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| WoS | SCOPUS | Document Type | Document Title | Abstract | Authors | Affiliation | ResearcherID (WoS) | AuthorsID (SCOPUS) | Author Email(s) | Journal Name | JCR Abbreviation | ISSN | eISSN | Volume | Issue | WoS Edition | WoS Category | JCR Year | IF | JCR (%) | FWCI | FWCI Update Date | WoS Citation | SCOPUS Citation | Keywords (WoS) | KeywordsPlus (WoS) | Keywords (SCOPUS) | KeywordsPlus (SCOPUS) | Language | Publication Stage | Publication Year | Publication Date | DOI | JCR Link | DOI Link | WOS Link | SCOPUS Link |
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| ○ | ○ | Article | X-ray computed tomography of severed root wounds ofPrunus serrulataandZelkova serrata | The performance of laboratory X-ray computed tomography (XCT) for the non-destructive imaging of root wood was evaluated. Lateral roots of oriental cherry (Prunus serrulatavar.spontanea) and Japanese zelkova (Zelkova serrata) were severed in spring and maintained in soil for 6 months. Without sectioning, XCT revealed the phloem, xylem and vascular cambium structures in the root wood. A virtual transverse section showed a ring of woundwood covering the severed, lateral root of the two trees. Different levels of X-ray absorption were evident around the cut surfaces ofP. serrulata; however, they were rarely detected inZ. serrata. More adventitious roots were observed onZ. serratathan onP. serrulata. Distinct white spots in the rays were only detected inZ. serrata. These results suggest that XCT has potential applications in forest pathology, providing virtual sections of wound closure, wood density distribution, organ redifferentiation, and mineral deposition in root wood. | Park, Junhyung; Seo, Dahye; Kim, Ki Woo | Kyungpook Natl Univ, Dept Ecol & Environm Syst, Sangju 37224, South Korea; Kyungpook Natl Univ, Diagnost Ctr, Sangju, South Korea | Kim, Ki Woo/AAC-5623-2022 | 57202928407; 57218319875; 57201369889 | kiwoo@knu.ac.kr; | FOREST PATHOLOGY | FOREST PATHOL | 1437-4781 | 1439-0329 | 50 | 4 | SCIE | FORESTRY | 2020 | 1.363 | 66.4 | 0.21 | 2025-06-25 | 2 | 3 | adventitious root; mineral; tomography; wound | adventitious root; mineral; tomography; wound | Prunus serrulata; Prunus serrulata var. spontanea; Zelkova serrata; adventitious root; detection method; dicotyledon; seasonal variation; tomography | English | 2020 | 2020-08 | 10.1111/efp.12622 | 바로가기 | 바로가기 | 바로가기 | 바로가기 | ||
| ○ | ○ | Article | A numerical investigation on the performance improvement of axial-flow automotive cooling fan with beads | This paper presents a CFD analysis of three types of axial-flow magnesium-based automotive cooling fans. The numerical modeling was conducted for geometrically modified fan designs: one with no-beads, the second one with beads at the suction-side of the fan namely reverse-beads fan, and the third one with beads installed at the pressure-side of the fan namely forward-beads fan. The effect of geometric modifications of the fan blades on the volumetric flow rate, fan efficiency, and energy efficiency was investigated using Reynolds-averaged Navier-Stokes (RANS) equations following the multiple reference frame methodology. The fan with no-beads was fabricated using 3D printing technology and tested to measure the flow velocity. Subsequently, the fans with beads along with the no-beads fan designs were numerically analyzed. The volumetric flow rate, fan efficiency, and energy efficiency were quantified as a function of fan rotating speed. The results show that the reverse-beads fan produced a relatively more volumetric flow rate and energy-efficient compared to the forward-beads fan. Moreover, to further improve the performance of the reverse-beads fan, the location and size of the bead structure were varied along the radial direction of the fan blade. The optimized reverse-beads fan significantly improves the fan performance. | Hur, K. H.; Haider, B. A.; Sohn, C. H. | Kyungpook Natl Univ, Sch Mech Engn, Daegu 41566, South Korea | Haider, Basharat/B-5887-2015; Haider, Basharat Ali/B-5887-2015 | 57218394416; 36805990000; 36806852600 | chsohn@knu.ac.kr; | JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY | J MECH SCI TECHNOL | 1738-494X | 1976-3824 | 34 | 8 | SCIE | ENGINEERING, MECHANICAL | 2020 | 1.734 | 66.5 | 0.08 | 2025-06-25 | 3 | 4 | Automotive cooling fan; Axial fans; CFD; Fan efficiency; Multiple reference frame; Volumetric flow rate | ROTOR DESIGN; OPTIMIZATION; SIMULATION; FIELD | Automotive cooling fan; Axial fans; CFD; Fan efficiency; Multiple reference frame; Volumetric flow rate | 3D printers; Axial flow; Computational fluid dynamics; Energy efficiency; Flow velocity; Navier Stokes equations; Bead structures; Energy efficient; Fan performance; Multiple-reference frames; Numerical investigations; Radial direction; Reynolds averaged Navier Stokes (RANS)equations; Volumetric flow rate; Fans | English | 2020 | 2020-08 | 10.1007/s12206-020-0724-0 | 바로가기 | 바로가기 | 바로가기 | 바로가기 | |
| ○ | ○ | Article | Acoustically monitoring defects on rotating turbine blades | In the present study, the partial loss and distortion of turbine blades were acoustically detected while the turbine was rotating. An ultrasonic signal of a specific frequency (300 kHz) was transmitted in the form of continuous sine waves to the rotating turbine model. The signal was reflected on the turbine blade and received by a receiver. The amplitude of the given frequency component in the received signal was analyzed by signal processing. Because ultrasounds are attenuated easily when propagated into air and have a straight characteristic like light, the characteristics of the signals were examined by a quantitative test. The signal attenuation with respect to distance and the signal reduction by eccentricity were observed and compared with the experimental results. Partial loss decreased the sound reflection area; thus, the signal amplitude was reduced. The signal amplitude was inversely proportional to the size of the defect. Distortion caused larger eccentricity between the transmitter and the receiver. Weaker signals were detected with the more distorted blade. When the blade was distorted by more than 20dg, the amplitude of the signal decreased significantly. In short, defects of turbine blades cause a reduction in the acoustic signal. It was verified that acoustic diagnosis can be applied to detect the partial loss and distortion of turbine blades. | Jo, Hongrae; Kim, Yeongmin; Jo, Daeseong | Kyungpook Natl Univ, Sch Mech Engn, Daegu 41566, South Korea | 57194614170; 57216737789; 16424303000 | djo@knu.ac.kr; | JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY | J MECH SCI TECHNOL | 1738-494X | 1976-3824 | 34 | 5 | SCIE | ENGINEERING, MECHANICAL | 2020 | 1.734 | 66.5 | 0.16 | 2025-06-25 | 3 | 3 | Blade failures; Failure diagnostics; Non-destructive inspection; Ultrasound; Turbine blade | Blade failures; Failure diagnostics; Non-destructive inspection; Turbine blade; Ultrasound | Defects; Signal processing; Signal receivers; Turbine components; Ultrasonic applications; Acoustic diagnosis; Frequency components; Quantitative tests; Rotating turbines; Signal amplitude; Signal attenuation; Specific frequencies; Ultrasonic signals; Turbomachine blades | English | 2020 | 2020-05 | 10.1007/s12206-020-0413-z | 바로가기 | 바로가기 | 바로가기 | 바로가기 | |||
| ○ | ○ | Article | Analysis of temperature distribution in the chip-on-glass bonding process | The chip-on-glass bonding process is one of the most effective packaging methods that can satisfy the need for thin, large, low-cost and light display panels in the liquid crystal display (LCD) industry. This process uses an anisotropic conductive film (ACF) as the adhesion layer between the driver chip and the LCD panel and is based on thermocompressing bonding. Thus, the proper temperature conditions, such as temperature level and even distribution over the film, can play the vital role in the improvement of bonding performance, quality, and reliability. A finite element analysis model for predicting temperature distributions in all the components of the process equipment as well as the driver chip, the LCD panel and the ACF is presented. The accuracy of the developed model is verified by comparing the simulated temperature distribution with the actual one. Consequently, the model is used in determining the tooltip dimension to introduce proper temperature distribution to the driver chip and the film. | Yun, Won-Soo; Jung, Seung Won; Jin, Songwan; Jeong, Young Hun | Korea Polytech Univ, Dept Mech Engn, Seoul 15073, Gyeonggi Do, South Korea; KohYoung Technol Inc, Seoul 08588, South Korea; Kyungpook Natl Univ, Sch Mech Engn, Daegu 41566, South Korea | Jeong, Young/R-2486-2019 | 8293865200; 55471822900; 16645779200; 56501196300 | yhjeong@knu.ac.kr; | JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY | J MECH SCI TECHNOL | 1738-494X | 1976-3824 | 34 | 7 | SCIE | ENGINEERING, MECHANICAL | 2020 | 1.734 | 66.5 | 0.16 | 2025-06-25 | 1 | 2 | Anisotropic conductive film (ACF); Chip-on-glass (COG); Heat transfer; Liquid crystal display (LCD); Temperature distribution | OPTIMIZATION; RESISTANCE | Anisotropic conductive film (ACF); Chip-on-glass (COG); Heat transfer; Liquid crystal display (LCD); Temperature distribution | Chip scale packages; Conductive films; Costs; Glass; Glass industry; Liquid crystal displays; Liquid crystals; Temperature distribution; Anisotropic conductive films; Bonding performance; Finite element analysis model; Liquid crystal display(LCD); Packaging methods; Process equipments; Temperature conditions; Temperature level; Glass bonding | English | 2020 | 2020-07 | 10.1007/s12206-020-0635-0 | 바로가기 | 바로가기 | 바로가기 | 바로가기 | |
| ○ | ○ | Article | Droplet impacting dynamics on wettable, rough and slippery oil-infuse surfaces | In this study, we investigated droplet impact dynamics offalling water drops (D-0 2.3 mm ) on slippery oil-infused surfaces and compared them to other features of the surfaces, to elucidate the wettability- and roughness-controlled characteristics. We prepared transparent substrates with the designed characteristics, so it would be feasible to visualize the droplet impact dynamics in detail. A wide range of impact kinetics (We 800 (=rho D0Vi2/sigma(w))) was covered, which gave rise to several types of droplet-impact: gentle spreading, wavy (undulated fingers of spreading edges), droplet break-up, and splashing with small secondary droplets. The basic parameters of the droplet-solid interactions were measured, and events were mapped with respect to the sample surface and impact kinetic conditions. We found that, generally, surface wettability has a major influence on the triple line shape and instability during the impact and retraction process, and thus determines events in of the framework of the dynamic wetting-failure model. Furthermore, while rough conditions promote instability of the impacted droplet, slippery lubricant-infused features tend to dampen perturbations of the spreading/retracting edge. | Kim, Seolha; Wang, Tao; Zhang, Lei; Jiang, Yuyan | Kyungpook Natl Univ, Dept Precis Mech Engn, Sangju, South Korea; Chinese Acad Sci, Inst Engn Thermophys, Ctr Heat & Mass Transfer, Beijing 100190, Peoples R China; Univ Chinese Acad Sci, Beijing 100049, Peoples R China | JIANG, YUYAN/GQH-1740-2022; 王, 涛/C-5844-2008 | 57195257413; 59565283500; 55951733700; 58944280800 | wangtao@iet.cn;yyjiang@iet.cn; | JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY | J MECH SCI TECHNOL | 1738-494X | 1976-3824 | 34 | 1 | SCIE | ENGINEERING, MECHANICAL | 2020 | 1.734 | 66.5 | 1.09 | 2025-06-25 | 20 | 21 | Droplet impact; Roughness; Slippery oil-infused; Wettability | WETTING SURFACES; DEFORMATION; MICRO | Droplet impact; Roughness; Slippery oil-infused; Wettability | Drops; Dynamics; Substrates; Surface roughness; Basic parameters; Droplet impact; Dynamic wetting failure; Kinetic conditions; Secondary droplets; Slippery oil-infused; Surface wettability; Transparent substrate; Wetting | English | 2020 | 2020-01 | 10.1007/s12206-019-1223-z | 바로가기 | 바로가기 | 바로가기 | 바로가기 | |
| ○ | ○ | Article | Effect of wettability on the water entry problem of aluminum spheres | We investigated the hydrodynamics of water entry by aluminum spheres varying in wettability, assisted by nano/microscaled surface morphology. A wide range of contact angle (C.A.: 0 degrees <= theta(0) < 170 degrees) on the test spheres was prepared via inexpensive single-step anodization method. The water entry events: Splash and cavity formation, were visualized by a high-speed camera to understand the fast transient features affected by the surface wettability. In terms of hydrodynamics, cavity formation and air entrainment during the water entry were analyzed via dynamic wetting of liquid film flow along the sphere surface. It was confirmed that wettability was a determinant factor of both splash shape and cavity formation, especially in hydrophobic condition (90 degrees <= theta(0)). Furthermore, the analysis of dynamic contact angle of liquid film front in this study was able to classify the water entry events more detail than previous literature. In addition, we also recorded audio signals to evaluate acoustic pressures produced by the impact between spheres and water pool. The audio signals, which are expected to be proportional to acoustic pressures, differed when hydrophilic and hydrophobic spheres entered water. | Kim, Seolha; Kim, Dongseob; Kim, Hyungmo | Kyungpook Natl Univ, Dept Precis Mech Engn, Sangju, South Korea; KITECH, Aircraft Syst Technol Grp, Cheonan 31056, South Korea; KAERI, Versatile Reactor Syst Technol Dev Div, Daejeon 34057, South Korea | 57195257413; 56109739900; 35113416400 | hyungmo@kaeri.re.kr; | JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY | J MECH SCI TECHNOL | 1738-494X | 1976-3824 | 34 | 3 | SCIE | ENGINEERING, MECHANICAL | 2020 | 1.734 | 66.5 | 0.23 | 2025-06-25 | 3 | 3 | Air entrainment; Aluminum surface modification; Cavity formation; Water entry | SURFACE; DYNAMICS; SPLASH | Air entrainment; Aluminum surface modification; Cavity formation; Water entry | Air entrainment; Aluminum; Audio acoustics; Contact angle; High speed cameras; Hydrodynamics; Hydrophobicity; Liquid films; Morphology; Spheres; Surface morphology; Aluminum surface; Cavity formation; Determinant factors; Dynamic contact angle; Hydrophilic and hydrophobic; Hydrophobic conditions; Surface wettability; Water entry; Wetting | English | 2020 | 2020-03 | 10.1007/s12206-020-0224-2 | 바로가기 | 바로가기 | 바로가기 | 바로가기 | ||
| ○ | ○ | Article | Effects of the downstream spatial configuration on the energy extraction performance of tandem/parallel combined oscillating hydrofoils | Unsteady 2D laminar flow simulations were performed on tandem oscillating hydrofoils to study the influence of the downstream spatial location on the power extraction efficiency of a tandem/parallel combined configuration. A sinusoidal plunging/pitching motion of NACA 0015 profile was used. Inspired by insect inter-wing spacing, different configurations of the downstream foil (y)-position were first studied at a fixed (L/c) horizontal inter-foil spacing and reduced frequencies within the range of 0.02 to 0.32. It was found that the energy extraction efficiency improved by around 23 % as compared to the conventional tandem configuration by changing the vertical inter-foil spacing. An interesting finding is that, at specified frequencies and inter-foil spacing, the power efficiency extracted from the downstream foil, associated with the new configuration, exceeds the upstream foil efficiency. The horizontal inter-foil spacing was then investigated for an optimal (y)-position of the downstream foil, and the results show that the optimal horizontal spacing was reduced compared to the conventional tandem configuration, resulting in a gain in space and about 15 % of increment in the power extraction efficiency. Therefore, a total of 38 % of power efficiency enhancement was obtained at f * = 0.24 by using the new configuration in which the horizontal inter-foil spacing was reduced five times compared to the conventional configuration. An appropriate inter-foil spacing/frequency synchronization resulted in a favorable foil-vortex interaction that improves the power extraction from the oscillating foil system. The frequency and the inter-foil spacing were found to be critical factors that determine whether the interaction is favorable or unfavorable. | Dahmani, F.; Sohn, C. H. | Kyungpook Natl Univ, Dept Mech Engn, Daegu, South Korea | 57205147808; 36806852600 | chsohn@knu.ac.kr; | JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY | J MECH SCI TECHNOL | 1738-494X | 1976-3824 | 34 | 5 | SCIE | ENGINEERING, MECHANICAL | 2020 | 1.734 | 66.5 | 0.31 | 2025-06-25 | 12 | 11 | Flapping motion; Hydrokinetic turbine; Tandem oscillating foils; Renewable energy; Vortex-foil interaction | POWER-EXTRACTION; FOIL | Flapping motion; Hydrokinetic turbine; Renewable energy; Tandem oscillating foils; Vortex-foil interaction | Hydrofoils; Laminar flow; Oscillating flow; Combined configuration; Horizontal spacing; Oscillating hydrofoil; Power extraction efficiency; Reduced frequency; Spatial configuration; Tandem configuration; Vortex interactions; Extraction | English | 2020 | 2020-05 | 10.1007/s12206-020-0425-8 | 바로가기 | 바로가기 | 바로가기 | 바로가기 | ||
| ○ | ○ | Article | Magnetohydrodynamics around a cylindrical wire carrying electric currents | Vortex shedding phenomenon is closely linked with noise and vibration, many studies that consider the associated environmental or structural safety issues have been conducted. In this study, we have investigated the changes in features of vortex shedding for the case that an electrically conducting fluid flows around a cylinder under circular magnetic fields induced by a line source of electric current. For unsteady laminar flows at Reynolds numbers from 50 to 200, the magnetohydrodynamic simulation was conducted with gradually increasing Stuart number from 0 to 10. The flow features including the drag, lift, and vortex shedding are discussed for different magnetic field patterns (x-directional, y-directional, and circular magnetic fields). The most notable finding is that the drag of the cylinder in a circular magnetic field decreased with increasing magnetic field intensity (drag increases with increasing magnetic field intensity in a uniform horizontal or vertical magnetic field). | Lee, Jong Hui; Son, Jong Hyeon; Park, Il Seouk | Kyungpook Natl Univ, Dept Mech Engn, Daegu 41566, South Korea; Kyungpook Natl Univ, Sch Mech Engn, Daegu 41566, South Korea | Lee, Jong Hui/JFT-0292-2023 | 57204669495; 55156951300; 50262800000 | einstein@knu.ac.kr; | JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY | J MECH SCI TECHNOL | 1738-494X | 1976-3824 | 34 | 4 | SCIE | ENGINEERING, MECHANICAL | 2020 | 1.734 | 66.5 | 0.47 | 2025-06-25 | 6 | 6 | Karman vortex; Magnetohydrodynamics; Circular cylinder; Vortex suppression | CIRCULAR-CYLINDER; 3-DIMENSIONAL INSTABILITIES; HEAT-TRANSFER; FLUID-FLOW; WAKE; WATER | Circular cylinder; Karman vortex; Magnetohydrodynamics; Vortex suppression | Cylinders (shapes); Drag; Laminar flow; Magnetohydrodynamics; Reynolds number; Vortex flow; Vortex shedding; Different-magnetic fields; Electrically conducting fluids; Magnetic-field intensity; Magnetohydrodynamic simulations; Noise and vibration; Structural safety; Unsteady laminar flow; Vertical magnetic fields; Electric lines | English | 2020 | 2020-04 | 10.1007/s12206-020-0319-9 | 바로가기 | 바로가기 | 바로가기 | 바로가기 | |
| ○ | ○ | Article | Optimum interface shape and vibration test for a new transmission helical gear composed of steel and aramid/phenol composite | Hybrid gears made of fiber-reinforced polymeric composite material and steel are recently attracting electric vehicle designers' attention due to their possible advantages such as lightweight and reduced vibration transfer for automotive transmissions. In this study, polymeric composite material is placed in-between the steel teeth and a central hub region in the radial direction of the hybrid helical gear. The partial usage of polymeric composite material for the high torque gear is expected to reduce the transmissibility of vibration from teeth to hub as well as the weight of a transmission gear-train. Using the finite element method, optimization, and vibration tests, a composite hybrid helical gear satisfying strength and vibration characteristics is successfully developed in this study. The reduction in acceleration of the hybrid gear is observed by comparing to that of a 100 % steel gear. From a point of view in damping ratio, the composite hybrid gear can make reduction of vibration by 42.3 %. To secure the bonding strength between steel and composite parts, the design optimization for the complicated bulgy and hollow interface region is performed by considering complex dimensions. | Sim, Eunyoung; Kim, Cheol; Kwak, Ki-Seok; Kim, Bongjoon | Kyungpook Natl Univ, Dept Mech Engn, Daegu 41566, South Korea; Kyung Chang Ind Co, Cent R&D, Daegu 42719, South Korea | 57216363138; 55508786300; 59028635600; 57209794590 | kimchul@knu.ac.kr; | JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY | J MECH SCI TECHNOL | 1738-494X | 1976-3824 | 34 | 4 | SCIE | ENGINEERING, MECHANICAL | 2020 | 1.734 | 66.5 | 0.7 | 2025-06-25 | 13 | 14 | Hybrid gear; Aramid; phenol composite; Design of optimization; Vibration test; Wet-laid process | STRESS-ANALYSIS; SPUR GEAR | Aramid/phenol composite; Design of optimization; Hybrid gear; Vibration test; Wet-laid process | Gear teeth; Polymers; Reinforced plastics; Steel fibers; Steel testing; Vehicle transmissions; Vibration analysis; Automotive transmissions; Complex dimensions; Design optimization; Fiber-reinforced polymeric composites; Polymeric composite materials; Reduction of vibrations; Vibration characteristics; Vibration transfer; Helical gears | English | 2020 | 2020-04 | 10.1007/s12206-020-0325-y | 바로가기 | 바로가기 | 바로가기 | 바로가기 | ||
| ○ | ○ | Article | Practical bending-angle calculation for an automated surgical plate bending apparatus | Surgical plates used for reconstructive surgery require a repetitive manual bending process to fit the plate to the defect during reconstruction. However, this process may not produce a plate that fits well, and repetitive bending may significantly increase the risk of plate fracture due to the accumulation of residual stress. In this study, the input angle is calculated using a proposed finite element process that considers the spring-back effect and improves the accuracy of the bending results without the need for repetitive bending. Bending tests for two arbitrary target angles (15 degrees and 30 degrees) are performed using the apparatus to demonstrate its effectiveness. Accurately bent plates are obtained from a single bending trial, unlike the use of another input angle that does not consider spring-back. Therefore, the proposed bending procedure could potentially replace the repetitive manual bending process and reduce the residual stress within the plate, thus lowering the risk of plate failure. | Park, Si-Myung; Lee, Jeonghwan; Park, Seungbin; Lee, Jung-Woo; Park, Minsoo; Kim, Youngjun; Noh, Gunwoo | Korea Inst Sci & Technol, Ctr Med Robot, Seoul 02792, South Korea; Korea Inst Sci & Technol, Ctr Bion, Seoul 02792, South Korea; Kyung Hee Univ, Sch Dent, Dept Oral & Maxillofacial Surg, Seoul 02447, South Korea; Seoul Natl Univ Sci & Tech, Dept Mech Syst Design Engn, Seoul 01811, South Korea; Kyungpook Natl Univ, Sch Mech Engn, Daegu 41566, South Korea | 57192916912; 57210644350; 57210256364; 56660350300; 7404490337; 57211346021; 55010264000 | gunwoo@knu.ac.kr; | JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY | J MECH SCI TECHNOL | 1738-494X | 1976-3824 | 34 | 5 | SCIE | ENGINEERING, MECHANICAL | 2020 | 1.734 | 66.5 | 0.08 | 2025-06-25 | 2 | 2 | Bending procedure; Mandibular reconstruction; Motorized bending apparatus; Spring-back; Surgical plate | MANDIBULAR RECONSTRUCTION; FIXATION; FRACTURE; PREDICTION; SHEET; SHAPE | Bending procedure; Mandibular reconstruction; Motorized bending apparatus; Spring-back; Surgical plate | Residual stresses; Springs (components); Transplantation (surgical); Bending angle; Bending process; Plate bending; Reconstructive surgery; Spring back; Target angle; Bending tests | English | 2020 | 2020-05 | 10.1007/s12206-020-0432-9 | 바로가기 | 바로가기 | 바로가기 | 바로가기 | ||
| ○ | ○ | Article | Quantitative comparison between volume-of-fluid and two-fluid models for two-phase flow simulation using OpenFOAM | This study compared numerical characteristics of volume-of-fluid (VOF) and two-fluid models for the two-phase flow simulation by using open-source computational fluid dynamics software (OpenFOAM). In both models, the pressure-implicit method for pressure-linked equations was solved to obtain transient pressure and velocity fields. For the simulation of subgrid-scale bubbles, the VOF model was coupled with a Lagrangian discrete bubble model (DBM). In the single bubble rising case, kinematic and dynamic parameters predicted by the two-fluid model were poor. However, in the bubbly flow case, this model predicted the gas and liquid velocities well and, similarly, the liquid front position in the free surface flow case. On the other hand, the VOF model was less accurate in describing bubbly flow, despite the inclusion of the DBM. While the two-fluid model is recommended for the simultaneous simulation of separated and dispersed flows, the VOF model is more effective for separated flows. | Pham, Thinh Quy Duc; Jeon, Jichan; Choi, Sanghun | Kyungpook Natl Univ, Sch Mech Engn, Daegu, South Korea | Choi, Sanghun/AGS-7430-2022 | 57215673039; 57210139607; 55847101000 | s-choi@knu.ac.kr; | JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY | J MECH SCI TECHNOL | 1738-494X | 1976-3824 | 34 | 3 | SCIE | ENGINEERING, MECHANICAL | 2020 | 1.734 | 66.5 | 0.47 | 2025-06-25 | 12 | 11 | Volume-of-fluid (VOF) model; Two-fluid model; Discrete bubble method (DBM); Single bubble rising; Broken dam; Bubble column | LARGE-EDDY SIMULATION; LIQUID FLOW; GAS-LIQUID; BUBBLE; DYNAMICS; TRACKING | Broken dam; Bubble column; Discrete bubble method (DBM); Single bubble rising; Two-fluid model; Volume-of-fluid (VOF) model | Bubble columns; Computational fluid dynamics; Flow simulation; Open source software; Open systems; Plasma flow; Velocity; Broken dam; Discrete bubble method (DBM); Single bubbles; Two fluid model; Volume of fluid model; Two phase flow | English | 2020 | 2020-03 | 10.1007/s12206-020-0217-1 | 바로가기 | 바로가기 | 바로가기 | 바로가기 | |
| ○ | ○ | Article | Semantics-aware adaptive simplification for lightweighting diverse 3D CAD models in industrial plants | In industrial plants, an increasing need has emerged for visualization through three-dimensional (3D) models throughout all lifecycle stages. Lightweight modeling has garnered attention for improved visualization performance. The data size of an entire process plant model is enormous, and the final model consists of various forms of equipment and material model generated from diverse sources. We propose an adaptable method to simplify models with various semantics during the lifecycle of plants. The characteristics of plant equipment and materials are analyzed to define the semantics criteria, upon which the level of semantics (LOS) is defined. The functional requirements of model lightweighting in the plant industry are organized, and comprehensive lightweighting procedures for each stage satisfying those requirements are established. The proposed lightweighting procedures can be applied adaptively to the LOS of each model. We develop a prototype system to demonstrate the proposed method. We conducted simplification experiments for two assembly models with completely different LOS. Two models were simplified gradually and effectively by the proposed simplification procedures, and the data size of each model was reduced by 99 % and 83 %. | Kwon, Soonjo; Lee, Hyunoh; Mun, Duhwan | Korea Adv Inst Sci & Technol, Mech Engn Res Inst, Daejoen 34141, South Korea; Kyungpook Natl Univ, Dept Precis Mech Engn, Sangju 37224, Gyeongsangbuk D, South Korea | Mun, Duhwan/AAC-5360-2020 | 56384805900; 57211034722; 23019305700 | dhmun@knu.ac.kr; | JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY | J MECH SCI TECHNOL | 1738-494X | 1976-3824 | 34 | 3 | SCIE | ENGINEERING, MECHANICAL | 2020 | 1.734 | 66.5 | 0.55 | 2025-06-25 | 7 | 7 | 3D CAD model; Adaptive simplification; Industrial plant; Level of semantics | VOLUME DECOMPOSITION; FEATURE RECOGNITION; LEVEL; SHIP | 3D CAD model; Adaptive simplification; Industrial plant; Level of semantics | 3D modeling; Industrial plants; Life cycle; Semantics; Three dimensional computer graphics; Visualization; 3D CAD Modeling; Adaptive simplification; Functional requirement; Life cycle stages; Material modeling; Plant equipments; Prototype system; Three-dimensional (3D) model; Computer aided design | English | 2020 | 2020-03 | 10.1007/s12206-020-0228-y | 바로가기 | 바로가기 | 바로가기 | 바로가기 | |
| ○ | ○ | Article | Torsional vibration analysis of a planetary gear type antiresonant vibration isolator using transfer matrix method, Part I: System modeling | Recently, a new type of vibration isolator called a dynamic antiresonant vibration isolator (DAVI) has been studied for torsional systems as well as translational systems. In the DAVI for torsional systems, the inertia coupling for the anti-resonance effect is generated by a planetary gear that connects control inertia and inertias at the input and output terminals. In this research, an analytical modeling approach called the transfer matrix method is applied to design a planetary gear type DAVI for complex systems such as an automotive powertrain. Unlike a previous study, inertias of the pinion gears are newly included in the transfer matrix model to improve the model accuracy in this paper. In this part 1 of series papers, the internal configuration of a planetary gear type DAVI system is described and its dynamic model is derived using the transfer matrix method. The derived transfer matrix model is then validated by comparing its frequency response with those obtained by conventional and numerical methods. Finally, the effects of different gear ratios and pinion gear inertia are examined using the derived transfer matrix model. | Lee, Hyeongill; Yoon, Hwan-Sik | Kyungpook Natl Univ, Sch Automot Engn, 2559 Gyeongsangdaero, Sangju 37224, Kyungbuk, South Korea; Univ Alabama, Dept Mech Engn, Coll Engn, Box 870276, Tuscaloosa, AL 35487 USA | Yoon, Hwan-Sik/HHC-3533-2022 | 8261483800; 7402990310 | hyoon@eng.ua.edu; | JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY | J MECH SCI TECHNOL | 1738-494X | 1976-3824 | 34 | 3 | SCIE | ENGINEERING, MECHANICAL | 2020 | 1.734 | 66.5 | 0.16 | 2025-06-25 | 4 | 4 | Torsional antiresonant vibration isolator; Torsional vibration absorber; Automotive powertrain; Planetary gear; Transfer matrix method | Automotive powertrain; Planetary gear; Torsional antiresonant vibration isolator; Torsional vibration absorber; Transfer matrix method | Elastic waves; Frequency response; Machine vibrations; Numerical methods; Powertrains; Vibration analysis; Automotive powertrains; Dynamic anti-resonant vibration isolators; Input and outputs; Planetary Gears; Torsional vibration absorbers; Torsional vibration analysis; Transfer matrix model; Vibration isolators; Transfer matrix method | English | 2020 | 2020-03 | 10.1007/s12206-020-0203-7 | 바로가기 | 바로가기 | 바로가기 | 바로가기 | ||
| ○ | ○ | Article | Torsional vibration analysis of a planetary gear type antiresonant vibration isolator using transfer matrix method, Part II: Application to automotive powertrain | In this research, an analytical modeling and analysis approach called the transfer matrix method is applied to study a planetary gear type dynamic antiresonant vibration isolator (PG-DAVI) for complex rotational systems. In this part 2 of series papers, the transfer matrix method is applied to an automotive powertrain system with an embedded PG-DAVI to characterize torsional vibration attenuation. First, the internal configuration of an automotive powertrain system is described as a baseline system, and its modal characteristics and harmonic responses are calculated. Then, two additional powertrain systems modified with a PG-DAVI and a classical dynamic absorber are presented. Finally, the effectiveness of vibration suppression in the powertrain system using a PG-DAVI is investigated by comparing the modal characteristics, harmonic responses, and time responses of the three powertrain configurations using the transfer matrix method as well as conventional analytical and numerical methods. | Lee, Hyeongill; Yoon, Hwan-Sik | Kyungpook Natl Univ, Sch Automot Engn, 2559 Gyeongsangdaero, Sangju 37224, Kyungbuk, South Korea; Univ Alabama, Dept Mech Engn, Coll Engn, Box 870276, Tuscaloosa, AL 35487 USA | Yoon, Hwan-Sik/HHC-3533-2022 | 8261483800; 7402990310 | hyoon@eng.ua.edu; | JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY | J MECH SCI TECHNOL | 1738-494X | 1976-3824 | 34 | 3 | SCIE | ENGINEERING, MECHANICAL | 2020 | 1.734 | 66.5 | 0.16 | 2025-06-25 | 2 | 2 | Torsional antiresonant vibration isolator; Torsional vibration absorber; Automotive powertrain; Planetary gear; Transfer matrix method | DUAL-MASS FLYWHEEL; DESIGN | Automotive powertrain; Planetary gear; Torsional antiresonant vibration isolator; Torsional vibration absorber; Transfer matrix method | Elastic waves; Machine vibrations; Numerical methods; Powertrains; Vibration analysis; Analytical and numerical methods; Automotive powertrains; Planetary Gears; Powertrain configuration; Torsional vibration absorbers; Torsional vibration analysis; Vibration isolators; Vibration suppression; Transfer matrix method | English | 2020 | 2020-03 | 10.1007/s12206-020-0204-6 | 바로가기 | 바로가기 | 바로가기 | 바로가기 | |
| ○ | ○ | Article | Workspace mapping with adaptive fuzzy control for robotic manipulator in teleoperation | This study addresses the adaptive fuzzy control of redundant robotic systems for developing a new approach to workspace mapping in teleoperation. In robot teleoperation, workspace mapping is applied to accomplish various tasks involving both large reachability and accurate control. However, discontinuous trajectories in teleoperation because of mode change of the master device and undesired inputs during user operation make it difficult for the slave robotic system to follow the trajectories of the master device. Therefore, in this study, a new approach to workspace mapping in teleoperation and the application of an adaptive fuzzy controller for tracking the desired trajectory are proposed. The results of simulations and experiments conducted in this study demonstrate that the proposed workspace mapping approach based on an adaptive fuzzy controller effectively improved system performance in terms of tracking for desired trajectories in robot teleoperation. | Park, Tae Mun; Lee, Sang Ryong; Yi, Hak | Kyungpook Natl Univ, Dept Mech Engn, Daegu, South Korea | 57206474475; 35766722100; 56567311000 | yihak@knu.ac.kr; | JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY | J MECH SCI TECHNOL | 1738-494X | 1976-3824 | 34 | 5 | SCIE | ENGINEERING, MECHANICAL | 2020 | 1.734 | 66.5 | 0.63 | 2025-06-25 | 11 | 12 | Teleoperation; Workspace mapping; Master-slave system; Fuzzy-PID | Fuzzy-PID; Master-slave system; Teleoperation; Workspace mapping | Controllers; Fuzzy control; Manipulators; Mapping; Remote control; Robotics; Trajectories; Adaptive fuzzy control; Adaptive fuzzy controller; Desired trajectories; New approaches; Reachability; Robot teleoperation; Robotic manipulators; Robotic systems; Adaptive control systems | English | 2020 | 2020-05 | 10.1007/s12206-020-0438-3 | 바로가기 | 바로가기 | 바로가기 | 바로가기 |
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