کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
4924367 | 1430841 | 2017 | 16 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Subwavelength elastic joints connecting torsional waveguides to maximize the power transmission coefficient
ترجمه فارسی عنوان
مفاصل کششی نیمه طولی که موجبرهای پیچشی را متصل می کنند برای به حداکثر رساندن ضریب انتقال قدرت
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کلمات کلیدی
شکل مشترک مطلوب، مفصل طولی عرضی، بهینه سازی شکل، شکل خرچنگ شکل، ضریب انتقال نیرو،
موضوعات مرتبط
مهندسی و علوم پایه
سایر رشته های مهندسی
مهندسی عمران و سازه
چکیده انگلیسی
Joints with slowly varying tapered shapes, such as linear or exponential profiles, are known to transmit incident wave power efficiently between two waveguides with dissimilar impedances. This statement is valid only when the considered joint length is longer than the wavelengths of the incident waves. When the joint length is shorter than the wavelengths, however, appropriate shapes of such subwavelength joints for efficient power transmission have not been explored much. In this work, considering one-dimensional torsional wave motion in a cylindrical elastic waveguide system, optimal shapes or radial profiles of a subwavelength joint maximizing the power transmission coefficient are designed by a gradient-based optimization formulation. The joint is divided into a number of thin disk elements using the transfer matrix approach and optimal radii of the disks are determined by iterative shape optimization processes for several single or bands of wavenumbers. Due to the subwavelength constraint, the optimized joint profiles were found to be considerably different from the slowly varying tapered shapes. Specifically, for bands of wavenumbers, peculiar gourd-like shapes were obtained as optimal shapes to maximize the power transmission coefficient. Numerical results from the proposed optimization formulation were also experimentally realized to verify the validity of the present designs.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Sound and Vibration - Volume 392, 31 March 2017, Pages 154-169
Journal: Journal of Sound and Vibration - Volume 392, 31 March 2017, Pages 154-169
نویسندگان
Joong Seok Lee, Il Kyu Lee, Hong Min Seung, Jun Kyu Lee, Yoon Young Kim,