Controlling Floor Vibration with Active and Passive Devices

2010

Engineering Structures

Active vibration control (AVC) via a proof-mass actuator is considered to be a suitable technique for the mitigation of vibrations caused by human motions in floor structures. It has been observed that actuator dynamics strongly influence structure dynamics despite considering collocated actuator/sensor control. The well-known property of the interlacing of poles and zeros of a collocated control system is no longer accomplished. Therefore, velocity-based feedback control, which has been previously used by other researchers, might not be a good solution. This work presents a design process for a control scheme based on acceleration feedback control with a phase-lag compensator, which will generally be different from an integrator circuit. This first-order compensator is applied to the output (acceleration) in such a way that the relative stability and potential damping to be introduced are significantly increased accounting for the interaction between floor and actuator dynamics. Additionally, a high-pass filter designed to avoid stroke saturation is applied to the control signal. The AVC system designed according to this procedure has been assessed in simulation and successfully implemented in an in-service openplan office floor. The actual vibration reductions achieved have been approximately 60% for walking tests and over 90% for a whole-day vibration monitoring.

Section: Control Strategy and System Dynamicsmentioning

confidence: 99%

Section: Proof-mass Actuator Dynamicsmentioning

confidence: 99%

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Acceleration feedback control of human-induced floor vibrations

Díaz

2010

Engineering Structures

“…AVC technology, making use of collocated sensor and actuator pairs, and employing the direct velocity feedback (DVF) controller has been successfully implemented in field trials to enhance the vibration serviceability performance of some floors [7,8,9]. Additional studies have looked into designing appropriate compensators to improve the robustness of the DVF controller [10].…”

Section: Introductionmentioning

confidence: 99%

Fuzzy Logic Controller Scheme for Floor Vibration Control

Nyawako

MATEC Web of Conferences

Pimentel

et al. 2015

Abstract. The design of civil engineering floors is increasingly being governed by their vibration serviceability performance. This trend is the result of advancements in design technologies offering designers greater flexibilities in realising more lightweight, longer span and more open-plan layouts. These floors are prone to excitation from human activities. The present research work looks at analytical studies of active vibration control on a case study floor prototype that has been specifically designed to be representative of a real office floor structure. Specifically, it looks at tuning fuzzy control gains with the aim of adapting them to measured structural responses under human excitation. Vibration mitigation performances are compared with those of a general velocity feedback controller, and these are found to be identical in these sets of studies. It is also found that slightly less control force is required for the fuzzy controller scheme at moderate to low response levels and as a result of the adaptive gain, at very low responses the control force is close to zero, which is a desirable control feature. There is also saturation in the peak gain with the fuzzy controller scheme, with this gain tending towards the optimal feedback gain of the direct velocity feedback (DVF) at high response levels for this fuzzy design.

“…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

Topics in Dynamics of Civil Structures, Volume 4

Hudson

2013

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.