Ahmad Firdaus Ahmad Zaidi, Ts.This page provides access to scholarly publication by UniMAP Faculty members and researchers.http://dspace.unimap.edu.my:80/xmlui/handle/123456789/329012024-03-28T19:43:47Z2024-03-28T19:43:47ZDesign and development of sensing system for mines detector robotAhmad Firdaus, Ahamad ZaidiCherng, Yeoh WeiHandy, Ali MunirNur Hidayah, Ahmad Zaidihttp://dspace.unimap.edu.my:80/xmlui/handle/123456789/336042014-04-11T07:10:59Z2014-01-01T00:00:00ZDesign and development of sensing system for mines detector robot
Ahmad Firdaus, Ahamad Zaidi; Cherng, Yeoh Wei; Handy, Ali Munir; Nur Hidayah, Ahmad Zaidi
This paper presents the design and development of sensing system for mines detector robot. The objective of this project is to identify the optimum metal detection system and design and develop the sensing system of mines detection circuit for the landmine mobile robot. This sensing circuit of landmines detection system consists of pulse generation circuit, detector circuit, amplifier circuit, comparator circuit, microcontroller PIC18F4580 and the display result circuit through LCD screen. Size, type and shape of ferrous and non-ferrous object (landmines) will impinge on the output voltage signal from the search coil. The metal (iron) that was targeted in this project will be chosen based on an artificial detonator. Experimental results showed that this circuit able to sense ferrous and non-ferrous object (landmines) with satisfy sensitivity and consistent result.
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2014-01-01T00:00:00ZNumerical simulation study on lateral collapse of kenaf-foam composite filled in cylindrical tube subjected to dynamic loadingAhmad Mujahid, Ahmad ZaidiLang, Goh LingAhmad Firdaus, Ahmad Zaidihttp://dspace.unimap.edu.my:80/xmlui/handle/123456789/334232014-05-02T01:55:43Z2010-01-01T00:00:00ZNumerical simulation study on lateral collapse of kenaf-foam composite filled in cylindrical tube subjected to dynamic loading
Ahmad Mujahid, Ahmad Zaidi; Lang, Goh Ling; Ahmad Firdaus, Ahmad Zaidi
In this paper the energy absorption of kenaf foam filled cylindrical tube has been investigated. First, a finite element model for empty cylindrical tube was constructed and followed by a foam-filled cylindrical tube model. In this study, there were five samples of kenaf foam density that been used and they are 5%, 10%, 15%, 20% and 0% (100%PU) for three different thickness cylindrical tube. The implemented models were used to simulate the behavior of empty and foam-filled tubes under lateral dynamic loadings. An impact mass of 10kg with three different impact velocity, 10m/s, 15m/s and 20m/s were used in the empty tube model simulation. Meanwhile, for foam-filled tube, impact velocity had increased to10m/s, 20m/s and 30m/s. The energy absorption capability was increased with foam filler in the cylindrical tube and the best kenaf foam density was obtained at 15%. For 15% kenaf foam, the value of energy absorption was higher than 100% PU but the energy absorption decreases for 20%.The results showed that increases wall thickness and kenaf foam filler will increase the energy absorption.
Link to publisher's homepage at http://penerbit.uthm.edu.my/
2010-01-01T00:00:00ZPerformance of thermoelectric cooling system: effect of aluminium heat sink and heat dissipationMohd Hafis, SulaimanMohd Ridzuan, Mohd JamirAhmad Firdaus, Ahmad ZaidiMohammad Shahril, SalimNur Farahana, RamliCheong, Chee Kinhttp://dspace.unimap.edu.my:80/xmlui/handle/123456789/334212014-05-05T07:38:40Z2014-01-01T00:00:00ZPerformance of thermoelectric cooling system: effect of aluminium heat sink and heat dissipation
Mohd Hafis, Sulaiman; Mohd Ridzuan, Mohd Jamir; Ahmad Firdaus, Ahmad Zaidi; Mohammad Shahril, Salim; Nur Farahana, Ramli; Cheong, Chee Kin
This paper presents theoretical and experimental research works on the effect of aluminium heat sink and heat dissipation in a portable thermoelectric (TE) cooling system. In this study, three units of TE modules were utilized with an inputs of 3 A and 8 V. The aluminium heat sink was used to spread the heat generated by TE modules through its fins and surface area. The cold temperature was spread through by an aluminium cold sink with direct blow to the cooling space. The air flow rate was
accelerated by the use of centrifugal blower on both sides of the heat dissipation system. The temperature of the cooling space caused was examined. The performance of TE module with the utilization of hot and cold sinks has shown that a greater heat dissipation rate was achieved.
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2014-01-01T00:00:00ZDesign and simulation of fuzzy logic controller for boost converter in renewable energy applicationAhmad Firdaus, Ahmad ZaidiNormahira, Mamat @ Mohamad NorNurul Syahirah, KhalidSakinah, Jhttp://dspace.unimap.edu.my:80/xmlui/handle/123456789/333802014-05-02T07:05:25Z2013-01-01T00:00:00ZDesign and simulation of fuzzy logic controller for boost converter in renewable energy application
Ahmad Firdaus, Ahmad Zaidi; Normahira, Mamat @ Mohamad Nor; Nurul Syahirah, Khalid; Sakinah, J
This paper presents the design and simulation of a DC-DC boost converter which uses wind energy as input source. Nowadays, wind is a type of renewable energy that is sustainable and clean compared to other alternative energy. Generally wind in Malaysia blows at variably low speed thus producing variably low input voltage as energy source. DCDC boost converter can be used to increase the output voltage to a level suitable for domestic use. In this project, a closedloop DC-DC boost converter circuit was designed and simulated using MATLAB SIMULINK based from a topological circuit. In the simulation, the circuit was tested with different low input voltage values to a setpoint of 240V. In order to improve the output voltage transient response, Fuzzy Logic Controller is designed and implemented at the circuit to set the duty cycle of the switching device for the boost converter. The result has indicated better performance for boost DC-DC converter with FLC controller.
Proceedings of IEEE International Conference on Control System, Computing and Engineering (ICCSCE 2013) at Penang, Malaysia on 29 November 2013 through 1 December 2013.
2013-01-01T00:00:00Z