摘要
定轴平台支撑架是用于定位、支撑准直光源模块,支撑架的结构稳定性直接决定和影响着仪器本身的动静态精度和检测精度。先对定轴平台的底座和支撑架进行静态力学分析,建立有限元分析三维CAD模型,通过有限元法分析底座和支撑架在载荷下的变形量对装置精度的影响。然后根据结构模态理论,构建支撑架动态振动模型,分析其不同阶次的振动模态频率。考虑对定轴平台固有模态频率要求,改进支撑架结构,分析改进结构后不同阶次振动模态频率。对比支撑架前后不同结构的模态频率,结合装置实际工作环境,以决定采用合适的支撑架结构,从而满足定轴平台工作稳定性要求。
An axis-fixed platform supporting frame is used for locating and supporting the alignment illuminant module used by detection, its structure stability directly determines and affects the dynamic and static accuracy and precision of instruments. Firstly, the static mechanics of the base and supporting frame for an axis-fixed platform was analyzed, and a finite element analysis 3D model was built. Using the finite element method, the influence to accuracy of the equipment was analyzed, which is caused by the deformation of the base and supporting frame under the loads. Then, according to the structural modal theory, supporting frame dynamic vibration model was constructed, and its different time vibration model frequency was analyzed. Considering for the axis-fixed platform inherent modal frequency requirements, the supporting frame＇s structure is improved, this new structure different time vibration modal frequency was analyzed. Comparing the modal frequency of the initial supporting frame structure with the improved supporting frame structure, and combining with the actual working environment, the appropriate supporting frame construction was adopted to meet an axis-fixed platform working stability requirement.
出处
《现代科学仪器》
2011年第2期7-11,共5页
Modern Scientific Instruments
基金
国家自然科学基金委员会与中国工程物理研究院联合基金资助
项目编号:10976034
关键词
定轴平台
支撑架
有限元
模态
稳定性
An axis-fixed platform
Supporting frame
Finite element
modal
Stability
