Research of Strength of Rotor System about Containing Blade Crackle Based on Nonlinear Dynamics

摘要

As the condition of a certain blade cracked of rotor system of fans,limited shortaxletree nonlinear dynamics model is used,the vibration frequency and nonlinear dynamic stability single-disc rotor is discussed,interior stress distribution and size of rotating shaft after loaded is analyzed concretely by ANSYS software.Through contrast X,Y,X-Y three directions stress distribution of rotating shaft interior,for entity model of near support disc and shaft,it is observed that its field of stress distribution compare dense is near-support field,also stress concentration is relatively bigger after load is added.Meanwhile ANSYS software is used to calculate by simulation this relation of the blade cracking spread width-temporal of four different alloy material and to count the intensity,stress distributing and the axial displacement of the axletree.The best numerical value about elastic modulus and hardness of the material is found by analysis the curve of crackle width-time function.