The Parameter Vibration Of Shroud Blade

For the stability and safety of the blade, blades are often designed with friction interfaces, For the shroud blades, people concern the influence on vibration characteristic by friction damping very much. The domestic, outside many scholars done many work to the friction damping in the theories and experiment. But because of friction damping existence very strong of non-linear, so can hardly find out accurate describe this kind of ideal model of problem.This text uses an Averaging Method that making the non-autonomous system become autonomous system. Then analyzed the averaged equation, get to analyze a solution and carry on stability analysis towards analyze solution. The end still discussed a balance point the track of the neighborhood to distribute regulation. The result express:1) Friction to the second rank vibration characteristic influence very greatly, but have no effect to the first rank.2) The existence of friction damping makes the second rank do not continuously(appear two different swing during the period of vibrate)vibrate, and appear two different resonance frequencies.3) Stabilize the solution is a stable focus, rather than the stable solution is a saddle to order.4) When the damping enlarge, the vibration responds diminish. The stable zone of the solution is under the influence of damping, the damping decides in the meantime whether system bifurcation or not.5) The vibration response and the resonance frequency under the influence of force. When the force enlarge, the vibration response and resonance frequency increase.