Analysis of deflection and dynamic plant characteristics of Cyperus malaccensis Lam |
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Authors: | Mana Shioya Arata Myoga Atsuya Kitagawa Yukihisa Tokunaga Hiroaki Hayashi Yasuo Kogo |
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Institution: | 1. Department of Applied Electronics, Tokyo University of Science , Tokyo, Japan;2. Hayashi Farm , Kunisaki City, Oita, Japan;3. Department of Materials Science and Technology, Tokyo University of Science , Tokyo, Japan |
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Abstract: | ABSTRACT In this study, flexural rigidity, natural frequency, and damping coefficient of Cyperus malaccensis Lam. with long stems were measured for application for fluid–structure interaction simulation in a field. Numerical solutions of deflection and natural frequency were calculated by ANSYS with finite element method (FEM). The triangular cross-section shape of C. malaccensis stem has a big neighbourhood of the root and the cross-section has taper structure to become small towards tip direction. Two numerical simulation models for FEM have Model A with a triangular prism shape and Model B with a truncated trigonal pyramidal shape to evaluate the effects of stem tapering. Because of large C. malaccensis stem deflection, an equation for nonlinear deflection was introduced to solve a problem regarding flexural rigidity. Natural frequencies of the stem were estimated using amplitude ratio during stem swinging by forced vibration, captured using a high-speed camera. The Model B corresponded with the measurement, and the results suggested that the stem characteristics were affected by cross-section shape. Damping coefficient was calculated using free vibration response, which was consistent with the analytical solution and numerical data calculated using measured characteristics. |
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Keywords: | Cyperus malaccensis Lam deflection frequency response finite element method forced vibration experiment |
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