Thesis (M.A.)--Taiwan da xue. / Spine title. Reproduced from ms. copy. eContent provider-neutral record in process. Description based on print version record. Includes bibliographical references (p.122-124).

No description available.

Thesis (M.A.)--University of Hong Kong, 1991. / Also available in print.

Mémoire numérisé par la Direction des bibliothèques de l'Université de Montréal.

<p>Abstract</p><p>This master’s thesis is a project of 20p made in accordance with the requirements set by Halmstad University for a Master’s degree in Technical Product and Productions development. The objectives were to make a conceptual redesign of a portable fan for the</p><p>American company Hunter Fan. The redesign is intended to be suitable on the</p><p>Scandinavian market. The methodology and process are mainly based on Ullman’s</p><p>methodology for product development, in combination with Landqvist’s and Östelin’s</p><p>design methodology for production development. An optimal design process is rarely</p><p>identical from project to project; the best parts and tools from the different design</p><p>methodologies were used as support during the process.</p><p>The design process in this project started with research within topics suitable to solve the</p><p>problem definition. Brand research were made to determine Hunter Fan core values and</p><p>target group, the existing product was analysed to see what could be improved and the</p><p>market was investigated to learn from competitors. An image board was made to express</p><p>the values wanted for this project and for communication with people directly involved in</p><p>the design process. Trends were observed by a visit to the Stockholm Furniture Fair.</p><p>Further user personas and surveys were made to investigate the Scandinavian consumer’s</p><p>needs and requirements. This method gave important knowledge of how to design a</p><p>portable fan suitable for the Scandinavian market. Experts on the subject of matter were</p><p>interviewed to get understanding of how fan blade works and what alternative safety</p><p>solutions there are. In the ideation phase, brainstorming and sketching was a big part.</p><p>Over a hundred idea sketches were made and the ideas were carefully evaluated against</p><p>collected fact. In the finalization phase, the remaining concepts were refined with</p><p>methods like mock-up models, CAD and computer renderings.</p><p>The result is a successful conceptual design of a table fan suitable for the Scandinavian</p><p>market. Hunter Fan also believes the fan can easily be transformed to the Urban</p><p>American cities of New York and other large cities. The table fan owns the values of</p><p>Scandinavian design; a simple uncomplicated design, functional and with an expression</p><p>of simplicity and modernity. It still owns Hunter Fan core value of high quality. The</p><p>design easily blends in the carefully decorated Scandinavian home. It is also easy to</p><p>move, put away and store like the Scandinavian consumer requires. There is a need on the</p><p>Scandinavian market for a well designed portable fan and the final design of this project</p><p>fulfill the requirements to be a successful product.</p>

ABSTRACT Fan cooling is a fairly mainstream and well-developed technology. Vibration may make users feel uncomfortable. Assembly system may produce different noises right after the adverse effect components were destroyed, such as computer crashed or vibration or fan structural damage subsequently affects their fan reliability. Therefore, small vibration resonance amplification can not be overlooked. The researcher applied a 40 * 40 * 48mm fan to solve the problem of resonant vibration. He found the similar results of the natural frequencies of the structure of the fan by experimental and finite element analysis. In order to improve the vibration resonance, he changed the structural of the fans. In different structural designs, the natural frequencies did not change a lot. The natural frequency switched from 3000Hz to 3200Hz. To avoid the resonant frequency of the assemble fan, the researcher changed the number of fan blades and simulated the flow field. Compared the data to the experimental results, the results of the analysis were reasonable. The results showed the performance of the assembly fan did not necessarily need more leaves. The leaf numbers were from 7 (Inlet Fan) & 4 (Outlet Fan) into 5 (Inlet Fan) & 4 (Outlet Fan). Operation speed was changed from 14500 rpm (Inlet & Outlet Fan) to 15500 rpm (Inlet Fan) &11600 rpm (Outlet Fan). Using the fluid flow analysis, he found the change of the leaf number and operation speed of the fan could effectively avoid the resonance frequency and reduce vibration. An impact analysis was also helped to verify the capacity of the anti-impact of the fan. The structure of the fan after the preliminary design has been shaped mostly. By only changing the structural design to avoid excitation of the resonant frequency is difficult to achieve the effective function. To ensure the product stability, it is necessary to deal with the inducing vibration of the fluid flow.

Single-phase brushless fan motor is investigated in this thesis and is fabricated by UMC 0.5 m double-poly, triple-metal, N-Well CMOS process for notebook micro fan motor applications. H-bridge and embedded power mos architecture are used in implemented driver circuit, and an external capacitor is needed for pulse width modulation speed control. A comparator with hysteresis and digital lock detection and auto self-restart function are also implemented in this thesis. Besides, in order to prevent the rush current in output stage, the switch operation of power mos transistors are controlled individually.

Abstract This master’s thesis is a project of 20p made in accordance with the requirements set by Halmstad University for a Master’s degree in Technical Product and Productions development. The objectives were to make a conceptual redesign of a portable fan for the American company Hunter Fan. The redesign is intended to be suitable on the Scandinavian market. The methodology and process are mainly based on Ullman’s methodology for product development, in combination with Landqvist’s and Östelin’s design methodology for production development. An optimal design process is rarely identical from project to project; the best parts and tools from the different design methodologies were used as support during the process. The design process in this project started with research within topics suitable to solve the problem definition. Brand research were made to determine Hunter Fan core values and target group, the existing product was analysed to see what could be improved and the market was investigated to learn from competitors. An image board was made to express the values wanted for this project and for communication with people directly involved in the design process. Trends were observed by a visit to the Stockholm Furniture Fair. Further user personas and surveys were made to investigate the Scandinavian consumer’s needs and requirements. This method gave important knowledge of how to design a portable fan suitable for the Scandinavian market. Experts on the subject of matter were interviewed to get understanding of how fan blade works and what alternative safety solutions there are. In the ideation phase, brainstorming and sketching was a big part. Over a hundred idea sketches were made and the ideas were carefully evaluated against collected fact. In the finalization phase, the remaining concepts were refined with methods like mock-up models, CAD and computer renderings. The result is a successful conceptual design of a table fan suitable for the Scandinavian market. Hunter Fan also believes the fan can easily be transformed to the Urban American cities of New York and other large cities. The table fan owns the values of Scandinavian design; a simple uncomplicated design, functional and with an expression of simplicity and modernity. It still owns Hunter Fan core value of high quality. The design easily blends in the carefully decorated Scandinavian home. It is also easy to move, put away and store like the Scandinavian consumer requires. There is a need on the Scandinavian market for a well designed portable fan and the final design of this project fulfill the requirements to be a successful product.

I denna uppsats undersöks hur deltagarkulturen ser ut på gräsrotsnivå, hos de som skriver och läser fan fiction. Utifrån två fan fic-berättelser undersöks interaktionen mellan författare och läsare. Eftersom forskningen inom fan fiction och deltagarkulturer belyser möjligheten till lärande undersöks hur och om konsumenternas produktion på denna nivå främjar lärandet i skapandet av fan fiction. En intressant aspekt när det gäller deltagarkulturen är hur gränsen mellan producent och konsument blir diffus. Kan man, utifrån undersökningen utläsa om gränsen mellan dessa, producent och konsument – författare och läsare – upplöses? Frågeställningar för undersökningen är: Hur interagerar läsarna och författarna med varandra? På vilka sätt engagerar sig läsarna i berättelsen och dess utveckling? Hur förhåller de sig till författarens tolkning och hur ser de/använder de sin roll som läsare? På vilka/vilket sätt uppmanar och/eller uppmuntrar författarna kommentarer och respons från sina läsare? Hur hanterar de kommentarerna? I vilken utsträckning framträder en informell lärmiljö på communityt? Hur ser den ut och kännetecknas den av deltagarkulturen?

Thesis--University of California, Berkeley. / Includes bibliographical references (leaves 260-289).