Dr. Yabin Liao Profile

KEYWORDS: Piezoelectric effects, Piezoresistive sensors, Ferroelectric materials, Energy harvesting, Interfaces, Electromechanical design, Systems modeling, Sensors

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Proceedings Article | 22 April 2020 Paper

Power and electromechanical coupling of nonlinear piezoelectric vibration energy harvesters

Chunbo Lan, Yabin Liao, Guobiao Hu, Lihua Tang

Proceedings Volume 11376, 113761I (2020) https://doi.org/10.1117/12.2557872

KEYWORDS: Energy harvesting, Numerical simulations

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Proceedings Article | 21 March 2019 Presentation + Paper

Tuning, power and efficiency of piezoelectric vibration energy harvesters

Yabin Liao

Proceedings Volume 10967, 109672F (2019) https://doi.org/10.1117/12.2507265

KEYWORDS: Energy efficiency, Energy harvesting, Systems modeling

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Proceedings Article | 21 March 2019 Presentation + Paper

Generalized modeling and analysis of piezoelectric vibration energy harvesters

Yabin Liao, Junrui Liang

Proceedings Volume 10967, 1096724 (2019) https://doi.org/10.1117/12.2507256

KEYWORDS: Energy harvesting, Interfaces, Systems modeling, Piezoelectric effects, Piezoresistive sensors

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This paper presents a unified model of piezoelectric vibration energy harvesters through the use of a generalized electrical impedance that represents various energy harvesting interfaces, providing a universal platform for the analysis and discussion of energy harvesters. The unified model is based on the equivalent circuit analysis that utilizes the impedance electromechanical analogy to convert the system into the electrical domain entirely, where the model is formulated and analyzed. Firstly, the common behaviors of energy harvesters under this unified model are discussed, and the concept of power limit is discussed. The power limit represents the maximum possible power that could be harvested by an energy harvester regardless of the type of the circuit interface. The condition to reach this power limit is obtained by applying the impedance matching technique. Secondly, three representative energy harvesting interfaces, i.e., resistive (REH), standard (SEH), and synchronized switch harvesting on inductor (SSHI), are discussed separately, including their corresponding forms of the generalized electrical impedance and associated system behaviors. As an important contribution, a clear explanation of the system behavior is offered through an impedance plot that graphically illustrates the relationship between the system tuning and the harvested power. Thirdly, the effect of the system electrometrical coupling on power behaviors is discussed. As another important contribution, this paper derives and presents the analytical expressions of the critical coupling of the interfaces, which is the minimum coupling required to reach the power limit and also the parameter used to define the coupling state, i.e., weakly, critically, or strongly, of a system. In particular, the analytical expressions for the SEH and SSHI interfaces are presented for the first time in the research community. Lastly, the system behaviors and critical coupling of the three energy harvesting interfaces are compared and discussed. The SSHI interface has the lowest critical coupling, which explains its superior power harvesting capability for weakly coupled systems.

Proceedings Article | 22 March 2018 Presentation + Paper

Optimal power, power limit, and damping of vibration piezoelectric power harvesters

Yabin Liao, Henry Sodano

Proceedings Volume 10596, 105961S (2018) https://doi.org/10.1117/12.2307483

KEYWORDS: Electromagnetism, Resistance, Systems modeling, Wind energy, Motion models, Mathematical modeling, Capacitance, Energy harvesting, Ferroelectric materials, Analytical research

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Power harvesting describes the process of acquiring the ambient energy surrounding a system and converting it into usable electrical energy. Much of the work over the past two decades has focused on the conversion of ambient vibration energy sources using piezoelectric, electromagnetic and electrostatic transduction. Attempts were made to obtain a general model that could be applied to any transduction mechanism. Of the most interest is an electromagnetic generator model that was used by many researchers to model piezoelectric power harvesters. Two major results from the model are the power limit expression and the equal relationship between the electrically induced damping and the mechanical damping to reach the power limit. However, piezoelectric power harvesters cannot be accurately modeled by this electromagnetic model due to the essential difference in physics. There have also been attempts to obtain the power limit expression based on piezoelectric relationships, but they either neglect the piezoelectric backward coupling to the structure, or assume the power limit occurs at the resonance of the system. This paper obtains the power limit expression based on the piezoelectric coupled equations without those assumptions. In addition, the relationship between the electrically induced damping and mechanical damping at the power limit is studied. Furthermore, a closed-form criterion is derived and proposed to define strongly and weakly coupling power harvesters, whose differences in power characteristics are explained through analytical and numerical analysis. While most of the discussion is focused on linear power harvesters connected to a resistive circuit, the aim of this paper is to provide a comprehensive and deep understanding of this simple configuration, answers to important questions, and a starting point to develop a more general theory on power harvesters because similar system characteristics are observed in power harvesters with more complexities.

Proceedings Article | 27 April 2011 Paper

Optimal parameters and power characteristics of piezoelectric energy harvesters with an RC circuit

Yabin Liao, Yirong Lin, Henry Sodano

Proceedings Volume 7977, 79770W (2011) https://doi.org/10.1117/12.881130

KEYWORDS: Capacitance, Resistance, Capacitors, Energy harvesting, Electroluminescence, Systems modeling, Wind energy, Ferroelectric materials, Sensors, Composites

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Proceedings Article | 7 April 2009 Paper

On structural effects and energy conversion efficiency of power harvesting

Yabin Liao, Henry Sodano

Proceedings Volume 7288, 72880W (2009) https://doi.org/10.1117/12.814891

KEYWORDS: Energy conversion efficiency, Resistance, Energy harvesting, Energy efficiency, Systems modeling, Ferroelectric materials, Mechanical efficiency, Sensors, Aluminum, Power supplies

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