演讲人Speaker：Dr. Zili Zhang

题  目Title：Dynamics and Control of Offshore Renewable Energy Structures  

时  间Time：2019 年04月30日X13:30-14:30 PM

地  点Venue：哈工大(深圳)  A509

讲座内容Seminar Content : 

As two important offshore renewable energy sources, wind energy and wave energy have received significant attention in energy and policy agendas. An important goal in research and development of renewable energy technologies is to reduce the cost per unit of delivered electrical energy, leading to the tendencies towards larger wind and wave energy installations. However, it also results in significant structural dynamic challenges in these renewable energy structures. As the size increases without a proportional increase of the stiffness, the wind turbines become more and more flexible and exhibit high susceptibility to wind or wave-induced vibrations. In order to reduce such vibrations it may become necessary to add passively or actively controlled damping elements to the system in order to remove mechanical energy from the primary structure. For wave energy converters (WEC) the objective is oppositely to control the motion of the system in such a way that a maximum mechanical energy is supplied to the absorber. In both cases, the modeling and control of dynamic systems including fluid-structure interaction turns out to be the most essential problem, which is the main focus of the present presentation.

Effective and robust vibration control methods have been proposed for mitigating blade and tower vibrations of wind turbines, as well as motions of the floating foundation. Technical solutions for wave energy point absorbers have also been explored, in order to maximize the mean absorbed power and to deliver more smooth power to the grid.

简历Brief Bio：

Zili Zhang, PhD, is Assistant Professor of Structural Dynamics and Control at the Department of Engineering, Aarhus University (Denmark). His research aims to create new knowledge and technologies for more sustainable, adaptive and hazard-resilient civil engineering structures. The research focus is to quantify the stochastic dynamic load effects caused by natural hazards (e.g. strong winds and sea waves) on civil structures, and to develop innovative strategies to mitigate and control their effects.

He is Member of Danish Center for Applied Mathematics and Mechanics (DCAMM). He has published 1 book, 21 journal articles, and 11 conference papers. He is the recipient of AUFF starting grant and EUopstart grant.