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دوره 19، شماره 40 - ( 8-1402 )
جلد 19 شماره 40 صفحات 42-30 |
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Asil Gharebaghi S, Shirzad M. Numerical study of the dynamic behavior of cylinders with nonlinear support exposed to flow. Marine Engineering 2023; 19 (40) :30-42
URL: http://marine-eng.ir/article-1-1050-fa.html
URL: http://marine-eng.ir/article-1-1050-fa.html
اصیل قره باغی سعید، شیرزاد محمد. مطالعه عددی رفتار دینامیکی استوانه‌های در معرض جریان با تکیه‌گاه غیرخطی. مهندسی دریا. 1402; 19 (40) :30-42
1- دانشکده عمران، دانشگاه صنعتی خواجه نصیرالدین طوسی
چکیده: (812 مشاهده)
ارتعاشات ناشی از گردابه ممکن است موجب بروز رفتار آشوبناک در سازه‌های فراساحلی شود. رفتار آشوبناک با ایجاد خستگی عمر این سازه‌ها را کاهش می‌دهد. در این پژوهش با فرض یک تکیه‌گاه غیرخطی، رفتار دینامیکی این سازه‌ها مورد بررسی قرار گرفته است. با استفاده از انواع مختلف فنرها میزان غیرخطی بودن تکیه‌گاه تغییر داده شده است. با حل هم‌زمان معادلات دوبعدی میانگین رینولدز ناویر-استوکس و معادله حرکت استوانه، سیگنال جابه‌جایی استوانه و نیروی برآیی به دست آمده است. سپس آزمون های تشخیص آشوب بر روی سیگنال‌ها اعمال گردیده است. نتایج نشان می‌دهد که رفتار سیستم از دو شاخه تشکیل می شود. دامنه شاخه دوم چند برابر دامنه شاخه اول است. در نقطه آغاز شاخه دوم رفتار استوانه و نیروی برآیی آشوبناک است. هرچه میزان غیرخطی بودن تکیه‌گاه افزایش یابد طول شاخه دوم کاهش پیدا می‌کند اما درجه رفتار آشوبناک استوانه و نیروی برآیی افزایش می‌یابد.
فهرست منابع
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