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Yin Z.-Y.,China Ship Scientific Research Center | Chen K.,Institute of Naval Academy of Armament | Yang S.-L.,Chinese Peoples Liberation Army
Chuan Bo Li Xue/Journal of Ship Mechanics | Year: 2015

This paper presents a new cantilever damper design, which aims at reducing the amplitude of low frequency line spectrum and 3D vibration transmission. Based on the wave theory in beam and structural impedance analysis method, the insertion loss calculation formulation is deduced. The relationship among insertion loss and damper mass, reed size is obtained by parameter analysis. The measured data demonstrate that the presented design method and damper structure fulfill the design objective. ©, 2015, China Ship Scientific Research Center. All right reserved.


Ma C.,Institute of Naval Academy of Armament | Cai H.,Institute of Naval Academy of Armament | Qian Z.,Institute of Naval Academy of Armament | Qian Z.,Wuhan Naval University of Engineering | And 2 more authors.
Ship Building of China | Year: 2014

In this article, PBCF and propeller are considered as a whole unit and an integrative design procedure is carried out, in which uploading at blade root is emphasized. Uploading in blade root will generate hub vortex, which can be restrained by PBCF because of its energy saving mechanism. An integrative propeller-PBCF design method is provided. Potential flow theory, CFD tools, artificial intelligence optimization algorithm, and model tests are applied in completion of this design method. Model test data indicate higher efficiency of the propeller-PBCF unit by this design method, and utility, robustness and practicality of the design method is shown. ©, 2014, The Editorial Board of Ship Building of China. All right reserved.


Cai H.-P.,Institute of Naval Academy of Armament | Ma C.,Institute of Naval Academy of Armament | Qian Z.-F.,Institute of Naval Academy of Armament | Qian Z.-F.,Wuhan Naval University of Engineering | And 2 more authors.
Chuan Bo Li Xue/Journal of Ship Mechanics | Year: 2013

The determination of the optimum radial circulation distribution of the propeller is investigated based on the improved lifting-line model and the improved particle swarm optimization algorithm. The axial, radial and tangential induced velocities are considered, and the kinematics boundary condition that the direction of vortex line is consistent with the local flow field direction is fulfilled by iteration calculation. Therefore, the improved lifting-line model could be applied on many conditions including the heavy loaded condition to determine the circulation distribution. Meanwhile, an improved particle swarm optimization algorithm is proposed. A mutation strategy for premature convergence particles is added in the algorithm. And the traditional variational calculus method is replaced by this optimization method to calculate the propeller radial circulation distribution. Several circulation distribution optimizations and the analysis of calculations are carried out. Optimization results demonstrate the effectiveness and robustness of the method.


Cai H.-P.,Institute of Naval Academy of Armament | Ma C.,Institute of Naval Academy of Armament | Chen K.,Institute of Naval Academy of Armament | Qian Z.-F.,Institute of Naval Academy of Armament | And 2 more authors.
Chuan Bo Li Xue/Journal of Ship Mechanics | Year: 2014

Better skew distribution is benefit for propeller blade sections to access the nonuniform ship wake nonsynchronously, so the vibration and noise induced by propeller operating in the ship wake can be decreased. In this paper, an artificial intelligence optimization algorithm and a prediction method of unsteady hydrodynamic characteristics of propeller based on the surface panel method are provided to optimize the propeller skew distribution. The propeller skew distribution curve is described by B-spline, and the curve fairing is ensured; Aiming at reducing unsteady axial forces, an improved particle swarm optimization combined with the prediction method of propeller unsteady hydrodynamic performance is utilized to optimize and analyze propeller skew distribution. The parallel optimization algorithm based on OpenMP is also developed for multi-cup computers in order to improve the computation efficiency. Numerical optimization results show that the propeller skew optimization method provided in this paper can reduce propeller unsteady thrust amplitude, the method is effective, reliable and practical, and the parallel computing can improve the optimizing efficiency greatly.


Ma C.,Institute of Naval Academy of Armament | Qian Z.-F.,Institute of Naval Academy of Armament | Qian Z.-F.,Wuhan Naval University of Engineering | Chen K.,Institute of Naval Academy of Armament | Cai H.-P.,Institute of Naval Academy of Armament
Chuan Bo Li Xue/Journal of Ship Mechanics | Year: 2014

A new-type marine propeller called Multi-Blade Coupling Propeller (MBCP) is provided, and the hydrodynamic performance of it is studied. The MBCP adopts a brand-new form of axial misplacement for inner radius blades and even placement in the same blade-plane for outer radius blades. Thus the multi-layer coupling distribution of propeller blade is achieved. Favorable hydrodynamic interference between different blades is created, and the influence of hydrofoil cascade effect is reduced. Then the blade number can be increased or the area ratio can be enlarged while the propeller efficiency maintains in the same level. Therefore, the performance of cavitaion, noise and unsteady force can be improved. The MBCP may provide a new research direction for the low-noise propeller design work. The CFD numerical simulation and model test of the MBCP are carried out to study the open water and cavitation performance of the MBCP. Theoretical and experimental research shows that cavitation performance and efficiency of the MBCP can be improved about 20% and 7% respectively, compared with a now-utilized five-blade marine propeller. The error of CFD numerical simulation is less than 3%. The new-type low-noise multi-blade coupling propeller presented in this paper may be of great military significance.

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