On the instability of parametrically excited two degrees of freedom vibrating systems with viscous damping

Meccanica ◽  
1967 ◽  
Vol 2 (4) ◽  
pp. 243-255 ◽  
Author(s):  
Emilio Massa
Keyword(s):  
Degrees Of Freedom ◽  
Viscous Damping ◽  
Parametrically Excited ◽  
Two Degrees Of Freedom ◽  
Vibrating Systems

scholarly journals On Nonconservative Stability Problems of Elastic Systems With Slight Damping

1966 ◽  
Vol 33 (1) ◽  
pp. 125-133 ◽  
Author(s):  
G. Herrmann ◽  
I. C. Jong
Keyword(s):  
Degrees Of Freedom ◽  
Compressive Load ◽  
Viscous Damping ◽  
Two Degrees Of Freedom ◽  
Stability Problems ◽  
Damping Coefficients ◽  
Stability And Instability ◽  
Elastic Systems ◽  
Nonconservative Loading ◽  
Two Degree Of Freedom

A linear two-degree-of-freedom system with slight viscous damping and subjected to nonconservative loading is analyzed with the aim of studying the effects of damping on stability of equilibrium. It is found that, in such systems, multiple ranges of stability and instability may exist in a richer variety than in corresponding systems without damping. Further, for certain systems, instability either by divergence (static buckling) or by flutter may occur first as the compressive load increases, depending upon the ratio of the damping coefficients in the two degrees of freedom. It is shown finally that systems exist for which the destabilizing effect of slight viscous damping cannot be removed completely whatever the ratio of the (positive) damping coefficients.

Estimation of Erythrocyte Deformability Using a Viscoelastic Model With Two Degrees of Freedom

2011 ◽  
Author(s):  
Tatsuya Mori ◽  
Takashi Saito
Keyword(s):  
Degrees Of Freedom ◽  
Viscoelastic Model ◽  
Estimation Method ◽  
Major Axis ◽  
Normal Subjects ◽  
Data Series ◽  
Viscous Damping ◽  
Two Degrees Of Freedom ◽  
Field Displacement ◽  
Movement And Deformation

An erythrocyte is represented using a viscoelastic model with two degrees of freedom, where a spring was connected parallel to a dashpot to estimate quantitatively the dynamic deformability. To identify such parameters as the elastic modulus and viscous damping coefficient of the model, erythrocytes were deformed using a periodical shear flow field. Displacement of the center of gravity ΔG and the deformation quantity of major axis ΔL were obtained from time series of images. In this paper, erythrocytes from a normal subjects were treated with glutaraldehyde to create variations in hardness and deformability. Both of the data series are periodic on movement and deformation of erythrocytes. Based on the experimental data, parameters of the viscoelastic model were identified. The estimation method of dynamic deformability of erythrocytes was examined.

The scientific bases of autocontrol with vibration phase for a resonance beating-vibration system with two degrees of freedom driven by debalances

1996 ◽  
Vol 18 (2) ◽  
pp. 43-48
Author(s):  
Tran Van Tuan ◽  
Do Sanh ◽  
Luu Duc Thach
Keyword(s):  
Degrees Of Freedom ◽  
Regulation System ◽  
Vibration System ◽  
Two Degrees Of Freedom ◽  
System Operating

In the paper it is introduced a method for studying dynamics of beating-vibrators by means of digital calculation with the help of the machine in accordance with the needs by the helps of an available auto regulation system operating with high reability.

scholarly journals Two Degrees of Freedom Slip Controller with Lateral Torque Distribution

2020 ◽  
Vol 53 (2) ◽  
pp. 14450-14455
Author(s):  
Wolfgang Degel ◽  
Stefan Lupberger ◽  
Dirk Odenthal ◽  
Naim Bajcinca
Keyword(s):  
Degrees Of Freedom ◽  
Torque Distribution ◽  
Two Degrees Of Freedom
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