Structural Analysis And Optimized Design Of Shield Cutterhead In Sandy Cobble Stratum

As an advanced special equipment for tunnel construction,the shield machine,which is widely used in the infrastructure construction of railway,subway and highway,has the characteristics of fast driving speed,high efficiency,low labor intensity of construction,high safety and not easy to be affected by external conditions.As a key component of the shield machine,the shield cutterhead directly affects the efficiency of tunnel construction and the service life of the shield machine.Due to its complicated structure,a lot of time and effort in the process of design and analysis have been wasted.Therefore,with an aim of improving the efficiency in the design of the shield cutterhead,the paper studies the integrated technology of structure design and force analysis of shield cutterhead,in order to establish a set of design and analysis system of parametric shield cutterhead.Taking the shield cutterhead structure under the working conditions of sandy cobble stratum as the research object,a technical scheme for automatically constructing the numerical model of finite element analysis of shield cutterhead is proposed,and the automatic analysis and automatic optimization of parametric model are explored.Firstly,without changing the structure and characteristic size of the cutterhead,the rules of model simplification and model evaluation of shield cutterhead are established,and the objective model for structural analysis and structural optimization is created.The automatic simplification and evaluation of shield cutterhead in sandy cobble stratum is achieved by the secondary development function of SolidWorks;secondly,according to the design criteria of the shield cutterhead,combined with the force state of the shield cutterhead under the working condition of the sandy cobble stratum,the stress state without considering the force of cutter,the force before the tool wears and the force after the tool wear are compared and analyzed,and the optimal method of calculation of the various loads and loads on the shield cutterhead under the corresponding working conditions are obtained.Thirdly,the automatic interface between SolidWorks and ANSYS is achieved by C#,and the geometric model of shield cutterhead and model of finite element analysis are effectively combined to establish a system of integrating parametric model and finite element analysis.Fourthly,through structural analysis of the finite element parametric model,the area of stress concentration of the shield cutterhead and the location of maximum stress and maximum displacement of the shield cutterhead are found out,and the optimized variables of the parametric model are extracted and optimized.Fifthly,the data communication of structure design,the model simplification,the finite element analysis and the structure optimization of the shield cutterhead are achieved by technical development,and a set of analytic system of parametric shield cutterhead is integrated.The integrated analytic system of parametric shield cutterhead shows that the user can input the shield engineering parameters to complete the structural design of the entire shield cutterhead,and achieve automatic construction,automatic analysis and automatic optimization of the model of finite element analysis.The analytic system of parametric shield cutterhead constructed in this paper solved the complicated,time-consuming and laborious problems in the process of traditional structure design,analysis and optimization to a certain extent,effectively shortening the development cycle of the shield cutterhead.At the same time,the research work has a certain role in promoting the establishment of the integrated technical system of design and analysis of complex products.