Vibrational and Noise Signal Analysis to Detect the Gear Teeth Damage in A Gear Box with Austempered Ductile Iron as Gear Material

Abstract

The gearbox is the primary tool of power transmission. The efficiency and smooth working of the gearbox are necessary to maximize the performance of the machine. But like any mechanical component it can fail. So, the gearbox is put under condition monitoring for finding signs of failure. The purpose of this project is to conduct vibration, sound and order analysis of the gearbox with austempered ductile iron gear. The data for this experiment are gathered by using DAQ. The procedure for monitoring the gearbox is to take vibration, sound and order tracking for new healthy gear and keep it as a standard or as reference. When a faulty gear is in the gearbox the vibration, sound and order change its pattern when compared to the healthy gear. By studying these patterns, we can deduce the type of failure. A major such defect is breakage of teeth. We can determine the defect buy studying the gearbox’s time domain to find the periodicity of vibration abnormality. The FFT and order analysis show the increase in the amplitude of sidebands and gearmesh frequency (GMF) with natural frequency visible in the spectrum. The sound analysis with 1/3 octave shows a significant increase in sound pressure level when compared with healthy gear. The experiment is carried out for various RPM level.