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Simple demanded power point tracking (DPPT) control algorithms with a mode switch are proposed and experimentally validated in this study. One is a torque-based control and uses the generator torque with fixed blade-pitch angle. The other is blade-pitch based and uses both the generator torque and blade pitch for DPPT control. Both control algorithms receive power demand from a higherlevel controller...
Starch-based biomass composites were prepared with starch and plant fiber. In order to improve the properties of the compos ites, oxidized starches (OS) were prepared using hydroxyl peroxide as oxidizer, then glycerol was added into OS as plasticizer to produce thermoplastic oxidized starches (TPOS). Crystal structure, hydrogen bonds of TPOS were researched to gain comprehensive views on the mechanism...
A linear synchronous motor (LSM) is generally used for high-speed maglev train propulsion. For the LSM, the permanent magnet is installed on the train and the stator on the railway. But The stator winding is not practical to install the LSM as the same length as the train travel distance because the electric power is supplied to the entire railway at once, power loss will be significant. Therefore,...
In this paper, we propose a one-piece gravity compensation mechanism (OGCM), which improves energy efficiency by compensating for the gravity torque of the target structure using a combination of a cam mechanism and a compression spring. First, the gravity compensation methodology of the OGCM is explained. Next, an analysis of how to design cam mechanisms as a function of the design variables of other...
Transition from conventional energy paradigm to sustainable energy system is a major challenge in 21st century. This article presents a preliminary shape analysis of an accessorial roof with wind turbine to maximize the utilization of wind energy. This investigation focuses on the optimized accessorial roof shape to assess the performance of wind turbines mounted on an eco-roof. The optimization included...
In conventional deep drawing lubricants are applied to achieve low friction and wear. However, most lubricants contain environmental harmful ingredients. Global trends like sustainability and efficient resource usage motivate the development of lubricant-free deep drawing. However, dry contact conditions lead to intensive interaction between tool and workpiece especially for aluminum alloys with high...
This paper presents a method to fabricate a microfluidic device through polymer solution (polystyrene dissolved in toluene) process by roll-to-roll gravure printing. The printed polymer solution formed a hydrophobic barrier by penetrating as much as the thickness of the paper substrate. Conventional methods require multiple printing or heat treatment processes to form a barrier. However, the method...
Inkjet printing has advantages to be easy to use, environmentally benign and adaptable for flexible electronics manufacturing. Also, paper is an emerging potential substrate due to extremely cheap price and its abundance. We used inkjet printing on a paper to make inexpensive flexible 3-D origami electronics. We printed two pads of 2 × 2 mm2 and the metal lines between pads that had the width of 0...
Electrochromic cells were fabricated via a nanoparticle deposition system (NPDS) using different particle sizes of monoclinic tungsten oxide (WO3). Mixtures of micro- and nano-sized WO3 powders in the ratios of WO3 (micro):WO3 (nano) = 9:1, 5 : 5 and 1 : 9 vol%, were used in this study. NPDS, which was used to fabricate the electrochromic layer, is a low-cost process that can cover a large deposition...
Thin film solid oxide fuel cells (TF-SOFCs) are one of the promising portable power sources in terms of rapid on/off, compact system volume, and high power density. This paper reviews fabrications, and designs of TF-SOFCs operating the temperature range of 300-500°C. The fabricating processes of both the electrolyte and the electrode via chemical vapor depositions and physical vapor depositions are...
The problem of environmental pollution from CO2 emissions is drawing worldwide attention. With this trend, within the automotive industry, development of lightweight parts and application examples are increasing to react to environmental regulations and to obtain better mileage. Furthermore, with the demands of the time to cut energy consumption and to protect the environment, recycling aluminum,...
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