Practical Design Problems

1980 ◽  
pp. 115-119
Author(s):  
John B. Gosling
Keyword(s):  
Design Problems ◽  
Practical Design

DESIGN-ORIENTED BIFURCATION ANALYSIS OF POWER ELECTRONICS SYSTEMS

2011 ◽  
Vol 21 (06) ◽  
pp. 1523-1537 ◽  
Author(s):  
CHI K. TSE ◽  
MING LI
Keyword(s):  
Hopf Bifurcation ◽  
Power Electronics ◽  
Bifurcation Analysis ◽  
Period Doubling ◽  
Current Status ◽  
Main Difficulty ◽  
Design Problems ◽  
Practical Design ◽  
Underlying Causes ◽  
Bifurcation Behavior

Bifurcation analysis has been applied to many power electronics circuits. Literature abounds with results regarding the various ways in which such circuits lose stability under variation of some selected parameters, e.g. via period-doubling bifurcation, Hopf bifurcation, border collision, etc. The current status of research in the identification of bifurcation behavior in power electronics has reached a stage where the salient types of bifurcation behavior, their underlying causes and the theoretical parameters affecting them have been well understood. Currently, the emphasis of research in this field has gradually shifted toward applications that are of direct relevance to practical design of power electronics. One direction is to apply some of the available research results in bifurcation behavior to the design of practical power electronics circuits. The main difficulty is that the abstract mathematical presentations of the available results are not directly applicable to practical design problems. In this paper we will discuss how research efforts may be directed to bridge this gap.

A Method of Cultural Creative Product Design Based on Reverse Engineering

2013 ◽  
Vol 365-366 ◽  
pp. 1247-1250
Author(s):  
Lan Yao ◽  
Chao Jiang ◽  
Sui Huai Yu
Keyword(s):  
Reverse Engineering ◽  
Product Design ◽  
Design Method ◽  
Practical Significance ◽  
Design Work ◽  
Design Problems ◽  
Cultural Elements ◽  
The Social ◽  
Practical Design ◽  
Important Design

With the improvement of the social civilization, culture connotations of design problems have become increasingly prominent. And the cultural elements must integrate into design work to get development. Since cultural and creative product design is the re-exhibition of culture, traditional culture spirit connotation and cultural nutrition should be grasped and absorbed. Reverse engineering is a very important design method which is widely used in product design. Based on reverse engineering, a rapid and high quality creative design method over cultural and creative product design is proposed. The practical design application proves that the proposed method is feasible, of practical significance and application value.

Computer graphics in nonlinear design problems

1979 ◽  
Vol 6 (1) ◽  
pp. 97-111 ◽  
Author(s):  
John L. Gross ◽  
Thomas A. Mutryn ◽  
William McGuire
Keyword(s):  
Computer Graphics ◽  
Analytical Procedure ◽  
Color Image ◽  
General Procedure ◽  
Design Tool ◽  
Interactive Approach ◽  
Design Problems ◽  
Analysis And Design ◽  
Nonlinear Design ◽  
Practical Design

The purpose of this paper is to describe an interactive computer graphics approach to the analysis and design of structures exhibiting nonlinear structural behavior. A general procedure for the nonlinear analysis of planar frame structures, which accounts for member yielding, is described. In addition, the graphics programs required to input an arbitrary planar structure, monitor the analytical procedure, and aid in evaluating the results of the incremental analysis are presented. A procedure for generating a color image of the deflected structure, where the color indicates the proximity to yield, is also presented. This interactive approach to a powerful analysis procedure, aided by graphic interpretation of input and analysis results, provides a practical desïgn tool.

Practitioner-Educator Model for Human Factors/Ergonomics Education

2021 ◽  
Vol 65 (1) ◽  
pp. 53-56
Author(s):  
Keith S. Karn ◽  
Esa M. Rantanen ◽  
Russell J. Branaghan ◽  
Michael F. Rayo ◽  
Christopher A. Sanchez ◽  
...  
Keyword(s):  
Human Factors ◽  
Real World ◽  
Clinical Psychology ◽  
Performing Arts ◽  
Military Strategy ◽  
Design Problems ◽  
Building Trades ◽  
Visual And Performing Arts ◽  
Practical Design ◽  
Highly Skilled

Human factors/ergonomics is an applied discipline. As such, we question whether students are adequately prepared if they are not learning, at least in part, from instructors who have real-world experience applying human factors/ergonomics knowledge to practical design problems. A wide variety of other disciplines such as medicine, the building trades, clinical psychology, military strategy, aviation, and the visual and performing arts have all faced this question and come up with educational approaches that typically include educators who are highly skilled in the practice of the discipline. Terms such as practitioner-scholar and scientist-practitioner, and the apprentice models all reflect this notion of students learning from highly skilled, knowledgeable, and practiced professionals in their disciplines. Is it time for human factors/ergonomics education to adopt such a model?

Pressure Losses in Smooth Pipe Bends

1960 ◽  
Vol 82 (1) ◽  
pp. 131-140 ◽  
Author(s):  
H. Ito¯
Keyword(s):  
Cross Section ◽  
Experimental Studies ◽  
Circular Cross Section ◽  
Empirical Formulas ◽  
Design Problems ◽  
Pressure Losses ◽  
Test Information ◽  
Present Test ◽  
Practical Design ◽  
Smooth Pipe

The results of extensive experimental studies to determine the pressure losses for turbulent flow in smooth pipe bends of circular cross section are presented in this paper. To make the data usable in practical design problems, the results are discussed in relation to those found by previous investigators, and empirical formulas for the bend-loss coefficient are given. The general correlation of the test data appears to be as good as our present test information will permit.

Pulse-Width Relay Control in Sampling Systems

1961 ◽  
Vol 83 (1) ◽  
pp. 65-76 ◽  
Author(s):  
Winston L. Nelson
Keyword(s):  
Control Systems ◽  
Pulse Width ◽  
Sufficient Conditions ◽  
Sampling Period ◽  
Specific Design ◽  
Design Problems ◽  
Relay Control ◽  
Practical Design ◽  
Sampling Systems ◽  
Theoretical Results

The use of pulse-width control for the on-off regulation of systems subject to sampling is investigated in this paper. The inherent inability of simple on-off control to achieve accurate, or dead-beat control in sampling systems is demonstrated, and methods for predicting and minimizing the limit-cycle behavior of these systems are given. It is then shown that if the on-off control is modified by allowing control of the “on” time during each sampling period, it is possible to achieve asymptotically stable dead-beat control. Sufficient conditions for the asymptotic stability in the large of pulse-width control systems are developed, using the “second method” of Lyapunov. Practical design of pulse-width controllers is developed from the theoretical results and experimental evaluation is given for some specific design problems.

Theoretical And Practical Design Considerations for Ultra-High Resolution Electron Lenses

1980 ◽  
Vol 38 ◽  
pp. 266-269
Author(s):  
Y. Harada ◽  
K. Tsuno ◽  
Y. Arai
Keyword(s):  
Optical Properties ◽  
High Resolution ◽  
Chromatic Aberration ◽  
Point Of View ◽  
Pole Piece ◽  
Axial Field ◽  
Design Considerations ◽  
Resolution Electron ◽  
Practical Design ◽  
Peak Flux

Magnetic objective lenses, from the point of view of pole piece geometry, can he roughly classified into two types, viz., symmetrical and asymmetrical. In the case of the former, the optical properties have been calculated by several authors1-3) and the results would appear to suggest that, in order to reduce the spherical and chromatic aberration coefficients, Cs and Cc, it is necessary to decrease the half-width value of the axial field distribution and to increase the peak flux density. The expressions for either minimum Cs or minimum Cc were presented in the form of ‘universal’ curves by Mulvey and Wallington4).

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