Vibration Suppression with Resettable Device

Jabbari, Faryar; Bobrow, J.E.

doi:10.1061/(asce)0733-9399(2002)128:9(916)

Cited by 70 publications

(60 citation statements)

References 17 publications

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“…For example, given a sinusoidal response, a typical viscously damped, linear structure has the hysteresis loop definitions schematically shown in Figure 1a, where the linear force deflection response is added to the circular force-deflection response due to viscous damping to create the well-known overall hysteresis loop. Figure 1b shows the same behaviour for a simple resetable device where all stored energy is released at the peak of each sine-wave cycle and all other motion is resisted [7]. This form is denoted a "1-4 device" as it provides damping in all four quadrants.…”

Section: Introductionmentioning

confidence: 93%

Re‐shaping hysteretic behaviour—spectral analysis and design equations for semi‐active structures

Rodgers

Mander

Chase

et al. 2006

Earthq Engng Struct Dyn

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Semi-active dampers offer significant capability to reduce dynamic wind and seismic structural response. A novel resetable device with independent valve control laws that enables semi-active re-shaping of the overall structural hysteretic behaviour has been recently developed, and a onefifth scale prototype experimentally validated. This research statistically analyses three methods of re-shaping structural hysteretic dynamics in a performance-based seismic design context. Displacement, structural force, and total base-shear response reduction factor spectra are obtained for suites of ground motions from the SAC project. Results indicate that the reduction factors are suite invariant. Resisting all motion adds damping in all four quadrants and showed 40-60% reductions in the structural force and displacement at the cost of a 20-60% increase in total base-shear. Resisting only motion away from equilibrium adds damping in quadrants 1 and 3, and provides reductions of 20-40%, with a 20-50% increase in total base-shear. However, only resisting motion towards equilibrium adds damping in quadrants 2 and 4 only, for which the structural responses and total base-shear are reduced 20-40%. The spectral analysis results are used to create empirical reduction factor equations suitable for use in performance based design methods, creating an avenue for designing these devices into structural applications. Overall, the reductions in both response and base-shear indicate the potential appeal of this semi-active 1

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Section: Introductionmentioning

confidence: 93%

Re‐shaping hysteretic behaviour—spectral analysis and design equations for semi‐active structures

Rodgers

Mander

Chase

et al. 2006

Earthq Engng Struct Dyn

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“…kM2opt (Rubber Bearings) cM2opt (Viscous Damper) loops represent basic, idealized resetable device operations [26,[29][30][31].…”

Section: No Tmd (Mdof) Ptmd (Mdof)mentioning

confidence: 99%

“…It has introduced a novel device design with independent chambers that disassociates the chamber pressures resulting in control law applications not possible for the original [31] proposed design. For this standard case, devices with up to 1.7MN are already in use in limited numbers for commercial structures [32,33].…”

Section: No Tmd (Mdof) Ptmd (Mdof)mentioning

confidence: 99%

Semi‐active tuned mass damper building systems: Application

Chey

Chase

Mander

et al. 2009

Earthq Engng Struct Dyn

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SUMMARYSeismic performance attributes of multi-story passive and semi-active tuned mass damper (PTMD and SATMD) building systems are investigated for 12-story moment resisting frames modeled as '10+2' stories and '8+4' stories. Segmented upper portion of the stories are isolated as a tuned mass, and a passive viscous damper or semi-active resetable device is adopted as energy dissipation strategy. The semi-active approach uses feedback control to alter or manipulate the reaction forces, effectively re-tuning the system depending on the structural response. Optimum TMD control parameters and appropriate matching SATMD configurations are adopted from a companion study on a simplified two-degree-of-freedom (2-DOF) system. Statistical performance metrics are presented for 30 probabilistically scaled earthquake records from the SAC project. Time history analyses are used to compute response reduction factors across a wide range of seismic hazard intensities. Results show that large SATMD systems can effectively manage seismic response for multi-degree-of freedom (MDOF) systems across a broad range of ground motions in comparison to passive solutions. Specific results include the identification of differences in the mechanisms by which SATMD and PTMD systems remove energy, based on the differences in the devices used. Additionally, variability is seen to be tighter for the SATMD systems across the suites of ground motions used, indicating a more robust control system. While the overall efficacy of the concept is shown the major issues, such as isolation layer displacement, are discussed in details not available in simplified spectral analyses, providing further insight into the dynamics of these issues for these systems.

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“…Jabbari also presents a piston/cylinder system whose two chambers are connected by a valve. This device works by adding stiffness to the system when the valve is closed, and dissipating the absorbed energy when the valve is opened [6]. A variant of the piston/cylinder system uses magnetorheological (MR) fluids.…”

Section: Introductionmentioning

confidence: 99%

Variable compliance device for a respiratory physiotherapy training simulator

Bussing

Goujon²,

Barthod³

2012

2012 9th France-Japan &Amp; 7th Europe-Asia Congress on Mechatronics (MECATRONICS) / 13th Int'l Workshop on Research and Educat

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Abstract-Semi active devices to modify the stiffness or the damping of systems received significant attention in the recent years. In this paper, two solutions of a variable compliance device to change the physiotherapists feeling of the thorax compliance of a 6-month old infant torso training simulator are presented. A first solution, using a variable orifice device which allows to change the compliance by changing the radius of a flow pipe is proposed. Another solution is to use a magnetorheological fluid damper. Both systems are presented in detail and discussed especially for their applicability to be integrated in the simulator.

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Vibration Suppression with Resettable Device

Cited by 70 publications

References 17 publications

Re‐shaping hysteretic behaviour—spectral analysis and design equations for semi‐active structures

Re‐shaping hysteretic behaviour—spectral analysis and design equations for semi‐active structures

Semi‐active tuned mass damper building systems: Application

Variable compliance device for a respiratory physiotherapy training simulator

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