مهندسی ساخت و تولید ایران

مهندسی ساخت و تولید ایران

استفاده از تبدیل‌موجک و شکل‌مودهای ارتعاشی برای شناسایی عیب‌ترک در صفحه فولادی ساخت‌افزایشی

نوع مقاله : مقاله پژوهشی

نویسندگان
مجتمع دانشگاهی مواد و فناوری های ساخت، دانشگاه صنعتی مالک اشتر، تهران، ایران
10.22034/ijme.2025.532775.2101
چکیده
ترک در قطعات ساخت‌افزایشی مانند ذوب انتخابی لیزری از جمله عیوب متداول در این قطعات است. تست مودال یکی از روش‌های غیرمخرب برای عیب‌یابی این نوع قطعات است. دو عامل کوچک‌بودن اندازه ترک و ابعاد کوچک قطعات ساخته شده با این روش، باعث چالش‌هایی مانند چالش تحریک فرکانس بالای قطعه می‌شود. در مقاله حاضر نشان داده شده که روش‌های عیب‌یابی مودال به‌تنهایی قادر به شناسایی این عیوب کوچک نیستند. درحالی‌که با روش ترکیبی تبدیل‌موجک و شکل‌مود ترک‌هایی با عمق کوچک نیز قابل شناسایی هستند. در این تحقیق ترک‌هایی به صورت تعمدی با عمق‌های مختلف بر روی یک صفحه ساخت افزایشی ایجاد گردیده و از روش ترکیبی مذکور برای شناسایی عیب استفاده شده است. نتایج نشان داد، عیب‌یابی از طریق شکل‌مود باعث شناسایی ترک با شدت 30 درصد و ترکیب آن با تبدیل موجک باعث شناسایی ترک با شدت کمتر یعنی 10 درصد می‌گردد. مطابق نتایج حاصله روش ترکیبی تبدیل‌موجک قادر به شناسایی و مکان‌یابی ترک با شدت 10٪ در آنالیز‌ مودال عددی با خطای 4٪ و در آزمایش مودال تجربی با خطای 10٪ است. از دیگر نتایج این تحقیق این است که تحلیل مودال عددی این صفحه به صورت یک جسم صلب بدون اثر لایه‌ها، بدلیل ماهیت تولید و نوع پودر منطقی بوده و با تقریب خوبی نزدیک به نتایج آزمون مودال است. به‌طور خلاصه، این فعالیت تحقیقی نشان می‌دهد بکارگیری روش‌های عیب‌یابی ‌مودال در قطعات ساخت‌افزایشی، به‌عنوان یک روش بازرسی کاملاً کاربردی بوده و توسعه این روش‌ها برای اینگونه قطعات ضروری است.
کلیدواژه‌ها

عنوان مقاله English

Using wavelet transform and vibration mode shapes to identify crack defect in additively manufactured steel plate

نویسندگان English

Ali Reza Mirmohamadkhani
Reza Azarafza
Reza shoja razavi
Masood Barkat
Faculty of Materials and Manufacturing Technologies, Malek Ashtar University of Technology, Tehran, Iran
چکیده English

Cracks in additive manufacturing parts, such as those produced by laser selective melting, are common defects. Modal testing is a non-destructive method used to detect such defects. However, the small size of cracks and the limited dimensions of parts made by this technique present challenges, including difficulties in exciting high-frequency modes. This study demonstrates that modal-based diagnostic methods alone cannot effectively identify small cracks. In contrast, a combined approach using wavelet transform and mode shape analysis can detect cracks with small depths. In this research, cracks with varying depths were intentionally introduced on an additively manufactured plate, and the integrated method was applied for defect identification. Results showed that mode shape analysis alone could detect cracks with an intensity of 30%, while combining it with wavelet transform improved detection sensitivity to cracks with as low as 10% intensity. According to the findings, the combined wavelet transform method can detect and locate cracks with 10% intensity with an error margin of 4% in numerical modal analysis and 10% in experimental modal testing. Another result indicates that modeling the plate as a rigid body without considering layer effects is reasonable due to the production nature and powder type, yielding results close to experimental tests. In summary, this research highlights that utilizing modal diagnostic methods for additive manufacturing parts is a practical inspection approach, and further development of these methods is essential for such components.

کلیدواژه‌ها English

Additive Manufacturing
Selective Laser Melting
Modal Defect Detection
Vibration Mode Shapes
Wavelet Transform
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