A New Design Method for Equivalent Stiffness of Vibro-impact Absorber
This article investigates an aviation power control unit,focusing on analyzing its response to ac-celeration in three shock directions.The analysis demonstrates that the component's failure results from surpassing the acceleration limit.To mitigate the shock response effectively,a novel stiffness design meth-od is proposed for the vibro-impact absorber.Initially,a single degree of freedom mass-spring system is established based on the vibration isolation system to compute the theoretical solution of shock excitation.Employing Matlab and Simulink for co-simulation,a transmission rate curve of shock response is genera-ted with respect to the frequency ratio,facilitating the selection of frequencies that meet the desired trans-mission rate.Subsequently,the impact of three-dimensional stiffness coupling characteristics on the pri-mary vibration frequency is explored via finite element modal analysis.Finally,an optimal stiffness design scheme for the vibro-impact absorber is derived,which achieves a balance between the target transmis-sion rate and system stability.This method significantly enhances the efficiency of stiffness design for the vibro-impact absorber.1)For a target transmission rate βmaxof 0.9,the system's main frequency should be designed at either 25.33 Hz or 109.7 Hz,as indicated by the βmax-R curve;2)The system can meet the target transmission rate while optimizing integral rigidity when setting the three-dimensional stiffness val-ues of the vibro-impact absorber to X=Z=50 N/mm and Y=663 N/mm.
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