A structure dynamic model updating method for random vibration fatigue
life prediction
- Tao Wu,
- Weixing Yao
, - Ziran Xu,
- Chao Xu,
- Jie Huang
Weixing Yao
![](https://d197for5662m48.cloudfront.net/assets/icons/omniauth/orcid-ca37582cd91a671ed5cec57770e0e96c01b4b79b8b5b75d8598fc1ddac18c974.svg)
Nanjing University of Aeronautics and Astronautics
Author ProfileZiran Xu
Shanghai Electro–Mechanical Engineering Institute
Author ProfileChao Xu
Nanjing University of Aeronautics and Astronautics College of Aerospace Engineering
Author ProfileJie Huang
Nanjing University of Aeronautics and Astronautics College of Aerospace Engineering
Author ProfileAbstract
In order to overcome the low precision of vibration fatigue life
analysis of complex engineering structures, a structural dynamic model
updating method for random vibration fatigue life prediction was
established. In this model updating method, the stiffness and modal
damping of key parts such as structural connection are extracted as
model modification parameters. The approximate model of modified
parameters and target is established to replace the finite element model
of complex structure based on the Kriging method. The actual natural
frequency and random vibration response spectrum of the structure are
taken as the modified objectives to design the optimization experiment
and find the optimal model parameters. And based on the amplitude
probability density method of random vibration fatigue life analysis,
the vibration fatigue life of complex structure is obtained. Finally,
the method is verified by structural dynamic experiment. The result
shows that the method can effectively modify the parameters of dynamic
finite element model for the prediction of structural vibration fatigue
life, and improve the accuracy of structural random vibration fatigue
life prediction.