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| Stability-ensured topology optimization of geometrically nonlinear boom structures |
| LI Wen-jun, ZHOU Qi-cai, WU Qing-long, XIONG Xiao-lei |
| School of Mechanical Engineering， Tongji University， Shanghai 201804， China |
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Abstract The boom structure is a key component of boom cranes, and the stability-ensured topology optimization is critical to its lightweight design. The sensitivity-based methods are not applicable for topology optimization of large-scale structures since they are labor-intensive and time-consuming. The quantitative indices of global stability and compression member stability for boom structures were defined. The anti-buckling mechanism of boom structures was analyzed to get the freezing order of associated web members. A novel SSKO (stability-ensured soft kill option) method was proposed, which was a topology optimization method for boom structures on the basis of the SKO (soft kill option) method for bars structures. This method was applied to topology optimization of a frame and a ring crane boom to demonstrate that it could achieve stable topologies with high efficiency.
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Received: 10 June 2014
Published: 28 October 2014
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几何非线性臂架结构稳定拓扑优化
臂架结构是臂架起重机的关键部件，实现结构稳定的拓扑优化对其轻量化设计至关重要. 基于敏度分析的结构优化方法耗时耗力，不适用于大型工程结构. 在杆系结构SKO （soft kill option） 法的基础上，定义了臂架结构整体稳定性和局部压杆稳定性的定量化指标，分析臂架结构抗失稳机制,给出了关联腹杆“冻结”顺序，提出了一种保证结构稳定的臂架结构拓扑优化方法，即SSKO （stability-ensured soft kill option） 法. 将该方法应用于刚架柱和环轨起重机组合臂架的拓扑优化中，结果表明SSKO法可实现结构的稳定拓扑，优化速度快,效果显著.
关键词：
几何非线性,
臂架,
SSKO,
稳定性,
拓扑优化
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