• Title, Summary, Keyword: Triangular Bar Type

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A Study on Flow Characteristics of a Separate Triangular Bar Differential Pressure Flow Meter for Measuring Exhaust Flow Rate of Diesel Engine (디젤엔진 배기 가스 유량 측정용 삼각 분리 막대형 차압유량계 유량 특성 연구)

  • Lee, Choong-Hoon;Kim, Kwang-Il;Kim, Min-Chang;Park, Dong-Sun
    • Journal of the Korean Society for Railway
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    • v.10 no.5
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    • pp.563-568
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    • 2007
  • A separate triangular bar type differential pressure flow meter was developed for measuring exhaust gas flow rate from Diesel engine. Three kinds of the separate triangular bar flow meters whose aerodynamic angles are different one another are made and evaluated, respectively. The experimental results show that an aerodynamic shape has a effect on the pressure difference between upstream and downstream at the flow meter, that is, the thinner the shape of the separate triangular bar flow meter is, the smaller the pressure difference at the flow meter is. The separate triangular bar type flow meter was calibrated at both cold and high temperature of the gas flow. A burner system was designed for raising the gas temperature and it was well operated in controlling the gas temperature. An empirical correlation between mass flow rate and differential pressure at the separate triangular bar flow meter was obtained and the empirical correlation was also corrected by the gas temperature.

A Study on Avoiding Collision between a Ship and Bridge and Minimizing Damages if Unavoidable (선박과 교량의 충돌예방과 충돌시 손상의 감소방법에 관한 연구)

  • Yoon, Byoung-Won;Yun, Jeom-Dong
    • Proceedings of the Korean Institute of Navigation and Port Research Conference
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    • pp.376-382
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    • 2007
  • A Collapse of bridge by ship's collision to the bridge post may lead a great calamity. This paper investigates on avoiding collision between a ship and bridge by improvement of environmental factors, submitting a counter plan of reducing collision effect by triangular type of collision protecting bar and ship maneuvering skills. Putting up collision protecting bar fences of triangular type around the bridge posts would decrease the collision impact force by 75 percent.

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Development of miniature bar-type structural fuses with cold formed bolted connections

  • Guan, Dongzhi;Yang, Sen;Jia, Liang-Jiu;Guo, Zhengxing
    • Steel and Composite Structures
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    • v.34 no.1
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    • pp.53-73
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    • 2020
  • A novel all-steel miniature bar-type structural fuse (MBSF) with cold formed bolted connections is developed in this study, which consists of a central energy dissipation core cut from a smooth round bar, an external confining tube and nuts. Three types of cross sections for the central energy dissipation core, i.e., triple-cut, double-cut and single-cut cross sections, were studied. Totally 18 specimens were axially tested under either symmetric or asymmetric cyclic loading histories, where the parameters such as cut cross sectional area ratio, length of the yielding portion and cross sectional type were investigated. Numerical simulation of 2 representative specimens were also conducted. An analytical model to evaluate the bending failure at the elastic portion was proposed, and a design method to avoid this failure mode was also presented. The experimental results show that the proposed MBSFs exhibit satisfactory hysteretic performance under both the two cyclic loading histories. Average strain values of 8% and 4% are found to be respectively suitable for designing the new MBSFs as the ultimate strain under the symmetric and asymmetric cyclic loadings.

A Study on Flow Rate Characteristics of a $Annubar^{(R)}$ Type Differential Pressure Flow Meter with a Shape Improvement ($Annubar^{(R)}$형 차압유량계 형상 개선에 따른 유량 특성 연구)

  • Oh, Dae-San;Lee, Choong-Hoon
    • Journal of The Korean Society of Manufacturing Technology Engineers
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    • v.19 no.2
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    • pp.204-210
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    • 2010
  • The inner structure of the triangular separate bar (TSB) was improved to enhance the productivity of the TSB flow meter by simplifying the machining process for making the flow meter. The cross section of upstream and downstream pressure chamber in the TSB was changed from triangle to circle, which make it possible to substitute the wire cutting by drilling in the process of machining the pressure chamber. The flow rate characteristics of the flow meters was calibrated with a laminar flow meter. Six kinds of flow meters whose diameters of pressure tap for measuring pressure of both upsteam and downstream pressure chamber were different one another were made. The effects of the pressure tap diameter on the flow rate characteristics of the TSB flow meter was little. The mass flow rate characteristics of the flow meters with increasing a non-dimensional parameter which includes the gas temperature, exhaust gas pressure and differential pressure at the flow meters and atmospheric pressure shows nearly linear relationship with a correlation coefficient of R=0.998.

Design and Implementation of Single-Feed Dual-Band Circular Polarization Triangular Antenna for Reception of GPS and DMB Signals (GPS와 DMB 신호 수신을 위한 단일 급전 이중 대역 원형 편파 삼각 패치 안테나 설계 및 구현)

  • Lee, Won-Kew;Kim, Sung-Min;Yang, Woon-Gen
    • The Journal of Korean Institute of Electromagnetic Engineering and Science
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    • v.16 no.9
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    • pp.893-902
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    • 2005
  • We propose a novel single-feed triangular patch antenna with bar-type slots for dual-band circular polarization operation. And also propose a H-type slotted triangular patch antenna to enhance the ratio of the resonance frequencies. 3 cases of desist examples with bar-type slots were investigated and also 4 cases of H-slotted antennas were investigated to meet the dual-band requirement for GPS(Global Positioning System) and DMB(Digital Multimedia Broadcasting). One suitable design example was implemented and measured. Simulation results of the design example for GPS and DMB system show that axial ratio and maximum gain are 3.80 dB, 8.85 dBi for low-band at 1.575 GHz and 2.02 dB, 8.60 dBi for high-band at 2.642 GHz, respectively. Measured results of the implemented antenna show that $S_{11}$ is -12.43 dB for low-band at 1.575 GHz and less than -18.75 dB for high-band, respectively.

Comparisons of Linear Characteristic for Shape of Stator Teeth of Hall Effect Torque Sensor

  • Lee, Boram;Kim, Young Sun;Park, Il Han
    • Journal of Magnetics
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    • v.17 no.4
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    • pp.285-290
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    • 2012
  • Electric Power Steering (EPS) system is superior to conventional Hydraulic Power Steering (HPS) system in aspect of fuel economy and environmental concerns. The EPS system consists of torque sensor, electric motor, ECU (Electric Control Unit), gears and etc. Among the elements, the torque sensor is one of the core technologies of which output signal is used for main input of EPS controller. Usually, the torque sensor has used torsion bar to transform torsion angle into torque and needs linear characteristic in terms of flux variation with respect to rotation angle of permanent magnet. The torsion angle of both ends of a torsion bar is measured by a contact variable resistor. In this paper, the sensor is accurately analyzed using 3D finite element method and its characteristics with respect to four different shapes of the stator teeth are compared. The four shapes are rectangular, triangular, trapezoidal and circular type.

3D FE Analysis of Hall Effect Torque Sensor and Shape Design of Its Stator teeth (홀소자 토크센서의 3차원 유한요소해석 및 고정자 치 형상설계)

  • Lee, Bo-Ram;Kim, Young-Sun;Park, Il-Han
    • Proceedings of the KIEE Conference
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    • pp.702_703
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    • 2009
  • Electric Power Steering(EPS) system is superior to conventional Hydraulic Power Steering(HPS) system in aspect of fuel economy and environmental concerns. The EPS system consists of torque sensor, electric motor, ECU(Electric Control Unit), gears and etc. Among the elements, the torque sensor is one of the core technologies of which output signal is used for main input of EPS controller. Usually, the torque sensor has used torsion bar to transform torsion angle into torque. The torsion angle of both ends of a torsion bar is measured by a contact variable resistor. In this paper, the sensor is accurately analyzed using 3D finite element method and its characteristics with respect to four different shapes of the stator teeth are compared. The four shapes are rectangular, triangular, trapezoidal and circular type.

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Analysis of the Turbulent Heat/Fluid Flow in a Ribbed Channel for Various Rib Shapes (채널 내 주기적으로 배열된 요철 형상이 난류 유동장/온도장에 미치는 영향 연구)

  • Choi D. H.;Ryu D. N.;Han Y. S.
    • 한국전산유체공학회:학술대회논문집
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    • pp.128-133
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    • 2002
  • The heat transfer characteristics of a turbulent flow in a ribbed two-dimensional channel have been investigated numerically. The fully elliptic governing equations, coupled with a four-equation turbulence model, $\kappa-\omega-\bar{t^2}-\epsilon_t$, are solved by a finite volume method of SIMPLE type. Calculations have been carried out for three rib cross-sections : square, triangular, and semicircular, with various rib pitches and Reynolds numbers. The procedure appears to be satisfactory as the results for the square rib compare favorably with available experimental data and earlier calculation. The optimal rib pitch that yields the maximum heat transfer has been identified. It is also found that the square rib is most effective in enhancing the heat transfer. The semicircular rib, on the other hand, incurs the least amount of pressure drop but the improvement in heat transfer is substantially lower.

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