Structure Characteristics And System Virtual Simulation Of Large Gantry Crane

The gantry crane is generally a complex mechanical system with components of structure and machinery. Metal structure is an important part of the crane whose research and design is important in the design process. Mechanical system is the basis of function realization and has a greater impact on the performance of machine. With the continuous and efficient development of giant crane, its overall performance is getting more and more concerned. Taking the2000t large gantry crane designed for the beam field of Zhuhai-Hong Kong-Macao Bridge for example, this paper gave a thorough analysis both in structural characteristics and structural movement with the help of large-scale finite element analysis software ANSYS and multi-body dynamics analysis software ADAMS. The main contents are as follows:1. Static analysis of2000t gantry crane using ANSYS. This paper carried out a detailed analysis and calculation of the reference value of main beam, pre-bias of the rigid legs, stiffness of the main beam, the overall static strength, asynchrony conditions of the pre and post wheels, storm conditions, and test conditions. The results show the model meets the design requirements of both static strength and static stiffness.2. Modal analysis of2000t gantry crane using ANSYS. The natural vibration frequencies and mode shapes were obtained by studying and contrasting the modal parameters of no-load conditions, full load conditions, and under pre-stress conditions. The results show that influence of the loaded stress while working on structural dynamic characteristics can be neglected. Effects of hoists to modal parameters were also discussed.3. Wind-induced vibration and wind-induced pressure distribution characteristics research of2000t gantry crane using ANSYS. In this paper, Davenport Power Spectrum is used to simulate the timing of random wind load, including both speed and pressure curve. Wind load factor of the system is obtained using ANSYS transient dynamic analysis; the structural shape coefficient and air pressure uneven distribution coefficient were obtained after wind farm simulation of the crane using ANSYS CFX.4. Seismic characteristics study of2000t gantry crane using ANSYS. Three methods, equivalent static load analysis, response spectrum analysis and transient kinetic analysis, were used to study this characteristic. Results of the first two methods are relatively close but the ones with response spectrum turn to be a little bigger. Results of the transient analysis are much larger than the ones of the first two. The results showed that there needs a transient analysis in order to draw more accurate results of the seismic response.5. Virtual simulation of2000t gantry crane using ADAMS. Seven different working conditions were simulated. Reaction force and wheel pressure curve were then obtained. Results show that the control accuracy and performance have a greater impact on the structural dynamic characteristics.The content and results of this study can provide some reference for the study of the dynamic characteristics as well as some guidance in the design progress of the large gantry crane.