This paper presents a unified approach for predicting the free and forced(steady-state and transient)vibration analyses of annular sector and annular plates with various combinations of classical and non-classical bou...This paper presents a unified approach for predicting the free and forced(steady-state and transient)vibration analyses of annular sector and annular plates with various combinations of classical and non-classical boundary supports. In spite of the types of the boundary restraints and the shapes of the plates, the admissible displacement function is described as a modified trigonometric series expansion, and four sine terms are introduced to overcome all the relevant discontinuities or jumps of elastic boundary conditions. Mathematically, the unification of various boundary value problems for annular sector and annular plates is physically realized by setting a set of coupling springs to ensure appropriate continuity conditions along the radial edges of concern. Numerous examples are presented for the free vibration analyses of annular sector and annular plates with different boundary restraints.With regard to the forced vibration analysis, annular sector and annular plates with different external excitations are examined. The accuracy, convergence and numerical robustness of the current approach are extensively demonstrated and verified through numerical examples which involve plates with various shapes and boundary conditions.展开更多
基于改进傅里叶级数方法(Improved Fourier Series Method,IFSM)对任意边界条件下环扇形板的面内自由振动特性进行计算分析,任意边界条件可采用沿各边界均匀分布的法向和切向线性弹簧来模拟。环扇形板的径向和切向位移函数被不变地表示...基于改进傅里叶级数方法(Improved Fourier Series Method,IFSM)对任意边界条件下环扇形板的面内自由振动特性进行计算分析,任意边界条件可采用沿各边界均匀分布的法向和切向线性弹簧来模拟。环扇形板的径向和切向位移函数被不变地表示为改进傅里叶级数形式,并通过引入正弦函数项来克服弹性边界的不连续或跳跃现象。将位移函数的傅里叶展开系数看作广义坐标,并采用瑞利-里兹方法对其进行求解,得到一个关于未知傅里叶系数的标准特征值问题。通过求解标准特征值问题而简单地求解环扇形板面内振动的固有频率及其振型。通过不同边界条件下环扇形板模型结果与文献解及有限元法结果相对比来验证了本文方法的正确性及可靠性。展开更多
基于三维弹性理论,采用改进傅里叶级数法(Improved Fourier Series Method,IFSM)对环扇形板三维自由振动进行了数值分析。环扇形板的位移函数表示为一种改进的三角级数形式,而边界条件则通过均匀分布在各边界面的线性弹簧来模拟,通过改...基于三维弹性理论,采用改进傅里叶级数法(Improved Fourier Series Method,IFSM)对环扇形板三维自由振动进行了数值分析。环扇形板的位移函数表示为一种改进的三角级数形式,而边界条件则通过均匀分布在各边界面的线性弹簧来模拟,通过改变边界约束弹簧的刚度值来实现不同的边界条件。将位移函数的未知级数展开系数看作广义坐标,并采用瑞利-里兹法进行求解,得到一个关于未知系数的标准特征值问题。环扇形板结构的三维自由振动特性可以通过求解标准特征值问题简单获得。数值计算结果充分表明,文中采用改进傅里叶级数法分析环扇形板三维自由振动问题的有效性和正确性。展开更多
采用改进傅里叶级数方法(Improved Fourier Series Method,IFSM)对环扇形薄板的静动态特性进行计算分析。位移函数被表示为一个包含正弦与余弦的二维改进傅里叶级数,通过引入正弦项有效地解决了边界上可能存在的不连续或跳跃现象;基于...采用改进傅里叶级数方法(Improved Fourier Series Method,IFSM)对环扇形薄板的静动态特性进行计算分析。位移函数被表示为一个包含正弦与余弦的二维改进傅里叶级数,通过引入正弦项有效地解决了边界上可能存在的不连续或跳跃现象;基于能量原理建立了环扇形薄板的计算模型,利用IFSM方法推导了环扇形板结构的质量矩阵和刚度矩阵,通过求解标准特征值问题得到未知傅里叶展开系数,从而求得环扇形板结构的静动态特性。通过数值分析计算验证了方法的正确性和可靠性。展开更多
基金the National Natural Science Foundation of China(No.51505445)the Key Subject“Computational Solid Mechanics”of the China Academy of Engineering Physics
文摘This paper presents a unified approach for predicting the free and forced(steady-state and transient)vibration analyses of annular sector and annular plates with various combinations of classical and non-classical boundary supports. In spite of the types of the boundary restraints and the shapes of the plates, the admissible displacement function is described as a modified trigonometric series expansion, and four sine terms are introduced to overcome all the relevant discontinuities or jumps of elastic boundary conditions. Mathematically, the unification of various boundary value problems for annular sector and annular plates is physically realized by setting a set of coupling springs to ensure appropriate continuity conditions along the radial edges of concern. Numerous examples are presented for the free vibration analyses of annular sector and annular plates with different boundary restraints.With regard to the forced vibration analysis, annular sector and annular plates with different external excitations are examined. The accuracy, convergence and numerical robustness of the current approach are extensively demonstrated and verified through numerical examples which involve plates with various shapes and boundary conditions.
文摘基于改进傅里叶级数方法(Improved Fourier Series Method,IFSM)对任意边界条件下环扇形板的面内自由振动特性进行计算分析,任意边界条件可采用沿各边界均匀分布的法向和切向线性弹簧来模拟。环扇形板的径向和切向位移函数被不变地表示为改进傅里叶级数形式,并通过引入正弦函数项来克服弹性边界的不连续或跳跃现象。将位移函数的傅里叶展开系数看作广义坐标,并采用瑞利-里兹方法对其进行求解,得到一个关于未知傅里叶系数的标准特征值问题。通过求解标准特征值问题而简单地求解环扇形板面内振动的固有频率及其振型。通过不同边界条件下环扇形板模型结果与文献解及有限元法结果相对比来验证了本文方法的正确性及可靠性。
文摘基于三维弹性理论,采用改进傅里叶级数法(Improved Fourier Series Method,IFSM)对环扇形板三维自由振动进行了数值分析。环扇形板的位移函数表示为一种改进的三角级数形式,而边界条件则通过均匀分布在各边界面的线性弹簧来模拟,通过改变边界约束弹簧的刚度值来实现不同的边界条件。将位移函数的未知级数展开系数看作广义坐标,并采用瑞利-里兹法进行求解,得到一个关于未知系数的标准特征值问题。环扇形板结构的三维自由振动特性可以通过求解标准特征值问题简单获得。数值计算结果充分表明,文中采用改进傅里叶级数法分析环扇形板三维自由振动问题的有效性和正确性。
文摘采用改进傅里叶级数方法(Improved Fourier Series Method,IFSM)对环扇形薄板的静动态特性进行计算分析。位移函数被表示为一个包含正弦与余弦的二维改进傅里叶级数,通过引入正弦项有效地解决了边界上可能存在的不连续或跳跃现象;基于能量原理建立了环扇形薄板的计算模型,利用IFSM方法推导了环扇形板结构的质量矩阵和刚度矩阵,通过求解标准特征值问题得到未知傅里叶展开系数,从而求得环扇形板结构的静动态特性。通过数值分析计算验证了方法的正确性和可靠性。