Crawler Crane Superstructure And Chassis' Topology Optimization

Superstructure's reasonable structure optimized design, which makes that material has maximum efficiency, not only can reduce the weight of superstructure, but also can provide engineering design reference. Usually, the crawler cranes need to be able to meet the requirements of different operating conditions, corresponding crane turret also need so. However, if each working condition of superstructure is analyzed, not only there are many conditions, also it's not conducive to optimizing efficiency. Taking a model of crawler crane superstructure for the study and by the forces analysis of superstructure to determine its dangerous working conditions, the range is reduced to optimize the three kinds of dangerous working conditions. Then the turret structure topology optimization is completed based on variable density method, and the improvement program for superstructure is proposed and the check of the improved turret is completed. Meanwhile, there is more research on topology optimization in discussion of plane problems than topological optimization of spatial structure, which is more difficult. Based on the superstructure plane topology optimization, the topology optimization of chassis structure's stiffened plate layout is completed. Then, structure optimized is to be checked. Topology optimization has more extensive application. The main works of the dissertation are as follows:(1) Analyzing the force characteristics of the superstructure, then according to the superstructure's stress in different conditions, dangerous working conditions of turret are judged. Finite element static analysis of superstructure is performed on dangerous conditions by ANSYS, whereby topology optimization area is selected.(2) According to the variable density method, and the mathematic model based on SIMP interpolation model has been set up. What's more, optimal parameters are determined to complete a single operating mode topology optimization analysis of the superstructure, and the results are analyzed. Then based on the SIMP material interpolation schemes, the multi-conditions topology static optimization mathematical of turret is established by using weighted sum. And according to the strength and stiffness of the superstructure, weighting factor is obtained by using the normalization method. Then comparative analysis, a more reasonable weight factor is chosen which is used for the multi-conditions topology optimization analysis.(3) According to the multi-objective conditions topology optimization results, a new turret structure is proposed and then the improved turret structure is designed. The improved turret structure's analysis shows that superstructure weight is reduced by 7% and the mechanical properties of the premise of the superstructure can be ensured. That is to say, it can reduce the weight and achieve the purposes of optimization.(4) Analyzing the force character of chassis, and establishing optimization model of chassis stiffened plate. According to the actual situation of chassis, completing the multi-conditions topology optimization, optimize the layout of the space stiffened plate. After optimization, chassis stiffened plate weight reduce 39.7%, and the total mass of the chassis to reduce the 6.2%. It can reach that two-dimensional topology optimization turns on steering space applications, while optimizing the structure be checked after optimization.