Fatigue Prediction on Wheel’s Hub Under Random Vibration Based on Road Roughness

Subject Areas : Vibration Transmision

Kazem  Reza kashi Zadeh ¹ (Department of Mechanical Engineering, Semnan Branch, Islamic Azad University, Semnan, Iran)
Mohamad Jafar  Ostad Ahmad Ghorabi ² (Department of Mechanical Engineering, Semnan Branch, Islamic Azad University, Semnan, Iran)
Alireza  Arghavan ³ (Department of Mechanical Engineering, Semnan Branch, Islamic Azad University, Semnan, Iran)

Received: 2015-04-20 Accepted : 2015-04-20 Published : 2011-05-22

Keywords: Fatigue, hub, Random vibration, Road roughness, Topography,

Abstract :

This paper presents the fatigue life behavior of hub using random vibration based on road roughness. The main objectives of this study are to predict the fatigue life and to identify the critical location for evaluating fatigue damage. Asphalt road surface profiles obtained in favorable circumstances by topography cameras and in according road classification ISO 2631-1estimate road roughness such as power spectral density in a constant vehicle velocity or PSD Function by simulating motion model of a quarter cars in Matlab Software. The fatigue life is predicted, utilizing the finite element based on fatigue analysis code. The structural model of the hub was utilizing the cation by using CMM scanner. The finite element model and random vibration analysis were performed utilizing the finite element analysis code , and the critical stress with Von Misses criterion is estimated about 237MPa at the end of the wheel hub. In addition, the fatigue life was predicted using different types of approaches such as Dirlik, Maro and …… subjected to variable amplitude loading. Finally, this research described that fatigue life of component based on certain loading and conditions is estimated about 116000Km of travel length of the vehicle.