scholarly journals Multi-Degree of Freedom Dynamic Characterization of Deep-Etched Silicon Suspensions

2000 ◽  
Author(s):  
D.A. Horsley ◽  
P.G. Hartwell ◽  
R.G. Walmsley ◽  
J. Brandt ◽  
U. Yoon ◽  
...  
Keyword(s):  
Degree Of Freedom ◽  
Dynamic Characterization ◽  
Etched Silicon

scholarly journals Parametric modelling and dynamic characterization of a two-degree-of-freedom twin-rotor multi-input multi-output system

2001 ◽  
Vol 215 (2) ◽  
pp. 63-78 ◽  
Author(s):  
S M Ahmad ◽  
A J Chipperfield ◽  
M O Tokhi
Keyword(s):  
Mimo System ◽  
Degree Of Freedom ◽  
Parametric Modelling ◽  
Dynamic Characterization ◽  
Identification Technique ◽  
New Generation ◽  
And Control ◽  
Two Degree Of Freedom ◽  
Twin Rotor

A mathematical model for the dynamic characterization of a two-degree-of-freedom (2 DOF) twin-rotor multi-input multi-output (MIMO) system (TRMS) in hover is extracted using a black box system identification technique. The behaviour of the TRMS, in certain aspects, resembles that of a helicopter, with a significant cross-coupling between longitudinal and lateral directional motions. Hence, it is an interesting identification and control problem. Identification for a 2 DOF, rigid-body, discrete-time linear model is presented in detail. The extracted model has a good degree of prediction capability. The modelling approach presented is suitable for complex new-generation air vehicles.

Dynamic Characterization of a Two Degree of Freedom Planetary Gearbox During Varying Load Conditions

2019 ◽  
Author(s):  
Claudia González-Cruz ◽  
Juan Jauregui ◽  
Marco Ceccarelli
Keyword(s):  
Load Condition ◽  
Nonlinear Behavior ◽  
Degree Of Freedom ◽  
Operating Speed ◽  
Dynamic Characterization ◽  
Radial Vibrations ◽  
Planetary Gearbox ◽  
Input Shaft ◽  
Two Degree Of Freedom

Abstract This paper presents the dynamic characterization of a two degree of freedom planetary gearbox prototype during the variation of the load condition. Tests with varying load are developed at three different operating speeds of the input shaft: 190, 380 and 590 rpm. The dynamic torques and vibrations on the input and output shafts are acquired during the experiments, such as the angular velocity of the output shaft. The experimental data are analyzed to evaluate the dynamics of the system during the exchange of operation between the first and second DOF operation. Then, the radial vibrations are analyzed during the operation of the second DOF by means of a methodology using different signal processing tools: first, the continuous wavelet transform is used to identify the nonlinear behavior and the main frequency content of the system; then, the vibrations are filtered by means of passband filters in order to keep the main frequencies of the system and delete any other; finally, the filtered signals are analyzed with both, the Kuramoto’s order parameter to quantify the dynamic synchronization of the gearbox and the phase diagram to characterize its stability. The results demonstrates the utility of the second DOF in the design of the planetary gearbox in order to avoid excessive torques in the components of the system. Furthermore, it is found that the synchronization of the system increases at higher operating speed, however, the system becomes unstable as the operating speed is increased.

scholarly journals Structural and dynamic characterization of the C-terminal tail of ErbB2: disordered but not random

2021 ◽  
Author(s):  
L. Pinet ◽  
Y.-H. Wang ◽  
C. Deville ◽  
E. Lescop ◽  
F. Guerlesquin ◽  
...  
Keyword(s):  
Dynamic Characterization

Dynamic characterization of small lead-acid cells

2001 ◽  
Vol 96 (1) ◽  
pp. 151-159 ◽  
Author(s):  
Alvin Salkind ◽  
Terrill Atwater ◽  
Pritpal Singh ◽  
Sudarshan Nelatury ◽  
Sangeetha Damodar ◽  
...  
Keyword(s):  
Dynamic Characterization ◽  
Lead Acid

scholarly journals Dynamic Characterization of Cercal Mechanosensory Hairs of Crickets

Insects ◽  
2012 ◽  
Vol 3 (4) ◽  
pp. 1028-1038
Author(s):  
Joel M. Book ◽  
Samuel F. Asokanthan
Keyword(s):  
Dynamic Characterization

Dynamic Characterization of Viscoelastic Materials

2004 ◽  
Author(s):  
Eduardo Romann Martini ◽  
Andrea Tonoli ◽  
Nicola Amati ◽  
Andrea Guala
Keyword(s):  
Dynamic Characterization ◽  
Viscoelastic Materials

Dynamic Characterization of a Valveless Micropump Considering Entrapped Gas Bubbles

2013 ◽  
Vol 135 (9) ◽  
Author(s):  
Songjing Li ◽  
Jixiao Liu ◽  
Dan Jiang
Keyword(s):  
Numerical Simulation ◽  
Theoretical Model ◽  
Experimental Studies ◽  
Gas Bubbles ◽  
Chamber Pressure ◽  
Dynamic Characterization ◽  
Valveless Micropump ◽  
Performance Deterioration ◽  
Trapped Gas

Unexpected gas bubbles in microfluidic devices always bring the problems of clogging, performance deterioration, and even device functional failure. For this reason, the aim of this paper is to study the characterization variation of a valveless micropump under different existence conditions of gas bubbles based on a theoretical modeling, numerical simulation, and experiment. In the theoretical model, we couple the vibration of piezoelectric diaphragm, the pressure drop of the nozzle/diffuser and the compressibility of working liquid when gas bubbles are entrapped. To validate the theoretical model, numerical simulation and experimental studies are carried out to investigate the variation of the pump chamber pressure influenced by the gas bubbles. Based on the numerical simulation and the experimental data, the outlet flow rates of the micropump with different size of trapped gas bubbles are calculated and compared, which suggests the influence of the gas bubbles on the dynamic characterization of the valveless micropump.

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