DYNAMIC STABILITY OF A VISCOELASTIC BEAM SUBJECTED TO HARMONIC AND PARAMETRIC EXCITATIONS SIMULTANEOUSLY

1996 ◽  
Vol 198 (1) ◽  
pp. 1-16 ◽  
Author(s):  
R.-F. Fung ◽  
J.-S. Huang ◽  
W.-H. Chen
Keyword(s):  
Dynamic Stability ◽  
Viscoelastic Beam

DYNAMIC STABILITY OF AN AXIALLY ACCELERATING VISCOELASTIC BEAM WITH TWO FIXED SUPPORTS

2006 ◽  
Vol 06 (01) ◽  
pp. 31-42 ◽  
Author(s):  
X.-D. YANG ◽  
L.-Q. CHEN
Keyword(s):  
Dynamic Stability ◽  
Viscosity Coefficient ◽  
Constitutive Law ◽  
Viscoelastic Beam ◽  
Kelvin Model ◽  
Averaged Equations ◽  
Beam Bending ◽  
The Mean ◽  
The Stability ◽  
The Galerkin Method

The dynamic stability of an axially accelerating viscoelastic beam with two fixed supports is investigated. The Kelvin model is used for the constitutive law of the beam. A small simple harmonic is allowed to fluctuate about the constant mean speed applied to the beam, and the governing equation is truncated using the Galerkin method based on the eigenfunctions of the stationary beam. The averaged equations are derived for the cases of subharmonic and combination resonance. Finally, numerical examples are presented to demonstrate the effects of the viscosity coefficient, the mean axial speed and the beam bending stiffness on the stability boundaries.

Dynamic stability of an axially accelerating viscoelastic beam

2004 ◽  
Vol 23 (4) ◽  
pp. 659-666 ◽  
Author(s):  
Li-Qun Chen ◽  
Xiao-Dong Yang ◽  
Chang-Jun Cheng
Keyword(s):  
Dynamic Stability ◽  
Viscoelastic Beam

Dynamic Stability Analysis of Viscoelastic Beam under the Follower Forces

2011 ◽  
Vol 413 ◽  
pp. 283-288
Author(s):  
Rui Hua Zhuo ◽  
Shu Wang Yan ◽  
Lei Yu Zhang
Keyword(s):  
Differential Equation ◽  
Boundary Condition ◽  
Stability Analysis ◽  
Power Series ◽  
Dynamic Stability ◽  
Vibration Frequency ◽  
Time Domain ◽  
Differential Operators ◽  
Viscoelastic Beam ◽  
Follower Forces

The unification differential equation of buckling and motion of viscoelastic beam subjected to the uniformly distributed follower forces in time domain was established by differential operators including extension viscosity, shearing viscosity and moment of inertia. According to the unification differential equation, dynamic stability of three-parameter model of viscoelastic beams subjected to follower forces with clamped-free supported boundary condition was firstly analyzed by power series. The relations of the follower force versus vibration frequency and decay coefficient were obtained, so was the effect of viscous coefficient on the critical load of beams.

Molecular insights on the dynamic stability of peptide nucleic acid functionalized carbon and boron nitride nanotubes

2021 ◽  
Vol 23 (1) ◽  
pp. 219-228
Author(s):  
Nabanita Saikia ◽  
Mohamed Taha ◽  
Ravindra Pandey
Keyword(s):  
Nucleic Acid ◽  
Boron Nitride ◽  
Nucleic Acids ◽  
Dynamic Stability ◽  
Peptide Nucleic Acid ◽  
Rational Design ◽  
Peptide Nucleic Acids ◽  
Boron Nitride Nanotubes ◽  
Molecular Hybrids ◽  
Single Wall Nanotubes

The rational design of self-assembled nanobio-molecular hybrids of peptide nucleic acids with single-wall nanotubes rely on understanding how biomolecules recognize and mediate intermolecular interactions with the nanomaterial's surface.

When Rows Look Like Columns: Dynamic Stability of Grouping by Proximity

2000 ◽  
Author(s):  
Helena Kadlec ◽  
Iris Van Rooij ◽  
Valerie A. Gonzales
Keyword(s):  
Dynamic Stability

Control of Steam-Turbine Regulators at Transition to an Island State

2009 ◽  
Vol 25 (25) ◽  
pp. 73-76
Author(s):  
Georgi Georgiev
Keyword(s):  
Steam Turbine ◽  
Dynamic Stability ◽  
Easy Problem ◽  
Island State ◽  
On Line ◽  
State Regime ◽  
Turbine Speed ◽  
The Given ◽  
Operating Algorithm

Control of Steam-Turbine Regulators at Transition to an Island StateThe simple operating algorithm is presented for steam turbine regulators of type Simadin (Siemens) at emergency switching-off of the generator from system together with some, unknown in advance, load. The given situation is known as "a transition to an island state (regime)". Keeping of turbine speed and preservation of its rating value at a generator blackout when its own needs will be load only, is an easy problem. When the generator remains in its island it is necessary to solve "on-line" two additional problems: to reveal a situation "island" and to estimate the island load for translating a regulator on the new task and providing dynamic stability of transition. The algorithm was tried and entered successfully into practice on Varna TPP, CEZ GROUP (Prague), in 2008.

Dynamic stability of a free-free cylindrical shell under a follower force

AIAA Journal ◽  
2000 ◽  
Vol 38 ◽  
pp. 1070-1077
Author(s):  
Si-Hyoung Park ◽  
Ji-Hwan Kim
Keyword(s):  
Cylindrical Shell ◽  
Dynamic Stability ◽  
Follower Force
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