Damage Detection for Rotating Beams by Using Auxiliary Mass ApproachCombined with Fractal Dimension Method

Abstract

Rotating beam structure is widely used in the aerospace engineering field. Its health status is directly related to the flight safety of the aircraft. Damage detection of the rotating beam structure can detect the damage in time so as to avoid heavy losses due to structural damage. Taking variable-section rotating cracked beam as an example, the damage identification is based on auxiliary mass method combined with fractal dimension theory. Firstly, the mass-crack beam model is established, and the natural frequency curve is calculated with the mass position changing. Then the fractal dimension curve of natural frequency curve is obtained by using fractal dimension method, and the location and depth of the crack can be detected. Finally, the effects of crack position, crack depth, auxiliary mass and rotating speed are investigated in detail. The simulation results demonstrate the efficiency and accuracy of the proposed method.

Keywords

• rotating cracked beams
• auxiliary mass method
• fractal dimension
• damage detection