Hybrid optimisation electromagnetic interference shielding effectiveness:mechanical and physical performance of plaster mortar containing palm oil fuel ash using taguchi grey and taguchi-flower pollination algorithm methods
The rapid development of wireless telecommunications has revolutionarily modernized the global society, whereas it has created serious concerns on harmful effects of the electromagnetic interference (EMI) on human health and performance of electronic devices. The purpose of this research was to u...
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| Format: | Thesis |
| Language: | English English English |
| Published: |
2019
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| Subjects: | |
| Online Access: | http://eprints.uthm.edu.my/97/1/24p%20NARONG%20AL%20OH%20LAI%20CHING.pdf http://eprints.uthm.edu.my/97/2/NARONG%20AL%20OH%20LAI%20CHING%20WATERMARK.pdf http://eprints.uthm.edu.my/97/3/NARONG%20AL%20OH%20LAI%20CHING%20COPYRIGHT%20DECLARATION.pdf |
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| Summary: | The rapid development of wireless telecommunications has revolutionarily
modernized the global society, whereas it has created serious concerns on harmful
effects of the electromagnetic interference (EMI) on human health and performance of
electronic devices. The purpose of this research was to use palm oil fuel ash (POFA)
as cement filler in plastering mortar to overcome the EMI issue. This research adopted
Taguchi method with mix level design (L16 (44 22)) to examined the EMI shielding
effectiveness (SE), mechanical properties and physical properties of the mortar. Six
factors namely POFA admixture percentage, topcoat powder /binder ratio (TP/B),
water/binder ratio (W/B), latex agent content (LA), the particle size of POFA and
curing condition are used to control the nine responses. Pre-experiment data is
optimized based on Taguchi-grey and Flower Pollination Algorithm (FPA) methods.
The feasibility of the optimization was evaluated by repeating the experiments.
Initially, the POFA was refined and segregated into 4 different layers. Layer 1 POFA
performed highest SE with 25.76 dB at 1 GHz where the SE was decreased in
accordance with the sequence of POFA layers. The SEM image of POFA showed the
existence of cenosphere particles and it has potential in EMI SE due to the hollow
spherical shape. Regression and ANOVA analysis demonstrated the optimal mixture
from Taguchi-grey method is able to give additional 6 dB of SE compare to plaster
mortar without POFA. Meanwhile, the optimal mixture from Taguchi-FPA able to
give additional 5 dB of SE. It’s found that this does not affect its mechanical and
physical properties because the confirmation results proved that all responses are
within the range that specified in the standards. Finally, this research successfully
employed POFA as cement filler for plastering mortar which can mitigate the EMI.
The increase in the SE is due to the carbon content and spherical cenosphere particle
in the POFA that promote multiple reflections. The implementation of Taguchi-grey
and Taguchi-FPA methods successfully obtained optimal factors in order to improve
SE and remaining protection of mechanical and physical properties in plaster mortar. |
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