecting the grid intersections as measurement points. The effectiveness of the algorithm was verified by designing free-form surfaces, performing coordinate measuring machine (CMM) measurement experiments, and comparing the results with those of existing algorithms.

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Section: Introductionmentioning

confidence: 99%

Measurement point layout strategy of free-form surface based on gridding using coordinate measuring machine

Zeng

Chen

2023

Int. J. Metrol. Qual. Eng.

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“…Mian [21] studied a method to measure free-form surface by parallel equivalent curvature lines, and Danny [22] achieved a free-form surface measurement with a set of contours in the u or v direction. He [23] proposed a weighted curvature-based method to sample free-form surface in two steps: (1) determine the location of parallel sectional lines by sampling points on the surface boundaries, and (2) sample the sectional lines. Then he improved the algorithm by establishing the nth order mass moment of curve segments, in which the adaptive distribution of the sample points in the curve can be achieved by equally dividing the mass moment [24].…”

Section: Introductionmentioning

confidence: 99%

An adaptive sampling methodology for measuring blades with CMM based on dominant feature points

Guo¹,

Zhang²,

Zou³

et al. 2019

Meas. Sci. Technol.

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Sampling strategy is one of the most critical components of the contact probing process with coordinate measuring machines (CMMs). The number and location of sampling points have direct impacts on the efficiency and reliability of the measurements. Blades of aviation engines have complex geometry and extremely high precision requirements, but the sampling strategy of blades is still a difficult problem which limits the use of CMMs in blade inspection. To balance the measuring efficiency and accuracy of CMM, an adaptive sampling algorithm based on dominant feature points is proposed. In this algorithm, the points are adaptively sampled through a modified B-spline least-square fitting process with dominant feature points and new dominant points if necessary, and the new dominant points are computed by a new method, namely weighted curvature mass moment method. The sections of the blade to be measured are determined with this adaptive sampling algorithm to be the leading and trailing edge curves, and the points on each section to be measured are determined using dominant feature points of the blade profile. The definition and extraction methods for dominant feature points of the blade profile are also researched. By comparing the reconstruction errors of sampling points for several different blades, this adaptive sampling algorithm is proved to be more efficient and accurate than the equal parameter sampling method, equal arc length sampling method, and chord deviation sampling method.

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Research on Robotic Trajectory Automatic Generation Method for Complex Surface Grinding and Polishing

Xie

Yin

2014

Intelligent Robotics and Applications

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Abstract.To solve the problem of high intensity, long time-consuming and low efficiency by on-line programming in robot for free-form surface grinding and polishing, in addition, it isn't programmed by on-line programming in robot for more complex surface. A method of robotic machining trajectory automatic generation for complex surface grinding and polishing is presented, the NonUniform Rational B-splines(NURBS) curve fitting and adaptive sampling algorithm are taken as core of the method, which could realize trajectory planning of robot with off-line programming, Finally, the result of the computer simulations show that the method is simple, effective, practical and reliable. Meanwhile, which could not only generate grinding and polishing trajectory for arbitrary complex surface, but also can improve the quality, precision and efficiency of machining.

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Adaptive Sampling Strategy for Free-Form Surface Based on CAD Model

Cited by 5 publications

References 5 publications

Measurement point layout strategy of free-form surface based on gridding using coordinate measuring machine

Measurement point layout strategy of free-form surface based on gridding using coordinate measuring machine

An adaptive sampling methodology for measuring blades with CMM based on dominant feature points

Research on Robotic Trajectory Automatic Generation Method for Complex Surface Grinding and Polishing

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