• Title/Summary/Keyword: Longitudinal resistance

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Flexural behaviour and capacity of composite panels of light gage steel and concrete

  • Shi, L.;Liu, Y.;Dawe, J.L.;Bischoff, P.
    • Steel and Composite Structures
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    • v.9 no.5
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    • pp.397-418
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    • 2009
  • Eight panel specimens were tested in one-way bending to study the behaviour and capacity of composite slab joists consisting of cold-formed steel C-sections and concrete. Various shear transfer mechanisms were implemented on the C-section flange embedded in the concrete to provide the longitudinal shear resistance. Results showed that all specimens reached serviceability limit state while in elastic range and failure was ductile. Shear transfer achieved for all specimens ranged from 42 to 99% of a full transfer while specimens employed with shear transfer enhancements showed a greater percentage and therefore a higher strength compared with those relying only on surface bond to resist shear. The implementation of pre-drilled holes on the embedded flange of the steel C-section was shown to be most effective. The correlation study between the push-out and panel specimens indicated that the calculated moment capacity based on shear transfer resistance obtained from push-out tests was, on average, 10% lower than the experimental ultimate capacity of the panel specimen.

Study on the Transvers Step Application Location of High Speed Planning Hull by Numerical Analysis (수치해석을 통한 고속활주선의 횡방향 Step적용 위치에 관한 연구)

  • Kim, Byung-Jae;Kim, Sang-Won;Park, Geun-Hong;Lee, Gyoung-Woo;Cho, Dae-Hwan;Seo, Kwang-Cheol
    • Proceedings of the Korean Institute of Navigation and Port Research Conference
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    • 2017.11a
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    • pp.234-235
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    • 2017
  • In order to improve the frictional resistance of existing high-speed planning hull, a step-like linear transformation has been researched which forms an air layer on the bottom. However, there is a lack of research on the proper position to confirm the effect of Running Attitude and step on each position. In this study, we confirmed the change of the Running Attitude, the effect of the step and the change of the frictional resistance when the step was applied in the longitudinal location.

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Characteristics of thin-film type pressure sensors for high pressure (고압용 박막형 압력센서의 특성)

  • 서정환;최성규;정찬익;류지구;남효덕;정귀상
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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    • 2001.07a
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    • pp.737-740
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    • 2001
  • This paper describes the fabrication and characteristics of CrN thin-film type pessure sensors, which the sensing elements were deposited on SUS. 630 diaphragm by DC reactive magnetron sputtering in an argon-nitride atmosphere(Ar-(10%)N$_2$). The optimized condition of CrN thin-film sensing elements was thickness range of 3500${\AA}$ and annealing condition(300$^{\circ}C$, 3 hr) in Ar-10 %N$_2$deposition atmosphere. Under optimum conditions, the CrN thin-films for strain gauges is obtained a high resistivity, $\rho$=1147.65 ${\mu}$$\Omega$cm, a low temperature coefficient of resistance, TCR=-186 ppm/$^{\circ}C$ and a high temporal stability with a good longitudinal, 11.17. The output sensitivity of fabricated CrN thin-film type pressure sensors is 2.36 mV/V, 4∼20 mA and the maximum non-linearity is 0.4 %FS and hysteresis is less than 0.2 %FS.

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Development of Flight Control Laws for the T-50 Advanced Supersonic Jet Trainer

  • Kim, Chong-Sup;Hur, Gi-Bong;Hwang, Byung-Moon;Cho, In-Je;Kim, Seung-Jun
    • International Journal of Aeronautical and Space Sciences
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    • v.8 no.1
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    • pp.32-45
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    • 2007
  • The T-50 advanced supersonic jet trainer employs the Relaxed Static Stability (RSS) concept to improve the aerodynamic performance while the flight control system stabilizes the unstable aircraft and provides adequate handling qualities. The T-50 flight control laws employ a proportional-plus-integral type controller based on a dynamic inversion method in longitudinal axis and a proportional type controller based on a blended roll system with simple roll rate feedback and beta-betadot feedback system. These control laws are verified by flight tests with various maneuver set flight envelopes and the control laws are updated to resolve flight test issues. This paper describes several concepts of flight control laws used in T-50 to resolve those flight test issues. Control laws for solving the roll-off problem during pitch maneuver in asymmetric loading configurations, improving the departure resistance in negative angle of attack conditions and enhancing the fine tracking performance in air-to-air tracking maneuvers are described with flight test data.

Development of a High Temperature and Exactitude Pressure Sensors for Superior Environmental Characteristics (내환경성이 우수한 고온.고정밀용 압력센서의 개발)

  • 서정환;백명숙;임창섭
    • Proceedings of the Korean Society of Marine Engineers Conference
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    • 2002.05a
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    • pp.13-22
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    • 2002
  • This paper presents characteristics of CrOx thin-film Strain gauge pressure sensors, which were deposited on SUS630 diaphragm by DC reactive magnetron sputtering in an argon-Oxide atmosphere(Ar-(10%)$O_2$). The optimized condition of CrOx thin-film strain gauges were thicknessrange of 2500$\AA$ and annealing condition ($350^{\circ}C$, 3 hr) in Ar-10 %$O_2$deposition atmosphere. Under optimum conditions, the CrOx thin-films for strain gauge is obtained a high resistivity, $\rho$=156.7$\mu$$\Omega$cm, a low temperature coefficiect of resistance, TCR=-86 ppm/$^{\circ}C$ and a high temporal stability with a good longitudinal, 15. The output sensitivity of pressure sensor obtained is 2.46㎷/V and the maximum non-linearity is 0.3%FS and hysteresis is less than 0.2%FS. The output characteristics of pressure transmitter obtained is 4~20㎃ and total accuracy is less than $\pm$0.5%FS. In those conclusions, CrOx thin film pressure sensors is quite satisfactory for many applications in industrial electronics.

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Experimental Investigation on Dynamic Behavior of Steel Fiber Reinforced Concrete Structures (강섬유콘크리트구조물의 다양한 동적거동에 관한 실험적 연구)

  • Kang, Bo-Soon
    • Journal of the Korean Society for Railway
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    • v.13 no.4
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    • pp.431-439
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    • 2010
  • In this paper, dynamic behavior of steel fiber reinforced concrete(SFRC) by experimental method is discussed. Because of its improved ability to dissipate energy, impact resistance and fatigue behavior, SFRC has a better dynamic behavior than that of plain concrete. Dynamic behavior is influenced by longitudinal reinforcement ratio, volume and type of steel fiber, strength of concrete and the stress level. Impact resistance and fatigue behavior in the SFRC has been evaluated from dynamic experimental test data at various levels of cracked states in the elements.

Fabrication of Tantalum Nitride Thin-Film as High-temperature Strain Gauges (고온 스트레인 게이지용 질화탄탈박막의 제작)

  • Kim, Jae-Min;Choi, Sung-Kyu;Nam, Hyo-Duk;Chung, Gwiy-Sang
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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    • 2001.11b
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    • pp.97-100
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    • 2001
  • This paper presents the characteristics of Ta-N thin-film strain gauges as high-temperature strain gauges, which were deposited on Si substrate by DC reactive magnetron sputtering in an argon-nitrogen atmosphere(Ar-(4~16%)$N_2$). These films were annealed for 1 hour in $2{\times}10^{-6}$ Torr vaccum furnace range $500\sim1000^{\circ}C$. The optimized conditions of Ta-N thin-film strain gauges were annealing condition($900^{\circ}C$, 1 hr.) in 8% $N_2$ gas flow ratio deposition atmosphere. Under optimum conditions, the Ta-N thin-films for strain gauges is obtained a high resistivity, $\rho=768.93$ ${\mu}{\Omega}cm$, a low temperature coefficient of resistance, TCR=-84 ppm/$^{\circ}C$ and a high temporal stability with a good longitudinal gauge factor, GF=4.12.

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Extremely large-area travelling-wave dielectrophoresis microbead separator using a multilayered bus bar (다층 버스 바를 이용한 극한 면적의 진행파 유전영동 미세입자 분류기)

  • Choi, Eun-Pyo;Kim, Byung-Kyu;Park, Jung-Yul
    • Journal of Sensor Science and Technology
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    • v.18 no.2
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    • pp.139-146
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    • 2009
  • A Multilayered microelectrode design is presented for large area travelling wave dielectrophoresis (TwDEP) separators. Most of typical TwDEP chip has been arrayed with 1000 electrodes in $20{\times}20\;mm^2$. However, there is a limitation of the device area that is critical in throughput, because when the area of TwDEP becomes larger, the resistance of microelectrodes for bus bar is also increased. In this paper, we successfully developed a novel TwDEP chip with extremely large area ($31{\times}25\;mm^2$) by a unique multilayered bus bar design. According to the resistance simulation of our microelectrodes, it is possible to realize a TwDEP chip with an infinite longitudinal length. We demonstrated the feasibility of our suggestion with latex microbeads and showed the potential of extremely high throughput separation with TwDEP technique.

A Computational Method of Wave Resistance of Ships in Water of Finite Depth (유한수심에서의 조파저항계산에 관하여)

  • S.J. Lee
    • Journal of the Society of Naval Architects of Korea
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    • v.29 no.2
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    • pp.66-72
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    • 1992
  • A computational method of the Michell integral for water of finite depth is developed and the method makes use of the expansion of the hull form by the Legendre polynomial in both the longitudinal and the vertical directions. The wave resistance coefficient is given as a quadruple summation of the product of the shape factor and the hydrodynamic factor. The shape factor depends only upon the geometry of the hull form, and the hydrodynamic factor upon the depth-based Froude number and the ratios of the water depth and the draft to the ship length. Example calculations are done for the Wigley parabolic hull and the Series 60 $C_B$ 0.6, and the comparison of our results with the existing experimental data is shown.

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Numerical Analysis of Ship Local Resistance (선체 국소 저항 수치 해석)

  • Park, Dong-Woo;Seo, Jang-Hoon;Yoon, Hyun-Sik;Chun, Ho-Hwan;Jung, Jae-Hwan;Kim, Mi-Jeong
    • Journal of Ocean Engineering and Technology
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    • v.26 no.6
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    • pp.74-79
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    • 2012
  • The present study aims at suggesting the systematic approach to analyze the local drag components as the resistance performance characterized by the flow of the ship. In order to identify the local areas, the hull surface is decomposed into SVM (Station-Vertical Section Map) which consists of 20 stations along the longitudinal direction and 20 sections along the vertical direction (from the bottom to the waterline). Successively, on the SVM, the friction and pressure drag coefficients as the components of total drag coefficient have been analyzed for two different hull forms of Wigley and KVLCC by using CFD.