ANSYS的螺旋桨-轴系-壳体振动特性分析+CAD图纸
毕业论文关键字 ：螺旋桨；振动；有限元分析；模态分析；谐响应分析
Abstract Shipping is a man-made vehicle which mainly runs in geographic waters,its structure is extremely complicated,it mainly consists of shell,shafting,propeller and other components.When shipping is sailing in the waters, the hull structure will be inevitably influenced by external incentives, which may result in varous degrees of vibration. Vibration of the shipping affects the development of the ship, at present, with the continuous development of China's shipbuilding industry, for low vibration of the ship have become increasingly demanding. This article will do research on ship’s shell - shafting - propeller system based on SUBOFF submarine.Through parameterization of the propeller - shafting - shell modeling, then with the utilize of finite element analysis software ,do research on propeller - shafting - shell system strength analysis, modal analysis and harmonic response analysis to determine the strength and vibration characteristics. The conducted investigations in this thesis are listed as followes. 1.The establishment of the prtopeller-shafting-shell system model.First,for the problem of propeller parametric modeling,with the knowledge of propeller,the parametric modeling of propeller will be introduced,introduce the process of propeller model in modeling software Solidworks.Then, describes the process of of establishing propeller shaft and the SUBOFF model briefly.Finaly,describe the coupling of propeller-shafting-shell system. 2.Based on the model which is established,the system will be finite element analyzed,using Block Lanczos method to analyze the static strength,the natural frequency and modal shapes of propeller shaft system, shell and coupled system within a specific range of frequencies. On the results of the modal analysis of the coupled system do harmonic analysis with Modal superposition method, do research on its displacement under harmonic excitation effect, analyze the resonance frequency of coupling system. 3.Based on coupling system, modify the shell, add annular ribs, compare the different impact on modal shapes and natural frequencies of the shell and coupled system. Then change the spring stiffness of the system and the density of material, analyze the influence of stiffness of the spring on coupling system modal shapes and natural frequencies. Finally, add the annular rib to the coupling system and do harmonic response analysis with Modal superposition method, do research on harmonic displacement and compared with the previous system, analyze the influence of annular rib to the coupled system. Finally, conclusions of this thesis are summarized.Contribution and further investigations are presented. KeyWords: propeller vibration; finite element analysis; modal analysis; harmonic response analysis