报告题目1：Dynamic Characteristics of a Vibroimpact Nonlinear Energy Sink--- Modeling and Applications.

报告题目2：Dynamic Characteristics of a Vibroimpact Nonlinear Energy Sink--- Semi-Analytical Solution.

报告人： Daniil Iurchenko，University of Southampton

邀请人：黄冬梅

报告时间：2024年4月10日，14:30-15:30(第一场)；15:30-16:30(第二场)

报告地点：行政辅楼235会议室

报告人简介：Dr. Iurchenko is an expert in the area of Nonlinear Stochastic Dynamics and Control, Vibrations mitigation, mathematical and experimental modelling of complex dynamic system with application in railway and automotive engineering, as well as energy harvesting fields. He has published over 150 scientific publications including peer-reviewed journals and conference proceedings. He is an Editorial board member of Mechanical Systems and Signal Processing, Int. J. of Dynamics and Control, Vibrations.

报告摘要1：The presentation is focused on the modeling and applications of a vibroimpact (VI) pair that serves as VI Nonlinear Energy Sink (NES) for vibration mitigation. The VINES has emerged as a promising passive mechanism for vibration mitigation and consists of a ball travelling within a cavity of an externally excited linear oscillator (LO). The ball impacts either end of the cavity, transferring energy from the LO to the ball and mitigating excess oscillations of the LO. This presentation

mainly introduces the modeling and potential application field.

报告摘要2： In this presentation, we use our work with exact maps in VINES, which allow removing the previously imposed constraints and finding an exact semi-analytical solution, therefore considering a much wider set of system parameters. The analysis identifies multiple regions for the desired behaviour with two alternating impacts per forcing period and provides relevant stability conditions. Semi-analytical results indicate the influence of the mass ratio on the VINES performance and reveal whether effective vibration mitigation is achievable away from the main resonance.