Browsing by Author "Hsu, R. Q."

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Design and simulation of a MEMS high G inertial impact sensor
(2008)
Wang, Y. P.
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Hsu, R. Q.
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Wu, C. W.
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機械工程學系
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Department of Mechanical Engineering
Conventional inertial impact sensors typically use mechanisms such as cantilever beams or axial springs as triggering devices. Reaction time for these conventional impact sensors are either far too slow or, in many cases, fail to function completely for high G applications. In this study, a MEMS high G inertial impact sensor with a measurement range of 8,000-21,000 G is presented. The triggering mechanism is a combination of cantilever and spring structure. The design of the mechanism underwent a series of analyses. Simulation results indicated that a MEMS high G inertial impact sensor has a faster reaction time than conventional G inertial impact sensors that use a cantilever beam or spring mechanism. Furthermore, the MEMS high G inertial impact sensor is sufficiently robust to survive the impact encountered in high G application where most conventional G inertial impact sensors fail.
Design and Test of a MEMS-Based High G Smart Sensor
(2011-04-01)
Wang, Y. P.
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Hsu, R. Q.
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Wu, C. W.
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機械工程學系
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Department of Mechanical Engineering
Most conventional G sensors use cantilever beams or axial springs as triggering devices. The reaction time of these conventional G sensors are often far too long. In many high G (> 300 G) applications, they completely fail to function. This study proposed a microelectromechanical systems-based high G smart sensor, which not only functions at a very high G impact but also identifies the material when a projectile makes an impact on a hard object. This high G smart sensor is intended for use at 3000-21 000 G. The sensor was made of silicon and the triggering mechanism involves a cantilever and a spring structure. The mechanical sensitivity of the sensors can be adjusted to preset the triggering G value. Four sensors, each designated to trigger its own G value were integrated in a unit. Experiments demonstrated that this unit can identify the characteristics of an object.
DESIGN OF A NON-POWERED MEMS HIGH G SHOCK SENSOR
(2008)
Wang, Y. P.
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Hsu, R. Q.
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Wul, C. W.
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機械工程學系
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Department of Mechanical Engineering
Conventional shock sensors typically use mechanisms such as cantilever beams or axial springs as triggering devices. Reaction time for these conventional shock sensors are either far too slow or, in many cases, fail to function completely for high G (> 300G) applications. In this study, a non-powered MEMS high G shock sensor with a measurement range of 3,000-21,000 G is presented. The triggering mechanism is a combination of cantilever and spring structure. The design of the mechanism underwent a series of analyses. Simulation and test results indicated that a MEMS high G shock sensor has a faster reaction time than conventional G shock sensors that use a cantilever beam or spring mechanism. Furthermore, the MEMS high G shock sensor is sufficiently robust to survive the impact encountered in high G application where most conventional G shock sensors fail.
Finite Element Analysis of a MEMS-Based High G Inertial Shock Sensor
(2008)
Wang, Y. P.
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Hsu, R. Q.
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Wu, C. W.
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機械工程學系
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Department of Mechanical Engineering
Conventional mechanical inertial shock sensors typically use mechanisms such as cantilever beams or axial springs as triggering devices. Reaction time for these conventional shock sensors are either far too slow or, in many cases, fail to function completely for high G (> 300G) applications. In this study, a Micro-Electro-Mechanical (MEMS)-based high G inertial shock sensor with a measurement range of 3,000-21,000 G is presented. The triggering mechanism is a combination of cantilever and spring structure. The design of the mechanism underwent a series of analyses. Simulation results indicated that a MEMS-based high G inertial shock sensor has a faster reaction time than conventional G inertial shock sensors that use a cantilever beam or spring mechanism. Furthermore, the MEMS-based high G inertial shock sensor is sufficiently robust to survive the impact encountered in high G application where most conventional G inertial shock sensors fail.
Prediction of slug carry-up by the punch in blanking by air-blow of the slug
(2008-05-26)
Hsu, R. Q.
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Chang, J. R.
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Liang, D. L.
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機械工程學系
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Department of Mechanical Engineering
Blanking is one of the press working operations most often encountered in sheet-metal processing. The punched part or slug which should fall down through the die cavity was occasionally brought upward by the punch and dropped on the strip stock which will hinder the following blanking operation. Though there are many ways to reduce this problem, however, this phenomenon still exists when stamping a very thin gauge strip in a highspeed press. Methods which can help us predict the occurrence of the slug suck-up by the punch in blanking are thus important. In this study, a prediction method is proposed for the occurrence of the phenomenon by air-blow of the slug. Parameters like material tensile strength, punch/die clearances, punch chamfer degree, punch corner radius were considered in organizing the experiment plans. The results showed that the slug carry-up forces measured from direct air-blow of the slug can be adopted as a criterion for the occurrence of the phenomenon. The best and worst parameter combinations were also identified by this method. (C) 2008 Published by Elsevier B.V.
The Photocatalytic Activity and Compact Layer Characteristics of TiO2 Films Prepared Using Radio Frequency Magnetron Sputtering
(2014)
Chang, H. C.
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Huang, H. H.
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Wu, C. Y.
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Hsu, R. Q.
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Hsu, C. Y.
TiO2 compact layers are used in dye-sensitized solar cells (DSSCs) to prevent charge recombination between the electrolyte and the transparent conductive substrate (indium tin oxide, ITO; fluorine-doped tin oxide, FTO). Thin TiO2 compact layers are deposited onto ITO/glass by means of radio frequency (rf) magnetron sputtering, using deposition parameters that ensure greater photocatalytic activity and increased DSSC conversion efficiency. The photoinduced decomposition of methylene blue (MB) and the photoinduced hydrophilicity of the TiO2 thin films are also investigated. The photocatalytic performance characteristics for the deposition of TiO2 films are improved by using the Grey-Taguchi method. The average transmittance in the visible region exceeds 85% for all samples. The XRD patterns of the TiO2 films, for sol-gel with spin coating of porous TiO2 /TiO2 compact/ITO/glass, show a good crystalline structure. In contrast, without the TiO2 compact layer (only porous TiO2), the peak intensity of the anatase (101) plane in the XRD patterns for the TiO2 film has a lower value, which demonstrates inferior crystalline quality. With a TiO2 compact layer to prevent charge recombination, a higher short-circuit current density is obtained. The DSSC with the FTO/glass and Pt counter electrode demonstrates the energy conversion efficiency increased.
The structure and photocatalytic activity of TiO2 thin films deposited by dc magnetron sputtering
(2012-12-01)
Yang, W. J.
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Hsu, C. Y.
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Liu, Y. W.
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Hsu, R. Q.
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Lu, T. W.
This paper seeks to determine the optimal settings for the deposition parameters, for TiO2 thin film, prepared on non-alkali glass substrates, by direct current (dc) sputtering, using a ceramic TiO2 target in an argon gas environment. An orthogonal array, the signal-to-noise ratio and analysis of variance are used to analyze the effect of the deposition parameters. Using the Taguchi method for design of a robust experiment, the interactions between factors are also investigated. The main deposition parameters, such as dc power (W), sputtering pressure (Pa), substrate temperature (degrees C) and deposition time (min), were optimized, with reference to the structure and photocatalytic characteristics of TiO2. The results of this study show that substrate temperature and deposition time have the most significant effect on photocatalytic performance. For the optimal combination of deposition parameters, the (110) and (200) peaks of the rutile structure and the (200) peak of the anatase structure were observed, at 2 theta similar to 27.4 degrees, 39.2 degrees and 48 degrees, respectively. The experimental results illustrate that the Taguchi method allowed a suitable solution to the problem, with the minimum number of trials, compared to a full factorial design. The adhesion of the coatings was also measured and evaluated, via a scratch test. Superior wear behavior was observed, for the TiO2 film, because of the increased strength of the interface of micro-blasted tools. (C) 2012 Elsevier Ltd. All rights reserved.