• Title, Summary, Keyword: 수중운동체

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Measurement of Performance of High Speed Underwater Vehicle with Solid Rocket Motor(II) (로켓추진을 이용한 고속 수중운동체의 수중 주행성능 측정 결과(II))

  • Yoon, Hyun-Gull;Lee, Hoy-Nam;Cha, Jung-Min;Lim, Seol;Suh, Suhk-Hoon
    • Journal of the Korean Society of Propulsion Engineers
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    • v.22 no.4
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    • pp.12-17
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    • 2018
  • A natural cavitation-type high-speed underwater vehicle with solid rocket motor is tested, and its speed and running distance are measured. The outputs from pressure sensors on the surface of the vehicle reveal a pressure-time history reflecting the development of supercavitation. Underwater cameras installed on the wall of the test pool record the entire process from the onset of supercavitation to its full development. CNU-SuperCT, based on two-dimensional inviscid theoretical analysis, is used to simulate test results. Considering CNU-SuperCT does not include the control fins of the vehicle, simulation results agree with test results very well. Additionally, pictures from underwater cameras support the test results.

Measurement of Performance of High Speed Under Water Vehicle by Using Solid Rocket Motor(II) (로켓추진을 이용한 고속 수중운동체의 수중 주행성능 측정 결과(II))

  • Yoon, Hyun-Gull;Lee, Hoy-Nam;Cha, Jung-Min;Lim, Seol;Suh, Suhk-Hoon
    • Proceedings of the Korean Society of Propulsion Engineers Conference
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    • pp.131-136
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    • 2017
  • High speed under water vehicle by using solid rocket motor, which is a natural cavitation type, was tested. The vehicle's speed and running distance was measured, and pressure sensors installed on the surface of the vehicle show pressure-time history of pressures according to the development of the supercavitation. Underwater cameras installed on the wall of the test pool recorded whole processes from the onset of the supercavitation to fully developed one. CNU-SuperCT based on 2-dimensional inviscid theoretical analysis was used to simulate the test result. In consideration of CNU-SuperCT does not include the control fins of the vehicle, simulation results agree with test results very well. Also, pictures from underwater cameras support the test results.

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Research on the Oblique Towing Test of the Manta Type UUV. (만타형 수중운동체의 사항시험에 관한 연구.)

  • Lee, Seung-Keon;Sohn, Kyung-Ho;Lee, Sang-Eui;Hwang, Sung-Jun;Seo, Jung-Ho
    • Proceedings of the Korean Institute of Navigation and Port Research Conference
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    • pp.63-68
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    • 2005
  • In this paper, 6-DOF motion equations of UUV (Unmanned Undersea Vehicles) are derived Moreover, the hydrodynamic maneuvering derivatives are found from the oblique towing tests of the 2m Manta type UUV model.

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A Study on the Oblique Towing Test of the Manta Type UUV. (만타형 수중운동체의 사항시험에 관한 연구)

  • Lee Seung-Keon;Sohn Kyung-Ho;Lee Sang-Eui;Hwang Sung-Jun;Seo Jung-Ho
    • Journal of Navigation and Port Research
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    • v.29 no.8
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    • pp.679-684
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    • 2005
  • In this paper, 6-DOF motion equations of UUV (Unmanned Undersea Vehicles) are derived Moreover, the hydrodynamic maneuvering derivatives are found from the oblique towing test of the 2m Manta type UUV model.

Horizontal Stability Estimation of Underwater Vehicle Using Rotating Arm Test (강제선회시험을 이용한 수중운동체의 수평면 안정성 평가에 관한 연구)

  • Han, Ji-Hun;Jeong, Jeong-Jae;Lee, Seung-Bum;Jang, Geun-Young;Lee, Seung-Keon
    • Proceedings of the Korean Institute of Navigation and Port Research Conference
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    • pp.110-112
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    • 2016
  • In this paper, the captive model test of submerged body using RA test was carried out at the Square Basin. The target model is a submarine with four different types. For the comparison between theory and measurement, hydrodynamic coefficients are calculated according to the described method and compared with RA measurements on Submarine models. in addition, horizontal stability index of underwater vehicle was checked.

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Hull Form Definition of Underwater Vehicle using NURBS Curve (NURBS곡선을 이용한 수중운동체의 선형정의)

  • Hyun-Cheol Kim;Seon-Sik Pyo;Soo-Young Kim
    • Journal of the Society of Naval Architects of Korea
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    • v.32 no.2
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    • pp.1-9
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    • 1995
  • This paper suggests a numerical method that creates and varies hull form geometry of underwater vehicle. That is, it induces the cylindrical underwater vehicle from principal dimensions-total length, the length of parallel middle body, the coefficient defining entrance & run parts etc.-and represents using NURBS curve. Also, each section of hull form is varied by user interface and Sectional Area Curve is generated.

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A Study on Numerical Simulation for Predicting of Unmanned Undersea Vehicle's Manoeuvrability (수중운동체의 조종성능 예측을 위한 수치시뮬레이션에 대한 연구)

  • Bae, Jun-Young
    • Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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    • pp.83-85
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    • 2015
  • The Purpose of this paper was to carry out basic study on development of real-time submarine-hnadling simulator. The author adopt the Unmanned Undersea vehicle(UUV), which has taken the shape of manta[1]. They call here it Unmanned Undersea Vehicle(UUV). UUV is based on the same design concept as UUV called Manta Test Vehicle, which was originally built by the Naval Undersea Warfare Center, USA[1]. The present study deals with prediction of manoeuvring motion of UUV at general drift angles and large drift angles. The dynamic mathematical model with six degrees of freedom is revised and supplemented in order to describe accurately motion of UUV. The hydrodynamic derivatives related to motion are obtained from previous work[2].

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수상 및 수중운동체의 로버스트 안정성 해석 및 안정화에 관한 연구

  • Kim, Yeong-Bok;Ji, Sang-Won;Phuoc, Bui Van
    • Proceedings of the Korean Institute of Navigation and Port Research Conference
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    • pp.8-9
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    • 2011
  • 본 논문에서는 수상 및 수중운동체의 안정성 및 안정화기법에 관해 고찰한다. 선박이 운동을 하게 되면 부가질량이 변하게 되고 대칭인 시스템행렬이 비대칭이 된다. 비대칭성에 따라 시스템의 안정성해석방법도 달라지는데 예를 들어 가속도 피드백을 통해 비대칭요소를 제거하여 대칭으로 변환시키는 것이 가장 대표적인 해석 및 안정화 기법이다. 시스템 모델자체는 어디까지나 모델이기 때문에 대상시스템을 명확하게 수식으로 표현할 수 없으므로 피드백에 의한 비대칭요소를 소거시키는 방법은 타당하지 못하다. 따라서 본 논문에서는 대칭행렬이 비대칭행렬로 변하는 제약에 구애받지 않는, 보다 일반성을 갖는 안정성해석법을 제안한다.

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Experimental Study on the Characteristics of Turbulent Wall Pressure Fluctuation Over Compliant Coatings (유연재 코팅 평판의 난류 변동압력 특성에 관한 실험적 연구)

  • Park, Kyung-Hoon;Lee, Seung-Jae;Shin, Ku-Kyun
    • The Journal of the Acoustical Society of Korea
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    • v.26 no.6
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    • pp.293-300
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    • 2007
  • Turbulent boundary layer over an underwater vehicle is formed when it moves underwater and wall pressure fluctuation within the turbulent boundary layer generates flow-induced noise by exciting the elastic hull of the underwater vehicle. One of the methods to reduce this flow noise is to attach a compliant layer on the surface of the vehicle. In order to observe the possibility of noise reduction in the water when the compliant layer treatments are applied on the surface, three types of specimens those are a bare steel plate, a steel plate coated with neoprene and a steel plate with polyurethane coating material are tested at various flow speeds in a low noise cavitation tunnel. This paper presents the results of measurements and analysis of wall pressure fluctuations which is a main source of flow noise, within the turbulent boundary layer on three specimens. Its results could be shown that about 10dB reduction of wall fluctuation pressure at high frequencies was achieved due to the dissipation of turbulent energy by the compliant coating while it makes the turbulent boundary layer thicker and changes the behavior of turbulent flow in the layer.