Modeling And Simulation Research On Swing Characteristics Of Bridge Crane Hook

Cranes are widely used in nuclear power and wind power installation,major bridge and tunnel projects,port terminals,aerospace and other fields.The coupling action of the flexible member and the winding device in the hoisting mechanism of the crane makes the rocking characteristics of the hook become complex and changeable,and the contact winding between them makes the wire rope and pulley system become a complex rigid-flexible coupling multibody system.Take the bridge crane as an example,when it works,the cart and trolley need to start and brake frequently,and under the action of inertia,the hook or liftin g will sway to a certain extent.Which will affect the accurate positioning of hoisting operation and seriously reduce the loading and unloading efficiency,and bring hidden dangers to production safety.Therefore,it is necessary to study its rocking characteristics under various working conditions and master its law.In this paper,the prototype model of bridge crane is established through virtual prototype technology and the swing characteristics of the lifting weight under different working conditions are analyzed.Firstly,aiming at the lifting mechanism of bridge crane,the dynamic mathematical models of lifting swing in two-dimensional and three-dimensional space are established in this paper.The two-dimensional swing of crane is modeled and simulated by using the Simulink module of MATLAB software,and the swing angle-time curve under different driving force,pendulum length and lifting mass is obtained.Secondly,the dynamic simulation model of crane is established in the dynamics software RecurDyn by using virtual prototyping technology.Taking the wire rope winding system of the triple hoisting mechanism of the general bridge crane as the research object,the flexible body model of the wire rope system is established by using the finite element flexible body(F-Flex)method,and the constraint and drive are added to simulate the motion under various working conditions.By comparing and analyzing the simulation results,it can be concluded that the maximum load swing deviation is the emergency stop condition,followed by the complete operation condition.When the acceleration of the large and small vehicles is fixed,different lifting weights have no effect on the load swing.As the length of the pendulum increases,the swing deviation of the lifting weight in the space is also greater.Then the theoretical analysis of this paper is compared with the model simulation to further verify the reliability of the prototype model.Finally,the experimental plan of the lifting swing test was designed,and the experimental platform was set up for the structural parameter setting and the calculation of the selection of the motor,reducer,and frequency converter.The sensors of the motion state variables such as the lifting weight swing angle,lifting and landing speed,the speed and acceleration of cart and trolley are selected.The actual data measurement and collection are carried out through the sensor,and the reasons for the difference between the analysis and the prototype model are studied and corrected accordingly.