Abstract—The gear fitted in the gearbox Armored tracked vehicle is vulnerable to considerable fatigue damage over its life period due to the dynamic excitations caused by the terrain undulations, the rotating wheel and track assemblies. For this purpose, initially static analysis of the model was carried out to validate the model and the boundary conditions correctness. Further Modal analysis is carried out to determine the dynamic characteristics of the gear model. The random load time history is transformed in to frequency domain using Fast Fourier transform to obtain load Power Spectral Density (PSD). Then the stress PSD response is obtained at critical node from the random vibration analysis. Once the spectrum of stress variation is obtained given input to the fatigue analysis and fatigue life is determined by FE package ANSYS 11.0.

Index Terms—Spur gear, Static analysis, Modal analysis, PSD analysis

Cite: Sameer Chakravarthy N C and B Subbaratnam, "Finite Element Analysis and Fatigue Analysis of Spur Gear under Random Loading," International Journal of Mechanical Engineering and Robotics Research, Vol.3, No.4, pp. 533-541, October 2014.