在国际项目管理中心资助下，应航天学院卫星技术研究所王峰教授的邀请，瑞尔森大学航空航天工程系（Department of Aerospace Engineering, Ryerson University）教授Krishna D. Kumar即将于2019年7月26日-2019年7月29日访问我校。访问期间将在我校开展学术报告。欢迎感兴趣的老师和同学参加。
讲座题目：Spacecraft Dynamics and Control: Evolution and Current Challenges
讲座内容：This lecture will review the evolution of dynamics and control of spacecraft since the space era began with the launch of Sputnik in 1957. Early satellites typically weighted in the range of 100 kg had simple functionalities resulting in simple on-board control systems. In the 80's and 90's, the trend moved towards larger and more complex spacecraft weighing 1,000 kg to 10,000 kg with advanced on-board control systems. In the last two decades, with advances in miniaturization, small satellites such as nanosatellites, picosatellites and femtosatellites have been designed andsome of them using simple to advanced control systems have been launched as well. In addition, spacecraft formation flying has been considered as an enabling technology for future space missions. Several propellant-free or passive methods and active methods for spacecraft control and maneuvering have been proposed in the literature; in the case of spacecraft orbital maneuvering, these methods are mainly based on thrusters, aerodynamic forces, solar radiation pressure, magnetic forces, and tethers. On the other hand, the methods for spacecraft attitude control and maneuver include reaction wheels/control moment gyros, thrusters, fluid rings, solar radiation pressure, aerodynamic forces, magnetic torquers, tethers, manipulators, MEMS devices, and movable masses.The controllers for spacecraft orbit and attitude maneuvering have been designed using linear control techniques as well as nonlinear control techniques such as linear quadratic regulator, Lyapunov-based control, feedback linearization control, sliding mode control or variable structure control, adaptive control, intelligent control (includes neural networks, fuzzy logic, and genetic programming), and combination of these. In addition to the fully actuated spacecraft, partial or intermittent failures of actuators as well as complete failures of some actuators i.e., the underactuated systems have also been examined. The feasibility of all these methods/techniques is established, in general, using stability analysis based on Lyapunov theory, numerical simulations, hardware-in-loop (HIL) simulations, and flight demonstrations. The evolution of all these methods, their current status and challenges associated with them with a focus on my research work will be briefly presented along with future direction of research on spacecraft dynamics and control.
讲座题目：Spacecraft Autonomy: Current Research and Future Challenges
讲座内容：A spacecraft or a swarm of spacecraft represents a highly complex engineering system; it comprises of several subsystems such as avionics subsystem, propulsion subsystem, thermal control subsystem, power subsystem, and payload subsystem. These systems are multi-input & multi-output (MIMO) systems generally ranging in hundreds of inputs and outputs. In recent years, the complexity of these subsystems has increased more than a hundred folds due to high performance requirement and increased autonomous capability.The Diagnosis, Prognosis and Health Monitoring (DPHM), fault tolerant control, artificial intelligence, and predictive analytics can play a significant role in meeting these requirements. Fault Tolerant Control (FTC) has been proposed for developing high performance autonomous flight vehicle.The FTC includes fault detection and isolation (FDI), robust control, and reconfigurable control (RC). My talk will discuss these methods and future challenges to achieve spacecraft autonomy.
Dr. Krishna D. Kumar is presently a Professor of Aerospace Engineering and Director of Artificial Intelligence and Predictive Analytics for Aerospace Systems (AIPAAS) Laboratory at Ryerson University, Toronto. His experience in research spans more than 27 years at various premier institutions in Canada and abroad (including Ryerson University, Canada; National Aerospace Laboratory, Japan; Kyushu University, Japan; Korea Advanced Institute of Science and Technology, South Korea; Defence Research and Development Organization, India; and Birla Institute of Science and Technology, Pilani, India). During these years, Prof. Kumar has made a significant mark in research with exemplary contributions leading to new theoretical results and novel technologies for satellite control, formation flying, and fault tolerant control. His research has resulted in over 200 publications in high-ranking journals (88 papers) and conference proceedings (116), 5 books, 14 intellectual properties, and four patents. He has delivered more than 100 invited lectures/talks at various premier institutions in Canada and abroad.
Prof. Kumar’s research achievements have been widely recognized nationally and internationally with several awards that include Member of International Academy of Astronautics, France (the most recognized academy in the field of Astronautics) (2018), Eminent Alumnus Award, Veer Surendra Sai University of Technology, Sambalpur (2017), Sarwan Sahota Ryerson Distinguished Scholar Award (2015), Canada Research Chair (2005-2010; 2010-2015), Associate Fellow and Life Member of AIAA (2012), Ontario Early Researcher Award (2006-2011), NSERC Discovery Grant (2007-2012; 2012-2017), Japan Society for the Promotion of Science (JSPS) Fellowship (2001-2003), and Science and Technology Agency (STA) Fellowship (1998-2000). He is the co-editor of Acta Astronautica (2014-2021) and Journal of the Japan Society for Aeronautical Sciences (2018-2021).