Onshore Simulation Test Setup for Temperature and Strain Sensing of Submarine Cable based on BOTDA
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The 500kV submarine cable route of Hainan Networking System starts from Nanling Village, Jiaowei Township, Xuwen County, Zhanjiang City, Guangdong Province. It crosses the Qiongzhou Strait to Linshi Village, Qiaotou Town, Chengmai County, Hainan Province. Hainan Networking System 500kV AC Submarine Cable is the first ultra-high voltage, large capacity and long-distance cross-sea networking power cable in China. It is 31 km. In this article, there are three main parts. The first part introduces the status of submarine cable monitoring and the BOTDA test principle. The second part is to design a calibration experiment to calibrate the Brillouin temperature coefficient and the Brillouin strain coefficient for the test fiber of the submarine cable. The third part is to design the spatial distribution rate verification experiment of Brillouin optical time domain reflectometry analyzer to ensure the error of equipment and experiment, so that it can be applied in submarine cable in the future.Based on the problem of on-call searching submarine of anti-submarine helicopter, the submarine's position distribution is researched and the results are proven that the position distribution submits to Rayleigh distribution in polar coordinates, and the speed of submarine also submits to Rayleigh distribution, and then the two important conclusions are obtained, that is, searching submarine based on passive sonobuoy, the first sonobuoy should be placed in the diving position of the submarine; under special conditions, the result of the search submarine of circular array is the best, followed by square, triangular, annular array. Finally, Monte Carlo method is used to verify the reasonality of the conclusion.
Rayleigh distribution
Position (finance)
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DICASS can be used to track,orientate and identify submarine under the sea,and this may be dangerous for submarine's action.Fortunately,DICASS have detecting blind areas,the submarine can use it to evade,and then break away from the anti-submarine aircraft's tracking.The detection blind areas and tracking arrays of DICASS were discussed firstly.The probability models of DICASS system tracking submarine then were established,by these mathematic model,theory calculations of tracking probability and detail feasibility analysis about submarine's elusion were done.Finally,a lot of simulations about submarine to elude DICASS were prosecuted,and according to the result of simulation,some of elusion courses and action methods of submarine in various conditions were educed.
Tracking (education)
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Efficiency of searching submarine is an important reference for evaluating the characteristic of sonobuoy array.In order to research the influence of sonobuoy arrays on the efficiency of searching submarine,the thesis gives the mathematical models of submarine movement and sonobuoy array in aerial searching submarine,according to the need of aerial antisubmarine warfare.Associating with the parameters of searching submarine,such as the number of sonobouy,range between antisubmarine bases and original submarine position,velocity of antisubmarine aircraft and movement of submarine,Monte Carlo method is used to simulate and analyze the efficiencies of searching submarine by using different sonobuoy arrays.Simulation results show that sonobuoy arrays have great difference and monolayer circular sonobuoy array has better efficiency of searching submarine,and this offers a subsidiary reference for sonar operator to optimize sonobuoy array.
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The paper discusses the motion response of submarine to trapezoid steering on the basis of the linear equation of submarine manoeuvring motion, with different composites of stability coefficients l'a、l'q and Kvd, in different submarine speed. The paper analyses the relation on stability and maneuverability and gives the suggestions of modifying the current specification and testing stability of real submarine.
Basis (linear algebra)
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CFD simulation of submarine powering performance in the numerical towing tank of CSSRC is described in detail in this paper.The computation approach for resistance,flow field and hydrodynamic forces in open-water and self-propulsion(body-propulsor interaction) conditions are defined.Meanwhile,the various computation cases for submarine powering performance are analyzed.And the prediction accuracy is presented.These models consist of fifteen bodies of revolution(series models),ten submarine models of all appendages(series models),SUBOFF model,several submarine models and propeller models for method validation.The research result is an important component of numerical tank and can be adopted for the numerical simulation of flow around submarine in future.
Towing
Propulsor
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Towing
Squat
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Submarine is a very important force in joint anti-submarine operation. But due to the lack of calculation model for the submarine chasing effect, the veracity of submarine operational research is seriously affected. Establishing a calculation model of the submarine chasing effect is important for simulating the operation against submarine. The paper establishes a searching effect model about submarine to submarine in two different ways (the distance we find the target is longer than the distance of target’s elusion, the distance we find the target is shorter than the distance of target’s elusion ) based on serious research of submarine’s search process and factors which effect search efficiency. It improves the search quality of submarine against submarine and gives the way to guarantee and improve search efficiency based on simulation and analysis of submarine’s search efficiency.
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In view of the significant effect of the submarine′s speed on its quiet operation,a feasible estimation method of the critical speed was proposed.The submarine′s speeds suitable for quiet attacks at different depths can be worked out with the presented method on condition that the submarine′s propeller and shell were determined.And the critical speed curves of two types of submarine changing with the depths were presented.The analysis shows that the critical speed is mainly related to the depth and that the allowed critical speed increases as the submarine dives deeper.Torpedoes can also be fired at the periscope depth or at a depth of less than 40 m,but at this time the submarine should sail at the speed of 8 kn to 12 kn.A submarine should cruise as deep as possible and launch torpedoes at such depth.In an actual combat,the method presented can be used to determine the advantaged depth and speed of a submarine,reduce the propeller noise and improve the submarine′s stealth.
QUIET
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The anti-submarine operation is an important style in the modern sea warfare. It has profound influence on the result of the sea warfares. This article introduces the anti-submarine platform and their influence. Finally, the writer proposes three tactic actions for the submarine operations of the PLA.
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