In this study, free in-plane and out-of-plane bending vibrations of frame structures have been analyzed together with torsional vibration. Axial extension, rotational inertia and shear effects have also been considered. The frame structure has been designed to have two beams with doubly symmetric cross sections that are connected at various angles to each other. Natural frequencies have been obtained analytically by solving simultaneous linear equations of complex coefficients. Finite element and experimental modal analysis have also been conducted to verify the analytical results. The agreement among the results from the various methods has been found to be good.
In this study, vibration analysis of a telescopic platform is conducted, and the platform structure is reconstructed to satisfy vibrational standards. The analysis is realised using solid modelling, finite elements and an analytical method. The results are verified using experimental modal techniques. Through the finite element and experimental modal approach free vibration analysis is carried out and natural frequencies are determined. Additionally, vibration accelerations of the structure are obtained by forced vibration analysis of the model. All calculations one performed on the new reconstructed structure, and it is determined whether the reconstructed structure satisfies the vibrational standards.
In this study, the dynamic behavior of trapezoidal and sinusoidal corrugated plates, which are widely used in the fields of space, aviation, automotive design, construction, and shipbuilding, was analyzed. A total of 330 different surface models of corrugated plates with varying corrugation heights, widths and numbers of corrugations were created, which have various manufacturing parameters. At this stage, the total number of natural frequency and mode shape analyses conducted for different boundary conditions is 660, where 330 are for four sides free and 330 are for four sides encastre. Mode shapes were also obtained using the finite element method. In addition, changes in the trapezoidal cross-sectional profile were investigated by analyzing 38 different plates with varying cross-sectional profiles. Examining these results, the effects of corrugation height and number on the natural frequencies and mode shapes of the plate were determined. As a result of the study, a total of 368 plate drawings were prepared, and 736 analyses for two types of boundary conditions were performed. Moreover, the theoretical results were verified using the experimental modal analysis technique for some selected models that are being manufactured in the market.
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