A Method for Online Monitoring Data Release of Composite Submarine Cable Based on Horizontal Federated Learning
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Conventional online composite submarine cable monitoring data release mostly adopts the method and principle of blockchain dynamic zoning consensus. In the data release process, there are omissions, and it takes a long time to complete the task, which reduces the timeliness of online composite submarine cable monitoring data release. Based on this, a new data publishing method is proposed by introducing horizontal federation learning. First, the online monitoring data of composite submarine cables are collected and preprocessed to eliminate the high-frequency capacitive effect of submarine cables. Secondly, manage composite submarine cable data nodes, transform the status relationship of data nodes, and ensure the quality of subsequent data release. A horizontal federation learning model is established to design the online monitoring data release process. The experimental results show that the new data release method is highly feasible. With the increasing online monitoring data of composite submarine cables, the time required for data release is short, and the timeliness is high.Abstract The hull is an important component of the submarine structure, and it is also one of the factors that affect the concealment of the submarine. By using the finite element method, a submarine model was established to analyze the hydrodynamic noise at the contact points between the front and rear of the hull and the hull under different diving angles. The results show that when the diving angle is about 10°, the hydrodynamic noise at the front and rear positions of the enclosure is relatively small. The research results provide a reference for ensuring the stealth operation conditions of submarines and have practical significance for improving the stealth of submarines.
Enclosure
Flanking maneuver
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Combined with ship practical antisubmarine equipment of towed linear array sonar,a mathematical model of ship localization for submarine based on bearing measurement is built,and localization algorithm was given to solve submarine movement parameters.Localizaiton errors were analyzed.On the basis of localization model and algorithm,simulation was done to study the effect of factors such as initial distance between submarine and ship,submarine initial bearing angle measured by ship,submarine course,submarine speed and measurement times of bearing angle in the leg time on localization performance,and simulation results were given and analyzed.The results have practical value to instruct real antisubmarine.
Course (navigation)
Basis (linear algebra)
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One of the aspects that need to be considered in designing a submarine is the effect of the hydrodynamic aspect on resistance and maneuverability in various operating conditions. In certain conditions, submarines operate in conditions near the seabed. In general, submarines are designed to operate in submerge and surface mode. However, under certain conditions, submarines need to operate near the surface of the seabed. Only a few papers or journals have discussed the hydrodynamic aspects of submarines in their operating mode near the seabed. Several methods such as numerical and physical modeling tests can be used to predict the hydrodynamic capabilities of a submarine. This paper discusses the effect of the hydrodynamic aspects that occur in submarines when operating near the sea bed using the numerical CFD method. This method has high flexibility compared to experimental methods and does not require a long time to get the results. In this simulation, a submarine model with a length of 2 m is used.
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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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Limited from detecting means,the threat estimation on air targets is a difficult problem to submarine underwater.In according with all the available messages,analyzing,ship-borne antis-ubmarine helicopter's factors affecting its own taking off,jumping hours and detecting hours of sonar are analyzed quantitatively.Dynamic model about calculating ship-borne helicopter fighting time underwater is established.It can provide the proper logical support to submarine evaluating the threat degree of targets from sky.
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Overtaking
Submarine canyon
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It is well known that a submarine has the excellent propulsive performance in high speed. navigation in deeply submerged condition, but few papers have sufficiently shown economical feasibility of submarines for commercial use.The authors have studied about the feasibility of submarine tankers with a view to develop technical problems of commercial submarines. At first, the experiments on five submarine tanker models with the circular and rectangular hull sections were performed by method of three-component measurements at Mejiro No. 2 Tank.Examining the resistance, stability, floating draft and general arrangement of the submarine tankers, the authors chose the ST-2 type rectangular hull form as best for the submrine tanker. The lines of the ST-2 type hull form was shown in Fig. 3The ST-2 type submarine tankers with various dead weights and shaft horse powers were designed and their investment, operation cost, annual profit, freight rate per dead weight and capital recovery factor were calculated. The results of this study were summarized in Fig. 19 to 23. The best submarine tanker in the point of view of commercial feasibility was 40, 000 tons in dead weight and 20, 000 horse powers in shaft horse power under restrained condition within 14 meters in maximum floating draft. On the contrary to the previous opinions, was shown the fact that the submarine tankers would not be very fast than present conventional tankers. As shown in Fig. 23, the submarine tanker would not have commercial feasibility without drastically decreased cost of nuclear power plants.
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Abstract Traditionally, submarine hydrodynamic design has focussed mainly on requirements regarding operational range, powering performance and manoeuvring ability for deeply submerged conditions. To improve the effectiveness of the boat, attention is also paid to operating near or at the surface and fortunately, computational tools and experimental methods are available to analyse the performance of submarines at these conditions. To advance submarine hydrodynamics knowledge and tools, DMO and MARIN have conducted a wide variety of bi-lateral or collaborative studies using potential and viscous flow methods and experiments on several submarine hull forms. In this article, several examples are presented of the development and use of hydrodynamic tools available during the design and assessment process of future submarines. These examples range from experimental and numerical studies into at-surface and periscope-depth resistance and powering, periscope-depth manoeuvring, high-fidelity flow around the boat during straight flight and manoeuvring motions, wakes of surface-piercing masts, to depth keeping under waves. It is demonstrated how state-of-the-art studies help in advancing the knowledge on submarine hydrodynamics and improving the overall design of modern submarines.
Naval architecture
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