نویسنده
دانشکده مهندسی مکانیک، دانشگاه صنعتی شاهرود
چکیده
کار حاضر به بررسی عملکرد جاذب‌های ارتعاشی دینامیکی خطی و غیرخطی، برروی تیر اولر- برنولی با تکیه‌گاه‌های ساده، در معرض بارهای درحال حرکت می‌پردازد. جاذب‌های مورد استفاده متشکل از یک جرم، دو فنر و یک میراگر خطی هستند، که هریک از فنرها می‌توانند خطی و یا غیرخطی باشند. هدف از این کار، بررسی عملکرد این نوع جاذب‌ها نسبت به جاذب‌های دینامیکی کلاسیک و غیرخطی است. معادلات دیفرانسیل جزئی حاکم بر مسأله، با استفاده از روش گلرکین- بوبنو، به معادلات دیفراسیل معمولی تبدیل می‌شوند. عملکرد جاذب‌های دینامیکی در کاهش ارتعاشات تیر، از روش ماکزیمم دامنه ارتعاشی و سهم انرژی اتلافی توسط میراگر تخمین زده می‌شوند. در نهایت با بهینه‌سازی که صورت پذیرفت، اثربخشی این جاذب‌ها برای شرایط و موارد مختلف تعیین شدند.
کلیدواژه‌ها
عنوان مقاله [English]
On the Performance of Linear and Nonlinear Dynamic Absorbers for Beams Subjected to Moving Loads
نویسنده [English]
- H. Lakzian
چکیده [English]
The present work studies the performance of linear and nonlinear dynamic vibration absorbers mounted on Euler–Bernoulli beams subjected to moving loads. Absorbers used in this work consist of one mass, two springs and one linear damper.The springs may be considered either linear or non-linear. The objective is to compare the performance of these absorbers with classical dynamic and nonlinear absorbers. The partial differential equations governing the problem are reduced to a set of ordinary differential equations by means of Galerkin–Bubnov method. The performance of the dynamic absorbers in reduction of the beams’ vibration is estimated through the maximum amplitude of vibration and the portion of energy dissipated by the dynamic damper. Finally, after optimizations, the effectiveness of the dynamic absorbers is determined for different conditions and applications.
کلیدواژه‌ها [English]
- Moving loads
- Linear and nonlinear dynamic absorber
- Euler–Bernoulli Beam
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