• 한국군사과학기술학회지
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• 제5권2호
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• pp.149-158
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• 2002

Static Characteristics of the system, such as weight, center of gravity etc., are inspected and regulated through the whole design process of a light weight torpedo system, and the nominal condition of the characteristics is prescribed for standardization of manufacturing and fabrication. It is possible that a real system or assembled system has different static characteristics from that of the nominal condition. It is required to evaluate the tolerance of the static characteristics within which the performance of the system should not be contaminated by the static characteristics. In this paper, an evaluation method of the tolerance is described for light weight torpedo systems. The method is to check on the performance and related critical parameters of light weight torpedoes. The checking items are composed of general conditions of underwater mobile systems such as stability and dynamic sensitivity and specified performance requirements for light weight torpedoes.

• 한국군사과학기술학회지
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• 제4권1호
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• pp.137-146
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• 2001

According to the advanced development of Light Weight Torpedo, the overall items related with the parachute type and gore layout and air stabilizer of the parachute for fixed and rotary wing aircraft are described in this paper. Also, the drag-area which should satisfy the firing envelope, parachute inflation characteristics, stability of parachute and torpedo in airdropping, water entry impact on torpedo and parachute constituted the principle design factors. The important trial and errors occurred in the step of performance of the parachute for fixed and rotary wing aircraft are investigated and analyzed.

• 한국시뮬레이션학회논문지
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• 제16권3호
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• pp.19-28
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• 2007

무기체계의 개념설계 단계에서부터 체계 사양 도출 및 관 요구분석의 효과적인 수행을 위한 교전수준(Engagement Level)의 M&S(Modeling & Simulation) 적용을 위해 수중무기체계인 어뢰체계의 표준모델을 구성하였다. 추후 수중 교전 시뮬레이션에 공통적으로 사용될 수 있도록 재사용성(Reusability)과 상호운용성(Interoperability) 및 공학 모델로의 확장성을 고려하였다. 어뢰체계의 표준에 대하여 모델의 WBS(Work Breakdown Structure)를 정의하고 각 하부 모델들 사이의 정보 흐름을 구체화하여 모델간의 입력 및 출력 파라미터를 정의하였다. 어뢰 모델링은 WBS의 하부 모델 중에서 초기입력 장치, 수중운동, 전투탄두, 음향탐지, 유도제어, 추진동력에 대해서 모델링 하였으며, 중어뢰와 경어뢰의 운용상의 차이점을 구분하여 모델링하였다. 표준모델은 가능한 공학 수준 M&S와 동일한 구조를 갖도록 하였으며 앞으로 정립될 V&V(Verification & Validation) 절차에 따라 교전 시뮬레이션에 사용될 다른 체계들과 검증될 것이다.

• 한국군사과학기술학회지
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• 제19권6호
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• pp.769-778
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• 2016

Technical approach on the modeling, simulation and experimentation methods, which are applied for developing a constructive simulation and engagement experimentation software for supporting light weight torpedo operational tactics study, is introduced. Conceptual modeling for the weapon engagement and simulation entities, mathematical models for the simulation elements, approach for the design of experimentations are described, and screen shots of the software are also presented as some example results of experimentation and analysis. It is found that the simulation and experimentation results are useful to support and fulfill the mission needs and requests. As a consequence, the technical approach is rated to be appropriate to accomplish the dedicated purpose of the simulation and experiments.

• 대한조선학회논문집
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• 제37권2호
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• pp.77-87
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• 2000

항공기나 헬기에서 투하되어 수면으로 입수하는 경어뢰에 작용하는 충격력은 경어뢰 구성부의 손상을 유발시킬 수 있으므로 투하 속도 및 투하 고도를 제한하는 조건이 된다. 따라서, 투하 조건에 따라 입수 충격을 신뢰성 있게 추정할 필요가 있다. 본 연구에서는 선수부 형상에 대한 함수로 입수 충격을 근사적으로 추정할 수 있는 방법을 제시하고, 그 결과를 수치 해석 결과와 비교하여 타당성을 검증하였다. 본 연구에서 제시된 근사화 방법으로 추정한 입수 충격의 크기나 작용시간은 포텐셜 유동이나 점성 유동 해석에 의한 결과들과 비교적 잘 일치하므로 본 연구 결과는 초기 설계 단계에서 안전 발사 영역을 선정하기 위한 기법으로 유용하게 사용될 수 있다.

• International Journal of Ocean System Engineering
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• 제3권1호
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• pp.16-21
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• 2013

This paper presents a design of fuzzy PD depth controller for the autonomous underwater vehicle entitled KAUV-1. The vehicle is shaped like a torpedo with light weight and small size and used for marine exploration and monitoring. The KAUV-1 has a unique ducted propeller located at aft end with yawing actuation acting as a rudder. For depth control, the KAUV-1 uses a mass shifter mechanism to change its center of gravity, consequently, can control pitch angle and depth of the vehicle. A design of classical PD depth controller for the KAUV-1 was presented and analyzed. However, it has inherent drawback of gains, which is their values are fixed. Meanwhile, in different operation modes, vehicle dynamics might have different effects on the behavior of the vehicle. In this reason, control gains need to be appropriately changed according to vehicle operating states for better performance. This paper presents a self-tuning gain for depth controller using the fuzzy logic method which is based on the classical PD controller. The self-tuning gains are outputs of fuzzy logic blocks. The performance of the self-tuning gain controller is simulated using Matlab/Simulink and is compared with that of the classical PD controller.