Session: 01-02-01: Topological Phononics

Paper Number: 172673

Harnessing Anisotropy in Discrete Magnetoelastic Lattice for Tunable Topological Phase Transition 

Vibration control is a pivotal concern in engineering, with implications spanning structural health monitoring, energy harvesting, and noise reduction. Traditional methods for vibration suppression, including passive damping materials and active control systems, often lack the adaptability required for dynamic environments and typically necessitate external energy inputs. In this context, we present a novel tunable vibration control system that utilizes local anisotropy in bending stiffness to achieve selective localization of vibration energy, thereby enhancing the system's efficiency and effectiveness.

Our study introduces a zigzag array of cantilever elements, each equipped with a magnet, which interact through modulated repulsive forces. This innovative configuration allows for the tuning of coupling strength by varying the orientation of the cantilevers. Specifically, we demonstrate that a cantilever orientation of -30° results in robust topological edge localization of vibration energy, while a +30° orientation leads to delocalized vibration modes. This tunability is achieved without the need for complex control systems, offering a real-time adaptable solution to vibration management.

The fundamental principle behind our approach lies in the manipulation of local anisotropy in bending stiffness, which enables precise control over vibration propagation within the structure. By adjusting the geometric configurations of the cantilevers, we can effectively confine vibrations to specific regions, making this system particularly advantageous for applications in energy harvesting and vibration-based signal processing. Our experimental results validate the effectiveness of this system, showcasing its robustness against structural defects and disorder, which is critical for applications in uncertain environments.

Furthermore, we explore the implications of our findings for future engineering applications. The ability to dynamically tune vibration localization opens new avenues for the design of impact-resistant structures and advanced energy harvesting devices. By leveraging the unique properties of magnetoelastic lattices, our system not only addresses the limitations of conventional vibration control methods but also paves the way for innovative solutions in the field of vibration-based sensing and structural optimization.

In conclusion, our research highlights the potential of tunable vibration control systems that harness anisotropic properties for effective energy localization. The demonstrated robustness and adaptability of our system position it as a viable candidate for a range of engineering applications, from structural health monitoring to advanced energy harvesting technologies. We consider further exploration and collaboration in this exciting area of research, as we continue to refine and expand the capabilities of tunable vibration control systems, ultimately contributing to the advancement of smart materials and structures in modern engineering.

Presenting Author: Taehwa Lee Toyota Motor North America

Presenting Author Biography: Taehwa Lee is a principal research scientist at Toyota Motor North America, where he leads innovative projects focused on sound and vibration control. With a deep expertise in acoustic metamaterials, Taehwa is at the forefront of developing advanced solutions that enhance vehicle performance and passenger comfort. His work involves researching and applying cutting-edge technologies to effectively manage noise and vibrations.

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