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.
Highlights
With the ever-increasing trends towards lightweight, longer-span and more open plan floor layouts, there are ongoing concerns towards their vibration serviceability performance
active vibration control (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]
The work presented here has looked at comparative studies between the DVF controller and a fuzzy controller scheme that is designed to offer variable velocity feedback gains depending on the structural velocity and acceleration response levels
Summary
With the ever-increasing trends towards lightweight, longer-span and more open plan floor layouts, there are ongoing concerns towards their vibration serviceability performance. Amidst the wide array of controllers available, which can be placed in various categories ranging from direct output feedback to model-based controllers, the fuzzy control scheme possesses some design freedoms that could be adapted, for example, to deal with different structural response levels. It has often been classified as an intelligent controller [11] and does not require an accurate model of the structure to be controlled. This work provides comparative studies of vibration mitigation performance between a direct velocity feedback (DVF) controller and a fuzzy controller scheme. Control forces, actuator mass displacement and velocity gains derived from the fuzzy controller for different sets of response levels are monitored
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