کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
4922477 | 1430187 | 2017 | 59 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Shape optimization of phononic band gap structures using the homogenization approach
ترجمه فارسی عنوان
بهینه سازی شکل ساختارهای شکاف فونونی با استفاده از رویکرد همگن سازی
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کلمات کلیدی
مواد فونیکس، امواج صوتی، ساختار باند شکاف، بهینه سازی، تجزیه و تحلیل میزان حساسیت، یکسان سازی،
موضوعات مرتبط
مهندسی و علوم پایه
سایر رشته های مهندسی
مهندسی عمران و سازه
چکیده انگلیسی
The paper deals with optimization of the acoustic band gaps computed using the homogenized model of strongly heterogeneous elastic composite which is constituted by soft inclusions periodically distributed in stiff elastic matrix. We employ the homogenized model of such medium to compute intervals - band gaps - of the incident wave frequencies for which acoustic waves cannot propagate. It was demonstrated that the band gaps distribution can be influenced by changing the shape of inclusions. Therefore, we deal with the shape optimization problem to maximize low-frequency band gaps; their bounds are determined by analysing the effective mass tensor of the homogenized medium. Analytic transformation formulas are derived which describe dispersion effects of resizing the inclusions. The core of the problem lies in sensitivity of the eigenvalue problem associated with the microstructure. Computational sensitivity analysis is developed, which allows for efficient usage of the gradient based optimization methods. Numerical examples with 2D structures are reported to illustrate the effects of optimization with stiffness constraint. This study is aimed to develop modelling tools which can be used in optimal design of new acoustic devices for “smart systems”.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: International Journal of Solids and Structures - Volumes 113â114, 15 May 2017, Pages 147-168
Journal: International Journal of Solids and Structures - Volumes 113â114, 15 May 2017, Pages 147-168
نویسندگان
Jaroslav VondÅejc, Eduard Rohan, Jan Heczko,