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您的检索式：作者名="Kwangil An"
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| 1 | A unified solution method for free vibration analysis of functionally graded rotating type plates with elastic boundary condition显示文摘In this paper,a unified solution method for analyzing the free vibration characteristics of functionally graded rotating type plate(FGRTP)of which the distribution of material is defined by four parameters is presented.It is assumed that the considered functionally graded materials(FGM)are distributed in the thickness direction according to four parameters.The displacement fields of any point on the FGRTP are determined by the first order shear deformation theory(FSDT),and all displacement functions are extended by ultraspherical polynomial.By applying the Ritz method to the energy function of the whole system,the constitutive equation of FGRTP is obtained and the natural frequencies are obtained by solving the eigenvalue problem.The boundary conditions are generalized to arbitrary boundary conditions by artificial elastic technique.The accuracy of the proposed method is verified by comparing with the previous literatures.The effects of different parameters on the free vibration characteristics of FGRTP are studied through some numerical examples. | Poknam Han Gangchol Li Kwanghun Kim Kwangil An Hoyong Yun | 2021 | Journal of Ocean Engineering and Science2021，6，2： | 0 |
| 2 | A solution method for free vibration analysis of coupled laminated composite elliptical-cylindrical-elliptical shell with elastic boundary conditions显示文摘In this paper,an efficient,convenient and explicit method based on the Haar wavelet discretization ap-proach for analyzing the free vibration of the coupled laminated composite elliptical-cylindrical-elliptical shells(ECESs)with elastic boundary conditions is presented.Two elliptical double curved shells are cou-pled on both end of cylindrical shell.Based on the first-order shear deformation theory the equations of motion for ECES are derived by means of Hamilton’s principle.The separation of variables is first per-formed;i.e.displacement components and rotations of any point of the ECES are expanded to the Haar wavelet series in the meridian direction and Fourier series in circumferential direction.The constants appearing from the integrating process are determined by boundary conditions,and thus the partial dif-ferential equations are transformed into algebraic equations.By solving the characteristic equation,the natural frequencies and mode shapes of coupled laminated composite ECES are obtained.The present re-sults have been compared with those of the published literature.The comparison results show that this method has high accuracy,high reliability and also a higher convergence rate in attaining the frequencies of the coupled laminated composite ECESs.Then,the effects of the main parameters such as material properties,geometrical parameters,and various boundary conditions,on the vibrational behavior of the coupled ECESs,are investigated.Finally,new free vibration analysis results of the coupled laminated com-posited ECES,which can be used as benchmark data for researchers in this field,are reported through the parameter study. | Kwanghun Kim Yongsu Jon Kwangil An Songhun Kwak Yongsu Han | 2022 | Journal of Ocean Engineering and Science2022，7，2： | 0 |
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