کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
11012596 1798496 2019 10 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Experimental study of mode shifting in an asymmetrically heated rectangular plate
ترجمه فارسی عنوان
مطالعه تجربی حالت تغییر در صفحات مستطیلی گرم نشده نامتقارن
کلمات کلیدی
درجه حرارت بالا، تغییر حالت، پریدن حالت، همبستگی تصویر دیجیتال، لرزش حرارتی، صفحات
موضوعات مرتبط
مهندسی و علوم پایه سایر رشته های مهندسی مهندسی عمران و سازه
چکیده انگلیسی
Modal shifting and jumping in thermally buckled plates has been investigated previously using computational models; however, relatively few experimental explorations have been reported. In this study, the modal shifts and jumps in a simple rectangular plate or panel were investigated using digital image correlation to obtain detailed mode shapes. One face of the planar panel, which was 219 × 146 mm, was speckled and viewed with a stereoscopic digital image correlation system using pulsed-laser illumination and with a laser vibrometer at a single point. The other face was heated using a set of 1 kW quartz lamps to produce a non-uniform temperature distribution which progressively increased from room temperature to around 760 K. An infra-red camera recorded the time-varying temperature distribution on the panel while it was excited with an electrodynamic shaker. A waterfall plot, or time-frequency spectrogram, showing natural frequencies as a function of time was generated, which highlighted the shifting response of the panel with temperature. The heating sequence was repeated and the panel excited at the natural frequencies identified in the waterfall plot, which permitted the corresponding mode shapes to be measured. These data showed that mode shifting and jumping was present with asymmetric heating, but not with spatially uniform heating, and was associated with thermally-induced buckling.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Sound and Vibration - Volume 439, 20 January 2019, Pages 241-250
نویسندگان
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