Investigating the Effects of Aerodynamic Force Model on the Response of a Galloping PZT Energy Harvester

سال انتشار: 1398
محل انتشار: کنفرانس دو سالانه بین المللی مکانیک جامدات تجربی
کد COI اختصاصی: WMECH05_092
زبان مقاله: انگلیسی
تعداد مشاهده: 524

نویسندگان

Ph.D. Student Mechanical Engineering Faculty, Iran University of Science and Technology, Narmak, Tehran, Iran

Associate Professor Mechanical Engineering Faculty, Iran University of Science and Technology, Narmak, Tehran, Iran.

چکیده

This paper studies the effects of higher order terms in aerodynamic force model on the mechanical and electrical responses of a galloping-based piezoelectric energy harvesters. The system composed of a piezoelectric bimorph cantilever beam with an attached bluff body and exposed to an incoming flow. The aerodynamic force is modelled based on the quasi-steady assumption. First, utilizing an experimentally validated parameters, the dimensionless aero-electromechanical governing equations of the system is provided for the cases of 3rd and 7th order aerodynamic model. Then, using a numerical integration method, the differences between the responses originating from the 3rd and 7th order aerodynamic force scenarios are studied. It is observed that the responses corresponding to the aforementioned models have a considerable difference, especially in the higher flow speeds. Then, an approximate-analytical solution based on the multiple the scales method (MSM) is obtained; the numerical observations are also verified by the MSM solutions. The results disclose that considering the higher order terms in the aerodynamic force expansion is necessary for the accurate characterization of the mechanical and electrical response of the system.

کلیدواژه ها

Galloping energy harvesting, PZT materials, Nonlinear vibrations, Multiple scales method

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