学术报告题目：Dynamics and vibration mitigation of a crane using global optimization
学术报告地点：科研楼208
学术报告时间：2023年3月23日 上午10：00
学术报告摘要：Vibration mitigation of a crane payload is a highly complex problem, nonlinear in its nature. Currently, thereare various active control strategies to mitigate swinging vibrations of the payload that require some knowledge on the payload state, but, to the authors’ best knowledge, there are no robust passive measures to mitigate such vibrations. In this presentation a concept of passive vibration absorber is proposed and studied. First the proposed strategy is developed for a stationary length of the payload cable, which helps to understand the effect of various parameters onto the dynamical behaviour of the payload and absorber. This is implemented by utilizing another pendulum acting as a nonlinear absorber, which adjustable mass and length can tune its characteristics to reduce the vibrations of the payload. The obtained results for the nonlinear stationary system have identified the optimal configuration of the absorber and the appropriate set of parameters, which allow reducing the payload’s amplitude of vibrations greatly. Then we will consider a non-stationary problem of nonlinear vibration mitigation of the payload to understand if the proposed earlier strategy is still effective in this case. The surrogate optimization technique is used to tune the absorber’s parameters within a given bounded set of parameters’ values. The optimization is conducted based on a priori known reeling speed or acceleration/deceleration of the primary pendulum, thereby completely removing the need for acquiring a current system states essential for active feedback control. The obtained numerical results validate the proposed strategy and demonstrate high performance of the nonlinear passive absorber when it is properly tuned.
专家介绍：Dr. Daniil Yurchenko is an expert in the area of Nonlinear Stochastic Dynamics and Control focusing on mathematical and experimental modelling of complex dynamic systems, systems with soft materials and green energy. He has obtained a BS degree in Applied Mechanics and Control from Saint-Petersburg Polytechnic Institute, MS and PhD degrees in Mechanical Engineering from Worcester Polytechnic Institute, USA. He has received a prestigious Russian Young Scientists award and he has led a number of industrial projects. He has given a. number of Keynote and Invited lectures, has written a monograph and published over 130 technical papers. He is a member of the EUROMECH and IFToMM, Editorial board member of Mechanical Systems and Signal Processing, Vibration, International Journal of Dynamics and Control. Currently he holds an NSF-EPSRC grant (2021-2024) on stochastic dynamics of strongly nonlinear systems with soft dielectric polymers, the Royal Society grant on collaboration with China. He is the Chair of the Euromech Colloquia on Mechanics of Soft Materials to be held in Southampton in 2022.