Digital modelling in aviation and mechanical engineering: 3D-model transformation algorithms for creating new structures

2021 ◽  
Author(s):  
R. R. Anamova ◽  
G. K. Khotina
Keyword(s):  
Model Transformation ◽  
Mechanical Engineering ◽  
3D Model ◽  
Transformation Algorithms ◽  
Digital Modelling

scholarly journals Possibilities of Preoperative Medical Models Made by 3D Printing or Additive Manufacturing

2016 ◽  
Vol 2016 ◽  
pp. 1-6 ◽  
Author(s):  
Mika Salmi
Keyword(s):  
Additive Manufacturing ◽  
3D Printing ◽  
3D Modeling ◽  
Mechanical Engineering ◽  
3D Model ◽  
Model Reconstruction ◽  
3D Model Reconstruction ◽  
Wide Range ◽  
Printing Processes ◽  
Binder Jetting

Most of the 3D printing applications of preoperative models have been focused on dental and craniomaxillofacial area. The purpose of this paper is to demonstrate the possibilities in other application areas and give examples of the current possibilities. The approach was to communicate with the surgeons with different fields about their needs related preoperative models and try to produce preoperative models that satisfy those needs. Ten different kinds of examples of possibilities were selected to be shown in this paper and aspects related imaging, 3D model reconstruction, 3D modeling, and 3D printing were presented. Examples were heart, ankle, backbone, knee, and pelvis with different processes and materials. Software types required were Osirix, 3Data Expert, and Rhinoceros. Different 3D printing processes were binder jetting and material extrusion. This paper presents a wide range of possibilities related to 3D printing of preoperative models. Surgeons should be aware of the new possibilities and in most cases help from mechanical engineering side is needed.

3D Model Transformation of Waveguide Slot Array Antenna in Mechanical-Electromagnetic Analyses

2012 ◽  
Vol 562-564 ◽  
pp. 1487-1491
Author(s):  
Mei Chen ◽  
Fei Zheng ◽  
Na Li
Keyword(s):  
Model Transformation ◽  
3D Model ◽  
Geometric Model ◽  
3D Models ◽  
Transformation Method ◽  
Mechanical Analysis ◽  
Array Antenna ◽  
Waveguide Slot ◽  
Electromagnetic Model ◽  
3D Geometric Model

The mechanical errors in a mobile waveguide slot array antenna will finally influence the electromagnetic performances. Hence it is necessary to understand the relationship between them, which requires mechanical-electromagnetic analyses. The 3D models in both mechanical analysis and electromagnetic analysis are greatly different. They need a precise connection and transformation. The paper proposes an effective 3D model transformation method. From 3D geometric model to 3D mechanical model, and then to 3D electromagnetic model, the precise connection and transformation can be finished. It can be used to increase the analysis precision of a complex waveguide slot array antenna.

scholarly journals REMOTE SENSING DATA AS BASIS FOR THE MODELLING AND REASSEMBLY OF DISMANTLED HERITAGE STRUCTURES

2019 ◽  
Vol XLII-2/W15 ◽  
pp. 1187-1194 ◽  
Author(s):  
S. Vincke ◽  
M. Bassier ◽  
R. de Lima Hernandez ◽  
I. Dejaeghere ◽  
K. Carbonez ◽  
...  
Keyword(s):  
Remote Sensing ◽  
Relative Position ◽  
3D Model ◽  
Remote Sensing Data ◽  
Current Situation ◽  
Built Heritage ◽  
Digital Modelling ◽  
Position And Orientation ◽  
Remote Sensing Techniques ◽  
Over Time

<p><strong>Abstract.</strong> Remote sensing techniques are invaluable for the documentation and preservation of built heritage. The techniques facilitate fast documentation of highly complex heritage structures with improved accuracies. Furthermore they improve the degree of detail substantially. This is extremely useful for the restoration of collapsed elements or the reassembly of dismantled structures. These entities are often challenging to puzzle back together. Moreover, the differential settlements of the elements over time heavily influence the relative position and orientation of the remaining pieces, further complicating the reconstruction. Digital modelling solutions with a 3D model of the current situation as take-off, are desperately needed by the industry to tackle the present obstacles. In this work, a framework is proposed that facilitates a more accurate reassembly of dismantled heritage elements. It consists of three major phases starting with the accurate recording of the current situation as well as the preserved components. Subsequently, the new design is dititally modelled, reducing the necessary time for the reassembly of the structure, which is the last step in the rebuilding workflow. The presented framework allows for an efficient and comprehensible reconstruction of the structure. A key aspect in the approach is the detection of missing components and the estimation of their dimensions for the production of accurate replicas. The potential is showcased by means of two case studies on the reassembly of flying buttresses and rib vaults of the Saint-James church in Leuven, Belgium, which is currently undergoing major stabilisation works. The presented approach allows heritage experts to gain better oversight over their reassembly project and work more efficiently.</p>

Research on STK-Based 3D Model Transformation and Optimization

2020 ◽  
pp. 387-394
Author(s):  
Kunfu Wang ◽  
Wanfeng Mao ◽  
Wei Feng ◽  
Jian Su ◽  
Xing Li ◽  
...  
Keyword(s):  
Model Transformation ◽  
3D Model

Method of extracting design knowledge from 3D models

2021 ◽  
pp. 55-56
Author(s):  
Keyword(s):  
Mathematical Description ◽  
Mechanical Engineering ◽  
3D Model ◽  
3D Models ◽  
Design Knowledge ◽  
Model Design ◽  
Deformation Method ◽  
Hu Moment

The mathematical description of extracting design knowledge from 3D-models and methods for comparing the obtained knowledge, used in the search for geometrically similar mechanical engineering products, are considered. Keywords: 3D-model, design knowledge, deformation method, Hu-moment, convolutional neural [email protected]

scholarly journals Line Width Recovery after Vectorization of Engineering Drawings

2016 ◽  
Vol 24 (39) ◽  
pp. 43-50
Author(s):  
Matúš Gramblička ◽  
Jozef Vaský
Keyword(s):  
Line Width ◽  
Mechanical Engineering ◽  
3D Model ◽  
Semantic Information ◽  
Line Length ◽  
Variable Number ◽  
Vector Representation ◽  
Software Applications ◽  
Raster Image ◽  
Engineering Drawings

Abstract Vectorization is the conversion process of a raster image representation into a vector representation. The contemporary commercial vectorization software applications do not provide sufficiently high quality outputs for such images as do mechanical engineering drawings. Line width preservation is one of the problems. There are applications which need to know the line width after vectorization because this line attribute carries the important semantic information for the next 3D model generation. This article describes the algorithm that is able to recover line width of individual lines in the vectorized engineering drawings. Two approaches are proposed, one examines the line width at three points, whereas the second uses a variable number of points depending on the line length. The algorithm is tested on real mechanical engineering drawings.

3D Mechanical Models Retrieval Based on Combined Histograms for Rapid Product Design

2009 ◽  
Vol 16-19 ◽  
pp. 65-69
Author(s):  
Hui Jing ◽  
Mei Fa Huang ◽  
Cong Li
Keyword(s):  
Product Design ◽  
Mechanical Model ◽  
Mechanical Engineering ◽  
3D Model ◽  
New Method ◽  
Model Design ◽  
Retrieval Process ◽  
Shape Distribution ◽  
Mechanical Models ◽  
Very High

Shape Distribution (3DSD) and Radius Angle Histogram (RAH) are useful methods for retrieving 3D model in mechanical engineering. Through these methods have advantages such as fast speeds and simple operations, the retrieval precision are not very high enough. To improve the retrieval precision, a new method named combined histograms which integrates the advantages of 3DSD and RAH is proposed. This method makes use of the information both of shape and surface of the models to be retrieved. In the retrieval process, the shape histogram and the radius angle histogram of the retrieved model are first extracted. Then, the combined histograms of the model are established by integrating the shape histogram and the radius angle histogram. To validate the proposed method, an experiment is given. The experiment results show that the proposed method has higher retrieval precision than that of 3DSD and RAH and is suitable for mechanical model design.

The Method and Technique of 2D Drawing Creation Based on NX7.5

2012 ◽  
Vol 157-158 ◽  
pp. 119-122
Author(s):  
Xiang Hui Zhan ◽  
Xiao Da Li
Keyword(s):  
Model Transformation ◽  
3D Model ◽  
Engineering Drawing ◽  
Engineering Graphics ◽  
Simple Operation ◽  
Key Points ◽  
Master Model ◽  
Drawing Frame ◽  
2D Drawing

The method and technique of the 3D model transformation for 2D engineering drawing using NX7.5 was studied. The key points of GC china toolkits, method of master model and pattern were introduced. The GC china toolkits produced convenient way to custom drawing standard to match China standard through some simple operation. The method of master model realized the relativity between 3D model and 2D drawing. The pattern was an effective method to add drawing frame and title bar to sheets. In the end, the process of 2D engineering graphics creation was expatiated. The practice case proves that the drawing efficiency is improved greatly by NX7.5 application.

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