Implementing Fast Fourier Transform (FFT) Method In Determining The Speed Of The Rotary Encoder For The Tribotronic System In The Pin-On-Disc Tribometer (PODT)

Publication Issue: 
Volume 36, Issue 1, 2015
Page No: 
Date Received: 
Monday, July 20, 2015
Authors' Name: 
Siti Fazlili Abdullah
Shaparuddin M Bahrudin
Authors' Affiliation and Address: 
Center for Mirco and Nano Engineering, College of Engineering, Universiti Tenaga Nasional, Jalan IKRAM-UNITEN, 43000 Kajang, Selangor, Malaysia
A study has been conducted for utilizing Fast Fourier Transform (FFT) method in order to calculate the speed in revolutions per minute (rpm) of rotary encoder for the Tribotronic System. The value of pulses signal from rotary encoder are captured directly into the data logger and read by MATLAB inside PC. FFT method is used to convert this pulses signal into the frequency domain. The value of the speed will be taken into account when the speed frequency domain correspond to the highest amplitude. The results of these experimental values are compared to the industrial standard Pulse Meter in order to evaluate its performance in term of fluctuation and error in each speed region from 100 rpm to 800 rpm. It is revealed that the highest fluctuation difference of 0.21% and highest error difference of 0.0018% at 200 rpm and 100 rpm respectively. As a conclusion the FFT method proved competent for rpm measurement of the rotary encoder for the Tribotronic System