A Tutorial on the Mechanisms, Dynamics, and Control of Atomic Force Microscopes

2007 ◽  
Author(s):  
Daniel Y. Abramovitch ◽  
Sean B. Andersson ◽  
Lucy Y. Pao ◽  
Georg Schitter
Keyword(s):  
Atomic Force Microscopes ◽  
Atomic Force ◽  
Dynamics And Control ◽  
And Control

Nonlinear Dynamics and Control of the Scan Process in Noncontacting Atomic Force Microscopy

2005 ◽  
Author(s):  
S. Hornstein ◽  
O. Gottlieb ◽  
L. Ioffe
Keyword(s):  
Nonlinear Dynamics ◽  
Atomic Force Microscopy ◽  
Numerical Study ◽  
Initial Boundary ◽  
Atomic Interaction ◽  
Force Microscopy ◽  
Atomic Force ◽  
Dynamics And Control ◽  
And Control ◽  
Nonlinear Dynamics And Control

The focus of this paper is on the nonlinear dynamics and control of the scan process in noncontacting atomic force microscopy. An initial-boundary-value problem is consistently formulated to include both nonlinear dynamics of a microcantilever with a localized atomic interaction force for the surface it is mapping, and a horizontal boundary condition for a constant scan speed and its control. The model considered is obtained using the extended Hamilton’s principle which yields two partial differential equations for the combined horizontal and vertical motions. Isolation of a Lagrange multiplier describing the microbeam fixed length enables construction of a modified equation of motion which is reduced to a single mode dynamical system via Galerkin’s method. The analysis includes a numerical study of the strongly nonlinear system leading to a stability map describing an escape bifurcation threshold where the tip, at the free end of the microbeam, ‘jumps-to-contact’ with the sample. Results include periodic ultrasubharmonic and quasiperiodic solutions corresponding to primary and secondary resonances.

PROJECT ON ELECTRONIC STEERING SYSYTEM

2018 ◽  
Vol 4 (5) ◽  
pp. 7
Author(s):  
Shivam Dwivedi ◽  
Prof. Vikas Gupta
Keyword(s):  
Steering System ◽  
Essential Elements ◽  
Variable Pressure ◽  
Passenger Cars ◽  
Control Techniques ◽  
Steering Mechanism ◽  
Dynamics And Control ◽  
Active Research ◽  
Electronic Steering ◽  
And Control

As the four-wheel steering (4WS) system has great potentials, many researchers' attention was attracted to this technique and active research was made. As a result, passenger cars equipped with 4WS systems were put on the market a few years ago. This report tries to identify the essential elements of the 4WS technology in terms of vehicle dynamics and control techniques. Based on the findings of this investigation, the report gives a mechanism of electronically controlling the steering system depending on the variable pressure applied on it. This enhances the controlling and smoothens the operation of steering mechanism.

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