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Main Title: Energy Harvesting From Bistable Systems Under Random Excitation
Author(s): Lentz, Lukas
Nguyen, Huy The
Wagner, Utz von
Type: Article
Language Code: en
Abstract: 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 stochastic in nature. 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 a modal expansion that incorporates two modal 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.
Issue Date: 2017
Date Available: 20-Mar-2020
DDC Class: 620 Ingenieurwissenschaften und zugeordnete Tätigkeiten
Subject(s): energy harvesting
bistable oscillator
random excitation
Fokker-Planck equation
ambient excitation
Sponsor/Funder: DFG, 253161314, Untersuchung des nichtlinearen dynamischen Verhaltens von stochastisch erregten Energy Harvesting Systemen mittels Lösung der Fokker-Planck-Gleichung
Journal Title: Machine Dynamics Research
Publisher: Institute of Machine Design Fundamentals
Publisher Place: Warsaw
Volume: 41
Issue: 1
Page Start: 5
Page End: 16
EISSN: 2080-9948
Appears in Collections:FG Mechatronische Maschinendynamik » Publications

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