Browsing by Author "Chang, YY"

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Integration of finite element analysis and optimum design on gear systems
(2002-01-01)
Li, CH
;
Chiou, HS
;
Hung, CH
;
Chang, YY
;
Yen, CC
This work establishes a batch module called "integration of finite element analysis and optimum design" by taking gear systems as testing examples. This batch module consists of I-DEAS, ABAQUS/Standard and MOST software, which serve as the preprocessor, the numerical solver and the optimizer, respectively. A simple and practical method was developed, by which this module was enabled to search for contact nodes and elements and to automatically define the contact surfaces for contact analysis. A simple gear-pair system and a complete planetary gear system were successively used as testing examples for this integrated module. The module will automatically construct the geometrical model, analyze contact stress and solve for the optimal solutions when gearing parameters are input. The results are expected to enhance the technology of gear system design. (C) 2002 Elsevier Science B.V. All rights reserved.
Low temperature growth of carbon nanotubes on printing electrodes by MPCVD
(2006-03-01)
Chen, KC
;
Chen, CF
;
Chiang, JS
;
Hwang, CL
;
Chang, YY
In this work, combination of screen-printing process and microwave plasma enhanced chemical vapor deposition system (MPCVD) was applied to fabricate patterned carbon nanotubes (CNTs) on the cathode electrodes on glass substrates. Solution based Ni catalyst was well-mixed with Ag powders and organic binder materials to forin screen printed paste. CNTs were then grown under the atmosphere Of CH4/H-2 gas mixture below 550 degrees C. In the field emission measurement, the tum-on field was 3.2 V/mu m and uniform electron emission image was also observed. (c) 2005 Elsevier B.V. All rights reserved.
The design of precise motion systems by applying both the advanced controllers and the interpolators
(2000)
Chang, YY
;
Hsu, PL
;
電控工程研究所
;
Institute of Electrical and Control Engineering
To improve motion accuracy, past efforts were mainly put on the reduction of tracking errors or contouring errors by employing advanced motion controllers. In this paper, two advanced motion controllers were adopted: (1) the integrated motion controllers [1], and (2) the task coordinate frame (TCF) controllers [2]. Moreover, the NURBS interpolators were also implemented with different algorithms. Experimental results indicate that the design of motion systems must concern both the controller and the interpolator to result in the best motion accuracy.