Structural response and optimization of a supercavitating torpedo

Alyanak, Edward J.; Venkayya, V. B.; Grandhi, Ramana V.; Penmetsa, Ravi

doi:10.1016/j.finel.2004.10.005

Cited by 21 publications

(17 citation statements)

References 5 publications

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“…This paper addresses this issue, and therefore extends previous investigations performed by one of the authors [7,8]. The structural optimization of supercavitating torpedoes is also investigated in [9], where stiffened configurations were optimized to maximize static, dynamic, and buckling performance of a notional torpedo.…”

Section: Introductionmentioning

confidence: 60%

“…3, where all nodal degrees of freedom are fixed. This set of boundary conditions, which facilitates the evaluation of the buckling stresses contained in 0 , is similar to those considered in [9], and represents a close approximation to reality in the specific case of static or quasi-static loads as considered here.…”

Section: Description Of Buckling Forces and Boundary Conditionsmentioning

confidence: 99%

See 1 more Smart Citation

Optimal design of cylindrical shells for enhanced buckling stability: Application to supercavitating underwater vehicles

Ahn¹,

Ruzzene²

2006

Finite Elements in Analysis and Design

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Section: Introductionmentioning

confidence: 60%

Section: Description Of Buckling Forces and Boundary Conditionsmentioning

confidence: 99%

Optimal design of cylindrical shells for enhanced buckling stability: Application to supercavitating underwater vehicles

Ahn¹,

Ruzzene²

2006

Finite Elements in Analysis and Design

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“…최근 어뢰의 개발 추세를 보면, 기존 음향 추적 어뢰 (Acoustic Homing Torpedo)가 음향 기만기에 기만되는 단점을 보완하기 위하여 표적이 생성하는 항적을 추적하 는 항적 추적 어뢰(Wake Homing Torpedo)가 개발되고 있다 (Friedman, 1994;Ku et al, 2009;Lee et al, 2010). 또한 어뢰의 진행방향 앞쪽을 진공 상태로 만들어 어뢰 의 속도가 급속히 증가되도록 하는 초공동어뢰 (Supercavitating Torpedo)의 개발 또한 보고되고 있다 (Alyanak, 2005). 이러한 어뢰의 개발은 수중에서의 효과 적인 방어를 더욱 어렵게 하고 있으며, 이를 보완하기 위 한 수중방어체계의 개념적, 기술적인 발전과 더불어 운용 상의 전술적 개발 또한 함께 진행되고 있다.…”

Section: 서론unclassified

Effectiveness Analysis for Survival Probability of a Surface Warship Considering Static and Mobile Decoys

Shin¹,

Cho²,

Lee³

et al. 2016

Journal of the Korea Society for Simulation

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We consider simulation study combining static and mobile decoys for survivability of a surface warship against torpedo attack. It is assumed that an enemy torpedo is a passive acoustic homing torpedo and detects a target within its maximum target detection range and search beam angle by computing signal excess via passive sonar equation, and a warship conducts an evasive maneuvering with deploying static and mobile decoys simultaneously to counteract a torpedo attack. Suggesting the four different decoy deployment plans to achieve the best plan, we analyze an effectiveness for a warship's survival probability through Monte Carlo simulation, given a certain experimental environment. Furthermore, changing the speed and the source level of decoys, the maximum torpedo detection range of warship, and the maximum target detection range of torpedo, we observe the corresponding survival probabilities, which can provide the operational capabilities of an underwater defense system.

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“…In real applications, to employ supercavitation for drag reduction, rocket propulsion usually has to be used for sustained operation, such as the Russian VA-111 Shkval supercavitating torpedo [2]. In addition, this can be achieved temporarily by an underwater projectile fired or an airborne projectile impacting the water [110,111]. Therefore, the current applications of supercavitation are mainly limited to projectiles or very fast torpedoes and some propellers.…”

Section: Passive Gas Generation For Drag Reductionmentioning

confidence: 99%

Underwater drag reduction by gas

Wang

Chen

2014

Friction

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Publications on underwater drag reduction by gas have been gathered in the present study. Experimental methods, results and conclusions from the publications have been discussed and analyzed. The stable existence of gas is a requirement for underwater drag reduction induced by slippage at the water-solid interface. A superhydrophobic surface can entrap gas in surface structures at the water-solid interface. However, many experimental results have exhibited that the entrapped gas can disappear, and the drag gradually increases until the loss of drag reduction with immersion time and underwater flow. Although some other surface structures were also experimented to hold the entrapped gas, from the analysis of thermodynamics and mechanics, it is difficult to prohibit the removal of entrapped gas in underwater surface structures. Therefore, it is essential to replenish a new gas supply for continued presence of gas at the interface for continued underwater drag reduction. Active gas supplement is an effective method for underwater drag reduction, however, that needs some specific equipment and additional energy to generate gas, which limits its practical application. Cavitation or supercavitation is a method for passive gas generation, but it is only adaptive to certain vehicles with high speed. Lately, even at low speed, the evaporation induced by liquid-gas-solid interface of a transverse microgrooved surface for continued gas supply has been discovered, which should be a promising method for practical application of underwater drag reduction by gas.

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Structural response and optimization of a supercavitating torpedo

Cited by 21 publications

References 5 publications

Optimal design of cylindrical shells for enhanced buckling stability: Application to supercavitating underwater vehicles

Optimal design of cylindrical shells for enhanced buckling stability: Application to supercavitating underwater vehicles

Effectiveness Analysis for Survival Probability of a Surface Warship Considering Static and Mobile Decoys

Underwater drag reduction by gas

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