مهندسی مکانیک مدرس

مهندسی مکانیک مدرس

شناسایی رفتار غیرخطی تماسی مبتنی بر تکنیک تلفیق ارتعاشات و آکوستیک برخط

نوع مقاله : پژوهشی اصیل

نویسندگان
ناصرالدین سپهری 1
محمد احسانی 2
مهناز شمشیرساز 2
مجتبی صدیقی 3
1 دانشکده مهندسی مکانیک و مکاترونیک، دانشگاه صنعتی شاهرود، شاهرود، ایران
2 پژوهشکده فناوری نو، دانشگاه‌ صنعتی امیرکبیر (پلی‌تکنیک تهران)، تهران، ایران
3 دانشکده مهندسی مکانیک، دانشگاه‌ صنعتی امیرکبیر (پلی‌تکنیک تهران)، تهران، ایران
چکیده
به‌کارگیری مشخصه‌های دینامیکی غیرخطی سازه تحت پایش به‌منظور شناسایی زودهنگام آسیب، ازجمله ایده‌های جدید در حوزه پایش سلامت مبتنی بر وصله‌های پیزوالکتریک به‌شمار می‌رود. شل‌شدن تکیه‌گاه گیردار ازجمله عیوبی است که نه‌تنها منجر به ایجاد اخلال در سیستم‌های مهندسی مختلف می‌شود، بلکه اغلب با تاثیرگذاری بر روی سیگنال‌های حسگری، شناسایی آسیب در سازه را با چالش مواجه می‌کند. در این پژوهش رفتار غیرخطی تماسی ناشی از شل‌شدن تکیه‌گاه گیردار به‌کمک تکنیک تلفیق ارتعاشات و آکوستیک مورد پایش قرار گرفت. استفاده از وصله‌های پیزوالکتریک با قابلیت اتصال دائم به سازه میزبان به‌منظور تحریک سیگنال‌های پمپ و حامل و همچنین ثبت سیگنال تلفیق‌شده، امکان پایش برخط مبتنی بر تکنیک تلفیق را فراهم آورد. اعمال یک فیلتر مناسب منجر به حذف فرکانس‌های طبیعی و ظهور باندهای جانبی تلفیق در اطراف فرکانس تحریک مرکزی شد. در این پژوهش همچنین حساسیت تلفیق به فرکانس تحریک سیگنال پمپ مورد بررسی قرار گرفت. طبق نتایج، بروز باندهای تلفیق جانبی در اطراف باند فرکانس مرکزی، شاخص مناسبی برای تشخیص رفتار غیرخطی ناشی از شل‌شدن تکیه‌گاه محسوب می‌شود. در ادامه از یک مدل المان محدود وابسته الکترومکانیکی به‌منظور بررسی مکانیزم دقیق ایجاد پدیده تلفیق استفاده شد. تطابق مناسب نتایج عددی و آزمایشگاهی، نشان از دقت کافی مدل عددی توسعه داده‌شده و قابلیت آن در پیش‌بینی پدیده تلفیق دارد.
کلیدواژه‌ها
پایش سلامت سازه
تلفیق ارتعاشات و آکوستیک
غیرخطی تماسی آکوستیک
وصله‌های پیزوالکتریک
مدل المان محدود وابسته الکترومکانیکی
نتایج تجربی

موضوعات

عنوان مقاله English

Contact Acoustic Nonlinearity Identification via Online Vibro-Acoustic Modulation Technique

نویسندگان English

N. Sepehry 1
M. Ehsani 2
M. Shamshirsaz 2
M. Sadighi 3
1 Mechanical & Mechatronic Engineering Faculty, Shahrood University of Technology, Shahrood, Iran
2 New Technologies Research Center (NTRC), Amirkabir University of Technology (Tehran Polytechnic), Tehran, Iran
3 Mechanical Engineering Faculty, Amirkabir University of Technology (Tehran Polytechnic), Tehran, Iran
چکیده English

Employing nonlinear dynamic signature of the host structure for early damage detection and remaining useful life estimation purposes, is an emerging idea in the area of piezoelectric patches based structural health monitoring. Clamped support loosening is one of the defects that not only may cause disorder in system’s functioning, but also obstruct damage identification process through distorting the signals. In this study, support loosening induced contact acoustic nonlinearity (CAN) behavior was monitored by vibro-acoustic modulation (VAM) technique. Using miniaturized PZT patches with the capability to be installed on the host structure permanently for both pump and probe actuation as well as sensing the modulated signal, enabled online monitoring via VAM technique. An appropriate filter was designed to eliminate the unintentionally excited natural frequencies and to reveal the sidebands. In this study, the sensitivity of modulation strength to the pump excitation frequency was also investigated. According to the results, appearance of sidebands around the central probe frequency is an appropriate indicator for CAN identification. In order to study the mechanism of modulation phenomenon, a coupled field electromechanical finite element (FE) model was developed. Proper matching of the numerical and experimental results indicates sufficient accuracy of the developed FE model and its potential to predict the modulation behavior.

کلیدواژه‌ها English

Structural health monitoring
Vibro-Acoustic Modulation
Contact Acoustic Nonlinearity
Piezoelectric Patches
Coupled Field Finite
Element Analysis
Experimental results
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مهندسی مکانیک مدرس
دوره 20، شماره 7
تیر 1399
صفحه 1719-1730