基于反馈近似损伤的振动加速激励设计方法

The method for formulating the high-acceleration profiles for electromechanical products has some problems, such as unclear correlation between key element of profile and excitation failure mechanism, low fault excitation efficiency, and high testing costs. To establish a correlation mechanism between the cumulative damage and the key elements of vibration test profile, a vibration acceleration excitation design method based on feedback approximate damage is proposed. The refined design of vibration test profile is achieved through the dynamic control of damage increment. By integrating the analysis of vibration damage mechanism and the frequency-domain analytical technology of power spectral density, the mapping relationship between vibration excitation and cumulative damage is quantified, and a vibration excitation-damage corresponding model (CM-VED) is established. The validity of the proposed method is verified by taking the high-acceleration step vibration test of a fuse as an example. The research findings indicate that the obtained high-acceleration vibration test profile enhances the excitation accuracy of failure limit by 60% compared with the standard fixed-step method, and the time is shortened by 33. 33% compared with that of the equal division method while ensuring high excitation accuracy. The proposed CM-VED can provide a theoretical basis for establishing the correspondence between excitation and damage. The proposed vibration acceleration excitation design method based on feedback approximate damage can reduce the test cost while guaranteeing the excitation accuracy, providing technical support for the design of the high-acceleration vibration test profile of electromechanical products.