3D Scanning Vibrometer System for Measurements of Multi-Dimensional Motion Manifested in Morphing Wings, Metamaterial Structures, and Autonomous Systems
Abstract
Publicly releasableThis DURIP proposal requests a three-dimensional scanning laser Doppler vibrometer (LDV) to support and strengthen several active DoD-related research outcomes at the University of Michigan (U-M). These include the identification and characterization of auxetic metamaterials integrated with antenna designs (Tol); understanding of avian-inspired morphing surfaces (Inman); advancing the fundamental understanding of topological mechanics (Mao, Sun), 3D topological metastructures (Wang) and smart hypersoniccontrol surfaces (Inman); characterization of ensonified objects (Popa); understanding the role of ultrasound in the advancement ofautonomous systems (Epureanu, Lu, Popa); and creating adaptive systems (Wang). The requested equipment, a PSV-QTec-3D scanning LDV from Polytec Inc., has three-dimensional measurement capability up to 25 MHz with vibrational velocities of 0.01 µm/s to 30 m/s. The3D LDV system can quickly collect and process data to identify operational deflection shapes and eigenfrequencies and enable close correlation to the theoretical models. Understanding and accurately measuring the deflection shapes of mechanical and aerospace structures is crucial for validating the theoretical or computational models developed for the state-of-the-art systems of DoD. For instance, the actual 3D map of the morphing wing surfaces is essential to model and validate the mechanics of the morphing surface and state interface algorithms of the unmanned aerial vehicle (UAV) wings. While the morphing surfaces are very stiff, they are actuated by point sources which will cause nonuniform deflections in the control surface; hence, 3D vibrometry is essential to capture these effects. Furthermore, comprehensive measurements of both out-of-plane and in-plane structural vibration and wave propagation are crucial to understanding and implementing novel metamaterials, including auxetic metamaterials, metastructures, and topological metamaterials in various applications. The topological states of matter realized in mechanical systems lead to novel metamaterials with unprecedented features in directing elastic/acoustic waves, from non-reciprocity to reconfigurable surface stiffness distributions. Because these topological states/modes are mainly composed of in-plane motions of 2D metamaterials, the capability of probing and characterizing in-plane motion with a 3D LDV is an essential technology to validate the topological theory. Moreover, relevant to the DoDmissions, U-M researchers create mechano-intelligent metastructures that will self-reconfigure to adaptively block time-varying excitations via bandgap tuning autonomously. Such a study will form the basis for developing new adaptive structure technologies for military ground vehicles to isolate noise and vibration to protect personnel and onboard instruments and/or reduce acoustic signaturesfor stealth missions. Accurate and comprehensive measurements of multi-directional motion in these structures are the key to advancing this basic science. In addition, ultrasound techniques to advance autonomous systems can greatly benefit from quick mapping of vibrating surfaces via 3D vibrometry, which will also allow accurate acoustic characterization of the designed ensonified objects to study marine mammal behavior. Overall, the proposed equipment will promote a better understanding of the avian-inspired smart morphing surfaces, advance autonomous systems with adaptive structures and ultrasound techniques, and enable multi-directional measurements of multi-dimensional structural vibration and wave propagations in metamaterials and metastructures, which is currently not possible at the U-M research laboratories. The equipment will enable U-M researchers to perform cutting-edge research in DoD-relevant technical areas. In addition to enhancing current research capabilities, acquiring 3D LDV will establish new research and educational subjects at U-M.
Document Details
- Document Type
- DoD Grant Award
- Publication Date
- Jan 24, 2024
- Source ID
- N000142412139
Entities
People
- Şerife Tol
Organizations
- Board of Regents of the University of Michigan
- Office of Naval Research
- United States Navy