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کشف آسیبهای صفحات با استفاده از تبدیل موجک گسسته دادههای مودال بازسازیشده | ||
| نشریه مهندسی عمران امیرکبیر | ||
| مقاله 10، دوره 51، شماره 3، مرداد و شهریور 1398، صفحه 503-522 اصل مقاله (14.64 M) | ||
| نوع مقاله: مقاله پژوهشی | ||
| شناسه دیجیتال (DOI): 10.22060/ceej.2018.13723.5465 | ||
| نویسندگان | ||
| میلاد پایسته1؛ مرتضی آقاجان نشتایی2؛ محمد طاهری نسب* 3؛ سیدبهرام بهشتی اول4 | ||
| 1کارشناس ارشد عمران، مهندسی رودخانه، دانشگاه صنعتی جندی شاپور، دزفول، ایران | ||
| 2دانشگاه شهید بهشتی | ||
| 3هیئت علمی دانشکده عمران، دانشگاه صنعتی جندی شاپور دزفول | ||
| 4عضو هیات علمی رسمی قطعی | ||
| چکیده | ||
| تکینگی های موضعی بر اثر تغییر در سختی یا جرم ناحیه آسیب دیده به راحتی در نتایج آنالیز مودال قابل تشخیص نیستند. تبدیل موجک با تشخیص آنی تغییرات مکانی سیگنال ورودی، محل آسیب های سازه را تشخیص می دهد. هدف این پژوهش ارائه روشی جهت شناسایی آسیب در صفحات می باشد. لذا در یک مطالعه موردی صفحه ای مربعی با شرایط مرزی متقارن و دارای تکیه گاه گیردار مدل سازی می شود. روش ارائه شده در این پژوهش قادر به کشف عیوب موجود در صفحات با نسبت آسیب 3 %می باشد. در این روش حسب متقارن و یا پادمتقارن بودن ماتریس خیز، هر نقطه از نتایج آنالیز مودال صفحه با نقطه متقارن نسبت به مرکز صفحه، جمع )در حالت پادمتقارن( و یا از آن کم می شود )در حالت متقارن(. نتایج نشان می دهد ضرایب موجک آنالیز مودال بازسازی شده در مقایسه با ضرایب موجک آنالیز مودال اصلی، آسیب های ریز را با وضوح باالیی نمایش می دهد. به عالوه نتایج نشان می دهد که به منظور کاهش هزینه های مالی پروژه می توان از تعداد نقاط نمونه برداری کمتری استفاده کرد مشروط بر آن که درونیابی بین نقاط به کار گرفته شود. | ||
| کلیدواژهها | ||
| کشف عیوب؛ تبدیل موجک گسسته؛ آنالیز مودال؛ سازه های صفحه ای؛ پایش سازه | ||
| عنوان مقاله [English] | ||
| Detection of Damage in Simply-Supported Plates by Discrete Wavelet Transform of Reconstructed Modal Data | ||
| نویسندگان [English] | ||
| Milad Payesteh1؛ Morteza Aghajan Nashtaee2؛ mohammad taheri nasab3؛ Seyed bahram Beheshti Aval4 | ||
| 1Msc graduated in Civil Engineering, Jundi-Shapur University of Technology, Dezful, Iran | ||
| 2Shahid Beheshti University | ||
| 3Faculty of Civil Engineering, Jondi Shapur University of Technology, Dezful, Iran | ||
| 4faculty member of shahid beheshti university of tehran iran | ||
| چکیده [English] | ||
| Localized singularities caused by changes in the stiffness or mass of the damaged region cannot be simply visible through modal analysis results. However, the wavelet transform of input signal can identify the location of defects by sudden changes in the spatial variation of transformed response. The aim of this research is to present a new method for damage detection in a damaged plate. Therefore, a squarely steel plate with fixed support conditions is modeled, symmetrically. The proposed method in this study is capable to detect existing defects in plates with damage ratio of 3%. In this approach, based on symmetry or asymmetry of mode shapes, the value of each point of mode shape data is respectively subtracted from or added with its symmetric point. The results demonstrat that the small defects are detected with high resolution by employing reconstructed modal data in contrast to the original mode shape data. In addition, it has been shown that less-detailed measurement can still be used provided an interpolation is used to improve the accuracy of the crack detection and decrease financial cost of structural health monitoring projects. | ||
| کلیدواژهها [English] | ||
| Damage detection, Discrete wavelet transforms, Modal data, Plates, Health monitoring | ||
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