Anti-resonance Vibration Suppression Control in Full-closed Control System

2019 ◽  
Vol 139 (10) ◽  
pp. 847-853
Author(s):  
Yasufumi Yoshiura ◽  
Yusuke Asai ◽  
Yasuhiko Kaku
Keyword(s):  
Control System ◽  
Vibration Suppression ◽  
Resonance Vibration

scholarly journals Anti-resonance Vibration Suppression Control in Full-closed Control System

2020 ◽  
Vol 9 (3) ◽  
pp. 311-317
Author(s):  
Yasufumi Yoshiura ◽  
Yusuke Asai ◽  
Yasuhiko Kaku
Keyword(s):  
Control System ◽  
Vibration Suppression ◽  
Resonance Vibration

Simulation and Parameter Optimization for Vibration Control System of MLRS Launcher

2014 ◽  
Vol 668-669 ◽  
pp. 526-531
Author(s):  
Xian Zhao ◽  
De Qing Luo
Keyword(s):  
Control System ◽  
Control Mechanism ◽  
Vibration Suppression ◽  
Structural Parameters ◽  
Pulse Frequency ◽  
Structure Parameter ◽  
Pulse Control ◽  
Lateral Direction ◽  
Parameter Values ◽  
Rocket System

Vibration suppression of the launcher is an important way to improve the firing accuracy of Multiple Launch Rocket System (MLRS). In order to get a better control result from the course that pulse control mechanism generates pulses to restrain the vibration of MLRS launcher, this paper analyzed the process that pulse thruster control the vibration of launcher under the modulation of pulse width and pulse frequency (PWPF) modulator. And the simulation model of the control system is established through the SIMULINK software in MATLAB. Under repeated modifications of the structural parameters of PWPF modulator, the influence laws of these parameters are found out, and the best structure parameter values are obtained. The final simulation result shows that the vibration in the pitch and lateral direction is greatly reduced. It is a big help to improve the firing accuracy of MLRS.

scholarly journals Output Control of Three-Axis PMSG Wind Turbine Considering Torsional Vibration Using H Infinity Control

Energies ◽  
2020 ◽  
Vol 13 (13) ◽  
pp. 3474
Author(s):  
Kosuke Takahashi ◽  
Nyam Jargalsaikhan ◽  
Shriram Rangarajan ◽  
Ashraf Mohamed Hemeida ◽  
Hiroshi Takahashi ◽  
...  
Keyword(s):  
Control System ◽  
Wind Turbine ◽  
Wind Power ◽  
Torsional Vibration ◽  
Vibration Suppression ◽  
Current Control ◽  
Metal Fatigue ◽  
Power Generator ◽  
Term Operation ◽  
Wind Power Generator

Due to changes in wind, the torque obtained from the wind turbine always fluctuates. Here, the wind turbine and the rotor of the generator are connected by a shaft that is one elastic body, and each rotating body has different inertia. The difference in inertia between the wind turbine and the generator causes a torsion between the wind generator and the generator; metal fatigue and torsion can damage the shaft. Therefore, it is necessary to consider the axial torsional vibration suppression of a geared wind power generator using a permanent magnet synchronous generator (PMSG). In addition, errors in axis system parameters occur due to long-term operation of the generator, and it is important to estimate for accurate control. In this paper, we propose torque estimation using H ∞ observer and axial torsional vibration suppression control in a three inertia system. The H ∞ controller is introduced into the armature current control system (q-axis current control system) of the wind power generator. Even if parameter errors and high-frequency disturbances are included, the shaft torsional torque is estimated by the H ∞ observer that can perform robust estimation. Moreover, by eliminating the resonance point of the shaft system, vibration suppression of the shaft torsional torque is achieved. The results by the proposed method can suppress axial torsional vibration and show the effect better than the results using Proportional-Integral (PI) control.

Development of a New Passive-Active Magnetic Damper for Vibration Suppression

2005 ◽  
Vol 128 (3) ◽  
pp. 318-327 ◽  
Author(s):  
Henry A. Sodano ◽  
Daniel J. Inman ◽  
W. Keith Belvin
Keyword(s):  
Magnetic Field ◽  
Control System ◽  
Eddy Currents ◽  
Vibration Suppression ◽  
Internal Resistance ◽  
Viscous Force ◽  
Damping Force ◽  
Conductive Material ◽  
Damping Effect ◽  
Active Portion

Magnetic fields can be used to apply damping to a vibrating structure. Dampers of this type function through the eddy currents that are generated in a conductive material experiencing a time-changing magnetic field. The density of these currents is directly related to the velocity of the change in magnetic field. However, following the generation of these currents, the internal resistance of the conductor causes them to dissipate into heat. Because a portion of the moving conductor’s kinetic energy is used to generate the eddy currents, which are then dissipated, a damping effect occurs. This damping force can be described as a viscous force due to the dependence on the velocity of the conductor. In a previous study, a permanent magnet was fixed in a location such that the poling axis was perpendicular to the beam’s motion and the radial magnetic flux was used to passively suppress the beam’s vibration. Using this passive damping concept and the idea that the damping force is directly related to the velocity of the conductor, a new passive-active damping mechanism will be created. This new damper will function by allowing the position of the magnet to change relative to the beam and thus allow the net velocity between the two to be maximized and thus the damping force significantly increased. Using this concept, a model of both the passive and active portion of the system will be developed, allowing the beams response to be simulated. To verify the accuracy of this model, experiments will be performed that demonstrate both the accuracy of the model and the effectiveness of this passive-active control system for use in suppressing the transverse vibration of a structure.

Vibration Suppression of an Underactuated Dynamic System Using Virtual Actuators

2016 ◽  
Vol 138 (6) ◽  
Author(s):  
A. M. Khoshnood ◽  
I. Azad ◽  
S. M. Hasani
Keyword(s):  
Control System ◽  
Dynamic System ◽  
Attitude Control ◽  
Vibration Suppression ◽  
Nonlinear Dynamic Model ◽  
Attitude Control System ◽  
Suppression Technique ◽  
A New Technique ◽  
And Performance ◽  
The Stability

Sloshing is one of the critical problems in aerospace vehicles with liquid containers. Motion of the liquid in resonance situations can degrade the stability and performance of attitude control systems. Two important characteristics of this time varying phenomenon are sensorless and underactuated properties which lead to difficulty of attitude control system design. In this paper, a new technique based on soft sensor and virtual actuator is used to suppress the effects of fuel sloshing in an aerospace launch vehicle (ALV). For this purpose, a nonlinear dynamic model of the vehicle with mechanical model of the fuel sloshing is considered as a multibody dynamic system. The preliminary attitude control system of the vehicle is extended using the new vibration suppression technique and a numerical simulation of the nonlinear model is carried out. Results of the simulation show that the undesired effects of the fuel sloshing are effectively decreased using the proposed vibration suppression technique.

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