Modeling and Simulation of a Piezoelectric Micro-Power Generator (original) (raw)
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This paper presents a mechanical vibration energy scavenging solution for micro power generation. The transduction is performed using a novel resonant cantilever beam SOI structure with a piezoelectric Aluminium Nitride layer. FEA simulation and optimization of such a device is detailed. The simulation results will be compared with experimental data obtained using devices fabricated using a special MEMS process.
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This study is dedicated to investigation of rectang ularand trapezoidal-shaped cantilevers for achieving improved efficiency of th e piezoelectric micropower generation. The developed finite element model of a unimorph piezot ransducer with a proof-mass at the tip is used to examine how different cantilever shapes and proof-mass dimensions influence stress distribution, dynamic response and voltage output o f he microgenerator. Numerical results indicate that cantilevers with increasingly triangu lar shape permit markedly larger kinematic excitation magnitudes and generate slightly larger voltages for a comparable deflection level.
Dynamical Modeling and Simulation of a Laser-micromachined Vibration-based Micro Power Generator
International Journal of Nonlinear Sciences and Numerical Simulation, 2000
The dynamical motion of laser-micromachined copper springs used for a meso-scale vibration-based power generator was successfully modeled using ANSYS to reveal 3 modes of multi-directional vibratory motion due to a pure vertical input vibration. A MATLAB simulation was also used to predict the voltage output of the micro power generator system with coupled electrical and mechanical damping effects. The simulated output matched experimental results closely. These capabilities are essential for the successful design and development of a miniature, low-frequency, and robust micro energy generator that could be potentially used to convert human mechanical energy into usefully electrical power to operate devices such as mobile phones and heart-pacers. Thus far, 1cm 1 meso-scale generators are demonstrated capable of producing up to 4V AC with instantaneous peak power of 80mW, at input frequencies ranging from 60 to 120Hz with ~200μηι input vibration amplitude. A generator capable of producing 2V DC output with 40μ\ν power after voltage rectification, and able to drive a commercial infrared wireless signal transmitter to send 140ms pulse trains with ~60sec power generation time was also demonstrated. The ANSYS model and MATLAB simulation results are presented and compared with the experimental results in this paper.
Piezoelectric Micro-Generator Characterization For Energy Harvesting Application
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This paper presents analysis and characterization of<br> a piezoelectric micro-generator for energy harvesting application.<br> A low-cost experimental prototype was designed to operate as<br> piezoelectric micro-generator in the laboratory. An input acceleration<br> of 9.8m/s2 using a sine signal (peak-to-peak voltage: 1V, offset<br> voltage: 0V) at frequencies ranging from 10Hz to 160Hz generated<br> a maximum average power of 432.4μW (linear mass position =<br> 25mm) and an average power of 543.3μW (angular mass position<br> = 35°). These promising results show that the prototype can be<br> considered for low consumption load application as an energy<br> harvesting micro-generator.
Evaluation of Impact Based Piezoelectric Micro-Power Generator
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Frontiers in Materials, 2016
The purpose of this work is to present recent advances in modeling and design of piezoelectric energy harvesters, in the framework of micro-electro-mechanical systems (MEMS). More specifically, the case of inertial energy harvesting is considered, in the sense that the kinetic energy due to environmental vibration is transformed into electrical energy by means of piezoelectric transduction. The execution of numerical analyses is greatly important in order to predict the actual behavior of MEMS devices and to carry out the optimization process. In the common practice, the results are obtained by means of burdensome 3D finite element analyses (FEA). The case of beams could be treated by applying 1D models, which can enormously reduce the computational burden with obvious benefits in the case of repeated analyses. Unfortunately, the presence of piezoelectric coupling may entail some serious issues in view of its intrinsically threedimensional behavior. In this paper, a refined, yet simple, model is proposed with the objective of retaining the Euler-Bernoulli beam model, with the inclusion of effects connected to the actual three-dimensional shape of the device. The proposed model is adopted to evaluate the performances of realistic harvesters, both in the case of harmonic excitation and for impulsive loads.
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2005
In this paper we report on the design, simulation and initial results of a microgenerator, which converts external vibrations into electrical energy. Power is generated by means of electromagnetic transduction with static magnets positioned either side of a moving coil located on a silicon structure designed to resonate laterally in the plane of the chip. In this paper the development and fabrication of a micromachined microgenerator that uses standard silicon based fabrication techniques and low cost, batch process is presented. Finite element simulations have been carried out using ANSYS to determine an optimum geometry for the microgenerator. Electromagnetic FEA simulations using Ansoft's Maxwell 2D software have shown voltage levels of 4 to 9V can be generated from the single beam generator designs. Initial results at atmospheric pressure yield 0.5µW at 9.81ms -2 and 9.5 kHz and emphasise the importance of reducing unwanted loss mechanisms such as air damping.
Towards a piezoelectric vibration-powered microgenerator
IEE Proceedings - Science, Measurement and Technology, 2001
As MEMS and Smart Material technologies advance, embedded and remote applications are becoming more widespread. Powering these systems can be a significant engineering problem, as traditional solutions such as batteries are not always appropriate. An inertial generator is developed that uses thick-film piezoelectric technologies to produce electrical power from vibrations in the environment of the device. The device validates the concept, and produces an output of 3pW. Predictions show that orders of magnitude increase in power output are possible.
This paper presents a comparison between simulation and experimental findings of energy harnessing from micro-vibration by using piezoelectric vibration-to-electricity converter. Vibrational data used in this study are generated experimentally using magnetic shaker. Since piezoelectric sensor produces an alternate voltage, a rectifier circuit is needed to convert it to a direct voltage. In this study, an instrumentation to harness energy from micro-vibration using non-adaptive circuit has been developed and simulated within Matlab SIMULINK environment. A comparative analysis shows that a maximal power output of 40.5 µW and 29.0 µW could be harnessed for input vibration of 0.075 m/s 2 at 10 Hz frequency, from simulation and experimental, respectively. The amount of energy generated is far smaller than required for the normal operations of most electronic devices. However, this energy could be accumulated and stored until sufficient power has been captured to develop a completely self-powered system.
Experimental Investigation On Piezoelectric And Electromagnetic Hybrid Micro-Power Generator
2016
Piezoelectric micro-generator (MG) is popular due to its high output power density compared to other means of energy harvesting mechanism; however the current generated is relatively low. In the other hand electromagnetic MG is capable to generate higher output current per unit of electrical output power. By combining both of these MGs, they would complement each other in improving the total efficiency of the energy harvesting system. It is verified from the experiment that the hybrid system reduce the capacitor charging time compared to individual system.