Browsing by Author "Li, Ai-Tsung"

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Analysis for diving regulator applying local heating mechanism of vapor chamber in insert molding process
(2011-02-01)
Wang, Jung-Chang
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Li, Ai-Tsung
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Tsai, Yu-Pin
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Hsu, Ray-Quen
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機械工程學系
This paper aims to use the local heating mechanism, along with the excellent thermal performance of vapor chamber, to analyze and enhance the strength of products formed after insert molding process. In the insert molding process, the metal insert is firstly placed into the mold, and then formed into an embedded plastic product named diving regulator by injection molding. These results indicate that, the product formed by the local heating mechanism of vapor chamber can reduce the weld line efficiency and achieve high strength, which passed the standard of 15.82 N-m torque test, with a yield rate up to 100%. (C) 2010 Elsevier Ltd. All rights reserved.
Study of an electromagnetic control swing blade blower
(2015-04-15)
Li, Ai-Tsung
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Tseng, Hsuan-Kai
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Hsu, Ray-Quen
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機械工程學系
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Department of Mechanical Engineering
Investigation of an electromagnetically controlled swing blade blower is the major objectives of this study. A fan of this type consumes low power, emits little noise and vibration, and is small in size, which makes it suitable for application in consumer electronic products. It is based on the interaction between a permanent magnet and a magnetic coil field. This drives the fan blades, increasing the volume of wind flow. Therefore, the fan design is a major factor in the wind velocity. In this study, materials, fan shape, and the resonance frequency are the design parameters considered. With proper resonance frequency and blade shape, air flow can be greatly increased. Both numerical simulations and experimental analysis were carried out in this study. ANSYS software was used in a 2D simulation to predict the flow fields and compare the results with experiments to construct a simulation system. The simulation system was used to study various blade related parameters including materials, thickness, fan shape, resonance frequency, and fan tip displacement on the airflow wind velocity, while the power consumption was maintained within 0.25 W via electromagnetic actuator. Numerical simulations and experimental results show that trimming the fan blade area causes the resonance frequency and the tip displacement to increase. Therefore, with proper fan shape, the Aluminum 1050 fan obtained the highest wind velocity, up to 1.81 m/s. In sum, the numerical simulations and experimental results provide a better understanding of electromagnetic swing blade blower design. (C) 2015 Elsevier B.V. All rights reserved.
The development of a cross-flow fan for electronic devices cooling with a focus on laptop computers
(2014-01-01)
Li, Ai-Tsung
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Hsu, Ray-Quen
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機械工程學系
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Department of Mechanical Engineering
The directive is to develop a new type of cross-flow fan for cooling electronic devices. First, the module is based on the 60X60X6mm fan and attempts to use several parameters to enhance the fan\'s performance. The parameters considered here include blade number, angle of the blade, impeller diameter, divergent structure, and outlet area. Both numerical and experimental analyses are carried out on the cross-flow fan which was oriented horizontally. The ANSYS Fluent software is used in a 2D simulation to predict the heat transfer coefficient and the flow fields. Next, the flow and acoustic noise measurements are carried out at different parameters with the aid of AMCA and semi-anechoic chambers. The results show that when the outlet vent size is 70% of fan outside diameter the outcome is an enhanced fan performance of 12%. The optimal number of blades is 37. A block is inserted below the fan blade to improve the fan performance by 8%. The numerical and experimental values of air flow were plotted and found to be consistent. In summary, this study provides a systematic process to develop a cross-flow fan that can meet the requirements for thin and light laptop computers.