Active/Passive Hybrid Control System for Compressor Surge Based on Fuzzy Logic

2014 ◽  
Vol 136 (9) ◽  
Author(s):  
Hanlin Sheng ◽  
Wei Huang ◽  
Tianhong Zhang ◽  
Xianghua Huang
Keyword(s):  
Fuzzy Logic ◽  
Control System ◽  
Active Control ◽  
Hybrid System ◽  
Passive Control ◽  
Hybrid Control ◽  
Control Mode ◽  
Compressor Surge ◽  
Surge Line ◽  
Hybrid Control System

A hybrid control system has been proposed for compressor surge, which combines the active method with the passive method. A bleed valve was selected as the actuator in the proposed system. As a submode of the hybrid system, a fuzzy logic based active controller was designed to extend the stability operating range of the compressor. Meanwhile, a surge avoidance controller was used as a backup-mode to improve the safety performance of the system. The simulation results showed that the compressor can operate steadily outside the surge line under active control mode and can be dragged back to inside the surge line by the passive control mode when the alternative fails. One advantage of the proposed control system is that it does not need a model of the compressor, and it works on any compression system. Passive surge control is a reliable and widely applied method in industrial compressors. The hybrid system makes the active control approach closer to the industrial implementation.

scholarly journals Review on vibration control in tall buildings: from the perspective of devices and applications

2020 ◽  
Author(s):  
BG Kavyashree ◽  
Shantharam Patil ◽  
Vidya S. Rao
Keyword(s):  
Control System ◽  
Active Control ◽  
Structural Control ◽  
Passive Control ◽  
Hybrid Control ◽  
Tall Buildings ◽  
Effective Control ◽  
Earthquake Load ◽  
History Of ◽  
External Loads

AbstractPermanent construction has evolved from the Palaeolithic age to today’s skyscrapers. Constructing the structure, which promises occupants safety, has become a concern because of the uncertainties in nature. Therefore in recent years, attention has been given to the development of structural protective devices that could take care of the external loads. Structural control against the wind and earthquake load has been seriously studied where the structure behaves differently for wind and earthquake load has been briefly discussed in this paper. Initially, paper discusses the history of the construction and the passive control system, which was used in structural control, is briefly discussed in this paper. Also, the implementation of active control has been discussed which was introduced later in the structural control for more effective control. But the limitations of the passive and active control system have introduced semi-active control and also the hybrid control strategy. The two mechanisms are put together in the semi-active and hybrid system to obtain all advantages of the algorithm along with overcoming their limitations. The review also briefs about stochastic vibrational control of the structure where randomness is considered in external loads, parameter of the system and also in the external devices which are implemented in the structural control. As construction sector is a complex system, big data analysis, a new field in structural control system is discussed and future scope is also mentioned.

Analysis of Vibration Control due to Strong Earthquakes

2010 ◽  
Vol 163-167 ◽  
pp. 4179-4184 ◽  
Author(s):  
He Len Wu
Keyword(s):  
Control System ◽  
Active Control ◽  
Base Isolation ◽  
Hybrid Control ◽  
Ground Motions ◽  
Isolation System ◽  
System A ◽  
Base Isolation System ◽  
Active Control System ◽  
Hybrid Control System

The paper proposes an aseismic hybrid control system to control the response of structures subjected to large ground motions caused by large magnitude earthquakes. The proposed hybrid control system consists of a base isolation system (laminated rubber bearings) connected to an active control system (a tuned mass damper and an actuator). The base isolation system is used to decouple the horizontal ground motions from the structure, whereas the active control system is used to protect the safety and integrity of the base isolation system. A 5-story benchmark building model is developed to study the effectiveness of the hybrid control system against different ground motions. It was found from the numerical results that rubber bearing system alone shows good performance and resists ground motion due to Hachinohe 1968, Kobe 1995, and Northridge 1994 earthquakes, but is somewhat unable to protect the model against El-Centro 1940 earthquake. After the installation of an active control system onto the rubber-isolated model, further improvements to earthquake resistance against these four earthquakes were observed, especially against the El-Centro earthquake. The merit of the hybrid control system lies in its capability to protect against different ground motions, with varying intensity and frequency content.

scholarly journals Hybrid Electromagnetic Shunt Damper for Vibration Control

2020 ◽  
Vol 143 (2) ◽  
Author(s):  
Ahmad Paknejad ◽  
Guoying Zhao ◽  
Simon Chesné ◽  
Arnaud Deraemaeker ◽  
Christophe Collette
Keyword(s):  
Control System ◽  
Power Consumption ◽  
Control Systems ◽  
Active Control ◽  
Hybrid Control ◽  
Current Source ◽  
Voltage Source ◽  
Control Law ◽  
Electromagnetic Devices ◽  
Hybrid Control System

Abstract It has been shown that shunting electromagnetic devices with electrical networks can be used to damp vibrations. These absorbers have however limitations that restrict the control performance, i.e., the total damping of the system and robustness versus parameter variations. On the other hand, the electromagnetic devices are widely used in active control techniques as an actuator. The major difficulty that arises in practical implementation of these techniques is the power consumption required for conditioners and control units. In this study, robust hybrid control system is designed to combine the passive electromagnetic shunt damper with an active control in order to improve the performance with low power consumption. Two different active control laws, based on an active voltage source and an active current source, are proposed and compared. The control law of the active voltage source is the direct velocity feedback. However, the control law of the active current source is a revisited direct velocity feedback. The method of maximum damping, i.e., maximizing the exponential time-decay rate of the response subjected to the external impulse forcing function, is employed to optimize the parameters of the passive and the hybrid control systems. The advantage of using the hybrid control configuration in comparison with purely active control system is also investigated in terms of the power consumption. Besides these assets, it is demonstrated that the hybrid control system can tolerate a much higher level of uncertainty than the purely passive control systems.

On Hybrid Control System Methods for Traffic and Transportation System

2012 ◽  
Vol 253-255 ◽  
pp. 1438-1442
Author(s):  
Xue Lei Meng ◽  
Li Min Jia ◽  
Yong Qin ◽  
Jie Xu
Keyword(s):  
Control System ◽  
Hybrid Systems ◽  
Hybrid System ◽  
Hybrid Control ◽  
Transportation System ◽  
The Future ◽  
Discrete Part ◽  
Hybrid Control System

Hybrid system is a whole system in which the discrete part and continual part interact each other. It discusses the definition and the character of the hybrid systems. Then the hybrid characters of the traffic and transportation system is described. It sums up the hybrid system methods of studying transportation system, points out the shortcomings of the current studying methods and forecasts the future studying fields and methods.

Hybrid control system design using a fuzzy logic interface

1998 ◽  
Vol 17 (3) ◽  
pp. 401-419 ◽  
Author(s):  
Rafael Fierro ◽  
Frank L. Lewis ◽  
Kai Liu
Keyword(s):  
Fuzzy Logic ◽  
Control System ◽  
System Design ◽  
Hybrid Control ◽  
Control System Design ◽  
Hybrid Control System

SIX DEGREE-OF-FREEDOM MICROVIBRATION HYBRID CONTROL SYSTEM FOR HIGH TECHNOLOGY FACILITIES

2009 ◽  
Vol 09 (03) ◽  
pp. 437-460 ◽  
Author(s):  
YONG WANG ◽  
HONG-JUN LIU
Keyword(s):  
Control System ◽  
Ground Motion ◽  
Passive Control ◽  
Hybrid Control ◽  
High Technology ◽  
Control Performance ◽  
Wide Range ◽  
Magnetostrictive Actuators ◽  
The Absolute ◽  
Hybrid Control System

With the view to achieving a more perfect microvibration-free working environment for high technology equipment such as semiconductors and optical microscopes, the authors investigate the use of a 6-DOF microvibration hybrid control system to mitigate two types of vibration (ground motion and direct disturbance). This hybrid control system comprises a table, five air springs as passive mounts and eight magnetostrictive actuators as active control actuators. To facilitate the feedback control and performance evaluation of the hybrid control system based on the one-third octave band spectra with the absolute velocity being the target, the analytical model of a hybrid control system that incorporates magnetostrictive actuators is established in the absolute coordinates. The control performance of the platform with a hybrid control system is assessed by comparing with the case of the platform with a passive control system. Simulation results indicate that the proposed platform with hybrid control system for microvibration is superior to that with passive control system because of its higher control performance against ground motion and direct disturbance for a wide range of frequencies.

Research on hybrid control system of quadrotor UAV

2013 ◽  
Vol 33 (3) ◽  
pp. 858-861 ◽  
Author(s):  
Guoqing XIA ◽  
Yuefeng LIAO ◽  
Lu WANG
Keyword(s):  
Control System ◽  
Hybrid Control ◽  
Quadrotor Uav ◽  
Hybrid Control System
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