• Defense and Technology
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• no.2 s.156
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• pp.30-35
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• 1992

현대의 어뢰는 함정의 회피운동만으로는 대처하기 곤란하며, 차폐, 방해, 기만등으로 어뢰에 대항하는 방법과 저소음화, 피채율 감소 등으로 상대방이 탐지하지 못하게 하는 방법이 있다. 어뢰공격으로부터 함정을 보호하기 위해 영국, 프랑스, 이스라엘 등은 음향대항전 체계를 개발해사용하고 있으나, 이에 관련된 기술은 매우 신중히 보호하고 있으며 노출시키지않고 있다. 이 음향대항전 체계는 주문구매가 가능하나 극비에 속하는 자국함정의 음향징표를 제작국에 제시해야 하므로, 상호 기밀을 유지할수 없는 현실을 감안할때, 이 분야는 독자개발이 바람직하다 하겠다

• Journal of Advanced Marine Engineering and Technology
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• v.18 no.2
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• pp.18-24
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• 1994

거의 모든 무기체계에서의 추진이 차지하는 비중은 다른 어떤 분야보다도 기본적이고 중요하다고 판단된다. 특히 어뢰의 경우는 추진 분야가 차지하는 비중은 전기추진식의 경우 공간적, 중량적인 측면에서 거의 50% 이상을 차지하고 있는 것을 볼때 그 중요성은 더욱더 크다고 할 수 있다. 이러한 점들을 고려하여 여기에서는 어뢰 추진체계로서 현재 사용되고 있는 추진체계를 중심으로 전 세계적으로 연구, 운용되고 있는 추진체계에 대해 알아보고자 한다.

• Journal of the Korea Society for Simulation
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• v.23 no.2
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• pp.7-15
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• 2014

System operational performance analysis for wire-guided torpedo is intended to provide technical analysis data for requirements analysis and development, which, as a consequence, supports the requirements definition activity for systems engineering. Technical approach and analysis example are presented including problem definition, formulation, modeling, simulation and analysis results that are applied to the on-going Next Generation Torpedo project.

• Journal of the Korea Society for Simulation
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• v.16 no.3
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• pp.19-28
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• 2007

We considered the authoritative representations of torpedo systems that was the engagement level model to develop system specifications and to analyze operational requirements on concept design phase. The Work Breakdown Structure(WBS) of models was defined about authoritative representations of the torpedo systems. The communication of information among each subsystems and input/output parameters were defined. In the heavy weight and light weight torpedo model, presetter, underwater maneuver, war head, sonar, guidance and control, propulsion subsystem modeling were developed for heavy-weight and the light-weight torpedo systems. The authoritative representations of torpedo systems have similar structures with those of the engineering level models and could be verified via engagement level simulations according to the V&V process in the future.

• Journal of the Korea Society for Simulation
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• v.20 no.4
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• pp.1-11
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• 2011

In the development phase of a torpedo, the effectiveness analysis is carried out to predict the performance and to learn how to use the torpedo. In order to obtain reliable data, it is required to model the tactical situation closely to the actual one. Because the submarine is a target of a lightweight torpedo, the anti-torpedo countermeasures of a submarine such as evasive maneuvering and TACM (Torpedo Acoustic Counter Measure) should be modeled in detail. In this paper, the evasive maneuvering is modeled reflecting the movement characteristics of the submarine. Furthermore various TACMs such as a floating-type decoy, a self-propelled decoy and jammers are also modeled. Then, effectiveness of a lightweight torpedo is measured and analyzed using the simulation program which is developed through the above modeling procedure.

• Journal of the Korea Society for Simulation
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• v.27 no.1
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• pp.33-38
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• 2018

This paper introduces the simulation concepts and technical approach of wire-guided torpedo performance analysis simulator, as a consequence, provide a framework for understanding overall attack procedures and effectiveness of tactics to torpedo operator. It described the mathematical models of simulation components and weapon engagement principle, especially it derived the closed-form solution of time consumption and leading angle problem of torpedo attack situation based on geographical assumption. In addition, it adopted the proportional navigation guidance at final stage of torpedo attack and also consider the tradeoff relation between target ship speed(propeller noise level) and detection probability, so that it improves the fidelity of physical realism. Simulator is developed with high degree of freedom in the perspective of tactical situation, and it helps user to understand the overall situation and tactical effectiveness.

• Explosives and Blasting
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• v.37 no.3
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• pp.13-24
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• 2019

This paper was prepared to investigate the behavior of fragments in underwater torpedo explosion beneath a frigate or surface ship by using an explicit finite element analysis. In this study, a fluid-structure interaction (FSI) methodology, called the multi-material arbitrary Lagrangian-Eulerian (MM-ALE) approach in LS-DYNA, was employed to obtain the responses of the torpedo fragments and frigate hull to the explosion. The Euler models for the analysis were comprised of air, water, and explosive, while the Lagrange models consisted of the fragment and the hull. The focus of this modeling was to examine whether a worst-case fragment could penetrate the frigate hull located close (4.5 m) to the exploding torpedo. The simulation was performed in two separate steps. At first, with the assumption that the expanding skin of the torpedo had been torn apart by consuming 30% of the explosive energy, the initial velocity of the worst-case fragment was sought based on a well-known experimental result concerning the fragment velocity in underwater bomb explosion. Then, the terminal velocity of the worst-case fragment that is expected to occur before the fragment hit the frigate hull was sought in the second step. Under the given conditions, the possible initial velocities of the worst-case fragment were found to be very fast (400 and 1000 m/s). But, the velocity difference between the fragment and the hull was merely 4 m/s at the instant of collision. This result was likely to be due to both the tremendous drag force exerted by the water and the non-failure condition given to the frigate hull. Anyway, at least under the given conditions, it is thought that the worst-case fragment seldom penetrate the frigate hull because there is no significant velocity difference between them.

• Defense and Technology
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• no.7 s.19
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• pp.25-31
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• 1980

• Defense and Technology
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• no.10 s.164
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• pp.52-57
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• 1992

• Defense and Technology
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• no.11 s.189
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• pp.54-63
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• 1994