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自由振动
    Free vibration of longitudinal stiffened cylindrical shell under water
    水中纵向加肋圆柱壳体的自由振动
    Analysis and Research on the Hydroelastic Free Vibration of Stiffened Rectangular Plate
    矩形加筋板水弹性自由振动分析和研究
    Study on Hydroelasticity of Free Vibration for Thin walled Beams of Ship's Hull
    薄壁梁型船舶结构的水弹性自由振动
    Buckling and Free Vibration Study on Orthotropic Circular Cylindrical Shell Under Axial Load
    轴向压力作用下正交各向异性圆柱壳的稳定性与自由振动特性分析
    Brief reviews about elastic stability, free vibration, transient dynamic response and harmonic dynamic response of circular cylindrical shells are given first.
    本文首先对圆柱壳的稳定性、自由振动、瞬态和稳态动力响应研究进行了简要回顾和评述。
    For shear diaphragms at both ends, the resulting characteristic equations about pressure and frequency are given. The effect of shell’s parameters (L/R, h/R) and material properties on the free vibration characteristics have been studied in detail.
    分析了正交各向异性圆柱壳的自由振动特性以及静水压力对其自由振动频率的影响,详细讨论了壳体几何参数和材料特性参数对自振频率的影响,给出了最低频率随L/R变化的包络线。
    A study for an orthotropic circular cylindrical shell subjected to axial load is present. The effect of shell’s parameters (L/R, h/R) and material properties on the free vibration characteristics have been studied. Following Flügge’s exact derivation for the buckling of cylindrical shells, the equations of motion for dynamic loading of an orthotropic circular cylindrical shell under external hydrostatic pressure have been formulated.
    本文基于Flügge壳体理论,从正交各向异性圆柱壳在轴向压力作用下的自由振动平衡方程出发,推导出在简支边界条件下壳体自由振动的特征方程,分析了正交各向异性圆柱壳在轴向压力作用下的稳定和自由振动特性以及轴向压力对其自由振动频率的影响,详细讨论了壳体几何参数和材料特性参数对于自振频率的影响,给出了最低频率随L/R变化的包络线。
    This paper make use of ANSYS to set up the model and considering the weight of attached water, make use of the moving matrix method to calculate the beginning 5 natural frequency of the ship hull free vibration and considering the shear force and the section move.
    本文利用ANSYS建模,并在考虑附连水质量的情况下,利用迁移矩阵法计算了计及剪切及剖面转动之船体梁的自由振动前5阶固有频率及振型。
    This thesis is mainly concerned with the hydroelastic free vibration of stiffened rectangular plate which contacts with water by one side or both sides.
    本文主要研究了加筋板结构在单面或双面与水接触时流固耦合自由振动特性。
    By using finite element technique(FET), the free vibration frequency of ship hull and superstructure,as well as the local free vibratiton frequency of decks are predicted.
    利用有限元技术对船体总振动、上层建筑整体和各层甲板局部自由振动频率及上层建筑振动响应进行了预报。
    The influences of ai r injection on free vibration, on respon se of forced vibration and on damping of the hull model are investigated under s everal selected combinations of 2 draft, 2 pore size, 5 air flow rates, 2 flow f luid velocities.
    通过 2种吃水、2种喷气孔径、5种喷气流量、2种水流速度的选择组合 ,研究了气幕对船模自由振动、强迫振动和振动阻尼的影响。
    Through tests, vibration mode accuracy of non damping free vibration calculation is analyzed. For the ships that their shafting response calculated with the vibration mode is beyond the requirements of the Rules, damping parameters are adjusted based on the measured amplitude, and an analytic calculation method is used to evaluate shafting torsion vibration characteristics.
    通过实测 ,对无阻尼自由振动计算的振型精度亦进行了分析 ,按振型推算系统响应超规范要求的船舶 ,可根据实测振幅来调整阻尼参数并用解析计算法来评价轴系扭振特性。
    An analysis is presented for the free vibration of orthotropic circular cylindrical shell subjected to hydrostatic pressure.
    本文对静水压力作用下正交各向异性圆柱壳的自由振动特性进行了分析。
    The influences of bubbly layer on free vibration,on response of forced vibration and on damping of the hull model are investigated in several variable combinations selected from 2 drafts,2 pore sizes,6 air flow rates and 2 flow water velocities.
    通过2种吃水、2种喷气孔径、6种喷气流量、2种水流速度的选择组合 ,研究气幕对船模自由振动、强迫振动和振动阻尼的影响。
    Aimed at the coupling effect between medium and struc tu re, the free vibration of an immerged thin longitudinal stiffened elastic shell was investigated.
    以浸没于水中的弹性加肋薄圆柱壳为研究对象 ,考虑介质与结构振动的耦合效应 ,研究耦合系统的自由振动特性 .
    The aim of the present research is to investigate the free vibration features of the ring-stiffened cylindrical shell filled with fluid or empty. Based on the Love shell theory, the authors derive the differential equation of vibration for the empty shell and the fluid-filled one in the simple support condition, and get their natural frequencies by solving the eigenvalue equations.
    分析中空和充液加肋圆柱壳的自由振动特性 ,基于Love壳体理论 ,列出了中空圆柱壳和考虑充液耦合下的振动微分方程 ,对于两端简支的边界条件 ,推导出关于中空和充液圆柱壳的频率的特征方程。
    A study for an orthotropic circular cylindrical shell subjected to axially loaded is present in this paper. For shear diaphragms at both ends, the resulting characteristic equations about pressure and frequency are given. The effect of shell's parameters (L/R, h/R) and material properties on the free vibration characteristics have been studied.
    依据Fl櫣gge壳体理论 ,分析了正交各向异性圆柱壳在轴向压力作用下的稳定和自由振动特性 ,详细讨论了壳体几何参数和材料特性参数以及轴向压力对于自振频率的影响 ,给出了最低频率随L/R变化的包络线。
    The whole process was devided into shock action phase and free vibration phase.
    该方法将冲击振动分成2个阶段:冲击作用阶段和自由振动阶段。
    In the free vibration phase,the response was calculated by adopting single DOF system which replaced initial conditions with the displacements and velocities of the final moment in the shock action phase.
    自由振动阶段,采用单自由度模型进行响应计算,设备在该阶段以冲击终了时刻的速度和位移为初始条件进行振动。
    Buckling and free vibration study on an orthotropic circular cylindrical shell subjected to axial load is presented in this paper. For simply supported boundary conditions at both ends, the resulting eigen equations about pressure and frequency are given. The effects of shell's parameters (L/R, h/R) and material properties on the free vibration characteristics have been studied.
    本文依据Flugge壳体理论,从正交各向异性圆柱壳在轴向压力作用下的自由振动平衡方程出发,推导出在简支边界条件下壳体自由振动的特征方程,分析了正交各向异性圆柱壳在轴向压力作用下的稳定性和自由振动特性,详细讨论了壳体几何参数和材料特性参数以及轴向压力对于自振频率的影响,给出了最低频率随L/R变化的包络线。
 

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