Computer Aided Bearing Design and Analysis

2002 ◽  
Author(s):  
Edward M. Vavrek
Keyword(s):  
Visual Basic ◽  
The Other ◽  
Spur Gears ◽  
Belt Drives ◽  
Computer Aided ◽  
Machine Elements ◽  
Design Students ◽  
Bearing Design

I have written a program using visual basic called Bearing Design. Students in a machine elements course will use the program to size and select bearings. The program is written to aid students in the understanding of bearing design. The program is part of a series of programs used to assist the students in learning how to design and select machine components. Some of the other programs used are Designing Spur Gears and Sizing Belt Drives Components.

Computer-Aided Power Requirements

2003 ◽  
Author(s):  
Edward M. Vavrek
Keyword(s):  
Design Process ◽  
Decision Process ◽  
Selection Process ◽  
Power Requirement ◽  
Belt Drives ◽  
Computer Aided ◽  
Software Program ◽  
Machine Elements ◽  
Selection Of

The power requirement of machinery is a necessary consideration for the sizing and selection of machine elements in the design process. The decision process of designing gears, belt drives, clutches, brakes, and bearings are designed and sized based on the power requirement of the application. I have written a software program that calculates the power requirements for three different design applications. This software program simplifies and streamlines the design and selection process by allowing the student to calculate the horsepower and torque requirement.

scholarly journals Conversion Between Cubic Bezier Curves and Catmull–Rom Splines

2021 ◽  
Vol 2 (5) ◽  
Author(s):  
Soroosh Tayebi Arasteh ◽  
Adam Kalisz
Keyword(s):  
Computer Graphics ◽  
Geometric Design ◽  
The Other ◽  
Control Points ◽  
Complex Surfaces ◽  
Linear Transformations ◽  
Computer Aided Geometric Design ◽  
Cubic Curves ◽  
Original Curve ◽  
Computer Aided

AbstractSplines are one of the main methods of mathematically representing complicated shapes, which have become the primary technique in the fields of Computer Graphics (CG) and Computer-Aided Geometric Design (CAGD) for modeling complex surfaces. Among all, Bézier and Catmull–Rom splines are the most common in the sub-fields of engineering. In this paper, we focus on conversion between cubic Bézier and Catmull–Rom curve segments, rather than going through their properties. By deriving the conversion equations, we aim at converting the original set of the control points of either of the Catmull–Rom or Bézier cubic curves to a new set of control points, which corresponds to approximately the same shape as the original curve, when considered as the set of the control points of the other curve. Due to providing simple linear transformations of control points, the method is very simple, efficient, and easy to implement, which is further validated in this paper using some numerical and visual examples.

Automated Design of Optimum Belt Drives

1991 ◽  
Author(s):  
Dipendra K. Sinha ◽  
Michael T. McDonald
Keyword(s):  
Computer Aided Design ◽  
Database Management ◽  
Relevant Information ◽  
Automated Design ◽  
Drive System ◽  
Management Systems ◽  
Belt Drives ◽  
Computer Aided ◽  
Aided Design ◽  
Selection Of

Abstract The paper describes a belt design package which works from within a commercial Computer Aided Design and Drafting package (AutoCAD) environment and utilizes FORTRAN programs for design and selection of lowest weight components for the drive system. The components used in the process are available as stock items in U.S.A. The relevant information on these products is stored in commercial database management systems such as EXCEL and LOTUS 1-2-3. Output from the package consists of scaled drawing and tabular specifications.

Modelling and Analysis of Web-Based CourseWare Systems

2000 ◽  
pp. 155-173
Author(s):  
Lam Chi-Yung ◽  
Cheung Shing-Chi
Keyword(s):  
Information Structure ◽  
Formal Method ◽  
The Other ◽  
Design Phase ◽  
Web Based ◽  
Case Tools ◽  
Computer Aided ◽  
Dynamic Components ◽  
The One ◽  
Computer Aided Software Engineering

Designing reliable Web-based courseware systems is not trivial. Courseware authors need to allow as much flexibility in navigating through the system as possible on the one hand, and to ensure the satisfaction of properties and constraints in the system on the other. The problem is aggravated with facilities like Java applets which incorporate dynamic behaviour into the information structure. These issues motivate the need for designing such systems through rigorous modelling and analysis. We propose a scheme using a formal method called the Calculus of Communicating Systems (CCS) to unify the modelling of the courseware based on its navigational structure, semantics and dynamic components. Properties like ordering constraint, reachability and coverage constraint can be answered after a model is extracted from the implementation. Besides, our approach can be extended to assist in the design phase of the construction process, just like what computer-aided software engineering (CASE) tools do. A hypothetical example is used throughout the chapter as an illustration.

Language maintenance in the second generation

1992 ◽  
Vol 15 (1) ◽  
pp. 53-70 ◽  
Author(s):  
E. Jane Bennett
Keyword(s):  
Statistical Analysis ◽  
Positive Attitude ◽  
Second Generation ◽  
Language Maintenance ◽  
Census Data ◽  
The Other ◽  
English Only ◽  
Frequency Of Use ◽  
Computer Aided ◽  
Maintenance Activities

Abstract The article discusses the attitude of the second generation Dutch in Australia to language maintenance. It gives a profile of the group’s language maintenance activities, and examines factors related to language maintenance attitudes and the use of Dutch. The research involved detailed personal interviews with 100 members of the target group. Some of the information collected was evaluated quantitatively using computer-aided statistical analysis; other responses were analysed primarily in qualitative terms. The results revealed a more positive attitude to language maintenance and greater frequency of use of Dutch than might have been expected on the basis of the (limited) previous research on the second generation or the national census data. On the other hand, there was relatively little participation in activities with the potential to influence the use of Dutch: visits to the Netherlands, association with Dutch organizations, and attendance at Dutch classes. Overall the research provided no evidence of a continuing decline in frequency of use of Dutch to the point of a complete shift to English only. It was also clear that many informants valued their current use of Dutch.

Effects of Drive Side Pressure Angle on Gear Fatigue Crack Propagation Life for Spur Gears With Symmetric and Asymmetric Teeth

2019 ◽  
Author(s):  
Fatih Karpat ◽  
Oguz Dogan ◽  
Tufan Yilmaz ◽  
Celalettin Yuce ◽  
Onur Can Kalay ◽  
...  
Keyword(s):  
Fatigue Crack ◽  
Crack Propagation ◽  
Fatigue Crack Propagation ◽  
Tooth Profile ◽  
Spur Gears ◽  
Pressure Angle ◽  
Side Pressure ◽  
Machine Elements ◽  
Fatigue Crack Propagation Life ◽  
Initial Starting

Abstract Today gears are one of the most crucial machine elements in the industry. They are used in every area of the industry. Due to the high performances of the gears, they are also used in aerospace and wind applications. In these areas due to the high torques, unstable conditions, high impact forces, etc. cracks can be seen on the gear surface. During the service life, these cracks can be propagated and gear damages can be seen due to the initial cracks. The aim of this study is to increase the fatigue crack propagation life of the spur gears by using asymmetric tooth profile. Nowadays asymmetric gears have a very important and huge usage area in the industry. In this study, the effects of drive side pressure angle on the fatigue crack propagation life are studied by using the finite element method. The initial starting points of the cracks are defined by static stress analysis. The starting angles of the cracks are defined constant at 45°. The crack propagation analyses are performed in ANSYS SMART Crack-Growth module by using Paris Law. Four different drive side pressure angles (20°-20°, 20°-25°, 20°-30° and 20°-35°) are investigated in this study. As a result of the study the fatigue crack propagation life of the gears is increased dramatically when the drive side pressure angle increase. This results show that the asymmetric tooth profile not only decrease the bending stress but also increase the fatigue crack propagation life strongly.

scholarly journals Design Students’ Theories of Creativity: A Macau Perspective

2016 ◽  
Vol 2 (1) ◽  
pp. 1
Author(s):  
Kuan Chen Tsai
Keyword(s):  
Implicit Theories ◽  
Empirical Studies ◽  
Female Students ◽  
The Other ◽  
Chinese Art ◽  
Creative Work ◽  
Art And Design ◽  
Qualitative Survey ◽  
Convenience Sampling ◽  
Design Students

Explicit theories are constructed by experts based on the findings of empirical studies. Implicit theories, on the other hand, are generated from assumptions and ideas held by non-experts. The purpose of the current study was to examine Chinese art and design undergraduates’ perceptions of creativity. The implicit theories of this concept that are held by art and design students are perhaps disproportionately important, in that they might inform creative work in the real world. The current study was a qualitative survey and utilized convenience sampling to recruit 95 participants, all third-year college students in art and design in Macau. The current study was a qualitative survey, distributed online, and consisting of demographic questions and a single open-ended question: “When you hear the word ‘creativity’, what words come into your mind? We found that the majority of the most popular responses seemed to reflect the creativity literature, with <em>new, unique, surprise, and interesting</em>. In addition, among these four attributes, female students were significantly more concerned that creativity should have <em>new</em> and <em>interesting</em> components than their male counterparts did.

scholarly journals Forward kinematic analysis of a 3-RRRS mechanism with subordinate driving variables using a computer-aided geometric method

2019 ◽  
Vol 16 (4) ◽  
pp. 172988141987066
Author(s):  
Liangwen Wang ◽  
Tuanhui Wang ◽  
Fannian Meng ◽  
Wenliao Du ◽  
Caidong Wang ◽  
...  
Keyword(s):  
Analytical Method ◽  
Kinematic Analysis ◽  
Visual Basic ◽  
Geometric Method ◽  
Kinematics Analysis ◽  
Kinematic Chains ◽  
Computer Aided ◽  
Parameterized Model ◽  
Moving Platform ◽  
Analysis System

The 3-RRRS mechanism (RRRS refers to kinematic pairs of a branched chain consisting of three R pairs (Rotational pairs) and one S pair (Spherical pair), successively) is used between a moving platform and a static platform, through which six-dimensional motion of the moving platform relative to the static platform can be achieved. Selecting six independently drivable joints from nine active joints makes it problematic to deal analytically with the kinematics of the 3-RRRS mechanism. In this article, a novel computer-aided geometric method for kinematic analysis is developed. This method can automatically detect the independently drivable joints for arbitrary kinematic chains. This method can be easily implemented compared to the analytical method of the forward kinematics. Based on the constraint relationship of the 3-RRRS mechanism, a general 3-RRRS mechanism digital model is built in the SolidWorks Application Program Interface embedded Visual Basic environment, in which the platform sizes and active driving angles are driven by the parameterized model, to make the moving platform move to the corresponding pose. After the pose of the moving platform is confirmed, the coordinate system is built in a preliminary sketch. The parameters are measured by the SolidWorks measuring functions, and the pose of the moving platform is obtained by combining homogeneous matrices. Using the computer-aided geometric method, the detailed kinematics formula is not required. The accuracy and efficiency of the computer-aided geometric method were assessed with some examples of kinematic analysis for the 3-RRRS mechanism. The results showed that the proposed method obtained competitive precision and calculation time to the analytical method and is beneficial as a convenient solving process. By using Visual Basic programming, a reachable poses analysis of the mechanism can be merged into the kinematics analysis system of the computer-aided geometric method. The computer-aided geometric method could be widely applied to kinematics analysis of mechanisms.

Computer-Aided Learning Support for Environmental Design Students

1987 ◽  
Vol 31 (8) ◽  
pp. 889-893 ◽  
Author(s):  
Stephen Brown
Keyword(s):  
Learning Styles ◽  
Human Factors ◽  
Environmental Design ◽  
Experimental System ◽  
Electronic Media ◽  
Learning Support ◽  
Cad Systems ◽  
Computer Aided ◽  
Design Students ◽  
Computer Aided Learning

Intelligent CAD systems could be a useful vehicle for disseminating Human Factors principles among non Human Factors designers. Limitations of current CAD systems are discussed and an experimental system is described. It is suggested that future CAD systems should be less than expert, should be responsive to different learning styles and should employ a variety of electronic media at the user interface.

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