نویسندگان
گروه مهندسی مکانیک، واحد تبریز، دانشگاه آزاد اسلامی، تبریز
چکیده
یکی از روشهای جدید برای تأمین انرژی سیستم‌های الکتریکی کم مصرف، استفاده از انرژی مکانیکی ارتعاشات سازه‌ها است. در این روش با استفاده از مبدل پیزوالکتریک، انرژی ناشی از ارتعاشات به الکتریسته تبدیل می‌شود. مزیت این روش عدم نیاز به تعویض یا شارژ باتری وسیله الکتریکی است. در این مقاله به بررسی برداشت انرژی توسط یک تیر یکسر گیردار ساخته شده از جنس مواد هدفمند با لایه پیزوالکتریک پرداخته شده است. مدل‌سازی ریاضی سیستم ارائه شده و معادلات کوپل دینامیکی ارتعاش سیستم و ولتاژ تولید شده توسط پیزو الکتریک‌ها استخراج می‌شود و سپس تأثیر پارامترهای برادشت‌کننده روی توان تولیدی مطالعه می‌شود. با توجه به‌وجود نامعینی در پارامترهای سیستم برداشت‌کننده انرژی، برای اولین بار تأثیر نامعینی‌ها روی مقدار انرژی تولیدشده به‌صورت آماری با استفاده از روش مونت- کارلو بررسی می‌شوند. نتایج حاکی از این است هرچند میزان توان قابل استحصال در فرکانس طبیعی اول به‌مراتب بیشتر از سایر فرکانس‌ها است ولی در حوالی فرکانس طبیعی اول تأثیر نامعینی در سیستم افزایش پیدا کرده و قابلیت اطمینان برداشت‌کننده کاهش پیدا می‌کند.
کلیدواژه‌ها
عنوان مقاله [English]
Statistical Analysis of Energy Harvesting From Functionally Graded Cantilever Beam with Piezoelectric Layer
نویسندگان [English]
- A. Panjebashi Naghsh
- K. K. Esmaeili. Torkanpouri
چکیده [English]
One of the new methods for powering low power electronic devices is the use of mechanical energies due to vibrations. In this method, the piezoelectric material is employed for converting the mechanical energy of vibration into the electrical energy. The advantage of this method is needlessness of using the battery charging system. In this paper, the functionally graded (FG) cantilever with the piezoelectric layer is considered as energy harvester system. The mathematical model of the system is constructed and the governing equation for electromechanical coupling is presented. Then the effects of the system parameters on the generated power is studied. Finally, by considering uncertainties in energy harvester parameters, the effect of uncertainties on the produced energy is investigated by Monte-Carlo simulation method for the first time. The results show that although the amount of generated power in the first natural frequency is higher than the other frequencies, but around the first natural frequency, the effect of uncertainties is increased and thus, the reliability of the energy harvester will be decreased.
کلیدواژه‌ها [English]
- energy harvesting
- Functionally Graded
- Uncertainties Analysis
- Monte-Carlo Simulation
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