This paper presents vibration control analysis for a cantilever nanobeam system. The dynamics of the system is obtained by the non-local elastic relationship which characterizes the small scale effects. The boundary conditions and governing equation are respectively expressed by several ordinary differential equations (ODE) and a partial differential equation (PDE) with the help of the Hamilton's principle. Model-based control and adaptive control are both designed at the free end to regulate the vibration in the control section. By employing the Lyapunov stability approach, the system state can be proven to be substantiated to converge to zero's small neighbourhood with appropriate parameters. Simulation results illustrate that the designed control is feasible for the nanobeam system.
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http://dx.doi.org/10.1016/j.isatra.2020.05.038 | DOI Listing |
Nat Nanotechnol
August 2024
School of Electrical and Electronic Engineering, Nanyang Technological University, Singapore, Singapore.
Mechanical forces induced by high-speed oscillations provide an elegant way to dynamically alter the fundamental properties of materials such as refractive index, absorption coefficient and gain dynamics. Although the precise control of mechanical oscillation has been well developed in the past decades, the notion of dynamic mechanical forces has not been harnessed for developing tunable lasers. Here we demonstrate actively tunable mid-infrared laser action in group-IV nanomechanical oscillators with a compact form factor.
View Article and Find Full Text PDFNanomaterials (Basel)
February 2024
Department of Civil Engineering, University of Salerno, 84084 Fisciano, Italy.
This paper employs a surface stress-driven nonlocal theory to investigate the synergistic impact of long-range interaction and surface energy on higher vibration modes of Bernoulli-Euler nanobeams made of functionally graded material. It takes into account surface effects such as the surface modulus of elasticity, residual surface stresses, surface density, and rotary inertia. The governing equation is derived through the application of Hamilton's principle.
View Article and Find Full Text PDFMicromachines (Basel)
May 2021
Fujian Provincial Key Laboratory of Advanced Materials, College of Materials, Xiamen University, Xiamen 361005, China.
The flexoelectric effect has a significant influence on the electro-mechanical coupling of micro-nano devices. This paper studies the mechanical and electrical properties of functionally graded flexo-piezoelectric beams under different electrical boundary conditions. The generalized variational principle and Euler-Bernoulli beam theory are employed to deduce the governing equations and corresponding electro-mechanical boundary conditions of the beam model.
View Article and Find Full Text PDFSci Rep
January 2021
College of Water Resources and Architectural Engineering, Northwest A&F University, Yangling, 712100, China.
Nanotube can be used as a mass sensor. To design a mass sensor for evaluating a high-speed nanoparticle, in this study, we investigated the impact vibration of a cantilever nanobeam being transversally collided by a high-speed C at the beam's free end with an incident velocity of v. The capped beam contains alternately two boron nitride zones and two carbon zones on its cross section.
View Article and Find Full Text PDFISA Trans
October 2020
The Institute of Artificial Intelligence, University of Science and Technology Beijing, Beijing 100083, China; The School of Automation and Electrical Engineering, University of Science and Technology Beijing, Beijing 100083, China. Electronic address:
This paper presents vibration control analysis for a cantilever nanobeam system. The dynamics of the system is obtained by the non-local elastic relationship which characterizes the small scale effects. The boundary conditions and governing equation are respectively expressed by several ordinary differential equations (ODE) and a partial differential equation (PDE) with the help of the Hamilton's principle.
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