Method for controlling vibration by exploiting piecewise-linear nonlinearity in energy harvesters.

Area of Science:

• Mechanical Engineering
• Energy Harvesting
• Nonlinear Dynamics

Background:

• Vibration energy harvesting is a key area for alternative energy generation.
• Existing linear harvesters have limited frequency adaptability.
• Current nonlinear harvesters may lack efficiency at resonance.

Purpose of the Study:

• To propose and investigate a piecewise-linear (PWL) nonlinear vibration energy harvester.
• To develop a control method for optimizing the harvester's performance.
• To demonstrate the adaptability and effectiveness of the proposed system.

Main Methods:

• Development of a theoretical model for a PWL nonlinear vibration harvester.
• Numerical investigation of the harvester's behavior.
• Implementation of a control strategy involving response prediction, signal measurement, and gap adjustment.

Main Results:

• The proposed harvester exhibits automatic frequency tunability by adjusting the gap size.
• The system overcomes the narrow frequency limitations of linear harvesters.
• Performance is improved compared to existing nonlinear harvesters, especially at resonance.

Conclusions:

• The PWL nonlinear vibration energy harvester offers adaptable and efficient energy generation.
• The proposed control method optimizes performance across diverse excitation conditions.
• This technology has broad potential applications in various fields requiring vibration energy harvesting.