Fault Diagnosis of Gearbox Having Delrin Gear by Vibration and Noise Signal Analysis

The main objective of this study is to detect gearbox fault signals through vibration and noise signal analysis. Experimental tests were carried out using several sets of Healthy and faulty Delrin gears under different speeds and different loads. Initially, Healthy Delrin gears were assembled in the gearbox test rig and signals were sensed using accelerometer and microphone and recorded using data acquisition systems (DAQ) to know the standard behavior of normal gears. Then, the Healthy Delrin gears were replaced by faulty Delrin gears and signals were recorded for each one of the cases separately under the same condition. After that, five proposed techniques of measuring vibrations and noise, namely; Time domain analysis, Frequency Response Function(FRF), Fast Fourier Transform(FFT), Angular domain analysis, and Octave Band Analysis are employed to evaluate the gearbox defects. As of experimental results, it was establish that the vibration and noise signals play a significant role in evaluation of defects in the gearbox. Finally, it is found that the vibration amplitudes of the gearbox are increased resulting in increased tooth breakage under different speeds and different loads.