نویسنده
دانشکده مهندسی مکانیک، دانشگاه تبریز، تبریز
چکیده
یکی از روشهای جدید برای تأمین انرژی سیستم‌های الکتریکی کم مصرف مورد استفاده در دریا، استفاده از انرژی مکانیکی امواج است. در این روش با استفاده از مبدل پیزوالکتریک، انرژی ناشی از امواج دریا به الکتریسیته تبدیل می‌شود. مزیت این روش عدم نیاز به تعویض یا شارژ باتری سیستم مورد نظر است. در تحقیقات پیشین، مطالعاتی در زمینه برداشت انرژی از امواج دریا انجام شده ولی تحقیقی کامل در زمینه برداشت انرژی با درنظر گرفتن مدل موج تصادفی جانسواپ انجام نشده است. مدل موج تصادفی جانسواپ تقریب بهتری برای شبیه‌سازی امواج دریا نسبت به مدل موج منظم ایری است. به‌همین منظور در این مقاله یک تیر قائم متصل به کف دریا که مجهز به وصله‌های پیزوالکتریک است، به‌عنوان برداشت کننده انرژی درنظر گرفته شده و بعد از مدل‌سازی با استفاده از نرم‌افزار متلب شبیه‌سازی می‌شود. در ادامه با درنظر گرفتن مدل موج نامنظم جانسواپ پاسخ ارتعاشی تیر و به تبع آن توان تولیدی محاسبه شده و قابلیت اطمینان سیستم و تأثیر مقدار نامعینی‌های وصله‌های پیزوالکتریک روی توان تولیدی به‌صورت آماری بررسی می‌شود. درنهایت احتمال خرابی برداشت کننده انرژی بر پایه تعریف مناسبی از معیار تخطی مطالعه شده است.
کلیدواژه‌ها
عنوان مقاله [English]
Reliability Study of Energy Harvesting from Sea Waves by Piezoelectric Patches Consideraing Random JONSWAP Wave Theory
نویسنده [English]
- M. Ettefagh
چکیده [English]
One of the new methods for powering low-power electronic devices employed in the sea, is using of mechanical energies of sea waves. In this method, piezoelectric material is employed to convert the mechanical energy of sea waves into electrical energy. The advantage of this method is based on not implementing the battery charging system. Although, many studies have been done about energy harvesting from sea waves, energy harvesting with considering random JONWSAP wave theory is not fully studied up to now. The random JONSWAP wave model is a more realistic approximation of sea waves in comparison of Airy wave model. Therefore, in this paper a vertical beam with the piezoelectric patches, which is fixed to the seabed, is considered as energy harvester system. The energy harvesting system is simulated by MATLAB software, and then the vibration response of the beam and consequently the generated power is obtained considering the JONWSAP wave theory. In addition, the reliability of the system and the effect of piezoelectric patches uncertainties on the generated power are studied by statistical method. Furthermore, the failure possibility of harvester based on violation criteria is investigated.
کلیدواژه‌ها [English]
- energy harvesting
- Piezoelectric
- Random JONSWAP wave theory
- Reliability
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