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The idea of quasi-Green’s function method is clarified by considering a free vibration problem of the simply-supported trapezoidal shallow spherical shell. A quasi-Green’s function is established by using the fundamental solution and boundary equation of the problem. This function satisfies the homogeneous boundary condition of the prob-lem. The mode shape differential equations of the free vibration problem of a simply-supported trapezoidal shallow spherical shell are reduced to two simultaneous Fredholm integral equations of the second kind by the Green formula. There are multiple choices for the normalized boundary equation. Based on a chosen normalized boundary equa-tion, a new normalized boundary equation can be established such that the irregularity of the kernel of integral equations is overcome. Finally, natural frequency is obtained by the condition that there exists a nontrivial solution to the numerically discrete algebraic equations derived from the integral equations. Numerical results show high accuracy of the quasi-Green’s function method. 相似文献
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关于Nevanlinna第二基本定理的推广 总被引:2,自引:0,他引:2
引言 在本文中,亚纯函数是指在|z|<+∞为亚纯的函数。 在R.Nevanloinna所建立的亚纯函数的理论中,第二基本定理的重要性是大家熟知的. 1940年Milloux作了两种推广,第一种是 相似文献
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