scholarly journals On the dynamic response of flexible structures coupled through viscous fluid layers

1990 ◽  
Vol 87 (S1) ◽  
pp. S137-S137
Author(s):  
Chin‐An Tan
Keyword(s):  
Viscous Fluid ◽  
Dynamic Response ◽  
Flexible Structures ◽  
Fluid Layers

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.

Frequency control and its effect on the dynamic response of flexible structures

AIAA Journal ◽  
1985 ◽  
Vol 23 (11) ◽  
pp. 1768-1774 ◽  
Author(s):  
Vipperla B. Venkayya ◽  
Victoria A. Tischler
Keyword(s):  
Dynamic Response ◽  
Frequency Control ◽  
Flexible Structures

The Rayleigh–Taylor instability of viscous fluid layers

1997 ◽  
Vol 9 (6) ◽  
pp. 1635-1649 ◽  
Author(s):  
A. Elgowainy ◽  
N. Ashgriz
Keyword(s):  
Viscous Fluid ◽  
Taylor Instability ◽  
Fluid Layers ◽  
Rayleigh Taylor Instability

Aerodynamic Damping and Fluid-Structure Interaction of Blast Loaded Flexible Structures

2011 ◽  
Vol 82 ◽  
pp. 491-496
Author(s):  
Martien Teich ◽  
Norbert Gebbeken ◽  
Martin Larcher
Keyword(s):  
Dynamic Response ◽  
Fluid Structure Interaction ◽  
Flexible Structures ◽  
Blast Loads ◽  
Damping Term ◽  
Damping Force ◽  
Fluid Structure ◽  
Structure Interaction ◽  
Aerodynamic Damping ◽  
Compliant Systems

This paper analyses the e ects of air-structure interaction of systems subjectedto weak blast loads. While these coupling e ects are negligible for typical steel or concretestructures, they may dominate the dynamic response of lighter and more exible (compliant)systems like membranes, blast curtains or cable facades. For these light and exible systems,a classical decoupled analysis, i.e., neglecting the inuence of the surrounding air, might sig-ni cantly overestimate the deections and strains. However, we show that the coupling e ectscan be accounted for by basically adding a viscous aerodynamic damping force. We discussand compare two approaches how to obtain the aerodynamic damping term. With decreasingstructural sti ness and mass, the damping contribution of air increases signi cantly. The resultsof Hydrocode simulations are presented, and an outlook into further areas of research is given.

Nonlinear model of a granulated medium containing viscous fluid layers and gas cavities

2012 ◽  
Vol 58 (1) ◽  
pp. 99-106 ◽  
Author(s):  
O. V. Rudenko ◽  
A. L. Sobisevich ◽  
L. E. Sobisevich ◽  
C. M. Hedberg ◽  
N. V. Shamaev
Keyword(s):  
Viscous Fluid ◽  
Nonlinear Model ◽  
Fluid Layers
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