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Hiramoto K.,Niigata University | Matsuoka T.,Meiji University | Sunakoda K.,Sanwa Tekki Corporation
Structural Control and Health Monitoring | Year: 2016

Summary A new semi-active control strategy that approximates a predicted control output of a reference active control is proposed. A variable parameter of a semi-active control device is selected at every time instant so that the predicted control output of the semi-active control system becomes close to the corresponding predicted control output of the reference active control as much as possible. Parameters of the reference active control law are optimized in the premise of the aforementioned 'output emulation' strategy so that the control performance of the semi-active control becomes good and the 'error' in the sense of achieved control performance between the reference active control and semi-active control systems becomes small. A pole placement method based on a linear matrix inequality (LMI) framework is adopted as the reference active control law. Parameters to determine the domain in the complex plane where the closed-loop poles are placed are searched so that control performance of the semi-active control system based on the output emulation approach is optimized. © Copyright 2015 John Wiley & Sons, Ltd. Source


Hiramoto K.,Niigata University | Matsuoka T.,Meiji University | Sunakoda K.,Sanwa Tekki Corporation
Structural Control and Health Monitoring | Year: 2014

SUMMARY Various semi-active control methods have been proposed for vibration control of civil structures. In contrast to active vibration control systems, all semi-active control systems are essentially asymptotically stable because of the stability of general structural systems with structural damping and the energy dissipative nature of the semi-active control itself. In this study, by utilizing the aforementioned property on the stability of semi-active control systems, a structural model for the semi-active control design and a model-based semi-active control law are simultaneously designed so that the control performance of the resulting semi-active control system becomes good. The model for the control system design is assumed to be a linear parameter varying model with adjustable structural design parameters. The semi-active control law is based on the one step ahead prediction of the structural response of the designed model for the control system design. A genetic algorithm is adopted to obtain design parameters in the model for the control system design and the semi-active control law. Those design parameters are optimized so that the closed-loop system with the detailed dynamic model that accurately approximates the dynamic behavior of the real structural system and the semi-active control law obtained with the model for the control system design. The effectiveness of the present approach is shown with a simulation study. Copyright © 2013 John Wiley & Sons, Ltd. Copyright © 2013 John Wiley & Sons, Ltd. Source


Hiramoto K.,Niigata University | Matsuoka T.,Meiji University | Sunakoda K.,Sanwa Tekki Corporation
Proceedings of the SICE Annual Conference | Year: 2013

As a method for semi-Active control of structural systems, the active-control-based method that emulates the control force of a targeted active control law by semi-Active control devices has been studied. In the active-control-based method, the semi-Active control devices are not necessarily able to generate the targeted active control force because of the dissipative nature of those devices. In this study, a new semi-Active control strategy that approximates the control output of the targeted active control is proposed. The variable parameter of the semi-Active control device is selected at every time instant so that the predicted control output of the semi-Active control system becomes close to the corresponding predicted control output of the targeted active control as much as possible. Parameters of the targeted active control law are optimized in the premise of the above "output emulation" strategy so that the control performance o f the semi-Active control becomes good and the "error" of the achieved control performance between the targeted active control and the semi-Active control becomes small. Source


Matsuoka T.,Meiji University | Sugita T.,Meiji University | Sunakoda K.,Sanwa Tekki Corporation
American Society of Mechanical Engineers, Pressure Vessels and Piping Division (Publication) PVP | Year: 2014

The authors propose a Magneto-Rheological (MR) fluid damper that utilizes multi pole electromagnets in order to control variable damping effect such as a semiactive damper. The damper consists of a piston, a cylinder, a by-pass pipe, 8 electromagnets, and MR fluid. The electromagnets are installed octagonal around the pipe. When each electromagnet can control both of the magnetic flux density and direction, resisting force can be switched by several types of magnetic field such as artificial orifice. The test damper is manufactured. Resisting force characteristics are measured by using a shaking actuator. Finally, dynamic performance of the damper is confirmed experimentally. Copyright © 2014 by ASME. Source


Shibuya Y.,Akita University | Nasuno H.,Shimizu Corporation | Sunakoda K.,Sanwa Tekki Corporation
ASME 2014 Conference on Smart Materials, Adaptive Structures and Intelligent Systems, SMASIS 2014 | Year: 2014

Magneto-rheological composites with magnetic particles are prepared. The magnetic particle is Fe-Si-B-Cr system and the average diameter is 10 m. Matrix of the composite is silicon gel. We characterized dynamic response of the material by shear test in magnetic field where intensities are 0 mT, 105 mT and 211 mT. The stiffness and damping capacity of the composite increase with increasing of the magnetic field. To understand mechanism of behavior of magneto-rheological composites, we make a model of the composite with periodical micro structure. The magneto- rheological composite undergoes magnetically induced internal stress field by applied magnetic field. The analysis model involved effect of the applied magnetic field as initial stress in the material. Particles and the magnetically induced stress make locally large strain field in the gel material. A large deformation analysis with the Ogden model using finite element method is made to demonstrate behavior of magneto-rheological composites. The simulation results are compared with experiment results and verified the effectiveness of the model. Copyright © 2014 by ASME. Source

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