Design and vibration control of aeroengine bracket with variable stiffness based on shape memory alloy

The aeroengine bracket is a vital connector, which plays a key role in supporting and transmitting loads. In this paper, a bracket with variable stiffness for vibration control of aeroengine accessory is designed. Firstly, the topology optimization for the initial model of the aeroengine bracket is carried out, and the quality of the bracket was reduced by 84.78% while meeting the strength requirements. After that, part of the material of the bracket was replaced by shape memory alloy (SMA) to design the bracket with variable stiffness. It is found that with the increase in temperature, the stiffness of the designed bracket with variable stiffness increases by about 36%, and maximum von Mises stress and deformation of the bracket have decreased. Finally, the integrated modeling of aeroengine casing-bracket-accessory is carried out. Under single and coupled fault frequencies, the amplitude of the accessory is reduced by 57.5% and 63.1%, respectively. The frequency sweep at different temperatures shows that as the temperature increases, the resonance frequency changed from 74.6 Hz to 89.1 Hz and the resonance peak amplitude decreased by 17.7%.