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He T.,CAS Beijing Institute of Acoustics | He T.,Jiangsu Key Laboratory of Green Ship Technology | Sun G.,China Ship Scientific Research Center | Sun Y.-D.,CAS Beijing Institute of Acoustics | And 3 more authors.
Chuan Bo Li Xue/Journal of Ship Mechanics | Year: 2014

Plate-silencer possesses low frequency and broadband noise attenuation characteristics, which is potentially better than conventional holmholtz resonators and porous sound absorbing materials. In this paper, material and geometric coefficients of plate and cavity are analyzed. The study shows that the less cavity restraining on plate is, the more effective silencers is and the lower plate first resonate frequency is, the lower noise attenuation frequency is. Therefore, low spring-mass-ratio plate with large area is preferred; more compact geometric silencer can be realized with air cavity other than water cavity for retaining low frequency and broadband noise attenuation characteristics. Influence of pressured air cavity on TL is analyzed and the results indicate that plate silencers retain low frequency broadband noise attenuation characteristics under higher pressure conditions, and the noise attenuation broadband expanded and shift to low frequency. Source


Liu Y.,Jiangsu Key Laboratory of Green Ship Technology | Liu Y.,China Ship Scientific Research Center | Chen L.,Shanghai JiaoTong University
Journal of Vibroengineering | Year: 2016

The effect of weld residual stress on the free vibrational characteristics of cylindrical shell is investigated. Motion equations of cylindrical shell with weld residual stress are established based on Flügge theory, the interaction between weld residual stress and displacements is investigated. The analytical method is applied to calculate the vibrational mode. Weld residual stress can induce the variation of free vibrational characteristics. The amplitude mainly effects the variation magnitude of natural frequency and mode shape, and the distribution dose on the variation trend. © JVE INTERNATIONAL LTD. Source


Liu D.,China Ship Scientific Research Center | Liu D.,Jiangsu Key Laboratory of Green Ship Technology
Procedia Engineering | Year: 2015

According to the mass transport equations of vapor and liquid, and Rayleigh-Plesset equation, a cavitation model based on a single-fluid multi-phase flow method is proposed, which especially considers the nonlinear variety of the bubble radius and is expected to deal well with cloud cavitating flow.The proposed cavitaion model was validated against a benchmark database for 2D NACA66MOD hydrofoil and experimental photos of E779A propeller sheet cavitation shape. The overall results suggest that the present proposed cavitation model is practicable for simulating cavitating flows. © 2015 Published by Elsevier Ltd. Source


Zhao N.,China Ship Scientific Research Center | Zhao N.,Jiangsu Key Laboratory of Green Ship Technology | Liu J.-J.,China Ship Scientific Research Center | Liu J.-J.,Jiangsu Key Laboratory of Green Ship Technology | And 2 more authors.
Chuan Bo Li Xue/Journal of Ship Mechanics | Year: 2015

Based on broadside collision mode, the angle of two ships while collision happening and impacted position of store ship in each stage is analyzed, and the damage behavior of a store ship broadside in collision is studied through numerical simulation by explicit non-linear finite element method. The time history of collision force, energy absorption and structural deformation during collision are described. The damage mode and the resistant effects of the side structure and movement of the both encountered ships are analyzed and discussed. Some general instructive conclusions on behavior of store ship broadside collision are obtained. The research work of this paper provides a guide for evaluation of side structural damage of store ship and optimization design of side structure. ©, 2015, China Ship Scientific Research Center. All right reserved. Source


Hu Q.,China Ship Scientific Research Center | Hu Q.,Jiangsu Key Laboratory of Green Ship Technology | Zong T.,China Ship Scientific Research Center | Xu J.,China Ship Scientific Research Center | And 2 more authors.
Ship Building of China | Year: 2016

Speed trial standard ISO15016:2015 is applied to ships for which the speed trials were conducted on or after 1st September, 2015. In this paper, main differences between ISO15016:2015 and ISO15016:2002 were presented, and comparison analysis of speed correction for two ships based on ISO15016:2015 and ISO15016:2002 respectively was carried out. On this basis, some problems in ISO15016:2015 were pointed out, and impact of the standard on shipbuilding industry was summarized. © 2016, Editorial Office of Ship Building of China. All right reserved. Source

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