Design and topology optimization of air conditioning suspension bracket for metro

Abstract

During the operation of subway vehicles, the vibration of air conditioning units is mainly transmitted to the vehicle body through the suspension support, which seriously affects the stability and comfort of the vehicle during operation. Therefore, the design and optimization of the suspension support of air conditioning units has become a hot topic in the research of the dynamic characteristics of subway vehicles. In this paper, the rigid and flexible coupling dynamic model of metro is firstly calculated to simulate the stress of the suspension point of air conditioning of the vehicle body when the vehicle is running. The initial structure design of the suspension support is carried out, and the stress of the air conditioning suspension point is taken as the load input to analyze the stiffness and strength of the initial structure of the suspension support. Then, the fatigue life is taken as the topology constraint, and the variable density method (SIMP) is used to optimize the topology of the suspension bracket. Finally, the optimized suspension support is validated. The results show that after topological optimization, the maximum displacement and maximum stress of the suspension support under vertical, horizontal, and vertical loads are reduced by 80%, 93%, and 99%, respectively, compared with the original structure model, and the maximum stress under vertical loads is reduced by 50%.

Lightweight design of a steering power cylinder bracket

“…Studies have shown that every 10% reduction in vehicle mass, fuel consumption can be reduced by 6%–8%, and exhaust emissions will be reduced by 5%–6%, which achieves the effect of energy saving and emission reduction and promotes the development of automobile lightweight to some extent. 1 At present, the main ways to achieve lightweight usually include structural optimization, 2–9 new materials, 10 and new processes. 11 Among them, Liang et al 2 optimized the structure of a gearbox under multiple load conditions, and the results showed that the mass of optimized gearbox was reduced by 7.6% compared with the initial model, the strength and stiffness were not weakened, and the first and second-order natural frequencies increased about 4.1% and 5.0%, respectively.…”

Research on Optimization of Structural Parameters of Equipment Cabin Bottom Cover

“…Nowadays, there has been in-depth research on the optimization method of structural parts [5]. e authors in [6][7][8][9][10][11] separately optimized the structure of energy-absorbing structure, carbody structure, and the subway vehicle air-conditioning suspension.…”