Response-dependent velocity feedback control for mitigation of human-induced floor vibrations

Nyawako, Donald S.; Reynolds, Paul

doi:10.1088/0964-1726/18/7/075002

Cited by 18 publications

(13 citation statements)

References 19 publications

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“…The slab structure presented here has been previously used for the study of active vibration mitigation techniques in floor structures due to human induced excitations [30,31]. The total length of this simply-supported slab is 11.2 m which includes 200 mm overhangs over each edge support.…”

Section: Experimental Set Upmentioning

confidence: 99%

Design of remotely located and multi-loop vibration controllers using a sequential loop closing approach

Ubaid

Daley

Pope

2015

Control Engineering Practice

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In some applications, vibration control objectives may require reduction of levels at locations where control system components cannot be sited due to space or environmental considerations. Control actuators and error sensors for such a scenario will need to be placed at appropriate locations which are potentially remote from the points where ultimate attenuation is desired. The performance of the closed loop system, therefore, cannot be assessed simply by the measurement obtained at this local error sensor. The control design objective has to take into account the vibration levels at the remote locations as well. A design methodology was recently proposed that tackles such problems using a single-loop feedback control architecture. The work in this paper describes an extension of this control design procedure to enable the systematic design of multiple decentralised control loops. The approach is based upon sequential loop closing and conditions are provided that ensure that closed loop stability is maintained even in the event of failure in some control loops. The design procedure is illustrated through its application to a laboratory scale slab floor that replicates the problems associated with human induced vibration in large open-plan office buildings. The experimental results demonstrate the efficacy of the approach and significant suppression of the dominant low frequency modes in the floor is achieved using two independent acceleration feedback control loops.

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Section: Experimental Set Upmentioning

confidence: 99%

Design of remotely located and multi-loop vibration controllers using a sequential loop closing approach

Ubaid

Daley

Pope

2015

Control Engineering Practice

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“…Full details of these past controllers and associated designs can be seen in [8,9,10,7,11,12]. All the controllers used were designed with adequate stability margins and a typical DVF scheme with inner loop actuator compensation as is shown in Figure 5.…”

Section: Active Vibration Control Designs and Feasibilitymentioning

confidence: 99%

“…Typical controller schemes that have been investigated in both laboratory and field trials include direct velocity feedback (DVF), compensated acceleration feedback (CAF), response dependent velocity feedback (RDVF), onoff velocity and acceleration feedback schemes, integral resonant control, and pole-placement type schemes [3,6,7,8,9,10,11,12].…”

Section: Introductionmentioning

confidence: 99%

Findings with AVC Design for Mitigation of Human Induced Vibrations in Office Floors

Nyawako

Reynolds

Hudson

2013

Topics in Dynamics of Civil Structures, Volume 4

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This paper looks at AVC studies in three different office floor case studies in past field trials. Some of the estimated modal properties for each of these floors from experimental modal analysis (EMA) tests are shown as well as some selected mode shapes of fundamental modes of vibration. These reflect the variability in their dynamic characteristics by virtue of their different designs and thus the potential for their 'liveliness' under human induced excitation. An overview of some of the controller schemes pursued in the various field trials are mentioned as well as a brief insight being provided into some challenges encountered in their designs and the physical siting of the collocated sensor and actuator pairs used in the field trials. The measure for the vibration mitigation performances in this work is in the form of uncontrolled and controlled point accelerance FRFs which show attenuations in the target modes of vibration between 13-18 dB. These tests also show the variability in vibration mitigation performances between the various controllers.

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“…The laboratory structure used in this study is a simply supported post-tensioned slab strip with length 10.8 m, width 2.0 m and depth 0.275 m. The total weight of the slab is approximately 15 tonnes [16].…”

Section: Model Of the Structurementioning

confidence: 99%

“…jumping force) and the output (i.e. structural acceleration) is calculated as lower [16]. Also, it should be noted that the frequency of the structure in Figure 2-1 is shifted from 4.44 to 4.33 due to the presence of additional mass on the slab during the EMA (which was the locked TMD acting as a passive mass on the structure).…”

Section: Model Of the Structurementioning

confidence: 99%

Experimental investigation of dynamic performance of a prototype hybrid tuned mass damper under human excitation

Noormohammadi¹,

Reynolds²

2013

SPIE Proceedings

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Current sport stadia designs focus mainly on maximizing audience capacity and providing a clear view for all spectators. Hence, incorporation of one or more cantilevered tiers is typical in these designs. However, employing such cantilevered tiers, usually with relatively low damping and natural frequencies, can make grandstands more susceptible to excitation by human activities. This is caused by the coincidence between the activity frequencies (and their lowest three harmonics) and the structural natural frequencies hence raising the possibility of resonant vibration. This can be both a vibration serviceability and a safety issue.Past solutions to deal with observed or anticipated vibration serviceability problems have been mainly passive methods, such as tuned mass dampers (TMDs). These techniques have exhibited problems such as lack of performance and offtuning caused by human-structure interaction. To address this issue, research is currently underway to investigate the possible application of hybrid TMDs (HTMDs), which are a combination of active and passive control, to improve the vibration serviceability of such structures under human excitation.The work presented here shows a comparative experimental investigation of a passive TMD and a prototype HTMD applied on a slab strip structure. The most effective control algorithm to enhance the performance of the HTMD and also deal with the off-tuning problem is investigated. The laboratory structure used here is an in-situ cast simply-supported post-tensioned slab strip excited by forces from a range of human activities.

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Response-dependent velocity feedback control for mitigation of human-induced floor vibrations

Cited by 18 publications

References 19 publications

Design of remotely located and multi-loop vibration controllers using a sequential loop closing approach

Design of remotely located and multi-loop vibration controllers using a sequential loop closing approach

Findings with AVC Design for Mitigation of Human Induced Vibrations in Office Floors

Experimental investigation of dynamic performance of a prototype hybrid tuned mass damper under human excitation

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