Dynamic Simulation Of Wind Power Crane Based On Rigid-flexible Coupling Model

Wind power crane,as the main lifting equipment installed by fans,provides a great help for the construction of wind farm.At present,the research on wind power crane is mainly based on the multi-rigid-body dynamics theory,and the research method is mainly statics.These methods have data limited reference value.Virtual prototype technology is a new design method of the mechanical design fields,the coupled multi-body system dynamics is the new beacon of multi-body system development,in order to better analyze the wind power crane of different operation condition,the paper using virtual prototype technology and the coupled multi-body dynamics to dynamic analysis of wind power crane is studied.Boom in the wind power crane movement process,the force is more and the range of operation is large,the structural characteristics of the wind power crane has a deep impact on the performance of the wind power crane,so in the wind power crane rigid-flexible coupling dynamics analysis,the boom as a flexible part of the analysis.This paper takes the practical research of QLY2150 type wind power crane as reference.The main research contents are as follows:(1)On the basis of multi-body dynamics theory,combined with the modeling theory of multi-rigid-body system and the modeling theory of multi-rigid-body system,on the basis of the existing rigid-flexible coupling modeling theory,the rigid-flexible coupling modeling method for wind power cranes was deduced.The modeling software SolidWorks is used to establish the complete crane model,and the modal neutral file of the boom is generated by ANSYS.The boom in the rigid body model is replaced by the neutral file to establish the rigid-flexible coupling model of the complete wind power crane structure.Meanwhile,it provides a method for the body flexibility of other complex rigid boom models.(2)According to the multi-body system dynamics theory,the dynamic load characteristics of the wind power crane boom in the movement of each mechanism are deduced,and the feasibility and accuracy of applying virtual prototype technology to the wind power crane are verified by combining the dynamics simulation analysis and research of each mechanism in the rigid body model of the wind power crane.(3)On the basis of the rigid body model research of the wind power crane,the dynamics simulation analysis of the rigid and flexible coupling model of the wind power crane was completed,revealing the influence law of the load characteristics of the flexible boom on the dynamic behavior of the unit.The stress distribution and law of the whole structure of the boom in the crane movement are shown by analyzing and summarizing the joint stress at the key position of the flexible boom,and the position and maximum stress of the dangerous node,as well as the time change course of the stress at the dangerous node are obtained,which provide a reference and basis for the design and optimization of the wind power crane.By means of virtual prototype technology,the influence of flexible boom on the dynamic behavior of wind power crane was analyzed,and the feasibility of virtual prototype technology applied to complex mechanical system was verified,which provided modeling method and data reference for future studies on rigid-flexible coupling of such machinery.