黄昌雄, 陈耕, 黄松华, 张乐乐. 基于SIMP−安定的高速列车组合式座椅底架轻量化设计与分析[J]. 工程科学学报. DOI: 10.13374/j.issn2095-9389.2023.05.05.002
引用本文: 黄昌雄, 陈耕, 黄松华, 张乐乐. 基于SIMP−安定的高速列车组合式座椅底架轻量化设计与分析[J]. 工程科学学报. DOI: 10.13374/j.issn2095-9389.2023.05.05.002
HUANG Changxiong, CHEN Geng, HUANG Songhua, ZHANG Lele. Lightweight design and analysis of a combined seat bracket for a high-speed train based on SIMP−shakedown[J]. Chinese Journal of Engineering. DOI: 10.13374/j.issn2095-9389.2023.05.05.002
Citation: HUANG Changxiong, CHEN Geng, HUANG Songhua, ZHANG Lele. Lightweight design and analysis of a combined seat bracket for a high-speed train based on SIMP−shakedown[J]. Chinese Journal of Engineering. DOI: 10.13374/j.issn2095-9389.2023.05.05.002

基于SIMP−安定的高速列车组合式座椅底架轻量化设计与分析

Lightweight design and analysis of a combined seat bracket for a high-speed train based on SIMP−shakedown

  • 摘要: 在高速列车座椅轻量化设计中,传统设计方法所普遍采用的结构优化技术仅以结构刚度或局部应力水平为目标,无法得到交变载荷作用下效率最高的结构构型. 列车座椅在实际使用中受到轨道与应用场景的影响,除主结构需具备一定强度外,其关键部件也要求在交变载荷作用下不发生明显变形. 在此背景下,提出了一种采用固体各向同性惩罚微结构插值 (SIMP) 算法对主结构进行以刚度为目标的拓扑优化,同时以安定直接法对关键部件进行以安定强度为目标的参数优化一体化的设计与分析方法. 采用所提出的方法对高速列车组合式座椅底架进行了优化,取得了显著成果. 优化后的座椅底架在性能满足要求的前提下,底架主结构减重17%、L型连接件承载交变载荷的结构效率提高23%. 所提出的研究方法及结果对于同类结构的轻量化设计具有重要意义.

     

    Abstract: Next-generation high-speed trains are required to achieve higher speeds, enhanced safety, environmental friendliness, and cost-effectiveness. To meet these technical goals, reducing the structural weight to a certain extent is crucial. A standard seat has the following six components: a backrest, a seat cushion, two side and middle armrests, a rear pedal joined with front and rear tables, and a seat bracket. Among these components, the seat bracket, which connects the seat to the carriage, acts as the main load-bearing structure. In the current lightweight design of seat brackets in high-speed trains, the traditional approach is based on structural optimization techniques, often size or shape optimization, with the goal of achieving a desired global stiffness or local stress level, and the optimized structural configuration does not have the best performance under time-varied loads. Thus, it would show a conservative approach, inefficient material utilization, and difficulties in achieving an increasingly stringent lightweight design. On the one hand, the seat bracket’s main structure must have sufficient strength; on the other hand, the key components must not deform substantially under alternating loads because the work conditions under the operation are affected by the track and the application scenarios. Motivated by this, we propose a design and analysis method that integrates SIMP (solid isotropic microstructure with penalization) based topology optimization and direct method (DM) based parameter optimization techniques, where the former applies to the main structure and considers maximizing structural stiffness as a design objective with a prescribed volume fraction constraint and the latter applies to key components, that is, the L-shaped connector, and considers the shakedown limit as the design objective, where the corresponding parametric model is developed and the optimal result is obtained by the genetic algorithm (GA). Using this method, the main load-bearing pathway can be determined and geometric reconstruction design can be performed based on this pathway for the main structure. Compared with the original design, a weight reduction of 17% of the optimized assembled seat bracket is achieved for high-speed trains while ensuring that the mechanical performance meets the requirements. For DM-based parameter optimization design, the load-bearing capacity of the shakedown is increased by 7.8%, and structural efficiency is improved by 23%, with a 12.5% reduction in the material of the L-shaped connector. This study may provide valuable guidance for the lightweight design of similar structures under repeated variable loadings.

     

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