عیب‌یابی ورق با استفاده از روش تبدیل کانتورلت بر پایه‌ی موجک

رستمی, سبحان; مشهدی, جواد; حا جی زاده, علیرضا

doi:10.22065/jsce.2023.364324.2956

عیب‌یابی ورق با استفاده از روش تبدیل کانتورلت بر پایه‌ی موجک

نوع مقاله : علمی - پژوهشی

نویسندگان

¹ استادیار، گروه مهندسی عمران، دانشگاه فنی و حرفه ای، تهران، ایران

² استادیار، گروه مهندسی عمران، دانشگاه فنی و حرفه ای تهران، ایران.

10.22065/jsce.2023.364324.2956

چکیده

هدف از این مطالعه ارائه‌ی یک رویکرد جدید در عیب‌یابی ورق‌ها از تبدیل کانتورلت، بنام تبدیل کانتورلت بر پایه‌ی موجک می‌باشد. این تبدیل به عنوان یک تبدیل دو بعدی جدید و توسعه یافته از تبدیل موجک، برای مقابله با محدودیت‌های ذاتی موجک‌ها ارائه ‌شده است. تبدیل کانتورلت بر پایه‌ی موجک، یک خانواده‌ی جدید دیگر از تبدیل‌های کانتورلت با همان خصوصیت دو مرحله‌ای از بانک‌های فیلتر و تجزیه‌ی شعاعی و زاویه‌ای معرفی ‌شده‌اند. که در این مطالعه از این روش برای اولین بار در عیب‌یابی ورق استفاده شده است. در گام اول با استفاده از تبدیل موجک، ورق به چهار زیر تصویر تجزیه می‌شود. سپس با استفاده از بانک‌های فیلتر جهت‌دار، یک تجزیه‌ی شعاعی ۸ جهته در هر زیر تصویر از تصویر اولیه، به خوبی ارائه می‌شود. برتری این روش نسبت به تبدیل موجک، تجزیه‌ی شعاعی در جهت‌های مختلف با استفاده از بانک فیلتر جهت‌دار می‌باشد. این برتری در تصاویر با خطوط منحنی شکل قابل تشخیص است. در این روش عیب در ورق با تغییر در مدول الاستیسیته نمایش داده می‌شود. سپس با استفاده از تحلیل فرکانسی سازه، مد شکل‌ اول برای سازه سالم و سازه خراب به ‌عنوان پاسخ سازه به دست می‌آید. با اعمال تبدیل پیشنهادی بر روی پاسخ‌های سازه محل، شکل و اندازه تقریبی از عیب ورق مشخص می‌شود.

کلیدواژه‌ها

موضوعات

مهندسی سازه و زلزله

عنوان مقاله [English]

Damage detection of plate using the wavelet-based contourlet transform method

نویسندگان [English]

Sobhan Rostami ¹
Javad Mashhadi ²
Alireza Hajizadeh ¹

¹ Assistant Professor, Dept. of Civil Engineering, Technical and Vocational University (TVU), Tehran, Iran

² Assistant Professor, Dept. of Civil Engineering, Technical and Vocational University (TVU), Tehran, Iran

چکیده [English]

The purpose of this study is to present a new method of plate damage detection using the wavelet-based contourlet transform method. The contourlet transforms developed based on the Wavelet transform is a new two-dimensional transform that overcomes the limitations of the wavelet transform. The wavelet-based contourlet transform is a new family of contourlet transforms with the same two-step characteristic introduced from the same filter banks, radial, and angular decomposition. This method is used in plate damage detection for the first time. In the first step, the plate using the wavelet transform is decomposed into four sub-bands. Then, a radius decomposition with eight bands in each sub-band of the initial image is introduced using one of the directional filter banks. The radius decomposition in different directions is known as the advantage of this method in comparison with the wavelet transform. This advantage is observed in images with curved lines. In this method, the change in the elastic modulus is considered as damage in plates. The fundamental mode shape of intact and damaged plates is first obtained from the structural frequency analysis. Then, the location, shape, and approximate size of damage are obtained by applying this transform to the responses of the structure.

کلیدواژه‌ها [English]

Damage detection
plate
wavelet-based contourlet transform
mode shape
elastic modulus

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