perumal, Sivachandran R.
(2022)
Design And Simulation Of A Fuzzy Logic
Based Circadian Smart Led Lighting
System And Its Potential For
Healthcare Facilities.
PhD thesis, Universiti Sains Malaysia.
Abstract
This proof-of-concept research introduces a fuzzy logic-based lighting control
system design to illuminate indoor spaces using Light Emitting Diode (LED) lighting
technology by replicating outdoor circadian lighting to building indoor spaces. Past
research shows circadian lighting affects occupants’ well-being by dictating their sleep
and wake patterns. Previous works on replicating outdoor lighting had designers
using classical closed loop control architecture, which required extensive mathematical
modelling of the system dynamics. Fuzzy logic-based control systems costs less, robust,
portable, and easily applicable for complex non-linear control systems without the need
for system modelling. A methodology of autonomous regulation of lighting Correlated
Colour Temperature (CCT) and space illuminance (lux) is applied using a 7×5 fuzzy
rules base matrix using Mamdani max-min compositional operation. The design was
evaluated by simulating a small-scale prototype to analyse the controller’s performance.
Simulation results show the system output matched outdoor chromaticity values and
the deviation from blackbody curve was within ±0.003 range using CCT Duv check.
The system performed at no overshoot (0.0%), rise time and steady state reached at 1st
and 4th iteration, respectively. Potential application at hospital ward are discussed by
correlating with healthcare’s practise and parameters which showed increased facility
efficiencies. Future works may experiment with spectrometric sensors and real time
applications.
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