Multi-modal Microvibration Energy Harvester Based on Internal Resonance

The rapid advancement of wearable electronics and wireless sensors has sparked a growing demand for reliable and efficient power sources, particularly in challenging environments such as aerospace and deep-sea applications. Traditional chemical batteries often fall short in these scenarios, highlighting the need for innovative energy harvesting technologies. This chapter introduces a groundbreaking micro-vibration energy harvester that capitalizes on the principles of internal resonance and multi-modal structures to convert ambient kinetic energy into electrical energy with remarkable efficiency. The harvester features a compact design, incorporating an outer and inner mass connected by spiral beams, and utilizes nonlinear magnetic forces to achieve a 1:2 internal resonance ratio. This design enables the device to harvest energy across a broad frequency range, significantly enhancing its effectiveness in real-world applications. Through detailed theoretical derivations and comprehensive simulation analyses, the chapter explores the dynamic behavior of the harvester, demonstrating its ability to broaden the 3dB frequency bandwidth and improve energy conversion efficiency. The harvester's unique mechanism makes it a promising alternative power source for a wide range of applications, from wearable electronics to wireless sensors and beyond.