Our research explores innovative vibration energy harvesting technologies for sustainable and autonomous microelectronic systems. We employ nonlinear dynamics, broadband response mechanisms, and parametric resonances to improve the efficiency and adaptability of vibration energy harvesters under real operating conditions, combining theoretical modelling with experimental validation. Our work supports the development of self-powered sensors, wireless monitoring technologies, and low-power devices for IoT and Industry 4.0 applications, enabling smart and energy-efficient engineering systems.