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Articles by J.A. Ghani
Total Records ( 2 ) for J.A. Ghani
  G.A. Ibrahim , C.H. Che Haron and J.A. Ghani
  In this study, surface integrity generated when machining Ti-6Al-4V-ELI alloy with coated cemented carbide tools under dry condition was investigated. The surface roughness values recorded when machining Ti-6Al-4V-ELI with coated carbide tools was lower at higher feed rate and generally, these curves consist of three stages. The machined surface generated consists of well-defined uniform feed marks running perpendicular to the tool feed direction. Surface damages on the machined surface generated observed after machining are deformation of feed marks and re-deposited workpiece material. The thin layer of disturbed or plastically deformed layer was formed immediately underneath the machined surface and it was found when cutting operation at cutting speed of 95, feed rate of 0.35 mm rev-1 and depth of cut of 0.10 mm and at the end of tool life.
  Z. Karim , M.Z. Nuawi , A.Y. Md Said , J.A. Ghani and S. Abdullah
  The response of Integrated Kurtosis-Based Algorithm for Z-Notch Filter (I-kazTM) Multilevel coefficients toward the simultaneous changes in amplitude and frequency of signals was unknown. This study presents the coefficients responses toward the synthetic signals which vary in amplitude and frequency simultaneously. The I-kazTM Multilevel coefficients, 3rd order (3Z), 4th order (4Z), 5th order (5Z), 6th order (6Z), 7th order (7Z) and 8th order (8Z) were investigated by analyzing their response using three types of synthetic signals, FIAI, FIAD and FDAI. The responses of the I-kazTM Multilevel coefficients were analyzed by either increasing or decreasing the amplitude and frequency in the synthetic signals simultaneously. This study indicated that the response of all orders of I-kazTM Multilevel coefficients showed an increasing trend with respect to the increment in amplitude of FIAI and FDAI. All the coefficients however showed a decreasing trend in FIAD synthetic signal study regardless the increase in the frequency. The study also indicated that the change in amplitude has more influence than the change in frequency in the I-kazTM Multilevel coefficients responses. The influence ratio of the amplitude to frequency change was estimated to be 86.96-13.06%, respectively. Recognizing the behaviour of I-kazTM Multilevel coefficients toward the change in amplitude and frequency is important especially when analysing dynamic signals.
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