The Dynamic Modeling of Flexible Spatial Machine Systems With Clearance Connections

1987 ◽  
Vol 109 (1) ◽  
pp. 87-94 ◽  
Author(s):  
S. Dubowsky ◽  
J. F. Deck ◽  
H. Costello
Keyword(s):  
Finite Element ◽  
Computer Aided Design ◽  
High Performance ◽  
Three Dimensional ◽  
Matrix Modeling ◽  
Computer Aided ◽  
Modeling Techniques ◽  
Design Systems ◽  
Machine Systems ◽  
Aided Design

An effective method is presented for modeling the full three-dimensional dynamics of high performance spatial machine systems, including the vibrations of their links, supporting structure and enclosures, and impacts in their connection clearances. The method combines four-by-four matrix modeling techniques with finite-element techniques. The system’s elements can be described in rich detail, including detailed models of the internal structure of the connections, yet the dynamic calculations are performed efficiently. The method is formulated for implementation on computer-aided design systems. Examples are presented.

Computer Aided Design Of Garments Using Digitized Three-Dimensional Surfaces

1992 ◽  
Vol 206 (3) ◽  
pp. 199-206 ◽  
Author(s):  
J McCartney ◽  
B K Hinds
Keyword(s):  
Computer Aided Design ◽  
Standard Form ◽  
Three Dimensional ◽  
Data Entry ◽  
General Purpose ◽  
Computer Aided ◽  
Offset Surfaces ◽  
Design Systems ◽  
Aided Design

In the apparel field, there is the problem of creating a design with respect to an underlying standard form. Instead of applying general-purpose three-dimensional computer aided design systems to such tasks it is proposed that design can be carried more efficiently with bespoke design systems. These can be targeted to deal with the problems of accurately defining the offset surfaces which comprise the garment. Such a system is introduced and the methods of data entry are discussed. Position on the three-dimensional form is determined using a digitizer tablet and fit with respect to the form is specified by an offset dimension. It is shown that complex garment pieces with variable fit can be quickly specified within the system.

New Computer Aided Design, Finite Element Modelling and Three-Dimensional Measuring of Rear Screen Creep Forming

1995 ◽  
Vol 209 (2) ◽  
pp. 137-143 ◽  
Author(s):  
D Lochegnies ◽  
E François ◽  
J Oudin
Keyword(s):  
Experimental Data ◽  
Finite Element ◽  
Computer Aided Design ◽  
Finite Element Modelling ◽  
Three Dimensional ◽  
Finite Element Models ◽  
Element Modelling ◽  
Computer Aided ◽  
Analysis Strategy ◽  
Aided Design

A new analysis strategy for creep forming by coupling computer aided design (CAD), finite element models (FEM) and three-dimensional measuring (3D M) with two new CAD/FEM and CAD/3D M interfaces. From the design product via Bézier curves, the manufacturer is now able to predict and adjust creep forming database (initial form of the sheet, geometry of the skeleton, temperature map in the sheet at the furnace exit and forming time) through CAD and FE modules. A reference rear screen manufacture is optimized using the previous strategy and validated with the experimental data through CAD and 3D M modules.

Development and Research of PVT Modules in Computer-Aided Design and Finite Element Analysis Systems

2020 ◽  
pp. 314-342 ◽  
Author(s):  
Vladimir Panchenko ◽  
Valeriy Kharchenko
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Computer Aided Design ◽  
Three Dimensional ◽  
Three Dimensional Model ◽  
Element Analysis ◽  
Computer Aided ◽  
Three Dimensional Models ◽  
Analysis System ◽  
Aided Design

This chapter discusses the simulation of solar photovoltaic thermal modules of planar and concentrator structures in computer-aided design systems KOMPAS 3D and finite element analysis ANSYS. To create photovoltaic thermal modules, a method for designing their three-dimensional models in the computer-aided design system has been developed. To study the thermal regimes of the created three-dimensional models of modules, a method has been developed for visualizing thermal processes, coolant velocity, and flow lines of a cooling agent in a finite element analysis system. As a result of calculations in the finite element analysis system using the developed method, conclusions can be drawn about the feasibility of the design created with its further editing, visualization of thermal fields, and current lines of the radiator cooling agent. As an illustration of the simulation results, a three-dimensional model of a photovoltaic thermal planar roofing panel and an optimized three-dimensional model of a photodetector of a solar concentrator photovoltaic thermal module are presented.

scholarly journals The integration of computer aided design and finite element analysis tools using a logic based approach

2002 ◽  
Author(s):  
◽  
Jason David De Beer
Keyword(s):  
Finite Element ◽  
Computer Aided Design ◽  
Three Dimensional ◽  
Finite Element Models ◽  
Element Analysis ◽  
Computer Aided ◽  
Virtual Prototypes ◽  
Three Dimensional Models ◽  
Aided Design ◽  
Analysis Models

Today's powerful computer-aided engineering (CAE) products have reached ground breaking levels of sophistication when compared with the almost archaic technology used by our predecessors. Engineers are able to develop complex three-dimensional models, or virtual prototypes, using powerful 3D modelling capabilities, and from these models, generate manufacturing drawings, motion analysis models, and even finite element models.

Metal Forming and the Finite-Element Method

1989 ◽  
Author(s):  
Shiro Kobayashi ◽  
Soo-Ik Oh ◽  
Taylan Altan
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Metal Forming ◽  
Computer Aided Design ◽  
The Finite Element Method ◽  
Forming Technology ◽  
Computer Aided ◽  
Deformation Mechanics ◽  
Aided Design ◽  
Element Method

The application of computer-aided design and manufacturing techniques is becoming essential in modern metal-forming technology. Thus process modeling for the determination of deformation mechanics has been a major concern in research . In light of these developments, the finite element method--a technique by which an object is decomposed into pieces and treated as isolated, interacting sections--has steadily assumed increased importance. This volume addresses advances in modern metal-forming technology, computer-aided design and engineering, and the finite element method.

scholarly journals Automatized Evaluation of Students’ CAD Models

2021 ◽  
Vol 11 (4) ◽  
pp. 145
Author(s):  
Nenad Bojcetic ◽  
Filip Valjak ◽  
Dragan Zezelj ◽  
Tomislav Martinec
Keyword(s):  
Computer Aided Design ◽  
Three Dimensional ◽  
Computer Application ◽  
Test Cases ◽  
Cad Model ◽  
Computer Solution ◽  
3D Cad ◽  
Computer Aided ◽  
Cad Models ◽  
Aided Design

The article describes an attempt to address the automatized evaluation of student three-dimensional (3D) computer-aided design (CAD) models. The driving idea was conceptualized under the restraints of the COVID pandemic, driven by the problem of evaluating a large number of student 3D CAD models. The described computer solution can be implemented using any CAD computer application that supports customization. Test cases showed that the proposed solution was valid and could be used to evaluate many students’ 3D CAD models. The computer solution can also be used to help students to better understand how to create a 3D CAD model, thereby complying with the requirements of particular teachers.

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