A multimodal hybrid energy harvester based on piezoelectric-electromagnetic mechanisms for low-frequency ambient vibrations

Hybrid vibration and wind energy harvesting using combined piezoelectric and electromagnetic conversion for bridge health monitoring applications

A review on design improvements and techniques for mechanical energy harvesting using piezoelectric and electromagnetic schemes

Capturing energy from ultra-low frequency vibrations and human motion through a monostable electromagnetic energy harvester

A nonlinear two-degree-of-freedom electromagnetic energy harvester for ultra-low frequency vibrations and human body motions

Energy generation in a hybrid harvester under harmonic excitation

Dynamic vibration absorbers (DVAs) have proven to be an effective passive technique to suppress device vibration, with many realistic implementations in structures, buildings, and machines. Vibration energy harvesting is a process used to convert unwanted vibrations of a host structure into electrical energy. In this paper, a harmonic single degree-of-freedom system is considered consisting of a pendulum absorber and electromagnetic energy harvesting transduction mechanism. These types of DVAs are suitable for control of multi-story buildings, where for the simplicity of analysis a two degree-of-freedom system which models the building with the absorber is considered. Controlling the vibrations of buildings is the primary objective, and harvesting the energy from the dynamic vibration pendulum absorber at the same time is the secondary objective. Parametric analyses are performed. It is observed that proper system parameter selection is key for reducing the vibration amplitude of the primary system and for enhancing the energy harvested from the secondary system. Optimization analysis based on the genetic algorithm approach is used to optimize the system parameters. It is observed that with a proper selection of parameters, wideband energy can be harvested along with reduction in vibration of the building.

Energy Harvesting From Dynamic Vibration Pendulum Absorber

Energy harvesting from structural vibration using piezoelectric material has received much attention in the past few years. The idea is to scavenge energy out of a vibrating host. Coupling energy harvesting with structural vibration control is a challenging task due to conflicting goals. But dynamic vibration absorbers (DVA) used to reduce vibrations in the primary structure has potential for energy harvesting capability. In this mechanism the host structure vibration is reduced by suitably shifting the motion to DVA. Vibration energy in DVA can be harvested. The harvested energy can be used to power low-powered wireless sensor systems. This paper analyses the prospect of using vibration absorbers for possible energy harvesting under random excitation. To achieve this goal, vibration absorber is supplemented with a piezoelectric stack for both vibration confinement and energy harvesting. The primary goal is to control the vibration of the host structure and the secondary goal is to harvest energy out of the dynamic vibration absorber simultaneously. It is shown that with a proper choice of harvester parameters a broadband energy harvesting can be obtained combined with vibration reduction in the primary structure. Analytical studies are carried out considering stationary Gaussian white noise excitation within the frequency band of interest. Finally a single storey building under seismic excitation is considered and numerical results of structural control and energy harvested are shown.

Energy harvesting dynamic vibration absorber under random vibration

An energy harvesting dynamic vibration absorber (EHDVA) is studied to suppress undesirable vibrations in a host structure as well as to harvest electrical energy from vibrations using piezo...

Parametric Uncertainty and Random Excitation in Energy Harvesting Dynamic Vibration Absorber

This manuscript discusses a magnetically coupled nonlinear hybrid piezo-electromagnetic energy harvester under harmonic base motion. Linear energy harvester works optimally when the natural frequency of the harvester meets the resonating frequency, elsewhere harvested power falls drastically. Most of the ambient vibration sources are random in nature. Hence, considering the realistic application, narrowband linear vibration energy harvesters are inefficient. Alternatively, nonlinear energy harvesters are capable of producing the electrical power over a broad frequency range. Hence, to acquire the optimum power in the broader frequency range, a magnetically coupled hybrid piezo-electromagnetic energy harvester is developed. In this current work, a tip loaded unimorph piezo cantilever beam configuration is used to scavenge electrical energy from the strain developed in the piezoelectric patch and spring-magnetic mass attached to another end of the cantilever beam with solenoid arrangements are used to scavenge electrical energy from the relative motion between magnetic mass and solenoid. This hybrid harvester is coupled with magnetic oscillators to introduces nonlinearity in the developed harvester. This paper compares, the energy harvested from the hybrid harvester with that of conventional piezoelectric and electromagnetic harvesters for both linear and nonlinear systems.

M. Rajarathinam

Papers

Energy generation in a hybrid harvester under harmonic excitation

Energy Harvesting From Dynamic Vibration Pendulum Absorber

Energy harvesting dynamic vibration absorber under random vibration

Parametric Uncertainty and Random Excitation in Energy Harvesting Dynamic Vibration Absorber

A Nonlinear Hybrid Energy Harvester