Characterization and Modeling of CNT Based Actuators

2008 ◽  
Author(s):  
Johannes Riemenschneider
Keyword(s):  
Carbon Nanotube ◽  
Dynamic Response ◽  
Solid Electrolyte ◽  
Aqueous Electrolyte ◽  
System Response ◽  
General Behavior ◽  
Characteristic Measure ◽  
Reproducible Characteristic

In order to get an understanding of the general characteristics of Carbon Nanotube (CNT) based actuators, the system response of the actuator was analyzed. Special techniques were developed in order to generate a reproducible characteristic measure for the material: the R-Curve. On top, the dynamic response of the system was evaluated in different states of the actuator. A model was generated to capture the general behavior of the system. At last an actuator incorporating solid electrolyte was built and tested, showing similar characteristics as the actuator in aqueous electrolyte.

scholarly journals Formation of a solid electrolyte interface on single wall carbon nanotube electrodes in lithium ion batteries

TANSO ◽  
2009 ◽  
Vol 2009 (240) ◽  
pp. 221-225
Author(s):  
Hisatoshi Koshikawa ◽  
Hiroatsu Todoriki ◽  
Atsushi Kondo ◽  
Yoshiyuki Hattori ◽  
Fujio Okino ◽  
...  
Keyword(s):  
Carbon Nanotube ◽  
Solid Electrolyte ◽  
Lithium Ion Batteries ◽  
Lithium Ion ◽  
Solid Electrolyte Interface ◽  
Single Wall Carbon Nanotube ◽  
Single Wall Carbon ◽  
Electrolyte Interface

scholarly journals The Dynamic Response of Tuned Impact Absorbers for Rotating Flexible Structures

2005 ◽  
Vol 1 (1) ◽  
pp. 13-24 ◽  
Author(s):  
Steven W. Shaw ◽  
Christophe Pierre
Keyword(s):  
Dynamic Response ◽  
Flexible Structures ◽  
Experimental Studies ◽  
Analytical Investigation ◽  
Design Parameters ◽  
System Response ◽  
Rotor Speed ◽  
Flexible System ◽  
Restoring Forces ◽  
And Performance

This paper describes an analytical investigation of the dynamic response and performance of impact vibration absorbers fitted to flexible structures that are attached to a rotating hub. This work was motivated by experimental studies at NASA, which demonstrated the effectiveness of these types of absorbers for reducing resonant transverse vibrations in periodically excited rotating plates. Here we show how an idealized model can be used to describe the essential dynamics of these systems, and used to predict absorber performance. The absorbers use centrifugally induced restoring forces so that their nonimpacting dynamics are tuned to a given order of rotation, whereas their large amplitude dynamics involve impacts with the primary flexible system. The linearized, nonimpacting dynamics are first explored in detail, and it is shown that the response of the system has some rather unique features as the hub rotor speed is varied. A class of symmetric impacting motions is also analyzed and used to predict the effectiveness of the absorber when operating in its impacting mode. It is observed that two different types of grazing bifurcations take place as the rotor speed is varied through resonance, and their influence on absorber performance is described. The analytical results for the symmetric impacting motions are also used to generate curves that show how important absorber design parameters—including mass, coefficient of restitution, and tuning—affect the system response. These results provide a method for quickly evaluating and comparing proposed absorber designs.

Chaotic vibrations of a harmonically excited carbon nanotube with consideration of thermomagnetic filed and surface effects

2019 ◽  
Vol 233 (10) ◽  
pp. 3649-3658 ◽  
Author(s):  
H Ramezannejad Azarboni ◽  
SA Edalatpanah
Keyword(s):  
Carbon Nanotube ◽  
Dynamic Response ◽  
Governing Equation ◽  
Surface Effect ◽  
Time History ◽  
Integration Scheme ◽  
Beam Model ◽  
Single Walled Carbon Nanotube ◽  
Single Walled Carbon ◽  
Chaotic Vibrations

In the studies of the dynamic response of carbon nanotubes, the stability, predictable, and unpredictable chaotic vibrations are fundamental characteristics. In this paper, we investigate the chaotic and periodic vibrations of a single-walled carbon nanotube resting on the viscoelastic foundation, based on the nonlocal Euler–Bernoulli beam model. It is assumed that the single-walled carbon nanotube is subjected to an external harmonic excitation. The axial thermomagnetic field and the surface effect on the governing equation of single-walled carbon nanotube are taken into account. We also solve the nonlinear governing equation by using the Galerkin decomposition method along with the fourth-order Rung–Kutta numerical integration scheme. Furthermore, we analyze the effects of amplitude and frequency of excitation on the formation of chaotic and periodic regions using bifurcation diagrams and largest Lyapunov exponents. Moreover, we present the phase portrait, Poincare maps, and time history to observe the periodic and chaotic responses of the system. The results show that the nonlinear dynamic response of single-walled carbon nanotube is much more sensitive to both amplitude and frequency of excitation.

Frequency Response of a Fractional Derivative Viscoelastic Type Lined Tunnel with Partial Sealing

2011 ◽  
Vol 368-373 ◽  
pp. 2692-2697
Author(s):  
Hua Xi Gao ◽  
Min Jie Wen ◽  
Rong Xin Li
Keyword(s):  
Dynamic Response ◽  
Fractional Derivative ◽  
Material Parameter ◽  
Fluid Pressure ◽  
Great Influence ◽  
Saturated Soil ◽  
System Response ◽  
Axisymmetric Load ◽  
Permeability Parameter ◽  
Viscoelastic Constitutive Model

Based on Biot saturated soil theory, steady state dynamic response of the system is studied in the frequency domain when the inner boundary of a fractional derivative viscoelastic type circular lined tunnel is under the axisymmetric load and fluid pressure respectively. On the basis of introducing a partial permeable boundary condition, the solutions of stress, displacement and pore pressure of the lining and saturated soil are obtained by the inner boundary of the lining and continuity conditions of the interface, besides, the stress-displacement constitutive behavior of the lining is described by fractional derivative viscoelastic constitutive model. The influence of physical parameter on the system response is investigated. It is shown that the order of fractional derivative model has a great influence on the system dynamic response, and it depends on material parameter of the lining when the inner boundary of lining is subjected to axisymmetric load. The permeability parameter of lining has significant effects on system response induced by fluid pressure.

Dynamic response of carbon nanotube field-effect transistors analyzed by S-parameters measurement

2006 ◽  
Vol 135 (3) ◽  
pp. 294-296 ◽  
Author(s):  
J.-M. Bethoux ◽  
H. Happy ◽  
G. Dambrine ◽  
V. Derycke ◽  
M. Goffman ◽  
...  
Keyword(s):  
Carbon Nanotube ◽  
Dynamic Response ◽  
Field Effect ◽  
Field Effect Transistors ◽  
S Parameters ◽  
Parameters Measurement

Dynamic response of a carbon nanotube-based rotary nano device with different carbon-hydrogen bonding layout

2016 ◽  
Vol 365 ◽  
pp. 352-356 ◽  
Author(s):  
Hang Yin ◽  
Kun Cai ◽  
Jing Wan ◽  
Zhaoliang Gao ◽  
Zhen Chen
Keyword(s):  
Hydrogen Bonding ◽  
Carbon Nanotube ◽  
Dynamic Response

An Experimental and Analytical Investigation of the Dynamic Response of a High-Speed Cam-Follower System. Part 1: Experimental Investigation

1983 ◽  
Vol 105 (4) ◽  
pp. 692-698 ◽  
Author(s):  
A. P. Pisano ◽  
F. Freudenstein
Keyword(s):  
Dynamic Response ◽  
High Speed ◽  
Dynamic Models ◽  
Analytical Investigation ◽  
System Response ◽  
Pathological System ◽  
Cam Design ◽  
Cam Follower ◽  
System Part ◽  
Basic Experiments

This paper is concerned with filling two gaps in the cam design field: (a) the absence of adequate measurements of the dynamic response of cam-follower systems, and (b) the need for the development of a predictive dynamic model for both normal and pathological system behavior. Part 1 presents the results of basic experiments on the dynamic response of a modern, high-speed cam-follower system. These data, which we believe to be the most comprehensive available in the open literature, and which are described more fully in [11], can be used by research investigators both in understanding system response and in developing and evaluating predictive dynamic models.

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