2011/05/01 by Chao Chen, Ming Ma, Jefferson Zhe Liu +2 · 20 citations
Materials Science · Physics and Astronomy · #Carbon Nanotubes in Composites #Dynamics (music) #Mechanical and Optical Resonators #Nonlocal and gradient elasticity in micro/nano structures #Resonator #Thermal #Thermal fluctuations #Thermoelastic damping #Viscous damping #cond-mat.mes-hall #cond-mat.mtrl-sci
paper · pdf · doi:10.1063/1.3619854
published in Journal of Applied Physics 110(3) (American Institute of Physics) · 15 pages, 5 figures
arxiv created 2011/05/01 · openalex publication_date 2011/08/01 · arxiv updated 2015/05/28 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05
A nanobeam resonator is a key mechanical component of a nano-electromechanical system. Because of its small dimensions, the system can reach very high frequencies, but it is also very sensitive to its environment, as a large surface area of the material is exposed. Molecular dynamics (MD) simulations and theoretical analysis are used here to quantitatively predict the damping behavior of a nanobeam, including its critical damping conditions and lifetime, directly mapping fluid-structure properties and interaction into dynamics. We show here how the humidity defines the critical damping condition through viscous forces, marking the transition from the under-damping to the over-damping regime at elevated humidity. Phenomena such as thermal fluctuations and the paddling effect are also discussed with an explanation using a simple one-dimensional model.