Chebyshev-Ritz and Navier's methods for hygro-magneto vibration of Euler-Bernoulli nanobeam resting on Winkler-Pasternak elastic foundation

This research employs Chebyshev-Ritz method along with Navier's method to investigate the vibration characteristics of a nanobeam subject to a longitudinal magnetic field and linear hygroscopic environment. The nanobeam is characterized by a Winkler-Pasternak elastic foundation and follows the nonlocal Euler-Bernoulli beam theory. The governing equation of motion is derived using Hamilton's principle, and non-dimensional frequency parameters are computed for Simply Supported-Simply Supported (SS), Clamped-Clamped (CC), and Clamped-Free (CF) boundary conditions. The motivation behind this study is to provide a comprehensive and efficient analytical framework for understanding the dynamic behavior of nanobeams in complex environments. By investigating the influence of magnetic and hygroscopic factors on the vibration characteristics of nanobeams, this research aims to offer valuable insights for the design and optimization of nanoscale structures. Employing shifted Chebyshev polynomials as shape functions in Chebyshev-Ritz method offers several advantages in the proposed model. Firstly, these polynomials possess orthogonal properties, which can significantly enhance computational efficiency. The orthogonality of shifted Chebyshev polynomials allow for simpler and more streamlined numerical computations compared to non-orthogonal basis functions. Additionally, the orthogonality ensures that the resulting system of equations is well-conditioned, even for higher-order polynomial approximations. A closed-form solution for SS boundary condition is obtained through Navier's method. Convergence analysis is performed to validate the accuracy and effectiveness of the proposed model against existing models. The non-dimensional frequency parameters obtained using both Navier's method and Chebyshev-Ritz method demonstrate strong agreement, further validating the proposed nanobeam model. Additionally, a comprehensive parametric study evaluates the impact of various characteristics, including the small-scale parameter, Winkler modulus, shear modulus, magnetic parameter, and hygroscopic parameter. The findings contribute to a nuanced understanding of nanobeam vibrations under the influence of a magnetic field and hygroscopic environment, providing valuable insights for the design and optimization of nanoscale structures in practical applications.