Abstract： By numerical simulation and experimental, the dynamic response characteristics of unintentional unscrewing of threaded connection under vibration condition was researched. Features values of joints failure early-warning was found out. Firstly, qualitative analysis of the unintentional unscrewing process was preceded. Subsequently, a simplified dynamic model of the screw joint was built and verified. Finally, by analysis of experimental data, the THD was put forward as a better early-warning indicator. The results showed that the THD was a better early-warning indicator whether sinusoidal excitation or frequency bandlimited random excitation
2010, Vol. 29 
