Design of a 20,000 pound variable stiffness actuator for structural vibration attenuation
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In this paper, the design of an actuator capable of protecting a full-scale structure from severe load conditions is described, which includes a cylinder filled with pressurized nitrogen and uses commercially available components.Abstract:
This paper describes the design of a novel actuator capable of protecting a full scale structure from severe load conditions. The design includes a cylinder filled with pressurized nitrogen and uses commercially available components. We demonstrate that the actuator behaves like a spring with an adjustable unstretched length, and that the effective spring stiffness can be changed easily by changing the initial cylinder pressure. In order to test the actuator on a full scale structure, an effective spring constant of approximately 10,000 pounds/inch was required over a two inch stroke. Because of the spring-like behavior, rather than damper-like behavior, the actuator does not transmit high forces to a vibrating structure like linear viscous dampers do when velocities are high. We analyze features of critical importance to the design of the actuator such as the cylinder dimensions, operating pressure, and valve selection. We then investigate the performance using a novel experimental apparatus that mimics the dynamics of a single story building, but has 1/400 the weight.read more
Citations
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Simultaneous Optimal Design of the Lyapunov-Based Semi-Active Control and the Semi-Active Vibration Control Device: Inverse Lyapunov Approach
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References
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Fluid Mechanics with Engineering Applications
TL;DR: Properties of fluids fluid statics basis of fluid flow energy considerations in steady flow momentum and forces in fluid flow similitude and dimensional analysis steady incompressible flow in pressure conduits forces on immersed bodies steady flow in open channels fluid measurements unsteady-flow problems steady flow of compressible fluids idea/flow maths hydraulic machinary - pumps hydraulic machinery - turbines
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Seismic Response Reduction Using Magnetorheological Dampers
TL;DR: In this article, a clipped-optimal control strategy for controlling magnetorheological dampers to reduce structural responses due to seismic loads is presented, employing a newly developed model that accurately portrays the salient characteristics of the MR dampers.
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Modeling, identification, and control of a pneumatically actuated, force controllable robot
James E. Bobrow,B. W. McDonell +1 more
TL;DR: It is shown with theory and experiments that pneumatic actuators can rival the performance of more common electric actuators and be controlled without the need for an expensive force/torque sensor usually required by electric motors driven systems.
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A Novel Semi-Active Multi-Modal Vibration Control Law for a Piezoceramic Actuator
TL;DR: In this article, a semi-active energy rate multi-modal vibration control technique is developed for a piezoceramic actuator coupled to a switching resistor/inductor shunt.
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A Comparative Study and Analysis of Semi-Active Vibration-Control Systems
TL;DR: Semi-active (SA) vibration control systems as discussed by the authors are those which otherwise passively generated damping or spring forces are modulated according to a parameter tuning policy with only a small amount of control effort.