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Anti-torpedo torpedoes (ATT), as a kind of new defense underwater weapon, are widely applied on the active defense systems. In order to effectively combat the target, ATT needs better manipulation and faster navigation strategy. In the present paper, the guided trajectory of ATT is studied in detail by motion simulation. In order to study the guided trajectory characteristics of ATT, the kinematics...
High-altitude gliding unmanned underwater vehicles (HAGUUVs) are released in high attitude and works in water after a short glide in the air. According to the High-altitude Gliding UUV airborne emission requirements, the folding mechanism of wings of the HAGUUV is desighed. On the basis of mechanics analysis of the organization, the dynamics modeling of organization's unfolding process is given by...
To improve research efficiency of engineering problems, Surrogate model has gained its popularity in replacing real engineering model. This paper proposes a kind of Global Sequential Sampling Algorithm (GSSA) based on surrogate model. With the process of iteration, GSSA can sample both in unexplored region and large-error region, then iteratively update the samples. OLHS is used as initial sampling...
In order to improve the performance of underwater gliders, the shape of a new underwater glider was designed with the Blended-Wing-Body (BWB). In this paper, the relationships between steady-state gliding motion parameters and energy consumption for the Blended-Wing-Body underwater glider (BWBUG) have been researched. Firstly, the steady gliding motion modeling of the BWBUG was built to describe the...
A novel anchor system which can convert fluid energy into power is designed conceptually in this paper. It combines vortex induced vibration (VIV) and piezoelectric cantilever beam. The transversed motion model of the bluff body established with Sarplaya's lift decomposition model and the bending model of cantilever beam is established with Euler-Bernoulli assumption. With the two separate model the...
According to the AUVs' mission requirement of large operational depth, this paper provides a kind of ring-stiffened multiple intersecting spherical shell (RSMISS) for AUVs. In order to get the performance of the new shell, a surrogate-based optimization (SBO) method is proposed. The SBO method is employed to explore the kriging-based model. Simultaneously, a multi-start optimization approach is repeat-ed...
On the basis of the analysis of the flux leakage mechanism of permanent magnet DC motors, boundary conditions for numerical simulation of a leakage magnetic flux are estabLished. By using the finite element analysis software Magnet, the motor leakage magnetic flux is simulated under different boundary conditions. The results of numerical simulation agree with the results of the test in the motor,...
Under the entropy loss function, the minimum risk equivariant estimation and E-Bayes estimation are obtained using conjugate prior. We also prove minimum risk equivariant estimation is also the minimax estimation. The MSE of the estimations are further compared based on Monte Carlo simulation. According to these comparisons, it is suggested that the accuracy of E-Bayes estimation is the highest
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