Vibration control using a variable coil-based friction damper

Amjadian, Mohsen; Agrawal, Anil K.

doi:10.1117/12.2257143

Cited by 8 publications

(9 citation statements)

References 15 publications

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“…A solution to improve the performance of structural system versus a variety of hazard types, termed multihazards, is to leverage high performance control systems (HPCSs). HPCSs include active [38,39,40], semiactive [41,42,43] and hybrid control strategies [44,45,46]. These systems are capable of higher performance over a large bandwidth due to their adaptive capabilities, ideal for multi-hazard mitigation [47,48].…”

Section: Goodno Andmentioning

confidence: 99%

Variable friction cladding connection for seismic mitigation

Gong

Cao

Laflamme

et al. 2019

Engineering Structures

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Cladding systems are conventionally designed to serve an architectural purpose and provide environmental protection for building occupants. Recent research has been conducted to enhance structural resiliency by leveraging cladding systems against man-made and natural hazards. The vast majority of the work includes the use of sacrificial cladding panels and energy dissipating connectors. These passive protection systems, though effective, have typically targeted a single hazard one-at-a-time because of their limited frequency bandwidths. A novel semi-active friction connection has been previously proposed by the authors to leverage the cladding motion for mitigating blast and wind hazards. This semi-active friction device, termed variable friction cladding connection (VFCC), is designed to laterally connect cladding elements to the structural system and dissipate energy via friction. Its variable friction force is generated onto the sliding friction plates upon which a variable normal force is applied via actuated toggles. Because of its semi-active capabilities, the VFCC could be used over wide-band excitation frequencies and is thereby, an ideal candidate for multiple hazard mitigation. The VFCC in its passive in situ mode has been previously designed to mitigate air-blast effects towards the structure and its semi-active scheme has been applied to wind hazard mitigation. In this paper, a motion-based design (MBD) procedure is developed to apply the VFCC to seismic hazard mitigation, completing its application against multiple hazards. The MBD procedure begins with the quantification of seismic load and performance objectives, and afterwards, dynamic parameters of the cladding connection are selected based on non-dimensional analytical solutions. Simulations are conducted on two example buildings to verify and demonstrate the motion-based design methodology. Results show the semi-actively controlled VFCC is capable of mitigating the seismic vibrations of structures, demonstrating the promise of the semiactive cladding system for field applications.

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Section: Goodno Andmentioning

confidence: 99%

Variable friction cladding connection for seismic mitigation

Gong

Cao

Laflamme

et al. 2019

Engineering Structures

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“…For instance, passive energy dissipation systems have bandwidth-limited mitigation capabilities [2,3]. A solution is the utilization of high performance control systems (HPCSs) that include active [4,5,6], semi-active [7,8,9] and hybrid control systems [10,11,12].…”

Section: Introductionmentioning

confidence: 99%

Motion-based design approach for a novel variable friction cladding connection used in wind hazard mitigation

Gong

Cao

Laflamme

et al. 2019

Engineering Structures

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Cladding systems typically serve architectural purposes and protect occupants against the external environment. It is possible to leverage these systems to enhance structural resiliency. A common application is the use of blast resistant panels for enhanced protection against man-made hazards, whereas energy is dissipated through sacrificial elements. However, because these protection systems are passive, their mitigation capabilities are bandwidth limited, therefore targeting single types of hazards. The authors have recently proposed a novel variable friction cladding connection (VFCC), which enables the leveraging of cladding inertia for mitigating blast, wind, and seismic hazards. The variation in the friction force is generated by an actuator applying pressure onto sliding friction plates via a toggle system. Previous work has characterized the dynamic behavior of a VFCC prototype, and established design procedures for blast mitigation applications. Here, work is extended for applications to wind mitigation. An analytical model is developed to characterize the dynamic behavior of the VFCC for wind-induced vibrations. A motion-based design framework is developed to enable an holistic integration of the device within the structural design phase. Numerical simulations are conducted on a 24-story building example to demonstrate the motion-based design methodology. Results show that the semi-active cladding system provides significant reduction in the wind-induced inter-story drift and floor acceleration, therefore demonstrating the promise of the VFCC for field applications.

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“…While passive damping systems are now widely accepted and applied in the structural engineering field (Ubertini 2010;Wu and Phillips 2017;Amjadian and Agrawal 2018), they typically exhibit a limited performance bandwidth, and are therefore restricted to achieve the prescribed performance under a single type of hazard (He et al 2003;Lu et al 2008;Cao et al 2016). Recently, research on high-performance control systems (HPCSs), including active (Ubertini 2008;Materazzi and Ubertini 2011;Venanzi et al 2012), semi-active (Cao et al 2015;Amjadian and Agrawal 2017;Lu et al 2018) and hybrid (Love et al 2011;Shin et al 2013;Høgsberg and Brodersen 2014) systems, has demonstrated the great potential of these devices for vibration mitigation. Due to their adaptive nature, HPCSs have the capability to perform over a wide excitation bandwidth.…”

Section: Introductionmentioning

confidence: 99%

Life-Cycle Cost Evaluation Strategy for High-Performance Control Systems under Uncertainties

et al. 2020

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High-performance control systems (HPCSs), including active, hybrid, and semi-active control strategies, can perform over a wide excitation bandwidth and are therefore good candidates for multi-hazard mitigation. However, the number of HPCS applications in the field is very limited. This is likely due the perceived high costs of installation, maintenance, possible malfunction, and lack of tools to financially justify their implementation. Such financial justifications could be conducted through life cycle cost (LCC) analysis, but would result in a computationally demanding task due to the very large number of simulations required given the large number of uncertainties. In this paper, two sets of methods for conducting LCC analyses are compared, and their performance is assessed as a function of LCC estimation accuracy and computational requirements. The first set is based on deterministic scenarios, and is based on the simulation of all possible scenarios, termed what-if analysis. Variations of the what-if method are investigated, where the simulations are only conducted for the most likely scenarios, termed most-likely (ML) analysis. The second set is based on stochastic scenarios, and is based on Monte-Carlo (MC) analysis. Variations of the MC method are investigated, one based on the coefficient of variation of output data, and one proposed by the authors based on the convergence of the estimated costs, termed bounded MC. A demonstration of the LCC analysis methodology is conducted, where an HPCS is used for the mitigation of seismic-induced vibrations on a five story structure. Uncertainties under consideration include sensor failure, mechanical wear, and seismic events. Results are compared against the uncontrolled structure and a passive viscous strategy, and demonstrate that 1) the LCC methodology can be used to financially justify the utilization on an HPCS; and 2) the bounded MC method leads to accurate cost estimations using a lower number of simulations.ABSTRACT High-performance control systems (HPCSs), including active, hybrid, and semi-active control strategies, can perform over a wide excitation bandwidth and are therefore good candidates for multi-hazard mitigation. However, the number of HPCS applications in the field is very limited. This is likely due the perceived high costs of installation, maintenance, possible malfunction, and lack of tools to financially justify their implementation. Such financial justifications could be conducted through life cycle cost (LCC) analysis, but would result in a computationally demanding task due to the very large number of simulations required given the large number of uncertainties. In this paper, two sets of methods for conducting LCC analyses are compared, and their performance is assessed as a function of LCC estimation accuracy and computational requirements. The first set is based on deterministic scenarios, and is based on the simulation of all possible scenarios, termed what-if analysis. Variations of the what-if method are investigated,where the simu...

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Vibration control using a variable coil-based friction damper

Cited by 8 publications

References 15 publications

Variable friction cladding connection for seismic mitigation

Variable friction cladding connection for seismic mitigation

Motion-based design approach for a novel variable friction cladding connection used in wind hazard mitigation

Life-Cycle Cost Evaluation Strategy for High-Performance Control Systems under Uncertainties

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