题目：Modular Assembly of Origami-Inspired Quasi-Zero Stiffness Metamaterials for Customizable Vibration Isolation Across Variable Loads
时间：2024年10月11日 10:00-12:00
地点：机械与动力工程学院 F310会议室
邀请人：胡开明 副教授（振动、冲击、噪声研究所）
Biography
Jaehyung Ju is an Associate Professor at the University of Michigan - Shanghai Jiao Tong University (UM-SJTU) Joint Institute at Shanghai Jiao Tong University. He was elected as an ASME Fellow in 2023. He is serving as an Associate Editor of the ASME Journal of Engineering Materials and Technology. He received the 2015 Orr Best Paper Award from the ASME Journal of Engineering Materials and Technology and the 2012 Young Engineer of the Year Award from the ASME North Texas Section. He received a Ph.D. from the Department of Mechanical Engineering at Texas A&M University in 2005. His current research interests are the mechanics and design of mechanical metamaterials. His group has published works in top journals in mechanics and multidisciplinary areas, such as Nature Communications, Advanced Materials, Advanced Functional Materials, Physical Review Letters (PRL), Journal of the Mechanics and Physics of Solids (JMPS), ASME Journal of Applied Mechanics, International Journal of Solids and Structures (IJSS), Extreme Mechanics Letters (EML), etc.
Abstract
Suppressing low-frequency vibrations while maintaining load-bearing capacity has long been challenging for linear spring-damper systems. To address this, quasi-zero stiffness (QZS) structures have been developed, offering high static and low dynamic stiffness. However, the conventional design of QZS structures, which combines negative and positive stiffness elements, often lacks clear theoretical guidance for more advanced designs. Additionally, most QZS systems are optimized for a single target load, limiting their practical applicability in scenarios that require vibration isolation across a broad range of loads. This work introduces a novel approach to designing 3D QZS structures by leveraging the kinematic instability of origami-inspired metamaterials. A modular assembly method is also proposed, enabling the construction of QZS vibration isolation systems that can be tailored to various loading ranges. The integration of kinematic instability into the design of QZS metamaterials enhances the robustness of the vibration isolators, while the modularity allows for customizable load-bearing capabilities. The proposed designs are validated through analytical models and experimental tests in both static and dynamic conditions, offering a comprehensive framework for developing advanced QZS metamaterials.
