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RISS 인기검색어
- 검색키워드
- 저자 : Thanh-Phong Dao (검색결과 5 건)
- 무료
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Thanh-Phong Dao,Shyh-Chour Huang 대한기계학회 2015 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.29 No.8
A flexible bearing with compliant mechanisms for high-precision mechanism applications has been established as an efficient structure. We have attempted to realize a novel robust design of a flexible bearing with one degree of freedom (1-DOF) translation for highprecisionmechanisms. First, the relationship between five design variables and the stress of the displacement responses is illustratedusing the response surface method. Next, the Taguchi method, combined with a utility concept, is adopted to determine the optimal parametercombination to minimize stress while simultaneously maximizing displacement. An orthogonal array L27 is used in the experimentalwork. The experimental results show that displacement and stress values measured 0.11332 mm and 37.625 MPa, respectively. The confirmation results fall within 95% of the CICE. The proposed methodology is useful for the robust design of flexible bearings andrelated mechanisms.
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Compliant thin-walled joint based on zygoptera nonlinear geometry
Thanh-Phong Dao,Shyh-Chour Huang 대한기계학회 2017 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.31 No.3
This paper introduces a Compliant thin-walled joint (CTWJ) that expands the group of existing compliant joints. The CTWJ design is based on the nonlinear geometry of the zygoptera animal. With a thin-walled structure, the CTWJ allows a considerably large range of motion in the x-and-y axes. In addition, the thin-walled structure is then filled by polydimethylsiloxane material to reinforce the stiffness of the CTWJ. First, design of experiment methodology is used for the sensitive analysis of the width and the thickness to the strain of joint. The range of motion, the strain, the buckling behavior, and the first natural frequency of CTWJ are investigated via finite element analysis and experiments. The behavior of the CTWJ is subsequently compared with the conventional compliant joints to realize the efficient performance of the CTWJ. The results revealed that the CTWJ has a range of motion and strain energy larger than those of traditional compliant joints. Finally, an example of vibration isolator is modeled by using the CTWJ as planar spring. It is believed that the CTWJ has a great potential for the development of compliant mechanisms in terms of large range of motions in mutliple axes.
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Kim, Sangho,Dao, Vinh Ai,Trinh, Thanh Thuy,Duy Phong, Pham,Park, Jinjoo,Thi Hanh Thu, Vu,Thuy Ngoc Thuy, Nguyen,Thi Thanh Giang, Ngo,Lee, Sunhwa,Yi, Junsin Institute of Physics 2019 Semiconductor science and technology Vol.34 No.6
<P>In this study, a recorded high open-circuit voltage (V<SUB>oc</SUB>) of 1.61 V and fill factor (FF) of 76.65% of a-Si:H p-i-n/heterojunction with intrinsic thin layer (HIT)-type multi-junction solar cells were achieved using grain size enlargement within the p-type <I>μ</I>c-Si:H layer in a p-type <I>μ</I>c-Si:H/n-type a-Si:H tunneling recombination junction (TRJ) layer. The p-type <I>μ</I>c-Si:H layer’s conductivity increased from 1.74?×?10<SUP>−4</SUP> to 0.1 S cm<SUP>−1</SUP> as the film’s crystallinity increased from 41.5% to 67.5%. The a-Si:H p-i-n/HIT-type multi-junction solar cells also benefited from the tuning up crystalline p-type <I>μ</I>c-Si:H layer, showing the increase of V<SUB>oc</SUB> and FF from 1.5 V and 49.88% to 1.61 V and 76.65%, respectively; while the short-circuit current density (9.38?±?0.2 mA cm<SUP>−2</SUP>) did not change significantly. These are the highest V<SUB>oc</SUB> and FF values achieved in a-Si:H p-i-n/HIT-type multi-junction solar cells, recently. From dark current-voltage analysis, it was deduced that the enhanced crystalline films could assist in suppressing carrier interference in the TRJ layer, thus reduces electric field distortion and mitigates recombination in the device. In summary, an enhanced crystalline p-type <I>μ</I>c-Si:H layer could be a viable option for ensuring an excellent TRJ layer, thus achieved high efficiency of inorganic/c-Si tandem solar cells. Using optimal condition with crystallinity of 74.1%, the photovoltaic parameters of the device yield V<SUB>oc</SUB>, J<SUB>sc</SUB> and FF of 1.51 V, 13.01 mA cm<SUP>−2</SUP> and 71.45%, which in turned giving an efficiency of 14.04% for a-SiGe:H p-i-n/HIT-type tandem solar cell.</P>
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Shyh-Chour Huang,Thanh-Phong Dao 한국정밀공학회 2016 International Journal of Precision Engineering and Vol.17 No.8
This paper presents the mechanical design and computational optimization for a flexure-based XY positioning platform that is capable of performing planar translational motion with two degrees of freedom in the-x and-y axes. During the mechanical design, the hybrid leaf spring and right circular hinges are adopted to increase the travel displacement and reduce the cross-axis coupling errors. These hybrid joints create the parallelogram structures which provide the functions of joint and transmission mechanisms with excellent decoupling properties. The statistics and dynamics of the mechanism are analyzed, and these analyses are validated with FEA and experimental results. A finite element analysis-based response surface methodology is utilized to solve the multi-objective optimization problems and thus the static and dynamic characteristics of the positioning platform are improved. The prototype is fabricated using a wire electric discharge machining technique. The experimentations are carried out to investigate the performance of the platform and verify the established performance characteristics and optimization methodologies. The experimental results reveal that the platform has a broad workspace range in excess of 125 μm × 125 μm with a first-order natural frequency of 740 Hz. The cross-axis coupling ratio is less than 0.6% verifying the excellent decoupling property.
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La Nam Phat,Tran Quoc Thang,Huynh Cam Nguyen,Dang Thi My Duyen,Dao Xuan Tien,Bui Dang Dang Khoa,Pham Tan Khang,Nguyen Thi Huong Giang,Hoang Minh Nam,Mai Thanh Phong,Nguyen Huu Hieu 한국화학공학회 2021 Korean Journal of Chemical Engineering Vol.38 No.11
Recycling biomass to cellulose aerogel (Cell-A) provides a promising approach to develop adsorbent materials for spilled-oil recovery. In this work, Cell-A was fabricated from Vietnamese water hyacinth via crosslinking methods using PVA as a crosslinker and freeze-drying process. Various cellulose to PVA ratios were investigated to obtain the optimal synthesis condition. The Cell-A was additionally modified by dip-coating in poly(dimethylsiloxane) (PDMS) and pyrolyzing to form PDMS-coated cellulose aerogels (Cell-AP) and carbon aerogels (CA), respectively. Results of the oil adsorption tests show that pyrolysis produced aerogels with greater adsorption capacity with an optimal mass ratio of 15 : 1 cellulose to PVA. Furthermore, the pseudo-second-order model was found to be more accurate than the pseudo-first-order model for the study of oil absorption kinetics. As a result, the modified cellulose aerogel is promising for replacing earth-unfriendly polymer-based oil sorbents due to their high oil absorption capacity.
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