关键词: 前中盾, 有限元分析, 拓扑优化, 尺寸优化, Kriging模型

Abstract: The front and middle shield was an important part of shield machines. Because of the large structural size and complex service environment， it was very important to carry out lightweight design on the premise of ensuring structural strength. Aiming at the front and middle shield of a slurry balance shield， a lightweight design method was proposed herein based on topology optimization and size optimization. Firstly， topology optimization was used in the front and middle shield structural design， and secondary design was carried out based on the topology optimization results. Then， the size optimization model of the front and middle shields was built after the secondary design， where the structural parameters that had great impacts on the mass， maximum deformation and maximum stress of the front and middle shields were selected as design variables by orthogonal experiment and analysis of variance. The optimal Latin hypercube design and finite element analysis method were used to obtain 45 groups of sample points， thereby a Kriging agent model with design variables-performance responses implicit relation were constructed. Finally， the size optimization model of the front and middle shields was solved by the sequential quadratic programming（SQP） algorithm， and the optimal size parameter groups were obtained. The verification results show that， the mass of the front and middle shields decreases by 30 t（with a drop of 3.1%）after topology optimization and size optimization. 

Key words: front and middle shield, finite element analysis, topology optimization, size optimization, Kriging model