Abstract
This paper discuses a acceleration response model of a cracked plastic gear using rectangle pulse train and reveals the effect of the pulse train on the Fourier coefficients. First of all, by using a high capacity endurance-testing machine, a rotation fatigue testing of a POM (Polyoxymethylene) gear is carried out. The Effect of the crack at the dedendum on the acceleration waveform is analyzed and the frequency analysis of the data is also performed. The obtained revelation is examined, and the acceleration response model of the cracked plastic gear is proposed. The proposed model is consisting of the rectangle pulse train expressing the normally meshing gears and the other rectangle pulse train representing the crack at the dedendum of the gear. The theoretical Fourier coefficients of the pulse trains are derived and the relationship between the coefficients and the frequency analysis results of the experimental data are explained.
