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Optimum design of a multi-modal vibration energy harvester / Mina Refaat Roushdy Dawoud Mikhail ; Supervised Hesham Ahmed Hegazi , Mustafa Hani Arafa

By: Contributor(s): Material type: TextTextLanguage: English Publication details: Cairo : Mina Refaat Roushdy Dawoud Mikhail , 2016Description: 80 P. : photographs ; 30cmOther title:
  • التصميم الامثل لحصاد طاقه متعدد الانماط من الاهتزاز [Added title page title]
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Dissertation note: Thesis (M.Sc.) - Cairo University - Faculty of Engineering - Department of Mechanical Design and Production Summary: This work presents the design and optimization of a multi-modal vibration energy harvester to enable extracting energy from wideband excitations. The harvester consists of a tapered cantilever beam having a straight longitudinal slit that extends from the beam tip, partially dividing the beam into two sub-beams. Each sub-beam carries a proof mass and a permanent magnet at its tip. The two permanents magnets oscillate past stationary coils in order to convert the mechanical motion into electrical energy. The main system design variables, namely the beam geometry, slit length, mass values and their positions affect the harvester{u2019}s natural frequencies and output power. The beam is optimized to exhibit four closely-spaced natural frequencies with comparable output power levels from each mode in order to obtain efficient operation across a desirable bandwidth. A finite element model is developed to predict the dynamic performance of the beam under harmonic excitation. A genetic algorithm and two objective functions are used to obtain optimized values of the design parameters. Findings of the analytical model are verified experimentally
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Item type Current library Home library Call number Copy number Status Date due Barcode
Thesis Thesis قاعة الرسائل الجامعية - الدور الاول المكتبة المركزبة الجديدة - جامعة القاهرة Cai01.13.13.M.Sc.2016.Mi.O (Browse shelf(Opens below)) Not for loan 01010110072051000
CD - Rom CD - Rom مخـــزن الرســائل الجـــامعية - البدروم المكتبة المركزبة الجديدة - جامعة القاهرة Cai01.13.13.M.Sc.2016.Mi.O (Browse shelf(Opens below)) 72051.CD Not for loan 01020110072051000

Thesis (M.Sc.) - Cairo University - Faculty of Engineering - Department of Mechanical Design and Production

This work presents the design and optimization of a multi-modal vibration energy harvester to enable extracting energy from wideband excitations. The harvester consists of a tapered cantilever beam having a straight longitudinal slit that extends from the beam tip, partially dividing the beam into two sub-beams. Each sub-beam carries a proof mass and a permanent magnet at its tip. The two permanents magnets oscillate past stationary coils in order to convert the mechanical motion into electrical energy. The main system design variables, namely the beam geometry, slit length, mass values and their positions affect the harvester{u2019}s natural frequencies and output power. The beam is optimized to exhibit four closely-spaced natural frequencies with comparable output power levels from each mode in order to obtain efficient operation across a desirable bandwidth. A finite element model is developed to predict the dynamic performance of the beam under harmonic excitation. A genetic algorithm and two objective functions are used to obtain optimized values of the design parameters. Findings of the analytical model are verified experimentally

Issued also as CD

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