Analysis Of Energy Harvesting System Research Articles

Design, Development and Analysis of Energy-Harvesting System

Design, Development and Analysis of Energy-Harvesting System

Response Surface Methodology Analysis of Energy Harvesting System over Pathway Tiles.

This paper presents an experimental analysis of the optimization of PZT-based tiles for energy harvesting. The hardware (actual experiment), PZT-based tiles, were developed using 6 × 6 piezoelectric (PZT-lead zirconate titanate) sensors of 40 mm in diameter on a hard cardboard sheet (300 × 300 mm2). Our experimental analysis of the designed tiles obtained an optimized power of 3.626 mW (85 kg or 0.83 kN using 36 sensors) for one footstep and 0.9 mW for 30 footsteps at high tapping frequency. Theoretical analysis was conducted with software (Design-Expert) using the response surface methodology (RSM) for optimized PZT tiles, obtaining a power of 6784.155 mW at 150 kg or 1.47 kN weight using 34 sensors. This software helped to formulate the mathematical equation for the most suitable PZT tile model for power optimization. It used the quadratic model to provide adjusted and predicted R2 values of 0.9916 and 0.9650, respectively. The values were less than 0.2 apart, which indicates a high correlation between the actual and predicted values. The outcome of the various experiments can help with the selection of input factors for optimized power during pavement design.

Numerical analysis of energy harvesting system including an inclined inverted flag

An inverted flag with the free leading edge and fixed trailing edge has been widely adopted in an energy harvesting system due to its highly unstable characteristics in a flow. In the present study, the non-zero inclination angle is set on the fixed trailing edge of the inverted flag to increase its instability and improve the energy harvesting performance. The effects of the bending rigidity and the inclination angle on the energy harvesting efficiency are numerically analyzed where the interaction between the flag and the surrounding fluid is considered by using an immersed boundary method. The inverted flag shows five flapping motions depending on the bending rigidity and the inclination angle: straight, symmetric, asymmetric, biased, and the over flapping modes. The mode change is observed from the straight mode to the flapping mode by increasing the inclination angle from the zero to non-zero degree, which is favorable in terms of the energy harvesting performance. The optimal efficiency is obtained by the inverted flag at the inclination angle of around 40°–45° corresponding to the biased flapping mode. In the biased flapping mode, the strain energy is continuously produced without a period where energy production drops to zero. The strain energy is quantitatively scaled based on a vortex formation that consists of factors associated with the kinematics of the inverted flag.

Analysis and efficiency measurement of electromagnetic vibration energy harvesting system

This paper deals with the efficiency analysis of developed electromagnetic vibration energy harvesting systems. The efficiency analysis of this energy harvesting system is specified and a linear model of the vibration energy harvesting system is simulated to determine theoretical limits. The influence of individual parameters of vibration energy harvesters is evaluated by the simulation model. Three vibration energy harvesting devices, developed at Brno University of Technology, were measured and their efficiencies were consecutively calculated from the measured data. Vibration tests of these harvesters were done with a lightweight vibrating structure of a steel beam where the effect of the vibration energy harvester operation is noticeable. The effects of used electronics and power management circuit for different levels of excited mechanical vibrations are presented. Realized analyses and measurements will be used for future improvement of vibration energy harvester design; mainly in applications of lightweight vibrating structures where the vibration energy harvester can affect mechanical vibrations in feedback.