Optimum Structural Designs for an Equipment Cabin under High-Speed Train Considering Aerodynamic Load

摘要

Equipment cabin under a high-speed train is a kind of structure for protecting the suspension equipments and reducing the air resistance when a train runs. With the increase in speed of a train, the issues related to safety like the structural strength, structural stiffness, weld fatigue etc. must be considered in the design of the high-speed trains. At the same time, the aerodynamic action caused by high speed must be considered. In this paper, optimum structural designs are implemented for a typical equipment cabin where two Doppler radar velocimeters hang. First, the topology optimization for the frame ribs is implemented with the stress and displacement constraints. After the topology optimization, the detailed size optimization is carried out to minimize the total weight. To obtain all the responses, finite element model of the equipment cabin is analyzed under aerodynamic and acceleration loads. The optimization results show the weight is reduced about 8%.