scholarly journals Exacting Standards

2000 ◽  
Vol 122 (12) ◽  
pp. 71-72
Keyword(s):  
North Carolina ◽  
Computer Aided Design ◽  
Point Cloud ◽  
Cloud Data ◽  
Design Concepts ◽  
Research Triangle ◽  
Aided Design ◽  
First Time ◽  
Model Digitizing ◽  
Polygonal Model

This article discusses integration of handcrafted parts into computer-aided design (CAD)-designed bikes. The digital duplication process started when Harley Davidson sent Schaefer an assembly-ready Dyna Wide gas tank. It took two days of work to prepare the tank and scan it with an ATOS white-light 3D scanner, made by GOM mbH (for Gesellschaft fur Optische Messtechnik) in Braunschweig, Germany. Using Geomagic Studio, the software from Raindrop Geomagic, Advanced Design Concepts first converted the point cloud to a polygonal model. The 3D point cloud data were brought into Geomagic Studio, software from Raindrop Geomagic of Research Triangle Park, North Carolina. Using Geomagic, ADC first converted the point cloud to a polygonal model. The next step of processing created a non-uniform rational b–spline (NURBS) model. Digitizing the Dyna Wide gas tank represented the first time that Advanced Design Concepts had used Geomagic Studio on a Harley-Davidson job. According to an expert, the company now has three people devoted to working with the program.

scholarly journals Hybrid approach for alignment of a pre-processed three-dimensional point cloud, video, and CAD model using partial point cloud in retrofitting applications

2018 ◽  
Vol 14 (3) ◽  
pp. 155014771876645 ◽  
Author(s):  
Ashok Kumar Patil ◽  
G Ajay Kumar ◽  
Tae-Hyoung Kim ◽  
Young Ho Chai
Keyword(s):  
Computer Aided Design ◽  
Point Cloud ◽  
Hybrid Approach ◽  
Three Dimensional ◽  
Laser Scanner ◽  
Point Cloud Data ◽  
Cloud Data ◽  
Video Scene ◽  
Engineering Models ◽  
Aided Design

Acquiring the three-dimensional point cloud data of a scene using a laser scanner and the alignment of the point cloud data within a real-time video environment view of a camera is a very new concept and is an efficient method for constructing, monitoring, and retrofitting complex engineering models in heavy industrial plants. This article presents a novel prototype framework for virtual retrofitting applications. The workflow includes an efficient 4-in-1 alignment, beginning with the coordination of pre-processed three-dimensional point cloud data using a partial point cloud from LiDAR and alignment of the pre-processed point cloud within the video scene using a frame-by-frame registering method. Finally, the proposed approach can be utilized in pre-retrofitting applications by pre-generated three-dimensional computer-aided design models virtually retrofitted with the help of a synchronized point cloud, and a video scene is efficiently visualized using a wearable virtual reality device. The prototype method is demonstrated in a real-world setting, using the partial point cloud from LiDAR, pre-processed point cloud data, and video from a two-dimensional camera.

Eine auf Randpunkten basierte hierarchische Spline Parametrisierung für zwei- und dreidimensionale Strukturen/A hierarchical spline parametrization method for solid structures from boundary point-cloud data

Bauingenieur ◽  
2017 ◽  
Vol 92 (05) ◽  
pp. 191-199
Author(s):  
T. Rabczuk ◽  
C. Anitescu ◽  
C. L. Chan
Keyword(s):  
Boundary Point ◽  
Computer Aided Design ◽  
Point Cloud ◽  
Point Cloud Data ◽  
Cloud Data ◽  
Parametrization Method ◽  
Quad Tree ◽  
Computer Aided ◽  
Aided Design

Es wird ein Verfahren zur Diskretisierung aus Oberflächenrepräsentierung gewonnener zwei- und drei dimensionaler Modelle vorgeschlagen. Das Verfahren basiert auf einer hierarchischen Quad-Tree-(2D) oder Octree-(3D) Struktur, um die Oberflächendetails ohne signifikante Erhöhung der Anzahl innerer Elemente effizient darzustellen. Darüber hinaus kann die Oberflächengeometrie präzise in das Modell unter Verwendung kubischer (oder höherer Ordnung) Splines abgebildet werden. Das resultierende Modell verwendet dieselben Basisfunktionen (Bézier-Bernstein-Polynome), die in Computer Aided Design (CAD) Software verwendet werden. Die Methode erlaubt eine generelle Oberflächenrepresäntierung aus unterschiedlichen Datenquellen wie bspw. Bilddaten, Daten von 3D-Scannern und B-Rep-Modellen und minimiert Benutzerinterventionen zur Generierung und Vernetzung volumetrischer Modelle. Letztendlich wird das Verfahren zur Erstellung komplexer dreidimensionaler Modelle im Bauingenieurwesen angewendet.

scholarly journals The Pavilions at the Alhambra’s Court of the Lions: Graphic Analysis of Muqarnas

2020 ◽  
Vol 12 (16) ◽  
pp. 6556
Author(s):  
Antonio Gámiz-Gordo ◽  
Ignacio Ferrer-Pérez-Blanco ◽  
Juan Francisco Reinoso-Gordo
Keyword(s):  
Computer Aided Design ◽  
Point Cloud ◽  
Laser Scanner ◽  
World Heritage Site ◽  
Architectural Elements ◽  
Heritage Site ◽  
Graphic Analysis ◽  
Aided Design ◽  
First Time

This research documents and graphically analyzes the pavilions muqarnas at the Court of the Lions in the Alhambra in Granada, a World Heritage Site. In order to cast some light on the understanding and preservation of these 14th century architectural elements, after a brief report of historical data on catastrophes and restorations, a novel methodology for the case study based on three complementary graphic analyses is presented here: First, there is a review of outstanding images ranging from the 17th to the 20th centuries; subsequently, new CAD (computer-aided design) drawings from pavilions muqarnas testing the theoretic principles from their geometric grouping are accomplished for the first time; and finally, a 3D laser scanner is used to understand the precise present-day state from the point cloud obtained. Comparing drawings allows us to assess the muqarnas relevance while proving, for the first time, that the muqarnas of both pavilions have distinct configurations and different amounts of pieces. Besides, this process reveals geometric deformations existing in the original Nasrid muqarnas compositions, identifying small pieces hitherto unknown, plus additional deformations resulting from adjustments after important threats that both pavilions and their muqarnas overcame for centuries, despite their fragile construction.

scholarly journals On-Site 4-in-1 Alignment: Visualization and Interactive CAD Model Retrofitting Using UAV, LiDAR’s Point Cloud Data, and Video

Sensors ◽  
2019 ◽  
Vol 19 (18) ◽  
pp. 3908 ◽  
Author(s):  
Pavan Kumar B. N. ◽  
Ashok Kumar Patil ◽  
Chethana B. ◽  
Young Ho Chai
Keyword(s):  
Computer Aided Design ◽  
Point Cloud ◽  
Laser Scanner ◽  
Video Frame ◽  
Cad Model ◽  
Point Cloud Data ◽  
Registration Method ◽  
Industrial Facilities ◽  
Cloud Data ◽  
Generic Framework

Acquisition of 3D point cloud data (PCD) using a laser scanner and aligning it with a video frame is a new approach that is efficient for retrofitting comprehensive objects in heavy pipeline industrial facilities. This work contributes a generic framework for interactive retrofitting in a virtual environment and an unmanned aerial vehicle (UAV)-based sensory setup design to acquire PCD. The framework adopts a 4-in-1 alignment using a point cloud registration algorithm for a pre-processed PCD alignment with the partial PCD, and frame-by-frame registration method for video alignment. This work also proposes a virtual interactive retrofitting framework that uses pre-defined 3D computer-aided design models (CAD) with a customized graphical user interface (GUI) and visualization of a 4-in-1 aligned video scene from a UAV camera in a desktop environment. Trials were carried out using the proposed framework in a real environment at a water treatment facility. A qualitative and quantitative study was conducted to evaluate the performance of the proposed generic framework from participants by adopting the appropriate questionnaire and retrofitting task-oriented experiment. Overall, it was found that the proposed framework could be a solution for interactive 3D CAD model retrofitting on a combination of UAV sensory setup-acquired PCD and real-time video from the camera in heavy industrial facilities.

scholarly journals Digital design and parameters optimization for plasmonic circuits

2019 ◽  
Vol 220 ◽  
pp. 03025
Author(s):  
Alexander Shesterikov ◽  
Andrey Leksin ◽  
Alexei Prokhorov
Keyword(s):  
Quantum Dots ◽  
Computer Aided Design ◽  
Surface Plasmon Polariton ◽  
Parameters Optimization ◽  
Digital Design ◽  
Plasmonic Waveguides ◽  
Full Field ◽  
Graphene Layers ◽  
Aided Design ◽  
First Time

The mathematical models for the CAD-platform of plasmonic circuits design have been developed. This platform provides the efficient framework for computer-aided design of semiconductor quantum dots and full-field electromagnetic simulation of surface plasmon-polariton propagation in plasmonic waveguides. The topology of an all-plasmonic devices based on graphene layers and quantum dots is proposed for the first time.

The Development and Research of the Three-Dimensional Simulation System of the Garments CAD

2012 ◽  
Vol 155-156 ◽  
pp. 157-161
Author(s):  
Li Na Yang
Keyword(s):  
Graphic Design ◽  
Computer Aided Design ◽  
Rapid Development ◽  
Three Dimensional ◽  
Simulation System ◽  
The Sustainable Development ◽  
Design Concepts ◽  
Dimensional Simulation ◽  
Aided Design ◽  
2D To 3D

The development and research of three-dimensional (3D) simulation system of the garments CAD (Computer Aided Design) will change the traditional graphic design concepts and design methods, which will develop from two-dimensional (2D) to 3D. It means to build a comprehensive calculating methodology for forming real garments simulation system on the computer. Combining with the advanced CAD technology and technical works of Chinese garments industry will greatly improve the level of the sustainable development and intelligentialization of the software, and will accelerate the technical upgrade of modern garments industry and push the rapid development of national economy.

Representing analogies to influence fixation and creativity: A study comparing computer-aided design, photographs, and sketches

2015 ◽  
Vol 29 (2) ◽  
pp. 161-171 ◽  
Author(s):  
Olufunmilola Atilola ◽  
Julie Linsey
Keyword(s):  
Computer Aided Design ◽  
Idea Generation ◽  
Generation Process ◽  
Critical Question ◽  
Design Fixation ◽  
Design Concepts ◽  
Computer Aided ◽  
Aided Design ◽  
Effective Design

AbstractMany tools are being developed to assist designers in retrieving analogies. One critical question these designers face is how these analogues should be represented in order to minimize design fixation and maximize idea generation. To address this question, an experiment is presented that compares various representations' influence on creativity and design fixation. This experiment presents an effective example (analogue) as computer-aided design (CAD), sketch, or photograph representations. We found that all representations induced fixation, and the degree of fixation did not vary significantly. We also found that CAD representations encourage engineering designers to identify and copy the key effective features of the example. CAD and photo representations also produced a higher quality of design concepts. Results from this experiment offer insights into how these various representations may be used in examples during idea generation; CAD representations appear to offer the greatest advantages during the idea generation process. The results from this experiment also indicate that analogical databases of effective design examples should include CAD and photolike images of the analogue rather than sketches.

scholarly journals Analysis of Engineering Accreditation Process and Outcomes: Lessons Learned for Successful First Time Application

2020 ◽  
Vol 19 (9) ◽  
pp. 281-300
Author(s):  
Tahar Ayadat ◽  
Andi Asiz
Keyword(s):  
Computer Aided Design ◽  
The United States ◽  
Accreditation Process ◽  
Lessons Learned ◽  
Engineering Programs ◽  
Engineering Program ◽  
Senior Design ◽  
Program Compliance ◽  
Aided Design ◽  
First Time

The aims of the paper are to share and analyze engineering accreditation experience starting from the preparation through the outcome, and to discuss lessons learned particularly for first-time applicants. Securing accreditation from a well-recognized international body, such as the Accreditation Board for Engineering and Technology (ABET) can indicate quality of an engineering program. To qualify for an accreditation up to six- to seven-year period, an engineering program must meet a set of accreditation standards or criteria. The article is not limited only for new engineering programs outside the United States who are willing to pursue engineering accreditation from ABET, but it is applicable for an existing accredited program who will undergo next accreditation cycle. The authors presented and analyzed detail accreditation experience for a new established Civil Engineering (CE) Program at Prince Mohammad bin Fahd University (PMU) in Saudi Arabia. Although the ABET website provides detail procedure for the accreditation steps, the detail cases experienced by the PMU CE program will enrich knowledge on how to prepare and handle successful international accreditation. The authors also discussed issues raised during the accreditation activities, including program compliance with the nine ABET criteria, and presented key lessons to prepare for a smooth accreditation process. The main significant result of the accreditation exercise about continuous improvement was summarized in term of the curriculum upgrade, including adding another semester for senior design course and offering new sustainability engineering course, and adding computer aided design course at the early semester.

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