Abstract
AbstractThis paper focused on the influence of breathing crack parameters on blade vibration characteristics. Based on the first-order bending vibration assumption of Euler–Bernoulli cantilever beam theory, the nonlinear dynamic equation of blade with breathing crack was derived. The vibration response of cracked blade under different crack parameters was numerically simulated by using Runge–Kutta algorithm in MATLAB, and the frequency spectrum of the vibration response was analyzed. Taking the amplitude ratio of the second harmonic and the first harmonic as the crack characteristic parameter, the effects of different crack depths, locations and angles on the blade vibration characteristics were obtained. Finally, through the blade vibration test, it was verified that the crack characteristic parameter can be used to distinguish the healthy blade from the cracked blade, so as to achieve the purpose of blade crack damage identification.KeywordsBladeBreathing crackNonlinear vibrationNumerical simulationCrack characteristic parameter
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