Journals / Pamukkale Üniversitesi Mühendislik Bilimleri Dergisi / 2017 / Cilt: 23 - Sayı: 1

Free vibrations analysis of fluid conveying nanobeam based on nonlocal elasticity theory

Yerel olmayan elastisite teorisine göre akışkan taşıyan nanokirişin serbest titreşimlerinin analizi

Pages
6–11
Publication Date
2017-03-01
DOI
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AI Summary & Key Takeaways

AI Insight
⚡ TL;DR(Too Long; Didn't Read)

The results are presented and interpreted by graphics.

📌 3 Key Takeaways

🎯
Objective & Hypothesis:In this study, linear vibration analysis of a nanobeam conveying fluid is investigated under simple-simple and clamped-clamped boundary conditions.
📊
Key Findings & Data:For both boundary conditions, the natural frequencies are decreased by increasing the nonlocal parameter and the fluid velocity .
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Conclusion & Impact:The results are presented and interpreted by graphics.
🔬Design:Modeling & Simulation
📍Scope:Comprehensive Sample
⚙️Variables:Titreşim · Akışkan taşıyan nano ölçekli kiriş · Perturbasyon metodu

Abstract

In this study, linear vibration analysis of a nanobeam conveying fluid is investigated under simple-simple and clamped-clamped boundary conditions. Eringen’s nonlocal elasticity theory is applied to Euler-Bernoulli beam model. Nonlocal elasticity theory is a popular growing technique for the mechanical analyses of MEMS and NEMS structures. The Hamilton’s principle is employed to derive the governing equations and boundary conditions. Non-dimensional form of equations is obtained. The obtained equations of motion and boundary conditions are independent from material and geometric structure. It is assumed that fluid velocity is harmonically changed about a constant average speed. Approximate solutions were obtained using the Method of Multiple Scales, a perturbation method. The first term in perturbation series composes linear problem. Natural frequencies and mode shapes are calculated by solving the linear problem for different boundary conditions. For both boundary conditions, the natural frequencies are decreased by increasing the nonlocal parameter and the fluid velocity . The results are presented and interpreted by graphics.

Özet

Bu çalışmada, basit-basit ve ankastre-ankastre sınır şartları altında akışkan taşıyan nanokirişin doğrusal titreşimleri incelenmiştir. Eringen’in yerel olmayan elastisite teorisi Euler-Bernoulli kiriş modeline uygulanmıştır. Yerel olmayan elastisite teorisi MEMS ve NEMS yapıların mekaniksel analizinde gelişen popüler bir tekniktir. Hareket denklemlerini ve sınır şartlarını elde etmek için Hamilton prensibi kullanılmıştır. Denklemler boyutsuz formda elde edilmiştir. Elde edilen hareket denklemi ve sınır şartları malzeme ve geometrik yapıdan bağımsız hale getirilmiştir. Akışkan hızının, ortalama sabit bir hız etrafında harmonik olarak değiştiği kabul edilmiştir. Perturbasyon metotlarından biri olan çok zaman ölçekli metot kullanılarak yaklaşık çözümler elde edilmiştir. Perturbasyon serisindeki ilk terim doğrusal problemi oluşturmaktadır. Doğrusal problemin çözümü ile tabii frekanslar ve mod yapıları farklı sınır şartları için hesaplanmıştır. Her iki mesnet durumu için yerel olmayan parametre ve akışkan hızı artığında tabii frekanslar azalmaktadır. Sonuçlar grafiklerle sunulmuş ve yorumlanmıştır.

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Cite This Article

Bağdatlı, S. M., Toğun, N. (2017). Free vibrations analysis of fluid conveying nanobeam based on nonlocal elasticity theory. Pamukkale Üniversitesi Mühendislik Bilimleri Dergisi, Cilt: 23 - Sayı: 1, 6–11. https://ajindex.com/articles/42555

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