Energy Harvesting From Bistable Systems Under Random Excitation

• Autorzy: Lentz L. , Nguyen H. T. , von Wagner U.
• Języki publikacji: EN

Abstrakty

EN

The transformation of otherwise unused vibrational energy into electric energy through the use of piezoelectric energy harvesting devices has been the subject of numerous investigations. The mechanical part of such a device is often constructed as a cantilever beam with applied piezo patches. If the harvester is designed as a linear resonator the power output relies strongly on the matching of the natural frequency of the beam and the frequency of the harvested vibration which restricts the applicability since most vibrations which are found in built environments are broad-banded or even totally random. A possible approach to overcome this restriction is the use of permanent magnets to impose a nonlinear restoring force on the beam that leads to a broader operating range due to large amplitude motions over a large range of excitation frequencies. In this paper such a system is considered introducing a refined modeling with multiple spacial ansatz functions and a refined modeling of the magnet beam interaction. The corresponding probability density function in case of random excitation is calculated by the solution of the corresponding Fokker-Planck equation and compared with results from Monte Carlo simulations. Finally some measurements of ambient excitations are discussed.

Słowa kluczowe

EN

energy harvesting; bistable oscillator; random excitation; Fokker-Planck equation; ambient excitation

• Wydawca: Oficyna Wydawnicza Politechniki Warszawskiej
• Czasopismo: Machine Dynamics Research
• Rocznik: 2017
• Tom: Vol. 41, No. 1
• Strony: 5--16
• Opis fizyczny: Bibliogr. 21 poz., il., rys., wykr.

Twórcy

autor

Lentz L.

• Technische Universität Berlin, Chair of Mechatronics and Machine Dynamics, Department of Applied Mechanics

autor

Nguyen H. T.

• Technische Universität Berlin, Chair of Mechatronics and Machine Dynamics, Department of Applied Mechanics

autor

von Wagner U.

• Technische Universität Berlin, Chair of Mechatronics and Machine Dynamics, Department of Applied Mechanics

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