Iranian Society of Acoustics and Vibration and Avecina Journal of Theoretical and Applied Vibration and Acoustics 2423-4761 11 2 2025 08 30 Influence of non-local parameter on period doubling behavior of CNTs conveying nanoparticles 109 122 723924 10.22064/tava.2025.2049773.1259 EN Reza Ebrahimi Assistant Professor, Mechanical Engineering, Faculty of Engineering, Yasouj University, Yasouj 75918-74831, Iran 0000-0002-0118-437X Mohammad Sajjadnejad Assistant Professor, Materials Engineering, Faculty of Engineering, Yasouj University, Yasouj 75918-74831, Iran Journal Article 2025 01 03 In drug delivery systems, carbon nanotubes (CNTs) can be used as molecular channels to transport nanoparticles. In these applications, CNTs are subjected to a moving load, which leads to nonlinear vibrations of the CNTs. Therefore, the main goal of this study is to analyze the bifurcation behavior of CNTs under the effect of moving harmonic load. For this purpose, modeling of the system has been done using the non-local Euler-Bernoulli beam theory and Winkler spring. The Galerkin approach and Runge-Kutta method have been used to discretize and solve the equation of motion, respectively. The effects of the moving load, elastic bed stiffness and non-local elasticity parameter on the nonlinear dynamic response of the system have been investigated by using the bifurcation diagrams, phase plane, power spectrum and Poincare sections. The results indicate various non-linear behaviors such as the jump phenomenon, the periodic, subharmonic and quasi-periodic movements in the system response. https://tava.isav.ir/article_723924_a0f0d8795d67e9f44602a54bd5006ad9.pdf