Global sensitivity analysis of backside coating parameters on dynamic response of AM-AFM

  • Kaveh E. Torkanpouri Department of Mechanical and Aerospace Engineering, Science and Research Branch, Islamic Azad University, Tehran Iran,
  • Hassan Zohoor Center of Excellence in Design, Robotics and Automation (CEDRA), Mechanical Engineering Department, Sharif University of Technology, Tehran, Iran The Academy of Sciences of IR Iran, Tehran, Iran
  • Moharam H. Korayem Department of Mechanical and Aerospace Engineering, Science and Research Branch, Islamic Azad University, Tehran, Iran
Keywords: AM-AFM, Global sensitivity analysis, Nonlinear vibration, Coated cantilever, Backside Coating parameters, Timoshenko beam theory

Abstract

Influence of backside coating parameters on dynamic response of AM-AFM is modeled. Timoshenko based beam model is used and the general nonlinear interaction force is enclosed. The coupled ODEs of motion are achieved. The mode shapes are determined for coated cantilever and the natural frequency of each mode is validated with experimental results. It is showed a shorter cantilever with tip mass have better accuracy and inelastic and massless assumptions are not proper choice for modelling of the coating. The assumed mode method is used to determine time response of system for faraway and scanning condition of AM-AFM. Amplitude of response is calculated by FFT of time domain. Sensitivity indices of backside coating parameters are determined based on Sobol method in their physical range. It is showed the sequence of indices remains unchanged. The most important parameters and interactions on output variance are introduced. The results are concluded.

DOI: http://dx.doi.org/10.5755/j01.mech.23.2.13908

Published
2017-05-03
Section
MECHANICAL TECHNOLOGIES