摘要
在前人所设计的环形方案的基础上,提出了一种空间占用量小,并且可以实现真正意义上的空间三维运动的框形方案。对两种方案的空间占用量进行了对比,证实框形方案更优。以该方案为研究对象,针对其结构特点,以旋转框架1为例,建立了有限元分析模型。根据实际工作情况,对模型刚度最差的的位姿进行了静力分析。对模型进行了模态分析,提取了前四阶固有频率及振型图。根据静力学和模态分析的结果对旋转框架进行了多目标多尺寸的优化设计。对优化后的模型再次进行有限元分析,结果表明优化后的结构其静动态特性有了明显的改善。以相同的优化方法对底座和旋转框架进行优化,并给出了优化的结果。
On the basis of the predecessors＇ design scheme of annulus,the frame scheme is raised,which has smaller space usage and can promise real three-dimensional spatial movement. The comparison of the space usage of two schemes proves that the scheme of frame is more optimal. The frame scheme is taken as the object of study and the rotation frame 1 is taken as an example to establish the finite element model based on the structural feature. The static analysis is performed on the rotation frame 1 in the pose with the worst stiffness that is based on actual word condition. Modal analysis is taken with the first four inherent frequencies and vibration models. Multi-objective and multi-parameter optimization is taken according to the result of static analysis and modal analysis. Comparing with the analysis results of original modal via finite element method,we improve greatly the dynamic and static characters. The optimization results of pedestal and rotation frame 2 are provided with the same method.
出处
《机械科学与技术》
CSCD
北大核心
2016年第8期1176-1182,共7页
Mechanical Science and Technology for Aerospace Engineering
基金
国家自然科学基金项目(51375329)资助
关键词
有限元分析
模态分析
固有频率
优化设计
finite element method
modal analysis
inherent frequencies
optimization
