عیب‌یابی تجربی و عددی محل عیب راه به در صفحات همگن به روش توموگرافی امواج ورقی

نوع مقاله: مقالة‌ تحقیقی‌ (پژوهشی‌)

نویسندگان

1 دانشکده مهندسی مکانیک، پردیس دانشکده‌های فنی دانشگاه تهران

2 پژوهشگاه فضایی ایران

چکیده

استفاده از امواج هدایت شده ورقی، یکی از قابل اطمینان‌ترین روش‌های پایش سلامت است. اغلب به منظور شناسایی عیوب داخلی از امواج حجمی استفاده می‌گردد که در تشخیص موقعیت ترک‌های سطحی ناکارآمد است. در این مقاله، فرآیند استفاده از روش توموگرافی امواج ورقی جهت تشخیص ترک در یک ورق آلومینیومی بررسی گردیده و برای سه ترک با طول‌های 4، 7 و 10 میلی‌متر پیاده‌سازی شده است. روابط تحلیلی و شبیه‌سازی‌های عددی جهت استخراج منحنی دیسپرژن به عنوان ابزاری جهت انتخاب ضخامت ورق و مشخصات پیزوالکتریک، مورد استفاده قرار گرفته است. تعیین چیدمان قرارگیری تراگذرها و ایجاد مدل‌های عددی و تجربی، گام‌های بعدی در فرآیند بازرسی است. سپس تمام پیزوالکتریک‌ها به ترتیب تحریک شده‌اند و سایز تراگذرها به عنوان حسگر مورد استفاده قرار گرفته‌اند و سیگنال خروجی آن‌ها در هر دو حالت سالم و معیوب در مدل‌های عددی و تجربی ذخیره گردیده است. تعیین معیار اختلاف سیگنال‌ها، بازسازی سیگنال‌ها و ایجاد توموگرام، مراحل نهایی فرآیند ارائه شده در این مقاله می‌باشند.

کلیدواژه‌ها


عنوان مقاله [English]

Numerical and Experimental Location Detection of Through Defect in Homogenized Plates using Tomography of Surface Wave Method

نویسندگان [English]

  • Saeed Zohoori 1
  • saeed shakhesi 2
1 Faculty of Mechanical Engineering, College of Engieering, University of Tehran
2 Iranian Space Research Center
چکیده [English]

Using surface guided wave is one of the most reliable methods of structural health monitoring. Mostly the bulk wave is preferred for identification of internal defects, which is inefficient in localizing the surface cracks. In this research the procedure of ultrasonic surface wave tomography for crack detection in an aluminum plate is investigated and applied for three cracks with the length of 4, 7 and 10 millimeters. Analytical equations and numerical simulations are used to extract dispersion curves as a means for selection of plate thickness and piezoelectric characteristics. The Layout selection for transducers and providing numerical and experimental models are the next steps of inspection procedure. All the piezoelectric discs are actuated respectively. Meanwhile, other piezoelectric elements are used as sensors and their received signal is stored in both healthy and defected structures for both numerical and experimental models. Definition of signal difference criteria, signal reconstruction and tomogram generation are the last steps of the procedure presented in this paper.

کلیدواژه‌ها [English]

  • Tomography
  • Guided wave
  • fault detection
  • surface wave
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