Ortadan mesnetli mikro kirişin doğrusal titreşim hareketleri
Year 2021,
Volume: 36 Issue: 2, 1089 - 1104, 05.03.2021
Şevki Akkoca
,
Süleyman Murat Bağdatlı
,
Necla Toğun
Abstract
İmalat teknolojisindeki gelişmeler neticesinde ortaya çıkan mikro ve nano elektromekanik sistemler (MEMS ve NEMS); biyosensörler, aktüatörler ve atomik kuvvet mikroskopları (AKM) gibi mikro ve nano yapıya sahip sistemlerde çok yaygın olarak kullanılmaktadır. NEMS ve MEMS’ de kiriş veya benzeri elemanlar ve yapılar bulunmaktadır. Bu elemanlar sabit kesitli olduğu gibi değişken kesitlere de sahip olabilmektedirler. Söz konusu sistemler içindeki kiriş elemanların statik ve dinamik davranış karakterlerinin bilinmesi çok önemlidir. Çünkü sistemin sorunsuz çalışması için ihtiyaç duyulan çalışma frekansının, tasarlanan sistemin doğal frekansı ile aynı olmaması gerekmektedir. Bu nedenden dolayı mikro ve nano elemanların serbest titreşim analizlerinin yapılması sorunsuz bir tasarım için hayati önem taşımaktadır. Bu kapsamda, ortadan mesnetli mikro kirişin titreşim analizleri yapılmıştır. Mikro kiriş seramik özellikte olup elektrik alan içerisine yerleştirilmiş ve mesnetlerin pozisyonları değiştirilerek titreşim karakterleri incelenmiştir. Hareket denklemleri modifiye gerilme çifti teorisi kullanılarak Hamilton metoduna göre elde edilmiştir. Hareket denklemi, pertürbasyon metotlarından biri olan çok zaman ölçekli metot ile çözümü elde edilmiştir. Doğal frekanslar ve mod şekilleri, boyutsuz parametreler mesnet konumu, gerilme katsayısı ve mikrokirişlik katsayısına bağlı olarak elde edilmiştir.
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Year 2021,
Volume: 36 Issue: 2, 1089 - 1104, 05.03.2021
Şevki Akkoca
,
Süleyman Murat Bağdatlı
,
Necla Toğun
References
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- [3] Ahangar, S., Rezazadeh,G., Shabani, R., Ahmadi, G., Toloei, A. On the Stability of Microbeam Conveying Fluid Considering Modified Couple Stress Theory. International Journal of Mechanics and Materials in Design, 7(4), 327-342; 2011.
- [4] Akgöz, B., Civalek, Ö. Buckling Analysis of Functionally Graded Microbeams Based on Strain Gradient Theory. Acta Mechanica, 224(9), 2185-2201; 2013.
- [5] Şimşek, M., Aydın, M., Yurtcu, H. H., Reddy, J. N. Size-Dependent Vibration of a Microplate Under The Action of a Moving Load Based on The Modified Couple Stress Theory. Acta Mechanica, 226(11), 3807-3822; 2015.
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- [7] Ghayesh, M.H., Amabili, M., Farokhi, H. Nonlinear Forced Vibrations of a Microbeam Based on The Starin Gradient Elasticity Theory. International Journal of Engineering Science, 63, 52-60; 2012.
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- [10] El-Sayed, T.A., El-Mongy, H.H. Free Vibration and Stability Analysis of a Multi-Span Pipe Conveying Fluid Using Exact and Variational İteration Methods Combined with Transfer matrix Method. Applied Mathematical Modelling, 71, 173-193; 2019.
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- [20] Zhang, G. Y. , Gao, X. L., Ding, S. R. Band gaps for wave propagation in 2-D periodic composite structures incorporating microstructure effects. Acta Mechanica, 229, 4199–4214; 2018.
- [21] Bağdatlı, S.M., Öz, H.R.,Özkaya, E. Non-Linear Transverse Vibrations and 3:1 Internal Resonances of A Tensioned Beam On Multiple Supports. Mathematical and Computational Applications, 16(1), 203-215; 2011.
- [22] Wang,L. Size-depent vibration characteristics of fluid-conveying microtubes. Journal of Fluids and Structures, 26,675-684; 2010.