scholarly journals The switching control method for the nonlinear response of seismic surface based on the local T-S model

2020 ◽  
Vol 24 (3) ◽  
pp. 327-333
Author(s):  
Yudong Jiang ◽  
Jinming Luo ◽  
Hojatallah Azarkhosh ◽  
Erjun Wu
Keyword(s):  
Nonlinear Response ◽  
Control Method ◽  
Time History ◽  
Switching Control ◽  
Single Step ◽  
Response Analysis ◽  
Control Force ◽  
Control Effect ◽  
Viscoelastic Damper ◽  
S Model

Based on the local T-S model, the switching control method for the nonlinear response of the seismic surface is studied, and the stiffness matrix of the composite interlayer element of viscoelastic damper and herringbone support is derived. The high-order single step ß method is applied to the nonlinear seismic response analysis and the instantaneous optimal active switching control. The local T-S model and controller are designed, and the approach and control of global nonlinear responses are realized through the multi-model switching control. The results show that the proposed method can accurately reflect the reduction of seismic ground load and the switching control of the main structure when the viscoelastic damper is installed. The switching control effect of the maximum spatial displacement becomes more and more obvious with the change of time history, and the control effect of all layers applying the switching control force is the most significant. Whether the controller is disturbed or not, it is always good and stable performance.

Elastic-Plastic Time History Analysis of MR Damping Structure Based on LQG Algorithm

2016 ◽  
Vol 858 ◽  
pp. 145-150
Author(s):  
Yu Liang Zhao ◽  
Zhao Dong Xu
Keyword(s):  
Optimal Control ◽  
Time History ◽  
Mr Damper ◽  
Time History Analysis ◽  
Control Force ◽  
Control Effect ◽  
Damping Force ◽  
Optimal Control Strategy ◽  
Elastic Plastic ◽  
History Analysis

This paper discussed an elastic-plastic time-history analysis on a structure with MR dampers based on member model, in which the elastoplastic member of the structure is assumed to be single component model and simulated by threefold line stiffness retrograde model. In order to obtain better control effect, Linear Quadratic Gaussian (LQG) control algorithm is used to calculate the optimal control force, and Hrovat boundary optimal control strategy is used to describe the adjustable damping force range of MR damper. The effectiveness of the MR damper based on LQG algorithm to control the response of the structure was investigated. The results from numerical simulations demonstrate that LQG algorithm can effectively improve the response of the structure against seismic excitations only with acceleration feedback.

The Response Analysis and Vibration Control of Flexible Arms With Two Nonlinear Factors

2021 ◽  
Vol 13 (01) ◽  
pp. 2150005
Author(s):  
Guoliang Ma ◽  
Minglong Xu ◽  
Liqun Chen
Keyword(s):  
Dynamic Response ◽  
Vibration Control ◽  
Control Method ◽  
Dead Zone ◽  
Response Analysis ◽  
Beam Model ◽  
Control Effect ◽  
Vibration Equation ◽  
The Dead ◽  
Flexible Arms

The space flexible arm has the characteristics of large flexibility and size, and external excitation will cause harmful vibration. In this paper, the dynamic response of flexible arms is analyzed, and the vibration control is studied when nonlinear factors are considered. First, the vibration equation is established according to the Hamilton’s principle, and the generalized force is derived by using rod model and beam model, respectively. Then the Runge–Kutta method is used to solve the vibration equation, and the dynamic response is obtained. Finally, the PD and fuzzy control simulations of three arms are established, and the dead zone and saturation nonlinearities are applied in the programs. The numerical results show that the external force causes significant response, and the vibration control method is effective. Besides, in order to achieve vibration control effect, it is necessary to reduce the dead zone nonlinear range.

Vibration and Motion Control of Flexible Structures by Hybrid Dynamic Absorber(Influence of Vibration System with Nonlinear Element)

1994 ◽  
Vol 6 (3) ◽  
pp. 230-236
Author(s):  
Shinji Mitsuta ◽  
◽  
Kazuto Seto ◽  
Hiroyuki Ito ◽  
Akio Nagamatsu ◽  
...  
Keyword(s):  
Vibration Control ◽  
Motion Control ◽  
Control Method ◽  
Flexible Structures ◽  
Sine Wave ◽  
Flexible Structure ◽  
Control Force ◽  
Control Effect ◽  
Dynamic Absorber ◽  
Servo Controller

Recently, the necessity for making machines weighing less and operating at high speeds has increased. This paper is concerned with vibration and motion control by a control system which combines a servo controller and a hybrid dynamic absorber. In our method, vibration control and motion control are designed independently. First, the dynamics of a tower structure and a servo motor are modeled. Then, it is shown experimentally that although vibration control by the servo controller alone causes instability due to nonlinear elements such as friction or rattle, the hybrid dynamic absorber does not easily cause this sort of instability. On the comparison of vibration control effect and control force, the hybrid dynamic absorber requires less force. Finally, to know the effect of the new method, we evaluated the motions (triangular wave and sine wave) of the flexible structure. The effectiveness of this vibration and motion control method for the flexible structure was demonstrated by simulations and experiments.

Assessment of seismic performance of an isolated structure equipped with a friction damper with coupling mechanism and an oil damper

2020 ◽  
pp. 136943322098165
Author(s):  
Shuang Zou ◽  
Heisha Wenliuhan ◽  
Norio Inoue
Keyword(s):  
Seismic Response ◽  
Time History ◽  
Coupling Mechanism ◽  
Control Force ◽  
Friction Damper ◽  
Analysis Model ◽  
Control Effect ◽  
Maximum Displacement ◽  
Isolation System ◽  
Isolation Layer

In this study, a friction damper with a coupling mechanism (FDC) and an oil damper were added to the isolation layer of an isolated structure. Using the Kelvin collision analysis model, a time history analysis was performed by considering a possible impact in the isolation layer. Based on a comparative analysis of the seismic control effect, the following conclusions can be drawn. The combined isolation system proposed in this study gradually increases the attenuation performance of the isolation layer according to the magnitude of the earthquake by taking complete advantage of the FDC and oil damper and satisfies different performance requirements of the isolation layer of different magnitudes of earthquakes. In addition to the same control effect as the combined isolation system for seismic fortification intensity earthquakes, the best control effect can be achieved using a small control force for frequent earthquakes. Overall, the control effect on the acceleration of structural seismic response is pronounced. In the case of a rare earthquake, for not amplifying the seismic response acceleration of isolated structure, the maximum displacement of the isolation layer is controlled within the reserved safety range to avoid collision and damage between the isolation layer and surrounding maintenance structure.

Chaotic Vibration and Comfort Analysis of Nonlinear Half-Vehicle Mode Excited by Consecutive Speed-Control Humps

2015 ◽  
Vol 27 (5) ◽  
pp. 513-519 ◽  
Author(s):  
Zhiyong Yang ◽  
◽  
Shan Liang ◽  
Qin Zhu ◽  
Yongsheng Sun ◽  
...  
Keyword(s):  
Feedback Control ◽  
Ride Comfort ◽  
Control Method ◽  
Time History ◽  
Speed Control ◽  
Feedback Gain ◽  
Vehicle Model ◽  
Control Effect ◽  
Characteristic Analysis ◽  
Chaotic Vibration

<div class=""abs_img""> <img src=""[disp_template_path]/JRM/abst-image/00270005/07.jpg"" width=""300"" /> Consecutive speed-control humps road</div> Complicated dynamic behavior will happen while nonlinear four degree-of-freedom (DOF) semi-vehicle model is under irregular road excitation. The complex nonlinear vibration influences the ride comfort and safety. In this paper, the study is aimed at analyzing the chaotic vibration and comfort analysis of a vehicle passing the consecutive speed control humps (SCHs). A four-DOF half-vehicle model and combined sine-trapezoidal wave of variable frequency are applied. Occurrence of chaotic vibration is analyzed by bifurcation diagram, time history, Poincarée map. The numerical simulation results show that chaotic vibration phenomenon possibly appears as vehicles are driven on consecutive SCHs. In addition, the exact range of vehicle speed that results in chaotic vibration is derived. Further studies indicate that the influence of quasi-periodic motion state to vehicle on driving comfort is the biggest. This paper uses direct variable feedback control method to control chaotic vibration, and analyzes the control effect from the feedback gain control effect and the delay of the feedback control. The results will help dynamic characteristic analysis of vehicles and the design of the continuous speed bumps. </span>

The Spatial Intelligent Structural Active Control Experimental Research

2013 ◽  
Vol 336-338 ◽  
pp. 551-555
Author(s):  
Qian Ying Ma ◽  
She Liang Wang ◽  
Jun Qiang Zhu ◽  
Er Gang Xiong
Keyword(s):  
Active Control ◽  
Control Method ◽  
Space Structure ◽  
Modal Control ◽  
Control Force ◽  
Real Time Control ◽  
Control Effect ◽  
System Equation ◽  
Time Control ◽  
Modal Coordinates

Active control in the application has more and more research, the independent modal space control method is transform the system equation into modal coordinates, then obtain the internal decoupling equations express by modal coordinates, and based on control algorithm calculate the modal control force, which achieve real-time control effect. The control calculation method is simple and efficient to meet the needs of active control. The paper introduce modal control theory and implement methods, design and manufacture the piezoelectric driving lever based on the working principle of the piezoelectric pile, then through the test, give the voltage-driving force relationship, which is linear. An active control experiment on a three-layer intelligence space structure had been done, it can be seen that through the active control, the corresponding modal displacement and acceleration of the structures control are a lot of inhibition; at the same time, through spectral analysis, it can be seen the structured modal damping coefficient corresponding to varying degrees have been improved.

Seismic Response Analysis on RC Frame Strengthened with Viscoelastic Damper

2013 ◽  
Vol 275-277 ◽  
pp. 1311-1314
Author(s):  
Jian Ping He ◽  
Ya Li Wang ◽  
Yong Liu
Keyword(s):  
Seismic Response ◽  
Time History ◽  
Seismic Energy ◽  
Earthquake Response ◽  
Response Analysis ◽  
Rc Frame ◽  
Seismic Response Analysis ◽  
Viscoelastic Damper ◽  
History Analysis ◽  
Different Parts

In this paper,time-history analysis comparison of different parts of the displacement on eight floor three span Frame Strengthened with viscoelastic damper under the action of EI Centro earthquake wave .The results indicate that setting viscoelastic damper Strengthened structure can well inhibition Seismic response function, reducing the earthquake response of the structure,decreasing amplitude are relatively obvious, achieving a better seismic condition, meeting the needs of the standard, it is a kind of performance very good seismic energy dissipation strengthening methods.

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