scholarly journals Hybrid Reconstruction and Evaluation of 3D Model of Equipment Parts for Virtual Maintenance System

2021 ◽  
Vol 2068 (1) ◽  
pp. 012037
Author(s):  
Weijun Chu ◽  
Xiangyu Sun
Keyword(s):  
3D Model ◽  
Bevel Gear ◽  
Surface Patch ◽  
Solid Model ◽  
Reconstruction Method ◽  
Original Design ◽  
Reconstruction Process ◽  
General Process ◽  
Maintenance System ◽  
Virtual Maintenance

Abstract The research and application of reverse engineering technology are more and more extensive, but its process is still not fully mature. Aiming at the complexity of equipment parts and the diversity of accuracy requirements, the method of hybrid reconstruction and evaluation of 3D model of equipment parts for virtual maintenance system is illustrated. The general process is given. Taking the two-stage bevel gear worm reducer as the research object, the research on three-dimensional scanning, data processing and model reconstruction is carried out. This paper focuses on the reconstruction process and methods such as regional division, solid model construction based on maximum outer contour, creation of basic surface, patch fitting and so on by taking the bevel gear in the reducer as an example. Finally, 3D comparison, 2D comparison, cross-section accuracy and size of the reconstructed solid model are evaluated. The results show that the hybrid reconstruction method has strong adaptability and high efficiency. Reverse modeling and forward design are organically combined to give full play to their advantages, and the hybrid reconstruction method can effectively reverse the original design intention of the product and improve the parameterization ability of reverse modeling. It can meet the requirements of different precision models developed by virtual maintenance system, structural wall chart and atlas, multimedia and so on.

Parametric Design of Spiral Bevel Gear Based on Pro/E

2012 ◽  
Vol 490-495 ◽  
pp. 2454-2458
Author(s):  
Wei Wang ◽  
Wei Liu ◽  
Yan Chi ◽  
Xiao Mei Cui
Keyword(s):  
3D Model ◽  
Parametric Design ◽  
Bevel Gear ◽  
Spiral Bevel Gear ◽  
Design And Manufacturing ◽  
Basic Parameters ◽  
Base Circle ◽  
Spiral Bevel ◽  
Cutter Head ◽  
The Relationship

Considering the influence of the cutter head plane on manufacturing of spiral bevel gear, the method of 3D model for spiral bevel gear is built based on Program Pro/E. The relationship between the geometric parameters (such as addendum circle, dedendum circle and base circle) and the basic parameters (such as modulus and the number of teeth) of spiral bevel gear is established by using the inner program. The parametric solid model of spiral bevel gear can be obtained automatically by rotation, sweep, blend, and pattern after inputting the basic parameters. This method is significant to improve the accuracy of design and manufacturing of spiral bevel gear.

scholarly journals SAR Observation Error Estimation Based on Maximum Relative Projection Matching

2020 ◽  
Vol 2020 ◽  
pp. 1-14
Author(s):  
Y. Zhang ◽  
B. P. Wang ◽  
Y. Fang ◽  
Z. X. Song
Keyword(s):  
Error Estimation ◽  
Estimation Method ◽  
Estimation Methods ◽  
Estimation Accuracy ◽  
Reconstruction Method ◽  
Observation Error ◽  
Estimation Model ◽  
Reconstruction Process ◽  
Single Observation ◽  
Imaging Results

The existing sparse imaging observation error estimation methods are to usually estimate the error of each observation position by substituting the error parameters into the iterative reconstruction process, which has a huge calculation cost. In this paper, by analysing the relationship between imaging results of single-observation sampling data and error parameters, a SAR observation error estimation method based on maximum relative projection matching is proposed. First, the method estimates the precise position parameters of the reference position by the sparse reconstruction method of joint error parameters. Second, a relative error estimation model is constructed based on the maximum correlation of base-space projection. Finally, the accurate error parameters are estimated by the Broyden–Fletcher–Goldfarb–Shanno method. Simulation and measured data of microwave anechoic chambers show that, compared to the existing methods, the proposed method has higher estimation accuracy, lower noise sensitivity, and higher computational efficiency.

Application of a Novel Virtual Maintenance System: Digital Enterprise Lean Manufacturing Interactive Application-Ergonomics for Integrating Human Factors into Maintenance Processes Design of Carrier-Based Aircraft

2020 ◽  
Vol 17 (7) ◽  
pp. 2962-2967
Author(s):  
Xiao-Feng Chen ◽  
Xi-Gui Wang ◽  
Yong-Mei Wang ◽  
Shu-E Ji ◽  
De-Ling Yang
Keyword(s):  
Lean Manufacturing ◽  
The Novel ◽  
Maintenance System ◽  
Design Cycle ◽  
Technology Applications ◽  
Aircraft Performance ◽  
Interactive Application ◽  
Maintainability Analysis ◽  
Digital Enterprise ◽  
Virtual Maintenance

The novel virtual maintenance system has been used to explain ‘how’ DELMIA-Ergonomics (DE) to go from a reactive, maintenance in security procedures, which will be proactively integrated into every step of the research and development design cycle process. DELMIA software has been widely applied in carrier-based aircraft department as the platform, promotion of virtual prototype pre-maintenance technology in carrier borne design and daily inspection/maintenance is introduced, interactive virtual maintenance flow, the virtual scene structuring, the processes of maintenance simulation of virtual actual working conditions, predictable maintainability analysis/valuation technology based on DELMIA software are expounded. The worldwide trend to popularize gradually increasing use of taking DELMIA software in maintenance technology applications is a carrier-based aircraft for gaining interest. DE has become a means to improve carrier-based aircraft performance.

Material Surface Reconstruction Based on Light Projection

2010 ◽  
Vol 143-144 ◽  
pp. 768-772
Author(s):  
Shao Yan Gai ◽  
Fei Peng Da
Keyword(s):  
Surface Reconstruction ◽  
Three Dimensional ◽  
Shape Reconstruction ◽  
Material Surface ◽  
Reconstruction Method ◽  
Object Surface ◽  
Reconstruction Process ◽  
Dimensional Shape ◽  
Three Dimensional Shape ◽  
Vision Geometry

A surface reconstruction method for material shape analysis is presented. The three-dimensional shape reconstruction system detects object surface based on optical principle. A series of gratings are projected to the object, and the projected gratings are deformed by the object surface. From images of the deformed gratings, three-dimensional profile of the material surface can be obtained. The basic aspects of the method are discussed, including the vision geometry, the light projection and code principle. The proposed method can deal with objects with various discontinuities on the material surface, thus increasing the flexibility and robustness of shape reconstruction process. The experimental results show the efficiency of the method, the material surface can be reconstructed with high precision in various applications.

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