Computer-Aided Design of Bicycles

1991 ◽  
Author(s):  
M. Khosrowjerdi ◽  
Robert C. Azar ◽  
Ali Salehi ◽  
G. H. Nazari
Keyword(s):  
Computer Aided Design ◽  
Post Processing ◽  
Finite Element Program ◽  
Analysis And Design ◽  
Design Engineers ◽  
Pertinent Data ◽  
Computer Aided ◽  
Element Program ◽  
Analysis System ◽  
Aided Design

Abstract Traditional manual designing of bicycles often relies on prototype building and testing and since structural deficiencies often are not obvious until a prototype fails, several build-and-test iterations are usually required before a satisfactory design is obtained. Also, the final design may be less than optimal because of quick fixes inserted at the last minute. However, by utilizing computer-aided design, better bicycles can be designed at smaller investments of time and money. The development and utilization of a DI-3000 based (graphics subroutines developed by Precision Visual), user-friendly, self contained computer aided design package for the analysis and design of bicycle frames and forks are presented. The software, written in Fortran 77 and executable on most passive and active graphics devices, creates the necessary analysis input files for the ANSYS finite element program (developed and marketed by Swanson Analysis System Inc.). These pre and post processing files in conjunction with the ANSYS program are used to determine deflections and stress components. The graphics user interface module of the software allows users to enter bicycle geometry, loading and other pertinent data quickly and efficiently. Tubing configuration and specifications are selected from a data base through the use of cursor-controlled menus. The loading menu presents users with seven different types of realistic and self-consistent loading conditions from which to choose. Computer graphics is also used extensively wherever appropriate to enhance user-computer interaction. Contrasting color and text size are used to explain pictorially as well as visually unfamiliar terminology and to clarify vague sign or orientation conventions, thus, leading to more accurate input. While this package has been designed for instructional purposes, it can also be used by design engineers involved in the design of bicycles to facilitate the creation of ANSYS pre and post processing files.

scholarly journals Making a Mesh of Things

2003 ◽  
Vol 125 (09) ◽  
pp. 54-56 ◽  
Author(s):  
Jean Thilmany
Keyword(s):  
Finite Element Analysis ◽  
Computer Aided Design ◽  
Element Analysis ◽  
Entry Level ◽  
Design Engineers ◽  
Computer Aided ◽  
Analysis System ◽  
Aided Design ◽  
Common User ◽  
Load Conditions

Models need to be meshed and made acceptable for analysis before finite element analysis (FEA) can be run. Software providers that make pre-processing applications must keep up with changes in FEA technology to remain competitive. The mesh contains the data on material and structural properties that define how the part will react to certain load conditions. Today's closely integrated computer-aided design (CAD), pre-processing, and FEA applications allow CAD and entry-level FEA technologies to work together within a common user interface and give design engineers a quick, effortless way to see if their designs will meet specifications. Simplifying the FEA programs so a design engineer can use them limits the intricacy of the mesh as well as the depth of analysis. HyperMesh prepares CAD geometries for analysis. The meshed geometries are then exported to Procter & Gamble's customized package analysis system called Virtual Package Simulation. Today, engineers use mesh technologies and attendant FEA programs for an array of analyses. Some are related to manufacturing, but as often as not they've found their way into other industries.

The Design Of Digital Test Simulator

1992 ◽  
pp. 71-81
Author(s):  
Mohamed Othman ◽  
Bambang Sunaryo Suparjo
Keyword(s):  
Computer Aided Design ◽  
Logic Circuit ◽  
Testability Analysis ◽  
Computer Aided ◽  
Digital Test ◽  
Analysis System ◽  
Aided Design ◽  
Controllability And Observability ◽  
Combinational Logic Circuit ◽  
Pascal Language

Digital Test Simulator is a Computer Aided Design (CAD) tools written in Turbo Pascal language ver. 5.0. It is a gate level simulator to measures the testability values of a combinational logic circuit. It was developed based on the testability analysis system called Computer-Aided MEsurefor LOgic Testability (CAMELOT). The measurement of the testability, controllability and observability for every nodes are based on the topologyical description of the circuit. The final results produced by simulator can be expressed in the form of table and histogram. Comparison of the various nodal testability values allows the areas of poor testability to be readily identified and the inprovement can be done to the circuits to make it more testable. Key Words: Logic circuit; Computer-Aided Design; CAMELOT approach; Digital Test Simulator

scholarly journals Modelling of Nonuniform RC Structures for Computer Aided Design

1994 ◽  
Vol 16 (2) ◽  
pp. 89-95
Author(s):  
Muhammad Taher Abuelma'atti
Keyword(s):  
Simple Model ◽  
Computer Aided Design ◽  
Rc Structures ◽  
Analysis And Design ◽  
Hyperbolic Sine ◽  
Hyperbolic Cosine ◽  
Computer Aided Analysis ◽  
Computer Aided ◽  
Aided Design

A simple model for nonuniform distributed RC structures is presented. The model consists of three passive elements only and can be used for modelling nonuniform distributed RC structures involving exponential, hyperbolic sine squared, hyperbolic cosine squared and square taper geometries. The model can be easily implemented for computer-aided analysis and design of circuits and systems comprising nonuniform distributed RC structures.

scholarly journals A Focus On Use

2008 ◽  
Vol 130 (02) ◽  
pp. 28-33 ◽  
Author(s):  
Jean Thilmany
Keyword(s):  
Product Development ◽  
Rapid Prototyping ◽  
Computer Aided Design ◽  
Vice President ◽  
Cad Systems ◽  
Design Engineers ◽  
Computer Aided ◽  
Industrial Designers ◽  
Aided Design

This article analyses the need and benefit of the working of industrial designers and product engineers together. According to engineers and others at the forefront of product development, to do the job right requires a collaboration involving design engineers, industrial designers, manufacturing engineers, and several other players, like marketing people, all of whom have important knowledge that needs to influence a design. Companies such as Trek Bicycle Corp. and Empire Level Manufacturing Corp. have developed practices that foster innovative, human-centered product development. Experts agree that computer-aided design (CAD) and rapid prototyping applications are the two most helpful systems, even though the two types of designers may use the tools in somewhat several ways. According to Rainer Gawlick, vice president of marketing at SolidWorks in Concord, Massachusetts, current CAD systems can help bridge the design-to-engineering-to-manufacturing gap.

Logical Connectives for a CAD Query Language: Algorithms and Verification

2004 ◽  
Author(s):  
Ameya Divekar ◽  
Joshua D. Summers
Keyword(s):  
Computer Aided Design ◽  
Query Language ◽  
Test Cases ◽  
Geometric Information ◽  
Design Engineers ◽  
Modeling Systems ◽  
Computer Aided ◽  
Logical Connectives ◽  
Data Files ◽  
Aided Design

Design engineers create models of design artifacts with commercial Computer Aided Design (CAD) solid modeling systems. These systems stop short of providing support for querying and retrieving data from within the CAD data files. The design exemplar has been proposed as an approach to developing a CAD query language based upon an analysis of the design exemplar components, vocabulary, and extensions to support logical connectives. The implementation of the required extensions is offered in this paper. Algorithms are developed to implement the NOT and OR logical connectives. These algorithms are discussed as they relate to the generic exemplar algorithm. The verification of the algorithms is performed using test cases and comparing the expected results with those found using the software. The design exemplar, supported with the AND, NOT, and OR logical connectives, provides for complex and precise query expression and geometric information retrieval.

scholarly journals Mathematical Modelling and Computer Simulation Assist in Designing Non-traditional Types of Precipitators and Separators

2018 ◽  
Vol 8 (1) ◽  
pp. 441 ◽  
Author(s):  
Milan Bernat ◽  
Jaroslav Džmura ◽  
Renáta Bernátová ◽  
Ľubomr Žáčok ◽  
Jan Pavlovkin
Keyword(s):  
Mathematical Modeling ◽  
Experimental Data ◽  
Computer Simulation ◽  
Computer Aided Design ◽  
Theoretical Calculations ◽  
Electrostatic Separation ◽  
Design Engineers ◽  
Computer Aided ◽  
Aided Design ◽  
Advanced Computer

<p>The article deals with the application of the method for mathematical modeling and simulation at solving some issues in the area of electrostatic technology. It focuses on the processes in electrostatic separation and precipitation. Computer simulation is highly required for equipment design and for their diagnostics in critical operating states using theoretical calculations and experimental data evaluation. The presented computer models may be applied both by project and design engineers using the most advanced computer-aided design of electrostatic technologies.</p>

scholarly journals CAD meets CAE

1999 ◽  
Vol 121 (10) ◽  
pp. 66-69
Author(s):  
Jean Thilmany
Keyword(s):  
Computer Aided Design ◽  
Design Engineers ◽  
Swing Arm ◽  
Computer Aided ◽  
Bicycle Frame ◽  
Current Design ◽  
One Year ◽  
Aided Design ◽  
Cae System ◽  
First Time

This article focuses on engineering developments to integrate computer-aided engineering (CAE) and computer-aided design (CAD) capabilities in a software. CAD/CAE software suites are making their way to the forefront of current design practices, because they contain capabilities that allow designers to build an initial prototype that has already been analyzed by the CAE system for design flaws. Engineers at Cannondale have used an integrated CAD/CAE package to cut one year from the design time of their full-suspension Raven frame, which is both lightweight and stiff and has a suspension fork and a rear swing arm. The CAD software is used to design the bicycle frame while the CAE software immediately analyzes design flaws, which are then corrected, eliminating the need for continual prototyping. Companies are finding that the easy-to-learn nature of these CAD/CAE programs allows them to put analysis capability in the hands of design engineers for the first time.

scholarly journals Three-Level Inverter Control Techniques: Design, Analysis, and Comparisons

2021 ◽  
Vol 27 (3) ◽  
pp. 26-37
Author(s):  
Dan Selisteanu ◽  
Monica Roman ◽  
Lucian Mandache ◽  
Razvan Prejbeanu ◽  
Sergiu Ivanov ◽  
...  
Keyword(s):  
Computer Aided Design ◽  
Asynchronous Motor ◽  
Quality Criteria ◽  
Operating Conditions ◽  
Design Tools ◽  
Analysis And Design ◽  
Control Techniques ◽  
Linear Load ◽  
Computer Aided ◽  
Aided Design

This work addresses the analysis and design of various Proportional-Integral-Derivative (PID) control techniques for a three-level inverter. Multilevel power converters are modern and basic elements of high-voltage electric drive and power supply systems. By using simulations and specific computer-aided design tools, the overall functional characteristics of multilevel converters, as well as the electrical demands of the components, can be accurately assessed to obtain an appropriate control solution. An innovative and detailed software model of a three-level inverter is developed and then used for the implementation of control techniques. Several tuning methods are used to tune PID controllers for two specific cases: the multilevel inverter with a linear load and with an asynchronous motor load, respectively. A detailed analysis and comparisons of the quality criteria and control performance are achieved. This analysis shows that the choice of controller type depends on the inverter load. For the linear load, proper results are obtained with a PI Nichols-tuned controller, and for the asynchronous load, with a PI controller tuned via a modified Hokushin method. The computer-aided design tools can be further used for the simulation of the equipment in various operating conditions, normal and fault, following all functional parameters.

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