日本語フィールド
著者：Erjon Krasniqi, Ryuki Nagano, Muhammad Nizam bin Zakaria
Hiroyuki Obiya題名：A Foundational Study on Rational Optimization of Damping Ratio for Accurate Dynamic Simulation with Ultra Large Displacement発表情報：Proceedings of IConCEES2023キーワード：概要：The integration of dynamic simulation analysis has become widespread in general-purpose softwares, providing enhanced capabilities. However, accurately tracking deformations based on complete equilibrium solutions remains a significant challenge in problems characterized by strong geometric nonlinearity. This study examines the accuracy of the combined Newmark β method and Tangent stiffness method in dynamic analysis with ultra large displacements and evaluates the utility of Rayleigh proportional damping in numerical simulations compared to experimental models. An experimental model of a slender steel plate undergoing free vibrations after being released from a deformed state was created. Video footage capturing the deformation histories was compared to computational simulations to verify accuracy. The study also examines the appropriate values of the damping ratio (ζ) and the Newmark β value in the simulations. The results indicate that a damping ratio of 3.0×10-5 and a β value of 1/2 yield more realistic simulations with longer conservation of mechanical energy. The findings suggest that incorporating numerical damping into actual damping settings can achieve a more realistic simulation of dynamic behavior with ultra-large displacements. Further improvements in time increment and stiffness evaluation can overcome the remaining challenges and enhance the accuracy of simulations.抄録：英語フィールド
Author：Erjon Krasniqi, Ryuki Nagano, Muhammad Nizam bin Zakaria
Hiroyuki ObiyaTitle：A Foundational Study on Rational Optimization of Damping Ratio for Accurate Dynamic Simulation with Ultra Large DisplacementAnnouncement information:Proceedings of IConCEES2023An abstract：The integration of dynamic simulation analysis has become widespread in general-purpose softwares, providing enhanced capabilities. However, accurately tracking deformations based on complete equilibrium solutions remains a significant challenge in problems characterized by strong geometric nonlinearity. This study examines the accuracy of the combined Newmark β method and Tangent stiffness method in dynamic analysis with ultra large displacements and evaluates the utility of Rayleigh proportional damping in numerical simulations compared to experimental models. An experimental model of a slender steel plate undergoing free vibrations after being released from a deformed state was created. Video footage capturing the deformation histories was compared to computational simulations to verify accuracy. The study also examines the appropriate values of the damping ratio (ζ) and the Newmark β value in the simulations. The results indicate that a damping ratio of 3.0×10-5 and a β value of 1/2 yield more realistic simulations with longer conservation of mechanical energy. The findings suggest that incorporating numerical damping into actual damping settings can achieve a more realistic simulation of dynamic behavior with ultra-large displacements. Further improvements in time increment and stiffness evaluation can overcome the remaining challenges and enhance the accuracy of simulations.