Analysis and Adaptive Active Control of Friction-induced Limit Cycle

2011 ◽  
Vol 47 (11) ◽  
pp. 44
Author(s):  
Yongfu WANG
Keyword(s):  
Limit Cycle ◽  
Active Control ◽  
Active Control Of Friction

DYNAMICS AND ACTIVE CONTROL OF MOTION OF A DRIVEN MULTI-LIMIT-CYCLE VAN DER POL OSCILLATOR

2007 ◽  
Vol 17 (04) ◽  
pp. 1343-1354 ◽  
Author(s):  
R. YAMAPI ◽  
B. R. NANA NBENDJO ◽  
H. G. ENJIEU KADJI
Keyword(s):  
Limit Cycle ◽  
Active Control ◽  
Coupling Parameter ◽  
Van Der Pol Oscillator ◽  
External Excitation ◽  
Van Der Pol ◽  
Chaotic Vibrations ◽  
Van Der Pol Model ◽  
Nonautonomous Case ◽  
Selection Of

This paper deals with the dynamics and active control of a driven multi-limit-cycle Van der Pol oscillator. The amplitude of the oscillatory states both in the autonomous and nonautonomous case are derived. The interaction between the amplitudes of the external excitation and the limit-cycles are also analyzed. The domain of the admissible values on the amplitude for the external excitation is found. The effects of the control parameter on the behavior of a driven multi-limit-cycle Van der Pol model are analyzed and it appears that with the appropriate selection of the coupling parameter, the quenching of chaotic vibrations takes place.

LIMIT CYCLE OSCILLATION PREDICTION AND CONTROL DESIGN METHOD FOR AEROELASTIC SYSTEM BASED ON NEW NONLINEAR REDUCED ORDER MODEL

2011 ◽  
Vol 08 (01) ◽  
pp. 77-90 ◽  
Author(s):  
GANG CHEN ◽  
YUE-MING LI ◽  
GUI-RONG YAN
Keyword(s):  
Limit Cycle ◽  
Active Control ◽  
Reduced Order Model ◽  
Nonlinear Flow ◽  
Limit Cycle Oscillation ◽  
Control Law ◽  
Order Model ◽  
Reduced Order ◽  
Large Perturbation ◽  
Cycle Oscillation

When the amplitude of the oscillation of the unsteady flow is large or there is large perturbation relative to the mean background flow, the traditional proper orthogonal decomposition/reduced order model (POD/ROM) based on linearized time or frequency domain small disturbance solvers cannot capture the main nonlinear features well such as limit cycle oscillation (LCO), which is very dangerous for the structure. Therefore, the traditional linear ROMs are not good enough for limit cycles prediction and active control law design. A new nonlinear ROM based on dynamically nonlinear flow equation NPOD/ROM was investigated. The nonlinear second-order snapshot equation in time domain for POD basis construction is obtained from the Taylor series expansion of the flow solver. The simulation results indicate that the NPOD/ROM can capture LCO very well and is also very convenient for active control law design, while the traditional POD/ROM lose effectiveness.

Nonlinear Control Methods for High Energy Limit Cycle Oscillations

1999 ◽  
Author(s):  
Thomas Strganac ◽  
John Junkins ◽  
J. Ko ◽  
Andrew J. Kurdila
Keyword(s):  
Nonlinear Control ◽  
Limit Cycle ◽  
Active Control ◽  
High Performance ◽  
High Energy ◽  
Limit Cycle Oscillation ◽  
Limit Cycle Oscillations ◽  
Cycle Oscillation ◽  
The Stability ◽  
Flight Regimes

Abstract Limit cycle oscillations, as they manifest in high performance fighter aircraft, remain an area of scrutiny by the aerospace industry and military. Tools for the simulation and prediction of the onset for limit cycle oscillations have matured significantly over the years. Suprisingly, less progress has been made in the derivation of active control methodologies for these inherently nonlinear dynamic phenomena. Even in the cases where it is known that limit cycle oscillation may be observed in particular flight regimes, and active control methodologies are employed to attenuate response, there are very few analytical results that study the stability of the closed loop system. In part, this may be attributed to the difficulty in characterizing the nature of the contributing nonlinear structural and nonlinear aerodynamic interactions that account for the motion. This paper reviews recent progress made by the authors in the derivation, development and implementation of nonlinear control methodologies for a class of low speed flutter problems. Both analytical and experimental results are summarized. Directions for future study, and in particular technical barriers that must be overcome, are summarized in the paper.

SEMI-ACTIVE CONTROL OF FRICTION DAMPERS

1997 ◽  
Vol 202 (2) ◽  
pp. 203-218 ◽  
Author(s):  
P. Dupont ◽  
P. Kasturi ◽  
A. Stokes
Keyword(s):  
Active Control ◽  
Friction Dampers ◽  
Active Control Of Friction

Stiff and soft active control of friction by vibrations and their energy efficiency

2018 ◽  
Vol 82 (4) ◽  
pp. 331-339 ◽  
Author(s):  
J. Benad ◽  
M. Popov ◽  
K. Nakano ◽  
V. L. Popov
Keyword(s):  
Energy Efficiency ◽  
Active Control ◽  
Active Control Of Friction

ACTIVE CONTROL OF FRICTION-DRIVEN OSCILLATIONS

1996 ◽  
Vol 193 (1) ◽  
pp. 417-426 ◽  
Author(s):  
Maria A. Heckl ◽  
I.D. Abrahams
Keyword(s):  
Active Control ◽  
Active Control Of Friction

scholarly journals Active control of friction by transverse oscillations

Friction ◽  
2018 ◽  
Vol 7 (1) ◽  
pp. 74-85 ◽  
Author(s):  
J. Benad ◽  
K. Nakano ◽  
V. L. Popov ◽  
M. Popov
Keyword(s):  
Active Control ◽  
Active Control Of Friction ◽  
Transverse Oscillations
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