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Structural Engineering and Mechanics Volume 72, Number 2, October25 2019 , pages 229-244 DOI: https://doi.org/10.12989/sem.2019.72.2.229 |
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Flapwise and non-local bending vibration of the rotating beams |
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Mehrdad Mohammadnejad and Hamed Saffari
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| Abstract | ||
| Weak form integral equations are developed to investigate the flapwise bending vibration of the rotating beams. Rayleigh and Eringen nonlocal elasticity theories are used to investigate the rotatory inertia and Size-dependency effects on the flapwise bending vibration of the rotating cantilever beams, respectively. Through repetitive integrations, the governing partial differential equations are converted into weak form integral equations. The novelty of the presented approach is the approximation of the mode shape function by a power series which converts the equations into solvable one. Substitution of the power series into weak form integral equations results in a system of linear algebraic equations. The natural frequencies are determined by calculation of the non-trivial solution for resulting system of equations. Accuracy of the proposed method is verified through several numerical examples, in which the influence of the geometry properties, rotatory inertia, rotational speed, taper ratio and size-dependency are investigated on the natural frequencies of the rotating beam. Application of the weak form integral equations has made the solution simpler and shorter in the mathematical process. Presented relations can be used to obtain a close-form solution for quick calculation of the first five natural frequencies of the beams with flapwise vibration and non-local effects. The analysis results are compared with those obtained from other available published references. | ||
| Key Words | ||
| flapwise, size-dependency, weak form integral equation, natural frequency, Rayleigh beam, nonlocal elasticity theory | ||
| Address | ||
| Mehrdad Mohammadnejad/Birjand University of Technology Hamed Saffari/Shahid Bahonar University of Kerman | ||