The dynamic model of the back-rest system of type WG-2000 air-jet loom is set up and the relevant nonlinear vibration analysis is investigated when principal parametric resonance is taken into consideration. Results show that the system will be unstable when the corresponding frequency of the rotating-speed meets Ω≈2ω0/n, it may have unstable region. The higher speed is, the wider the region is. The nonlinear dynamic analysis of the back-rest system can be benefit for engineering design and improvement of weaving technology.
NONLINEAR DYNAMIC ANALYSIS OF DRY FRICTION-INDUCED TORSIONAL VIBRATION IN A DRILL-STRING EXPERIMENTAL SET-UP