Explorations of displacement and velocity nonlinearities and their effects to power of a magnetically-excited piezoelectric pendulum

Uzun, Yunus; Kurt, Erol; Kurt, H. Hilal

doi:10.1016/j.sna.2015.01.033

Cited by 27 publications

(12 citation statements)

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“…Moreover, the piezoelectric devices are appropriate to be optimized for a certain excitation frequencies and that can facilitate the raise of the system efficiency, see Kurt et al [22] and Uzun et al [18]. According to Cottone [6], non-linear oscillators can offer the option of broadening the response of vibration energy systems, in that way they can physically respond to changes in driving frequency, Uzun et al [23]. They can also harvest energy from sources where vibrations are present in several frequencies, see Frizzell et al [24] and Cottone et al [25], and [26].…”

Section: Introductionmentioning

confidence: 99%

Power Control Optimization of an Underwater Piezoelectric Energy Harvester

et al. 2018

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Abstract:Over the past few years, it has been established that vibration energy harvesters with intentionally designed components can be used for frequency bandwidth enhancement under excitation for sufficiently high vibration amplitudes. Pipelines are often necessary means of transporting important resources such as water, gas, and oil. A self-powered wireless sensor network could be a sustainable alternative for in-pipe monitoring applications. A new control algorithm has been developed and implemented into an underwater energy harvester. Firstly, a computational study of a piezoelectric energy harvester for underwater applications has been studied for using the kinetic energy of water flow at four different Reynolds numbers Re = 3000, 6000, 9000, and 12,000. The device consists of a piezoelectric beam assembled to an oscillating cylinder inside the water of pipes from 2 to 5 inches in diameter. Therefore, unsteady simulations have been performed to study the dynamic forces under different water speeds. Secondly, a new control law strategy based on the computational results has been developed to extract as much energy as possible from the energy harvester. The results show that the harvester can efficiently extract the power from the kinetic energy of the fluid. The maximum power output is 996.25 µW and corresponds to the case with Re = 12,000.

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Section: Introductionmentioning

confidence: 99%

Power Control Optimization of an Underwater Piezoelectric Energy Harvester

et al. 2018

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“…For the studied range, decreasing load yields to higher power. However, we expect a decrease beyond a certain electric load, which is lower than the impedance of the machine, as occurs usually with electrical devices [41].…”

Section: Resultsmentioning

confidence: 78%

Design optimization study of a torus type axial flux machine

Arslan

Kurt

Akizu

et al. 2018

Journal of Energy Systems

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Axial flux machines are used frequently in wind energy applications due to their high power densities and efficiencies. However, the parametrical dependencies of those generators affect the generated power and efficiencies. For instance, turbine blade structures dimensions, change dramatically the speed and torque characteristics. Hence, this study includes a pursuit of optimization and the related design parameters for an axial generator in terms of its off grid operations. The analytical design relations and simulated data have shown that the geometric dimensions and morphology of the machine can be analyzed effectively under the finite element method and the optimization of the machine can be provided with a good accuracy by applying the response surface optimization. Cogging torque and power density formulated aim function gives a good optimization for the design. According to this approach, the general performance of the machine is maximized and the cogging torque and weight are kept to be decreased. Design variables are optimized by considering the generator size. Consequently, an optimal 4.8% increase in weight can yield to a 27.4% power enhancement in the machine.

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“…Many difficulties at the PZT vibration energy harvesters design are because the output impedance of piezoelectric energy source and input impedance of electric sink should be matched at the frequency spectrum of mechanical vibrations. For the lightweight host vibrating structure, energy harvesting significantly increases a structural damping [3,4,6,7]. To enhance the efficiency of energy transformation, a multitude of various remedies for the load electric circuits are offered.…”

Section: Introductionmentioning

confidence: 99%

“…Among many types of piezoelectric transducer, the power piezoelectric stacks are best suited to transform the ambient mechanical vibration to the electric energy due to their ability to perceive high force excitations [4,6,8]. Some works [8] construct and then use the analytical models of high power harvesters based on PZT stacks, but due to complexity of their analysis, the lumped models of PZT stacks [6] that are usually derived from preliminary experiments or FE investigation can be coupled and solved conjointly with an equation of electric circuit in a frequency domain.…”

Section: Introductionmentioning

confidence: 99%

“…Some works [8] construct and then use the analytical models of high power harvesters based on PZT stacks, but due to complexity of their analysis, the lumped models of PZT stacks [6] that are usually derived from preliminary experiments or FE investigation can be coupled and solved conjointly with an equation of electric circuit in a frequency domain. For our study that is oriented to the transform of mechanical vibrations generated by moving transporters, it is important to note that even first resonance frequency of the stiff PZT stack is considerably higher of the frequency of mechanical excitations [4].…”

Section: Introductionmentioning

confidence: 99%

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