A nonlinear piezoelectric shunt absorber with 2:1 internal resonance: experimental proof of concept

2022 ◽  
Author(s):  
Zein Alabidin Shami ◽  
Christophe Giraud-Audine ◽  
Olivier Thomas
Keyword(s):  
Piezoelectric Transducer ◽  
Internal Resonance ◽  
Elastic Structure ◽  
Voltage Source ◽  
Resonant Circuit ◽  
Proof Of Concept ◽  
Experimental Proof ◽  
Resonant Shunt ◽  
Piezoelectric Shunt ◽  
Electrical Mode

Abstract An experimental proof of concept of a new semi-passive nonlinear piezoelectric shunt absorber, introduced theoretically in a companion article, is presented in this work. This absorber is obtained by connecting, through a piezoelectric transducer, an elastic structure to a resonant circuit that includes a quadratic nonlinearity. This nonlinearity is obtained by including in the circuit a voltage source proportional to the square of the voltage across the piezoelectric transducer, thanks to an analog multiplier circuit. Then, by tuning the electric resonance of the circuit to half the value of one of the resonances of the elastic structure, a two-to-one internal resonance is at hand. As a result, a strong energy transfer occurs from the mechanical mode to be attenuated to the electrical mode of the shunt, leading to two essential features: a nonlinear antiresonance in place of the mechanical resonance and an amplitude saturation. Namely, the amplitude of the elastic structure oscillations at the antiresonance becomes, above a given threshold, independent of the forcing level, contrary to a classical linear resonant shunt. This paper presents the experimental setup, the designed nonlinear shunt circuit and the main experimental results.

scholarly journals A single-phase DC-AC dual-active-bridge based resonant converter for grid-connected photovoltaic applications

2021 ◽  
Author(s):  
Marcos Felix Aguirre
Keyword(s):  
High Frequency ◽  
Single Phase ◽  
Current Control ◽  
Energy Resources ◽  
Voltage Source ◽  
Resonant Circuit ◽  
Renewable Energy Resources ◽  
Grid Voltage ◽  
Dual Active Bridge ◽  
Averaged Models

In the wake of the global energy crisis, the integration of renewable energy resources, energy storage devices, and electric vehicles into the electric grid has been of great interest towards replacing conventional, fossil-fuel-dependent energy resources. This thesis presents the circuit topology and a control strategy for a 250-W single-phase gridconnected dc-ac converter for photovoltaic (PV) solar applications. The converter is based on the dual active bridge (DAB) kernel employing a series-resonant link and a high-frequency isolation stage. For interfacing the 60-Hz ac grid with the 78-kHz resonant circuit, the converter utilizes a four-quadrant switch array that functions as an ac-ac stage. Therefore, a bipolar low-frequency voltage source, that is the grid voltage, is used to synthesize a symmetrical high-frequency voltage pulse-train for the resonant circuit. Thus, soft switching and the use of a compact ferrite-core transformer have been possible. Then, a fast current-control loop ensures that the converter injects a sinusoidal current in phase with the grid voltage, while a relatively slower feedback loop regulates the converter dc-side voltage, that is, the PV array voltage, at a desired value. To simulate the converter and to design the controllers, the thesis also presents nonlinear large-signal and linearized small-signal state-space averaged models. The performance of the converter is assessed through simulation studies conducted using the aforementioned averaged models, a detailed topological model in the PLECS software environment, and a prototype. Keywords: Photovoltaic, PV, Microinverter, Dual Active Bridge, Phase-shift Modulation, High Frequency Transformer

Outdoor assessment of solar irradiance using camera: experimental proof of concept and application to MPP identification

Solar Energy ◽  
2019 ◽  
Vol 194 ◽  
pp. 589-601 ◽  
Author(s):  
Mostapha Oulcaid ◽  
Hassan El Fadil ◽  
Leila Ammeh ◽  
Abdelhafid Yahya ◽  
Fouad Giri
Keyword(s):  
Solar Irradiance ◽  
Proof Of Concept ◽  
Experimental Proof

Experimental Proof-of-Concept of HiL Based Virtual Calibration for a Gasoline Engine with a Three-Way-Catalyst

2019 ◽  
Author(s):  
Feihong Xia ◽  
Frank Dorscheidt ◽  
Stefan Lücke ◽  
Jakob Andert ◽  
Pietro Gardini ◽  
...  
Keyword(s):  
Gasoline Engine ◽  
Proof Of Concept ◽  
Experimental Proof ◽  
Three Way Catalyst

Sparse hand-held probe for optoacoustic ultrasound volumetric imaging: an experimental proof-of-concept study

2020 ◽  
Vol 45 (4) ◽  
pp. 885
Author(s):  
Mohammad Azizian Kalkhoran ◽  
François Varray ◽  
Alessandro Stuart Savoia ◽  
Didier Vray
Keyword(s):  
Proof Of Concept ◽  
Experimental Proof ◽  
Volumetric Imaging ◽  
Concept Study

Maritime target detection using GNSS-based radar: Experimental proof of concept

2017 ◽  
Author(s):  
H. Ma ◽  
M. Antoniou ◽  
M. Cherniakov ◽  
D. Pastina ◽  
F. Santi ◽  
...  
Keyword(s):  
Target Detection ◽  
Proof Of Concept ◽  
Experimental Proof

Baroreceptors, baroreceptor unloading, and the long-term control of blood pressure

2005 ◽  
Vol 288 (4) ◽  
pp. R819-R827 ◽  
Author(s):  
Terry N. Thrasher
Keyword(s):  
Animal Studies ◽  
Sympathetic Nerve Activity ◽  
Human Subjects ◽  
Pressure Change ◽  
Proof Of Concept ◽  
Experimental Proof ◽  
Pulsatile Pressure ◽  
Compliance Map ◽  
The Relationship

Whether arterial baroreceptors play a role in setting the long-term level of mean arterial pressure (MAP) has been debated for more than 75 years. Because baroreceptor input is reciprocally related to efferent sympathetic nerve activity (SNA), it is obvious that baroreceptor unloading would cause an increase in MAP. Experimental proof of concept is evident acutely after baroreceptor denervation. Chronically, however, baroreceptor denervation is associated with highly variable changes in MAP but not sustained hypertension. The ability of baroreceptors to buffer imposed increases in MAP appears limited by a process termed “resetting,” in which the threshold to fire shifts in the direction of the pressure change and if the pressure elevation is maintained, it leads to a rightward shift in the relationship between baroreceptor firing and MAP. The most common hypothesis linking baroreceptors to changes in MAP proposes that reduced vascular distensibility in baroreceptive areas would cause reduced firing at the same pulsatile pressure and, thus, reflexively increase SNA. This review focuses on effects of baroreceptor denervation in the regulation of MAP in human subjects compared with animal studies; the relationship between vascular compliance, MAP, and baroreceptor resetting; and, finally, the effect of chronic baroreceptor unloading on the regulation of MAP.

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