Optimal placement of actuators for active vibration control of seismic excited tall buildings using a multiple start guided neighbourhood search (MSGNS) algorithm

2008 ◽  
Vol 311 (1-2) ◽  
pp. 133-159 ◽  
Author(s):  
A. Rama Mohan Rao ◽  
K. Sivasubramanian
Keyword(s):  
Vibration Control ◽  
Active Vibration Control ◽  
Tall Buildings ◽  
Optimal Placement ◽  
Neighbourhood Search ◽  
Active Vibration

Optimal Placement of Piezoelectric Sensors and Actuators for Controlled Flexible Linkage Mechanisms

2005 ◽  
Vol 128 (2) ◽  
pp. 256-260 ◽  
Author(s):  
Xianmin Zhang ◽  
Arthur G. Erdman
Keyword(s):  
Vibration Control ◽  
Simulation Analysis ◽  
Active Vibration Control ◽  
Optimal Placement ◽  
Control Effect ◽  
Sensors And Actuators ◽  
Piezoelectric Sensors And Actuators ◽  
Active Vibration ◽  
Flexible Mechanism ◽  
Flexible Linkage

The optimal placement of sensors and actuators in active vibration control of flexible linkage mechanisms is studied. First, the vibration control model of the flexible mechanism is introduced. Second, based on the concept of the controllability and the observability of the controlled subsystem and the residual subsystem, the optimal model is developed aiming at the maximization of the controllability and the observability of the controlled modes and minimization of those of the residual modes. Finally, a numerical example is presented, which shows that the proposed method is feasible. Simulation analysis shows that to achieve the same control effect, the control system is easier to realize if the sensors and actuators are located in the optimal positions.

Active Vibration Control of a Triple Flexible Structures Combined With Actuators

1995 ◽  
Author(s):  
Kazuto Seto ◽  
Yoshihiro Toba ◽  
Fumio Doi
Keyword(s):  
Vibration Control ◽  
Large Scale ◽  
Active Vibration Control ◽  
Flexible Structures ◽  
Low Frequency ◽  
Tall Buildings ◽  
Control Force ◽  
Active Vibration ◽  
Strong Winds ◽  
Lq Control

Abstract In order to realize living comfort of tall buildings by reducing the vibration of higher floors by strong winds, this paper proposes a new method of vibration control for flexible structures with a large scale. The higher a tall building the lower its natural frequency. Since obtaining sufficient force to control the lower frequency vibrations of tall buildings is a difficult task, controlling the vibration of ultra-tall buildings using active dynamic absorbers is nearly impossible. This problem can be overcome by placing actuators between a pair of two or three ultra-tall buildings and using the vibrational force of each building to offset the vibrational movement of its paired mate. Therefore, it is able to obtain enough control force under the low frequency when the proposed method is used. In this paper, a reduced-order model expressed by 2DOF system under taking into consideration for preventing spillover instability is applied to control each flexible structure. The LQ control theory is applied to the design of such a control system. The effectiveness of this method is demonstrated theoretically as well as experimentally.

Optimal Research of Actuator Placement for Piezoelectric Smart Structure

2009 ◽  
Vol 419-420 ◽  
pp. 173-176
Author(s):  
Wei Yuan Wang ◽  
Kai Xue ◽  
Dong Yan Shi
Keyword(s):  
Vibration Control ◽  
Control Method ◽  
Active Vibration Control ◽  
Element Model ◽  
Smart Structure ◽  
Optimal Placement ◽  
Optimal Method ◽  
Modal Damping ◽  
Active Vibration ◽  
Modal Space

The purpose of this paper is to investigate the optimal placement of piezoelectric actuator for active vibration control of smart structure. The structures can be described in the modal space based on the independent modal space control method and dynamic equations derived from finite element model. The modal damping ratios are derived from modal equations and an optimal target is given by maximizing the modal damping ratios. Accumulation method is adopted to the optimization calculation. Simulations are carried out for active vibration control of a conical shell with distributed piezoelectric actuators. Control effects proved the validity of the optimal method above by compared with the non-optimal results. The optimal method in this paper gives a useful guide for quantity optimization of actuators to piezoelectric structures.

Special Issue on Active Vibration Control

1994 ◽  
Vol 6 (3) ◽  
pp. 183-183
Author(s):  
Kazuto Seto ◽  
Keyword(s):  
Control Theory ◽  
Vibration Control ◽  
Active Vibration Control ◽  
Flexible Structures ◽  
Tall Buildings ◽  
Magnetic Bearing ◽  
Control Problems ◽  
Control Technology ◽  
Special Issue ◽  
Active Vibration

Mechanical devices easily cause vibration because they are constructed with structural materials that have little internal damping. For this reason, vibration control has long been a big problem for the development of excellent machines. Now, sophisticated vibration control technology is becoming indispensable for satisfying various demands, related to the higher performance, reduced weight, energy savings, etc. of machines, which have become increasingly stronger in recent years. In particular, a large number of problems in which active vibration control holds the key are occurring in the most advanced fields of engineering. As can be seen in various examples of super-tall buildings such as the Yokohama Landmark Tower and Tokyo Gas Building, which have recently been completed at various locations, the construction of new structures like super-tall buildings has become possible by the support of this technology. On the other hand, with the further progress in mechatronics, it is now common sense that a control system is incorporated in any of today's machines. However, this has caused a new problem related to vibration. The problem is that energy injected for controlling position or motion excites vibration characteristics neglected from the control object and induces violent vibration in the machine. To be more specific, a flexible rotor controlled by a magnetic bearing is; capable of rotating at ultra-high speeds, but its flexible vibration must be controlled in order to solve a multiple 'number of critical speed passage problems. At such a time, higher-order vibration modes neglected from the object of control may cause unstable vibration. This is a new problem called spillover instability. It is expected in the future that an increasing number of such problems related to the simultaneous control of motion and vibration will arise in mechatronics equipment. Up to now, for the control of vibration, passive vibration controlling devices which do not require the injection of energy from outside have often been used. However, with the recent demand for sophisticated vibration control technology as described above, active vibration control methods using sensors, actuators, and controllers have suddenly attracted attention. In the background of the realization of such vibration control methods is the fact that modern control theory, which was considered at the outset to be difficult to handle and hard to put immediately into practical use, and the subsequently developed robust control theory have become easily usable as supported by the following developments: * Development of control system design supporting software as represented by MATLAB and SIMULINK. * Progress in hardware with improvements in computers' computational speeds and with the appearance of DSPs. * Progress in electromagnetic force utilization technology made possible by the development of new materials such as high-performance magnets. * Advancement of vibration visualization technology for control objects based on the development of theoretical and experimental vibration analysis methods. * Advances in accurate control modelling methods. In particular, although these control theories are difficult to make use of unless accurate models of control objects are created, this difficulty has been solved due to the advances in the methods for the optimum placement of sensors and actuators based on experimental modal analysis and also because of the progress in the modeling methods. In this way, these theories are now about to contribute substantially to the development of vibration control technology, and there is even a view that vibration control is being act ively utilized as a splendid place for the testing of new control theories. Thus, in vibration control, vibration analysis and control theory are beginning to develop in a balanced operation like two wheels of a vehicle. Against this background, it has been decided to feature active vibration control in this issue and the next. This issue consists of two explanatory articles on examples of active vibration control and magnetic bearing control problems, eight articles mainly dealing with the active vibration control problems related to flexible structures, two technical reports on the vibration control of super-tall buildings and main towers of large bridges, and an introduction to the research laboratory in Japan where the concept of the vibration control of super-tall buildings was first proposed and realized. At the time when weight reduction is being sought from every field, the slimming and flexibility of structures as well as their resulting vibration control problems cannot be avoided. From this point of view, this special issue has been compiled centering on articles dealing with vibration control problems for flexible structures and their concrete structures. This issue was edited by Seto of Nihon University. Kazuo Yoshida of Keio University will be in charge of the next issue. The editor is most pleased if this special issue draws attention of its readers.

Optimal placement and active vibration control for piezoelectric smart flexible cantilever plate

2007 ◽  
Vol 301 (3-5) ◽  
pp. 521-543 ◽  
Author(s):  
Zhi-cheng Qiu ◽  
Xian-min Zhang ◽  
Hong-xin Wu ◽  
Hong-hua Zhang
Keyword(s):  
Vibration Control ◽  
Active Vibration Control ◽  
Optimal Placement ◽  
Cantilever Plate ◽  
Active Vibration

Analysis and implementation of MIMO FULMS algorithm for active vibration control

2011 ◽  
Vol 34 (7) ◽  
pp. 815-828 ◽  
Author(s):  
Xiaojin Zhu ◽  
Zhiyuan Gao ◽  
Quanzhen Huang ◽  
Shouwei Gao ◽  
Enyu Jiang
Keyword(s):  
Vibration Control ◽  
Lead Zirconate Titanate ◽  
Vibration Suppression ◽  
Active Vibration Control ◽  
Reference Signal ◽  
Optimal Placement ◽  
Mean Square ◽  
Least Mean Square ◽  
Active Vibration ◽  
Simulation Results

This correspondence focuses on the analysis and implementation of multi-input multi-output (MIMO) filtered-u least mean square (FULMS) algorithm for active vibration suppression of a cantilever smart beam with surface bonded lead zirconate titanate patches. By analysing a single-input single-output FULMS algorithm, the MIMO FULMS controller structure is given. Then an active vibration control experimental platform is established, with optimal placement of the actuators and sensors based on the maximal modal force rule. Simulation contrast analysis of FULMS algorithm and the most famous filtered-x least mean square (FXLMS) algorithm is performed while the reference signal is extracted from the exciter as well as directly from the controlled structure. Simulation results show that if the feedback information reflects the reference signal collected by the reference transducers, the FXLMS controller could hardly suppress the vibration while the FULMS controller is still effective. Then the actual control experiment is performed, and the result confirms the simulation results. The designed MIMO FULMS vibration controller has a good control performance, suppressing the vibration significantly with rapid convergence.

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