• Title/Summary/Keyword: 테이퍼

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Influence of Taper Angle on Axial Behavior of Tapered Piles in Sand (모래지반에서 테이퍼 각도가 테이퍼말뚝의 연직거동에 미치는 영향)

  • Paik, Kyu-Ho;Lee, Jun-Hwan;Kim, Dae-Hong
    • Journal of the Korean Geotechnical Society
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    • v.23 no.8
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    • pp.69-76
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    • 2007
  • Axial behavior of tapered piles is affected by taper angle, stress state of soils, soil frictional angle and pile-soil interface friction angle. In this paper, a series of model pile load tests were performed using a calibration chamber in order to investigate the effect of taper angle on the axial response of cast-in-place tapered piles in sand. According to results of the tests, as taper angle of piles increased, the shaft load capacity of piles increased but its base load capacity decreased. The unit base load capacity of piles increased with increasing taper angle for medium sand but decreased for dense sand. The ratio of shaft to total load capacity increased with increasing taper angle and with decreasing relative density of soils. The test results also showed that total load capacity per unit pile volume increased with increasing taper angle for medium sand, but it decreased for dense sand. Therefore, it can be stated that tapered piles are economically more beneficial for medium sand than for dense sand.

방전 가공을 이용한 미세 구멍 가공 시 발생하는 테이퍼 형상의 제어

  • 김동준;이상민;이영수;주종남
    • Proceedings of the Korean Society of Precision Engineering Conference
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    • 2004.05a
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    • pp.254-254
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    • 2004
  • 미세 방전 가공은 전도성 재료에 미세 구멍을 가공할 때 주로 적용되는 방법이다. 그러나 미세 방전가공을 이용하여 구멍을 가공할 때 직경이 일정한 공구를 사용하더라도 입구와 출구의 직경에는 차이가 생긴다. 구멍의 벽면과 공구사이에는 2차 방전이 발생하고 상대적으로 2차 방전의 영향을 많이 받는 입구가 출구보다 직경이 커지게 된다. 이 때문에 미세 구멍의 단면 형상은 깊이 방향으로 테이퍼가 생기게 되며, 이로 인해 진직 구멍을 가공할 수 없게 된다. 따라서 이 논문에서는 이러한 테이퍼 형상을 제거하여 진직 구멍을 가공하는 방법에 관해 연구하였다.(중략)

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Transmission characteristics of a Linear Double Rectangular Taper (구형도파관 이중선형테이터의 전송특성 해석)

  • 이상설;변찬성
    • Journal of the Korean Institute of Telematics and Electronics
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    • v.22 no.6
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    • pp.71-75
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    • 1985
  • Transmission characteristics of a linear double rectangular taper is analysed by the trans-mission matrix of the taper. The total transmission matrix of the taper is obtained by multiplication of transmission matrices of smrjll taper sections which is decided into uniform length along the taper axis. The VSWR calculated from the transmission matrix is compared with those of Johnson and Matsumaru.

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Calculation of Bearing Capacity of Tapered Drilled Shafts in Cohesionless Soils Using Shape Factor (형상계수를 이용한 사질토 지반에 타설된 테이퍼말뚝의 지지력 산정)

  • Paik, Kyu-Ho;Lee, Jun-Hwan
    • Journal of the Korean Geotechnical Society
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    • v.24 no.12
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    • pp.13-22
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    • 2008
  • Fourteen calibration ehamber tests were performed using one cylindrical and two tapered piles with different taper angles to investigate the changes of the bearing capacity of tapered piles with soil state and taper angle of piles. The results of calibration chamber tests show that the ultimate base resistance of tapered piles increases with increasing mean stress and relative density of soil. It also increases with increasing taper angle for medium sand, but with decreasing taper angle for dense sand. The ultimate shaft resistance of tapered piles increases as vertical and horizontal stresses, relative density and taper angle increase. Based on the results of model pile load tests, a new design method with shape factors for estimation of the bearing capacity of tapered piles is proposed considering the effect of soil state and taper angle on bearing capacity of tapered piles. In order to check the accuracy of predictions calculated using the new method, middle-scale field pile load tests were also conducted on cylindrical and tapered drilled shafts in clayey sand. Comparison of calculated values with measured ones shows that the new design method produces satisfactory predictions tor tapered piles.

Tapered Joint Design for Power Transmission of MW-grade Wind Turbine (MW급 풍력발전기 동력전달용 테이퍼 연결장치 설계에 관한 연구)

  • Kang, JongHun;Bae, JunWoo;On, Hanyong;Kwon, Yongchul
    • Transactions of the Korean Society of Mechanical Engineers A
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    • v.39 no.11
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    • pp.1183-1189
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    • 2015
  • This study focuses on the design of the tapered joints of a wind power turbine. The main variables of the tapered joint are the transmitted torque, shaft diameter, contact area of the tapered ring, and tightening torque of the bolts, which applies a compressive pressure from the hub to the shaft. The stress distribution of the taper fit was calculated under axisymmetric plane strain conditions because of the small taper angle. The axial displacement of the clamp can be calculated from the radial elastic deformation and the taper angle. The stress field of each ring is obtained from the cylinder stress equation. To verify the accuracy of the calculation, finite element (FE) analysis was performed, and the results of the calculation and FE analysis were compared. The hoop stress of the tapered surface showed a discrepancy of approximately 10, but the trends of the stress distributions of each component and the relative movement obtained by FE analysis were in good agreement with the analytical calculation results.

Design and Performance Evaluation of IR-UWB Tapered Slot Antenna for Optimum Impulse Radio Radiation (임펄스 신호 방사를 위한 IR-UWB용 테이퍼 슬롯 안테나 설계 및 성능평가)

  • Kim, Jong-Min;Koh, Young-Mok;Ra, Keuk-Whan
    • The Journal of The Korea Institute of Intelligent Transport Systems
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    • v.11 no.5
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    • pp.103-115
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    • 2012
  • In this paper, design and performance evaluation of Tapered Slot Antenna for IR-UWB which propagates impulse radio is performed. TSA which has directional characteristic in UWB band should have low radiation loss and minimized impulse radiation distortion. In order to achieve these objectives, the paper designed wide band Impedance transformer and microstrip-slotline transit region structured TSA feeder line. By using the fabricated TSA, the radiation pattern was measured in the radio anechoic chamber. Pulse fidelity and distortion equation was induced to evaluate time domain characteristics according to the impulse radiation. Pulse fidelity of Impulse radiation show favorable results more than 93% within ${\pm}30^{\circ}$ beam width.

Design of Tapered Slot Antenna for UWB Communications (UWB 통신을 위한 테이퍼드 슬롯 안테나 설계)

  • Kim, Sun-Woong;Choi, Dong-You
    • Smart Media Journal
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    • v.4 no.4
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    • pp.64-69
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    • 2015
  • In this paper, we have proposed a tapered slot antenna for UWB communication system. The tapered slot antenna has directional radiation and broad bandwidth. Proposed tapered slot antenna is designed using Ansys Inc. HFSS and its VSWR, return los, and radiation pattern is analyzed. Operating band of the antenna were satisfied -10 dB S11 and $VSWR{\leq}2$ in 2.7 ~ 4.8 GHz band. The radiation pattern of the antenna is showed in E-plane (YZ plane) and the H-plane (XZ plane) and the highest gain of 7.3 dBi is seen at 4.5 GHz. Therefore, proposed tapered slot antenna has wide bandwidth characteristic and directional for location awareness.

Transmission Characteristics Analysis of Digital Pulse Signal on Tapered Microstrip Line in Time Domain (테이퍼형 마이크로 스트립 선로에서 디지털 펄스 신호의 시간 영역 전송 특성 해석)

  • Kim, Gi-Rae
    • Journal of the Korean Institute of Telematics and Electronics D
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    • v.36D no.8
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    • pp.1-6
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    • 1999
  • The only transmission characteristics in frequency domain is considered when using the tapered transmission line for wide-band impedance matching in MCM and MIC designs. In this paper, the distortion of an electrical pulse with rise/fall time resulting from dispersion and reflection as it propagates along a tapered microstrip line is investigated, and the delay time and distortion rate with respect to input and load impedances are analyzed on triangular and exponential tapered lines. A dispersion model of the phase constant proposed by Kirschning-Jansen is used to meet the frequency, accuracy and microstrip parametric requirements. The triangular tapered line shows both shorter delay time and higher distortion rate than those of the exponential tapered line. Furthermore, the amplitude of signal reflected from load point is calculated in time domain.

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A Study of the method designing the cylindrical-taper section coil spring (등반경-테이퍼 소재 코일 스프링의 설계 방법 연구)

  • 최선준;권혁홍
    • Proceedings of the Korean Society of Precision Engineering Conference
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    • 1996.11a
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    • pp.877-881
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    • 1996
  • 승용차나 소형승합차에는 현가장치의 스프링으로 코일스프링을 많이 사용하고 있으며 최근 들어 승차감의 상을 위해 변위의 증가와 함께 스프링 정수가 증가하는 경화 특성 스프링(hardening type spring)을 많이 채택하고 있는데, 이 특성을 나타낼 수 있는 방법 중 하나가 등반경-테이퍼 소재의 코일스프링이다. 이 논문에서는 주어진 차량조건으로부터 이상적인 스프링 특성곡선을 계산하고 이 곡선을 분할하여 직선의 연결로 근사시켜 분할한 수만큼의 직선적 특성의 스프링으로 직렬 연결되어 있다고 가정하여 이 곡선에 근접된 특성을 가지는 등반경-테이퍼 소재 코일 스프링의 설계방법을 제시하고자 한다.

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A Study of Dispersion Relation for Tapertype Slow Wave Structure (테이퍼형 지파 도파관의 분산관계 연구)

  • Kim, Jeong-Man;Kim, Won-Sop
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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    • 2007.06a
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    • pp.466-467
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    • 2007
  • 고주파 전자계에서 플라즈마 가열을 하기 위하여 긴 파장의 펄스를 발생시키는 것이 중요한 데 마이크로파의 발진을 안정시키기 위하여 테이퍼형 지파 도파관을 연계하여 분산관계를 연구하였다.

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