| Tower cranes are widely used in building construction due to their large working radius,compact structure and excellent lifting performance.The working process of tower crane requires the lifting mechanism,luffing mechanism and slewing mechanism to cooperate with each other to complete the transportation of materials,the resulting alternating load will cause the metal structure vibration and accelerate the fatigue damage of the steel structure.This thesis combines the structural characteristics of the tower crane,the dynamic characteristics of the mechanism and the vibration characteristics of the structure,and uses the C# programming language for the secondary development of ANSYS software to establish a parametric modelling platform for the tower crane.The influence of the dynamic parameters on the vibration response of the machine structure under different operating conditions is analysed.The main research contents of this thesis are as follows:(1)Based on the structural characteristics of tower cranes,mechanism dynamics characteristics and structural vibration characteristics,the general design of the parametric modelling platform for tower cranes is proposed,and based on this,Visual Studio software and ANSYS software are selected as the development tools of this platform,and through the interface program between Visual Studio software and ANSYS software,the Through the interface program between Visual Studio software and ANSYS software,the data communication and memory sharing between the parametric modelling platform of tower crane and ANSYS software are realized,and a parametric modelling platform of tower crane which can be modelled quickly and automatically carry out solution calculation and extract analysis results is established.(2)According to the functional requirements of the parametric modelling platform for tower cranes,the Win Form form in Visual Studio software is used as the design platform for the visualisation interface,and the C# programming language is used to transfer the feature parameter data entered by the user in this interface to the command flow template file to be called.The APDL language is used to establish the parametric model of the tower crane and to complete the parametrization of the structural dimensions of the tower crane,the parametrization of the cross-section and the parametrization of the working conditions,so that the user can complete the whole process of finite element analysis of various models of tower cranes under different working conditions within the platform.(3)Apply the tower crane parametric modelling platform to QTZ5513 tower crane modal analysis,extract the first six orders of the tower crane inherent frequency and vibration pattern.The transient analysis of the QTZ5513 tower crane is carried out by applying the tower crane parametric modelling platform.The moving load method is used to simulate the movement of the cargo on the lifting arm,and the vibration response of the tower body and lifting arm under the lifting condition,the variable amplitude condition and the slewing condition are obtained respectively,and the influence law of the cargo weight and cargo position on the vibration response of the whole structure is analysed.The analysis results show that the weight and position of the cargo are positively correlated with the vibration response of the whole structure,the greater the weight of the cargo and the farther the cargo position is from the center of rotation of the tower,the greater the vibration amplitude and vibration period of the whole structure. |
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