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A Cell - based Smoothed Finite Element Method for Free Vibration and Buckling Analysis of Shells
Chien Thai-Hoang,Nhon Nguyen-Thanh,Hung Nguyen-Xuan,Timon Rabczuk,Stephane Bordas 대한토목학회 2011 KSCE JOURNAL OF CIVIL ENGINEERING Vol.15 No.2
This paper further extends a cell-based smoothed finite element method for free vibration and buckling analysis of shells. A fournode quadrilateral Mindlin-Reissner shell element with a gradient smoothing operator is adopted. The membrane-bending and geometrical stiffness matrices are computed along the boundaries of the smoothing cells while the shear stiffness matrix is calculated by an independent interpolation in the natural coordinates as in the MITC4 (the Mixed Interpolation of Tensorial Components)element. Various numerical results are compared with existing exact and numerical solutions and they are in good agreement. The advantage of the present formulation is that it retains higher accurate than the MITC4 element even for heavily distorted meshes without increasing the computational cost.
Miniaturized Capacitively Loaded Step-Impedance Bandpass Filter in Multilayer Substrate
Thai Hoa, Duong,Dinh Chien, Hoang,Kim, Ihn Seok 慶熙大學校 레이저 工學硏究所 2007 레이저공학 Vol.18 No.-
In this paper, a miniaturized low insertion loss interdigital bandpass filter with capacitively loaded stepped impedance resonators (SIR) in Low Temperature Co-fired Ceramic (LTCC) technology is introduced. By using SIR and capacitive loading structures based on 6_(r) = 41.77 substrates, a wideband interdigital bandpass filter has been realized for the frequency range from 3.1 GHz to 4.8 GHz. Measurement shows insertion loss less than 0.8 dB, return loss better than 15 dB in the pass band with the center frequency at 3.95 GIIz and bandwidth ratio of 43 %. The filter has a size of 2.15 × 2.6 × 0.85㎣.