WPMAVM: Weighted plus-and-minus allowance variance minimization algorithm for solving matching distortion

Li, Rui; Liu, Hongdi; Wang, Zhou‐jun; Zhu, Dahu

doi:10.1016/j.rcim.2022.102320

Cited by 10 publications

(1 citation statement)

References 32 publications

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“…the Variance Minimization Matching (VMM)) was theoretically found to have quadratic convergence, and they also demonstrated the same on non-contact scanner measured data. 24 Recently, Lv et al 25 improvised the VMM based method to perform better during measurement noise presence, especially for complex surfaces. Zhu et al 26 showed that heuristic methods like Genetic algorithm (GA) perform better than ICP algorithm during inspection of aero-engine blades (a typical example of a free-form object).…”

Section: Introductionmentioning

confidence: 99%

A Voronoi diagram based framework for fast and accurate evaluation of 2D free-form profile errors

Samuel

2022

Proceedings of the Institution of Mechanical Engineers, Part B:

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Free-form objects which have vast engineering applications are inspected using coordinate measuring machines (CMM) and non-contact scanners. The output from the devices, that is the measured point-set, must be registered with the reference profile and later inspected for the profile error. Registration is accomplished in two phases, that is coarse registration and fine registration. The most crucial step in the fine-registration stage is the profile error estimation at each point of the measured point-set. Generally, this is accomplished using the point-inversion method, which has relatively high time complexity. This work proposes a two-stage framework based on the Voronoi diagram concept for profile error estimation of 2D free-form profiles. A discretized profile is prepared for the measurement process in the first stage. The profile errors are estimated from the measured point-set using the discretized profile in the second stage. Two profile error estimation technique has been proposed based on Voronoi vertices and the Voronoi edges. The effective time-complexity of the proposed framework is O(lm log n). Implementations were executed on simulated NURBS profiles and practically measured CT-scanner data of two machined airfoils modelled as NURBS profiles. The validation results illustrate that the proposed framework’s accuracy is on par with that of the point-inversion method and is at least 56% faster than the latter; thus making it a fast and accurate alternative for CMM (operated in continuous scanning mode), CNC machine-based (in-situ) and vision-based 2D profile inspection.

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Section: Introductionmentioning

confidence: 99%

A Voronoi diagram based framework for fast and accurate evaluation of 2D free-form profile errors

Samuel

2022

Proceedings of the Institution of Mechanical Engineers, Part B:

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Surface quality and cylindricity of ultrasonic elliptical vibration–assisted centerless grinding of micro-rod YAG single crystals

Wang

et al. 2022

Int J Adv Manuf Technol

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Micro-rod YAG single crystals are the most commonly used laser crystals for laser gain mediums with a high power. However, brittle fracture and crack damages are easy to occur in the grinding process of micro-rod brittle crystals due to their large length-to-diameter ratio, high brittleness and high hardness. In this work, the modal, frequency and harmonic response of the transducer under ultrasonic elliptical vibration are analyzed by using nite element simulation. Then, the mechanical structure of ultrasonic elliptical vibration system was designed and optimized based on the ultrasonic elliptical vibration theory and nite element simulation. To verify the reliability of the transducer, ultrasonic vibration experiments were are carried out to measure the resonance frequency, amplitude and impedance characteristics of the transducer. The vibration synthesis experiments under different phase differences and different voltages were performed to verify the rationality of the structural design of the ultrasonic elliptical vibration system. An experimental platform of ultrasonic elliptical vibration assisted centerless grinding was developed, and UEVCG tests of micro-rod YAG crystals were performed. The in uences of voltage, phase difference and pallet angle on surface roughness, PV value and cylindricity of the micro-rod YAG crystals were systematically analyzed. The ultrasonic elliptical vibration parameters were optimized based on the range analysis results of the orthogonal test. The results indicated that ultrasonic elliptical vibration effectively improved the surface quality and cylindricity of the micro-rod YAG crystals compared with traditional grinding. This work will not only enhance the understanding of the ultrasonic elliptical vibration principle, but also provide a technical support for precision and high-e ciency machining of micro-rod brittle materials.

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A technology framework for robotic profiling of blade edges based on model reconstruction and trajectory replanning

Tian

Zhuang

Zhu

2023

Journal of Manufacturing Processes

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WPMAVM: Weighted plus-and-minus allowance variance minimization algorithm for solving matching distortion

Cited by 10 publications

References 32 publications

A Voronoi diagram based framework for fast and accurate evaluation of 2D free-form profile errors

A Voronoi diagram based framework for fast and accurate evaluation of 2D free-form profile errors

Surface quality and cylindricity of ultrasonic elliptical vibration–assisted centerless grinding of micro-rod YAG single crystals

A technology framework for robotic profiling of blade edges based on model reconstruction and trajectory replanning

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