Hybrid viscous damper with filtered integral force feedback control

Høgsberg, Jan Becker; Brodersen, Mark Laier

doi:10.1177/1077546314543912

Cited by 16 publications

(28 citation statements)

References 36 publications

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“…This is also demonstrated by the latest achievements in this field, regarding systems incorporating viscous [17][18][19][20][21][22][23][24][25][26][27], metallic yielding [28][29][30] …”

Section: Supplemental Damping-based Retrofit Hypothesismentioning

confidence: 85%

Existing prefab R/C industrial buildings: Seismic assessment and supplemental damping-based retrofit

Sorace

Terenzi

2017

Soil Dynamics and Earthquake Engineering

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“…This is also demonstrated by the latest achievements in this field, regarding systems incorporating viscous [17][18][19][20][21][22][23][24][25][26][27], metallic yielding [28][29][30] …”

Section: Supplemental Damping-based Retrofit Hypothesismentioning

confidence: 85%

Existing prefab R/C industrial buildings: Seismic assessment and supplemental damping-based retrofit

Sorace

Terenzi

2017

Soil Dynamics and Earthquake Engineering

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“…Note, that this is similar to the introduction of a forgetting factor in [13]. The last term in (12) with the filter time constant τ f is added to compensate for the phase delay caused by the first term. The influence of this term will be demonstrated later in this section.…”

Section: The Hybrid Damper Conceptmentioning

confidence: 99%

Hybrid damper with stroke amplification for damping of offshore wind turbines

Brodersen

Høgsberg

2016

Wind Energy

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Abstract. The magnitude of tower vibrations of offshore wind turbines is a key design driver for the feasibility of the monopile support structure. A novel control concept for the damping of these tower vibrations is proposed, where viscous type hybrid dampers are installed at the bottom of the wind turbine tower. The proposed hybrid damper consists of a passive viscous dash-pot placed in series with a load cell and an active actuator. By integrated force feedback control of the actuator motion the associated displacement amplitude over the viscous damper can be increased compared to the passive viscous case, hereby significantly increasing the feasibility of viscous dampers acting at the bottom of the wind tower. To avoid drift in the actuator displacement a filtered time integration of the measured force signal is introduced. Numerical examples demonstrate that the filtered time integration control leads to performance similar to that of passive viscous damping and substantial amplification of the damper deformation without actuator drift.

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“…However, a limitation of passive systems is in their restricted performance bandwidth, which typically makes them applicable to single types of hazard only. A solution is to employ highperformance control systems (HPCSs), which include semi-active [6][7][8], hybrid [9][10][11] and active damping systems [12][13][14], that offer significantly higher controllability due to their mechanical or chemical adaptive capability. HPCS can therefore be used to protect structures against multiple simultaneous or non-simultaneous types of hazards, termed multi-hazards.…”

Section: Introductionmentioning

confidence: 99%

Input space dependent controller for civil structures exposed to multi-hazard excitations

Cao

Laflamme

Hong

et al. 2018

Engineering Structures

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A challenge in the control of civil structures exposed to multiple types of hazards is in the tuning of control parameters to ensure a prescribed level of performance under substantially different excitation dynamics, which could be considered as largely uncertain. A solution is to leverage data driven control algorithms, which, in their adaptive formulation, can self-tune to uncertain environments. The authors have recently proposed a new type of data-driven controller, termed input space dependent controller (ISDC), that has the particularity to adapt its input space in real-time to identify key measurements that represent the essential dynamics of the system. Previous studies have focused on time delay formulations, where the adaptive control rule would use time delayed measurements as inputs. In this configuration, termed variable multi-delay controller (VMDC), the time delay itself was adaptive, which provided the input space dependence capabilities. However, the size, or embedding dimension, of the input space was kept constant. In this paper, the authors formulate and study a strategy to also have the embedding dimension vary, therefore providing full adaptive input space capabilities. This generalization of the ISDC algorithm will allow the controller to adapt to excitations with higher levels of chaos, such as a seismic event. The performance of ISDC under multi-hazard excitations is first investigated on a single-degree-of-freedom system and compared with the previously developed and demonstrated VMDC. Results show that the adaptive embedding dimension provides significantly enhanced mitigation performance. After, the ISDC performance is assessed on two benchmark buildings equipped with a semi-active friction device and subjected to non-simultaneous multihazard excitations (wind, blast and earthquake). Results are compared with a sliding mode controller, where the ISDC is shown to provide better mitigation capabilities. A B S T R A C TA challenge in the control of civil structures exposed to multiple types of hazards is in the tuning of control parameters to ensure a prescribed level of performance under substantially different excitation dynamics, which could be considered as largely uncertain. A solution is to leverage data driven control algorithms, which, in their adaptive formulation, can self-tune to uncertain environments. The authors have recently proposed a new type of data-driven controller, termed input space dependent controller (ISDC), that has the particularity to adapt its input space in real-time to identify key measurements that represent the essential dynamics of the system. Previous studies have focused on time delay formulations, where the adaptive control rule would use time delayed measurements as inputs. In this configuration, termed variable multi-delay controller (VMDC), the time delay itself was adaptive, which provided the input space dependence capabilities. However, the size, or embedding dimension, of the input space was kept constant. In this paper, the authors formulate a...

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Hybrid viscous damper with filtered integral force feedback control

Cited by 16 publications

References 36 publications

Existing prefab R/C industrial buildings: Seismic assessment and supplemental damping-based retrofit

Existing prefab R/C industrial buildings: Seismic assessment and supplemental damping-based retrofit

Hybrid damper with stroke amplification for damping of offshore wind turbines

Input space dependent controller for civil structures exposed to multi-hazard excitations

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