Model Updating of Hydraulic Heavy-Duty Manipulator Under Gravity
While a hydraulic heavy-duty mechanical arm operates,the pre-stress resulting from gravity has a significant hardening on the structural dynamic characteristics' stiffness.Therefore,a modal analysis method that accounts for pre-stress stiffness-hardening and a finite element model updating method based on radial basis func-tion meta-models are being implemented and studied.Taking a hydraulic heavy-duty mechanical arm as the re-search object,the finite element model of the overall structure and the meta-model of pre-stressed modal fre-quencies have been established.The structure's model updating process is grounded in the global optimization al-gorithm,and the strain response prediction is conducted based on the updated model to verify the prediction abil-ity of the model.The results show that the proposed method not only significantly improves the ability of the model to replicate the updated response but also can accurately predict the response of the un-updated model,thereby validating the method's feasibility.The method provides an accurate dynamic model for the structural op-timization and automatic control of heavy-duty mechanical arm.
NETL
NSTL
万方数据
维普
