پديد آورنده :
اشتهارديها، رضا
عنوان :
برداشت انرژي از يك تير دوگانه گيردار داراي رزونانس داخلي
مقطع تحصيلي :
كارشناسي ارشد
گرايش تحصيلي :
طراحي كاربردي
محل تحصيل :
اصفهان : دانشگاه صنعتي اصفهان
صفحه شمار :
سيزده، 108ص. : مصور(رنگي)، جدول، نمودار
استاد مشاور :
سعيد ضيايي راد
توصيفگر ها :
برداشت انرژي , تير دوگانه گيردار , ارتعاشات غيرخطي , تشديد داخلي , مودهاي فرضي , روش مقياس هاي زماني چندگانه
استاد داور :
حسن نحوي، علي لقماني
تاريخ ورود اطلاعات :
1399/06/29
رشته تحصيلي :
مهندسي مكانيك
تاريخ ويرايش اطلاعات :
1399/06/31
چكيده انگليسي :
Energy harvesting from a double cantilever beam with internal resonance Reza Eshtehardiha r eshtehardiha@me iut ac ir Data of Submission September 6 2020 Department of Mechanical Engineering Isfahan University of Technology Isfahan 84156 83111 IranDegree M Sc Language FarsiSupervisor Reza Tikani r tikani@cc iut ac ir AbstractConventional harvester systems usually have linear behavior One of the great matters in these systems is thatenergy is harvested in a low frequency bandwidth In this study double cantilever beams are used for energyharvesting Two beams are connected at the end of them through a linear spring The bimorph piezoelectricpatches are attached to the top beam using double sided tape for energy harvesting A pair of the magnet isapplied for adding a nonlinear effect to the system One of the magnets is mounted at the end of the bottombeam and another is on the system s base The whole system is designed based on the internal resonancephenomenon Base excitation of the acceleration type is used for exciting system The governing equationsof the system s vibration are derived using the energy method by the Euler Bernoulli assumptions Next thesystem is discretized by the assumed modes approach Two cases are investigated including the absence and thepresence of the magnetic force In the absence of the magnetic force the magnet mounted on the system s baseis removed and thus the system shows a linear behavior In the presence of the magnetic force the nonlinearityand internal resonance effects on the energy harvesting are investigated The obtained equations of motion aresolved with numerical and method of multiple scales MMS solutions For the first time in this study MMS isderived based on new scaling for a two degrees of freedom system with quadratic and cubic nonlinear terms MMS solution based on our proposed scaling is more accurate than the MMS solution based on conventionalscaling that others have used It predicts the frequency response peaks and their corresponding frequencies moreprecisely compared to the numerical solution A test rig was designed and fabricated for experimental studies The experimental results show that the performed modeling is in good agreement with the experimental data The obtained results show that in the presence of the magnetic force energy is usually harvested in a broaderfrequency bandwidth in comparison to the absence of magnetic force However its peak voltage can be higheror lower than the absence of the magnetic force Depending on need the system s parameters in the case of thepresence of magnetic force can be selected in such a way that the bandwidth or peak voltage or both increasecompared to the absence of magnetic force Keywordsenergy harvesting double cantilever beams nonlinear vibration internal resonance assume mode method ofmultiple scale
استاد مشاور :
سعيد ضيايي راد
استاد داور :
حسن نحوي، علي لقماني
