Multiple piezo-patch energy harvesters integrated to a thin plate with AC-DC conversion: analytical modeling and numerical validation

Aghakhani, Amirreza; Basdogan, Ipek; Ertürk, Alper

doi:10.1117/12.2219079

Cited by 4 publications

(3 citation statements)

References 24 publications

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“…A backup battery or a super capacitor needs to be incorporated into the pacemaker as well to store the generated energy for when it is needed. Several groups have studied power management circuits (PMC), rectification circuit by using equivalent impedance approach [26][27][28], and supercapacitors for small energy harvester [29,30]. Our EH harvester is designed to generate more than m 10 W to compensate for the power loss in available PMCs in the market.…”

Section: Design Constraints and Objectivesmentioning

confidence: 99%

Experimental investigation of fan-folded piezoelectric energy harvesters for powering pacemakers

Ansari

Karami

2017

Smart Mater. Struct.

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This paper studies the fabrication and testing of a magnet free piezoelectric energy harvester (EH) for powering biomedical devices and sensors inside the body. The design for the EH is a fan-folded structure consisting of bimorph piezoelectric beams folding on top of each other. An actual size experimental prototype is fabricated to verify the developed analytical models. The model is verified by matching the analytical results of the tip acceleration frequency response functions (FRF) and voltage FRF with the experimental results. The generated electricity is measured when the EH is excited by the heartbeat. A closed loop shaker system is utilized to reproduce the heartbeat vibrations. Achieving low fundamental natural frequency is a key factor to generate sufficient energy for pacemakers using heartbeat vibrations. It is shown that the natural frequency of the small-scale device is less than 20 Hz due to its unique fan-folded design. The experimental results show that the small-scale EH generates sufficient power for state of the art pacemakers. The 1 cm3 EH with18.4 gr tip mass generates more than16 μW of power from a normal heartbeat waveform. The robustness of the device to the heart rate is also studied by measuring the relation between the power output and the heart rate.

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Section: Design Constraints and Objectivesmentioning

confidence: 99%

Experimental investigation of fan-folded piezoelectric energy harvesters for powering pacemakers

Ansari

Karami

2017

Smart Mater. Struct.

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“…More recently, Aghakhani et. al 24,25 have presented both equivalent circuit modeling and analytical distributed-parameter expressions for DC electrical output of the multiple piezo-patch harvesters attached to a thin plate.…”

Section: Introductionmentioning

confidence: 99%

Multiple piezo-patch energy harvesters on a thin plate with respective AC-DC conversion

Aghakhani

Basdogan

2018

Active and Passive Smart Structures and Integrated Systems XII

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Piezoelectric patch energy harvesters can be directly integrated to plate-like structures which are widely used in automotive, marine and aerospace applications, to convert vibrational energy to electrical energy. This paper presents two different AC-DC conversion techniques for multiple patch harvesters, namely single rectifier and respective rectifiers. The first case considers all the piezo-patches are connected in parallel to a single rectifier, whereas in the second case, each harvester is respectively rectified and then connected in parallel to a smoothing capacitor and a resistive load. The latter configuration of AC-DC conversion helps to avoid the electrical charge cancellation which is a problem with the multiple harvesters attached to different locations of the host plate surface. Equivalent circuit model of the multiple piezo-patch harvesters is developed in the SPICE software to simulate the electrical response. The system parameters are obtained from the modal analysis solution of the plate. Simulations of the voltage frequency response functions (FRFs) for the standard AC input-AC output case are conducted and validated by experimental data. Finally, for the AC input-DC output case, numerical simulation and experimental results of the power outputs of multiple piezo-patch harvesters with multiple AC-DC converters are obtained for a wide range of resistive loads and compared with the same array of harvesters connected to a single AC-DC converter.

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“…The analytical and numerical methods for obtaining the equivalent circuit parameters of beam harvesters have been presented in the literature. 9 More recently, Aghakhani et al 10 developed the multi-modal analytical and numerical approach for identifying the equivalent circuit parameters of multiple piezo-patches attached on a thin plate.…”

Section: Introductionmentioning

confidence: 99%

Passive vibration control of a plate via piezoelectric shunt damping with FEM and ECM

Motlagh

Aghakhani

Basdogan

2018

Smart Materials and Nondestructive Evaluation for Energy Systems IV

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Two-dimensional thin plates are widely used in many aerospace, automotive and marine applications. Vibration attenuation can be achieved in these structures by attaching piezoelectric elements on to the structure integrated with shunt damping circuits. This enables a compact vibration damping method without adding significant mass and volumetric occupancy, unlike the bulky mechanical dampers. Practical implementation of shunt damping technique requires accurate modeling of the host structure, the piezoelectric elements and the dynamics of the shunt circuit. Unlike other studies in the literature of piezoelectric shunt damping, this work utilizes a multi-modal equivalent circuit model (ECM) of a thin plate with multiple piezo-patches, to demonstrate the performance of shunt circuits. The equivalent system parameters are obtained from the modal analysis solution based on the Rayleigh-Ritz method. The ECM is coupled to the shunt circuits in SPICE software, where the shunt configuration consists of three branches of electrical resonators, each tuned to one vibration mode of the structure. Using the harmonic analysis in SPICE for a range of excitation frequencies, current output of each ECM branch is calculated for open-circuit and optimum shunt circuit conditions. The current of ECM branches are then converted to the displacement outputs in physical coordinates and validated by the finite-element simulations in ANSYS. It is shown that the vibration attenuation of a vibration mode can be successfully achieved when there is a reduction in the corresponding current amplitude of the ECM branch. This correlation can be utilized in the design of efficient linear/nonlinear shunt circuits.

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Multiple piezo-patch energy harvesters integrated to a thin plate with AC-DC conversion: analytical modeling and numerical validation

Cited by 4 publications

References 24 publications

Experimental investigation of fan-folded piezoelectric energy harvesters for powering pacemakers

Experimental investigation of fan-folded piezoelectric energy harvesters for powering pacemakers

Multiple piezo-patch energy harvesters on a thin plate with respective AC-DC conversion

Passive vibration control of a plate via piezoelectric shunt damping with FEM and ECM

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