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IEEE/ASME International Conference on Advanced Intelligent Mechatronics (AIM)

作者： Xu, Tiancheng Wang, Huixing Li, Yancheng Leng, DengXin Xu, Hanou Shenzhen Upward Technol Co Ltd Dept Res & Dev Shenzhen 518000 Peoples R China Nanjing Univ Sci & Technol Sch Mech Engn Nanjing 210094 Peoples R China Univ Technol Sydney Sch Civil & Environm Engn Ultimo NSW 2007 Australia Ocean Univ China Engn Coll Qingdao Peoples R China Shenzhen Upward Technol Co Ltd Shenzhen 518000 Peoples R China

ISBN: (纸本)9781665476331

This paper presents comprehensive experimental exploration on control performance of magnetorheological (MR) suspension system under various road conditions. MR dampers with monotube structure are designed and installed on front and rear vehicle suspensions. The response time of MR damper force is experimentally determined. Meanwhile, a feasible inverse model is constructed to portray the behavior of the MR dampers based on data obtained from experimental testing with random displacement and current as inputs. An output feedback control strategy is proposed to reduce the vertical response of sprung and unsprung mass, as well as the roll and pitch angles. To be practical, the required feedback signals are relative velocity of MR dampers, the vertical velocity at vehicle mass center, and the angular velocity of roll and pitch which are convenient to collect by commercial sensors like displacement sensor and IMU. To verify the feasibility of the system, a passenger vehicle with four MR dampers suspension was tested on various road profiles. The experiment results indicate the better performance of ride comfort and body attitude of vehicle can be achieved by the proposed MR suspension system.

关键词： magnetorheological damper semi-active control algorithm output feedback road test vehicle ride comfort

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An adaptive control algorithm for smart base isolation systems based on seismic early warning system

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STRUCTURES 2021年 30卷 638-646页

作者： Mohebbi, Mohtasham Dadkhah, Hamed Univ Mohaghegh Ardabili Fac Engn Dept Civil Engn Ardebil Iran

The common control strategy of smart base isolation composed of a low-damping rubber bearing and a magnetorheological (MR) damper is to use MR damper in semi-active form. One drawback of this strategy is increasing the acceleration of isolated structure due to adding MR damper, especially under low-intensity earthquakes. This paper proposes a new adaptive-passive control approach for smart base isolation system. In this approach, MR damper performs in passive form while its behaviour is adjusted proportionally to intensity of the incoming earthquake which can be provided by a seismic early warning system (SEWS). For comparison purposes, hybrid control system has been also designed using the common control strategy in semi-active form. Because of the lack of high accuracy of SEWS in predicting the earthquake intensity, the performance of proposed control approach has been evaluated for an error of 20% in the estimated earthquake intensity. Evaluation of the performance of these control strategies under testing earthquake records shows that adaptive-passive control algorithm works better than semi-active control algorithm in controlling the seismic response of structure and the proposed control algorithm has effective performance under a wide range of earthquake intensities.

关键词： Adaptive-passive control algorithm semi-active control algorithm Smart base isolation system MR damper Seismic early warning system Earthquake intensity

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control algorithms for semi-active structural systems: do they really matter?

Control algorithms for semi-active structural systems: do th...

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3rd International Conference on Smart Materials, Structures and Systems

作者： Occhiuzzi, Antonio Ctr Direzionale Dipartimento Tecnol I-80143 Naples Italy

ISBN: (纸本)9783908158226

control algorithms for semi-active structural control system found in the scientific literature often rely on the choice of several parameters included in the control law. The present paper shows the preliminary conclusions of a study aiming to explain the weak dependency of the response reduction associated to semi-active control systems on the particular choice of the control algorithm adopted, provided that the relevant parameters of any control law be properly tuned.

关键词： semi-active control algorithm magnetorheological damper

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Structural vibration control of civil structures with squeeze mode smart damper;Experimental comparisons

Structural vibration control of civil structures with squeez...

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Smart Structures and Materials 2006 Conference

作者： Heo, Gwanghee Jeon, Joon-Ryong Lee, Giu Lee, WooSang Konyang Univ Dept Civil Engn Nonsan 320711 Chungnam South Korea

ISBN: (纸本)0819462276

This paper experiments on each of two control algorithms which are adapted into a unified control algorithm, in order to decide which is better for semi-active control of civil structures using a squeeze mode smart damper. These algorithms are Lyapunov algorithm and a clipped optimal algorithm, both of which are superior in efficiency and reliability to any existing semi-active control algorithms. Such adaptation makes it easier to develop a control algorithm because it accommodates both continuous and discrete time signals at the same time, and to analyze the control characteristics in the case of broadly distributed natural frequency by securing enlarged stable regions. In order to prove its validity, we performed vibration control tests using a prototype steel plate girder bridge. Since the model is a reduced one, we also scaled El Centro earthquake wave to the same scale as the reduced model bridge. Various performance indexes have been used to see which algorithm is most effective in control. Also, other experiments were performed to define the control characteristics which would enable us to see how all control conditions--displacement control, force control, and acceleration control--work with each control algorithm. Those experiments showed that each control algorithm works differently according to each different control condition. It is found that Lyapunov algorithm of the two is more effective for semi-active control in the unified control system. Therefore, it is necessary to design a control system according to structural conditions and circumstances.

关键词： clipped optimal algorithm squeeze mode smart damper Lyapunov algorithm semi-active control algorithm unified control algorithm

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Smart vibration control analysis of seismic response using MR dampers in the elevated highway bridge structures

Smart vibration control analysis of seismic response using M...

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Smart Structures and Materials 2005 Conference

作者： Yan, S Zhang, H Shenyang Jianzhu Univ Sch Civil Engn Shenyang Liaoning Peoples R China

ISBN: (纸本)0819457469

The magnetorheological (MR) damper is on of the smart controllers used widely in civil engineering structures. These kinds of dampers are applied in the paper in the elevated highway bridge (EHB) with rubber bearing support piers to mitigate damages of the bridge during the severe earthquake ground motion. The dynamic calculating model and equation of motion for the EHB system are set up theoretically and the LQR semi-active control algorithm of seismic response for the EHB system is developed to reduce effectively the responses of the structure. The non-linear calculation model of the piers that rigid degradation is considered and numerical simulative calculation are carried out by Matlab program. The number and location as well as the maximum control forces of the MR dampers, which are the most important parameters for the controlled system, are determined and the rubber bearing and connection forms of the damper play also important rule in the control efficiency. A real EHB structure that is located in Anshan city, Liaoning province in China is used as an example to be calculated under different earthquake records. The results of the calculation show that it is effective to reduce seismic responses of the EHB system by combining the rubber bearing isolation with semi-active MR control technique under the earthquake ground motion. The locations of MR dampers and structural parameters will influence seriously to the effects *** vibration control.

关键词： elevated highway bridge semi-active control algorithm MR damper seismic nonlinear analysis earthquake ground motion

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