演讲人 Speaker：奚风丰教授 

题目 Title: A Framework for Morphing Wing Research 

时间 Date：2022 年 10 月 25 日       Time：晚上 20：00 ~ 21：00 

地点 Venue： 腾讯会议号 316497257   

内容摘要（Abstract）：  

In this talk, a framework for morphing wing research will be presented covering three topics: morphing module design, morphing mechanism and morphing skin. A complete morphing wing should be constructed by a set of modules, each of which is composed of a morphing mechanism covered by a morphing skin.     Under the first topic, an Aero-Kineto-Structure (AKS) analysis and design method is developed comprising three elements: module determination, module design and module optimization. To determine the number of modules, a two-stage aerodynamics method is put forward first to discretize a continuous wing into a number of segments for each flight regime, e.g. climb, cruise, descent, and then to consolidate the different sets of segments into a single set of modules for a morphing wing. To design a morphing module with both mobility and structural rigidity, mechanism kinematics and structural mechanics are combined for devising a morphing structure. At last, these modules are optimized with a system level objective of minimum weight as well as the objective of each discipline: i) aerodynamics: minimum drag, ii) structure: maximum stiffness, iii) motion: maximum stability.     Under the second topic, two mechanisms are proposed: i) Variable Geometry Wing Box (VGWB) for wing level morphing and ii) Adaptive Linkage Array (ALA) for airfoil level morphing. The goal of morphing mechanism design is to minimize the number of actuators while maintaining system structure rigidity. The VGWB is designed based on the Variable Geometry Truss Manipulator (VGTM) by the addition of lockable passive members for the realization of structure morphing and locking. The ALA is designed based on Assur Groups to realize the structure morphing and locking by a single actuator.     Under the third topic, three morphing skins are investigated: i) sliding skin, ii) multi-stable composite skin, iii) compliant panel. The sliding skin is designed by using the rigid panels that are connected to a morphing mechanism. The multi-stable composite skin is created by combining a set of bi-stable composites in a grid pattern. The compliant panel is developed based on the principle of continuum mechanisms. A comparison study is conducted for the three skin designs. 

     个人简介(About the speaker): 

Fengfeng (Jeff) Xi is a Professor with the Department of Aerospace Engineering of Ryerson University and the Director for Ryerson Institute for Aerospace Design and Innovation (RIADI). He received a PhD from the University of Toronto and worked as a project leader for the National Research Council of Canada. Over the last number of years, he has been working on morphing wing research and currently serves as the Natural Sciences and Engineering Research Council of Canada (NSERC) Senior Industrial Research Chair in the areas of advanced interiors and systems. He will serve as the Conference Chair for 2021 IEEE/IFToMM International Conference on Reconfigurable Mechanisms and Robots.