Research and Practice on New Measuring and Drafting Mode of Mechanical Drawing Based on Reverse Engineering

2012 ◽  
Vol 239-240 ◽  
pp. 645-648 ◽  
Author(s):  
Dong Yang Fang ◽  
Ai Mei Zhang ◽  
Yi Qiu
Keyword(s):  
Reverse Engineering ◽  
Point Cloud ◽  
Teaching Practice ◽  
Geometric Model ◽  
Three Dimensional ◽  
Surface Shape ◽  
Modern Engineering ◽  
Innovative Idea ◽  
Part Surface ◽  
Graphics Processing

New mode of measurement and draft in mechanical drawing based on reverse engineering is presented to reflect the idea of modern engineering design on teaching practice. Traditional measurement tools are replaced by three-dimensional scanner, whereas graphics processing is performed by using CAD technology. The processing includes three steps. Firstly, point cloud of part surface shape is obtained through scanning. Secondly, point cloud images are joined, filtered and latticed in Geomagic, which is application software of CAD. Finally, the processed point cloud is imported into Catia to reconstruct surface and three-dimensional geometric model. An innovative method of measurement and draft is accordingly proposed, which combines teaching and practices and helps to cultivate the innovative idea and abilities of students.

scholarly journals Design and Manufacture of Child Prosthesis for Higher Members Below the Elbow Through Reverse Engineering

2021 ◽  
Author(s):  
E. Pozo ◽  
E. Medina ◽  
A. Pazmiño
Keyword(s):  
Finite Elements ◽  
Reverse Engineering ◽  
Point Cloud ◽  
Geometric Model ◽  
Prosthesis Design ◽  
Design And Manufacture ◽  
Design And Construction

The objective was to build a prosthesis with its elements such as socket, forearm and hand. The prostheses that are below the elbow generated the motivation for the investigation, being an important factor the correct adaptation of the socket to the stump in a personalized way creating an adjustment due to the vacuum that is generated between these elements, without the need to use a harness. For the design and construction of the prosthesis prototype, a Kinect device was used to obtain a point cloud of the geometric model, the alginate for the manufacture of the mold and plaster that is used to obtain the shape of the hand. The result is an individualized prosthesis design built based on the patient's own dimensions and validated using finite elements; with the purpose of making changes and improvements in the design, to have a prosthesis of easy placement and use. Keywords: prosthesis, socket, stump, finite elements, kinect. Resumen El objetivo fue construir una prótesis con sus elementos como son socket, antebrazo y la mano. Las prótesis que estén por debajo del codo genero la motivación de la investigación, siendo un factor importante la correcta adaptación del socket al muñón de forma personalizada creando un ajuste debido al vacío que se genera entre dichos elementos, sin la necesidad de utilizar un arnés. Para el diseño y construcción del prototipo de prótesis, se utilizó un dispositivo Kinect para la obtención de una nube de puntos del modelo geométrico, el alginato para la fabricación del molde y yeso que es utilizado para la obtención de la forma de la mano. Se presenta como resultado un diseño individualizado de prótesis construida en base a las dimensiones propias del paciente y validado mediante elementos finitos; con el propósito de realizar cambios y mejoras en el diseño, para tener una prótesis de fácil colocación y uso. Palabras claves: prótesis, socket, muñón, elementos finitos, kinect.

scholarly journals An Improved Point Cloud Descriptor for Vision Based Robotic Grasping System

Sensors ◽  
2019 ◽  
Vol 19 (10) ◽  
pp. 2225 ◽  
Author(s):  
Fei Wang ◽  
Chen Liang ◽  
Changlei Ru ◽  
Hongtai Cheng
Keyword(s):  
Object Recognition ◽  
Pose Estimation ◽  
Point Cloud ◽  
Recognition Performance ◽  
Three Dimensional ◽  
Surface Shape ◽  
Feature Descriptor ◽  
Depth Sensor ◽  
Data Set ◽  
Direction Component

In this paper, a novel global point cloud descriptor is proposed for reliable object recognition and pose estimation, which can be effectively applied to robot grasping operation. The viewpoint feature histogram (VFH) is widely used in three-dimensional (3D) object recognition and pose estimation in real scene obtained by depth sensor because of its recognition performance and computational efficiency. However, when the object has a mirrored structure, it is often difficult to distinguish the mirrored poses relative to the viewpoint using VFH. In order to solve this difficulty, this study presents an improved feature descriptor named orthogonal viewpoint feature histogram (OVFH), which contains two components: a surface shape component and an improved viewpoint direction component. The improved viewpoint component is calculated by the orthogonal vector of the viewpoint direction, which is obtained based on the reference frame estimated for the entire point cloud. The evaluation of OVFH using a publicly available data set indicates that it enhances the ability to distinguish between mirrored poses while ensuring object recognition performance. The proposed method uses OVFH to recognize and register objects in the database and obtains precise poses by using the iterative closest point (ICP) algorithm. The experimental results show that the proposed approach can be effectively applied to guide the robot to grasp objects with mirrored poses.

Reverse Engineering of Artwork Teacup

2012 ◽  
Vol 490-495 ◽  
pp. 2906-2910
Author(s):  
Jun Feng ◽  
Bo Jiang
Keyword(s):  
Rapid Prototyping ◽  
Reverse Engineering ◽  
Point Cloud ◽  
Three Dimensional ◽  
Laser Scanner

Through the three-dimensional laser scanner (Non-Contact 3D Digitizer), the outline point cloud of the teacup can be obtained, and the reverse engineering such as cutting, aligning, combining, etc. is conducted to the point cloud in the software of RANGE VIEWER and RapidForm XOR, to achieve the three-dimensional diagram, which can be imported to the rapid prototyping machine, to process the teacup sample and complete the reverse engineering of teacup imitation.

Point Cloud Data Acquisition Based on Reverse Engineering Technology

2012 ◽  
Vol 159 ◽  
pp. 186-190 ◽  
Author(s):  
Xian Sheng Ran ◽  
Li Lin ◽  
Han Bing Wei
Keyword(s):  
Reverse Engineering ◽  
Data Acquisition ◽  
Point Cloud ◽  
Three Dimensional ◽  
Point Cloud Data ◽  
Engineering Technology ◽  
Cloud Data ◽  
Cloud Processing ◽  
Optical Scanner ◽  
Point Cloud Processing

A reverse engineering based point cloud data acquisition method is addressed. The most critical part of reverse engineering (RE) is data acquisition of the digital model, the quality of design is determined by point cloud data acquisition, which is related to the accuracy of design. The measurement of relative position of different parts has been a difficulty of data acquisition. In this paper, the ATOS optical scanner was used as an example to illustrate the principle of three-dimensional scanner, the positioning methods and procedure of point cloud processing. A case study of point cloud data acquisition of car body was used to illustrate three-point positioning principle, which improves the accuracy of measurement compare with traditional method.

Modeling and Implementation of 3D Mannequin in Garment CAD

2012 ◽  
Vol 182-183 ◽  
pp. 805-809
Author(s):  
Qing Ma
Keyword(s):  
Reverse Engineering ◽  
Point Cloud ◽  
Characteristic Curve ◽  
Three Dimensional ◽  
Point Cloud Data ◽  
Model Matching ◽  
Model Surface ◽  
Cloud Data ◽  
Model Characteristic ◽  
Body Point

The paper used technology of reverse engineering to process body point cloud data that acquired from three-dimensional (3D) scanning device, so as to rapidly establish 3D mannequin model matching to corresponding bodily form. Based on establishment of static mannequin model, characteristic curve can be dynamically adjusted and mannequin model surface can be reconstructed according to specific requirements of users to generate realistic 3D mannequin model in accordance with the application needs of made-to-measure clothing in garment CAD.

The Reverse Modeling Analysis and Design on Compression Molding Bodies

2014 ◽  
Vol 602-605 ◽  
pp. 155-158
Author(s):  
Hui Fen Lai ◽  
Xiu Min Liu
Keyword(s):  
Point Cloud ◽  
Design Method ◽  
Curve Surface ◽  
Three Dimensional ◽  
Laser Scanner ◽  
Compression Molding ◽  
Surface Shape ◽  
Cloud Data ◽  
Forming Mechanism ◽  
Analysis And Design

To solve the problem it is difficult to accurately measure the curve surface, the forming mechanism of reverse engineering modeling approach is studied. Using the non-contact measurement of laser scanner, the point cloud data of the compression molding bodies is obtained, and it is introduced into the three-dimensional software CATIA to generate 3D model according to the molding processing point cloud and compression molding mechanism. In the last to generate the complete engineering drawings. Comparing the traditional design method, the method is mainly used for 3D parts reconstruction and design in surface shape is difficult to accurately expressed or unknown component shape design methods.

Handheld Laser Scanner Research

2019 ◽  
Vol 952 (10) ◽  
pp. 47-54
Author(s):  
A.V. Komissarov ◽  
A.V. Remizov ◽  
M.M. Shlyakhova ◽  
K.K. Yambaev
Keyword(s):  
Point Cloud ◽  
Three Dimensional ◽  
Laser Scanner ◽  
Test Site ◽  
Optical Systems ◽  
Advantages And Disadvantages ◽  
Site Survey ◽  
Laser Scanners ◽  
Three Dimensional Models ◽  
The Stability

The authors consider hand-held laser scanners, as a new photogrammetric tool for obtaining three-dimensional models of objects. The principle of their work and the newest optical systems based on various sensors measuring the depth of space are described in detail. The method of simultaneous navigation and mapping (SLAM) used for combining single scans into point cloud is outlined. The formulated tasks and methods for performing studies of the DotProduct (USA) hand-held laser scanner DPI?8X based on a test site survey are presented. The accuracy requirements for determining the coordinates of polygon points are given. The essence of the performed experimental research of the DPI?8X scanner is described, including scanning of a test object at various scanner distances, shooting a test polygon from various scanner positions and building point cloud, repeatedly shooting the same area of the polygon to check the stability of the scanner. The data on the assessment of accuracy and analysis of research results are given. Fields of applying hand-held laser scanners, their advantages and disadvantages are identified.

scholarly journals Symmetry Analysis of Oriental Polygonal Pagodas Using 3D Point Clouds for Cultural Heritage

Sensors ◽  
2021 ◽  
Vol 21 (4) ◽  
pp. 1228
Author(s):  
Ting On Chan ◽  
Linyuan Xia ◽  
Yimin Chen ◽  
Wei Lang ◽  
Tingting Chen ◽  
...  
Keyword(s):  
Cultural Heritage ◽  
Unmanned Aerial Vehicle ◽  
Point Cloud ◽  
Geometric Model ◽  
Digital Camera ◽  
Point Clouds ◽  
Symmetry Analysis ◽  
3D Point Clouds ◽  
Transmission Towers ◽  
Aerial Vehicle

Ancient pagodas are usually parts of hot tourist spots in many oriental countries due to their unique historical backgrounds. They are usually polygonal structures comprised by multiple floors, which are separated by eaves. In this paper, we propose a new method to investigate both the rotational and reflectional symmetry of such polygonal pagodas through developing novel geometric models to fit to the 3D point clouds obtained from photogrammetric reconstruction. The geometric model consists of multiple polygonal pyramid/prism models but has a common central axis. The method was verified by four datasets collected by an unmanned aerial vehicle (UAV) and a hand-held digital camera. The results indicate that the models fit accurately to the pagodas’ point clouds. The symmetry was realized by rotating and reflecting the pagodas’ point clouds after a complete leveling of the point cloud was achieved using the estimated central axes. The results show that there are RMSEs of 5.04 cm and 5.20 cm deviated from the perfect (theoretical) rotational and reflectional symmetries, respectively. This concludes that the examined pagodas are highly symmetric, both rotationally and reflectionally. The concept presented in the paper not only work for polygonal pagodas, but it can also be readily transformed and implemented for other applications for other pagoda-like objects such as transmission towers.

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