QQ客服 官方微博 反馈留言

题名	空间微振动模拟器设计研究
作者	石柱
学位类别	硕士
答辩日期	2014-11
授予单位	中国科学院大学
导师	陈立恒
关键词	空间微振动 Stewart 动力学建模 构型优化 结构设计
学位专业	机械制造及其自动化
中文摘要	随着空间光学遥感器通光口径的不断增大和分辨率的不断提高，空间飞行器上的运动设施产生的微振动会极大的降低光学遥感器的成像质量，对光学载荷进行隔振是提高光学系统成像质量的最有效、最直接的办法。设计出更为简单、有效、可靠的用于空间光学载荷隔振的隔振系统，需要对空间微振动的特性进行深入研究及对隔振系统的性能进行充分的试验验证。因此设计一种可靠性强、准确度高的空间微振动模拟器具有重大现实意义。 本文设计的微振动模拟器基于Stewart平台。首先介绍了Stewart平台的基本理论，给出了运动学逆解的求解方法和计算过程；利用计算多体系统动力学的基本知识分析了机构上平台广义速度与单腿伸缩速率之间关系，引出速度雅克比矩阵的概念；根据虚功原理分析上平台的广义力和各个支腿的激励力之间的关系，得到系统的广义刚度与广义阻尼矩阵；利用牛顿-欧拉公式推导出在不考虑重力的情况下系统的动力学方程；以系统的固有频率为研究对象，忽略科氏力和向心力以及单腿阻尼的影响，将模型简化得到了系统作无阻尼振动的微分方程，并基于此得到了系统固有频率的计算公式。 结合空间微振动模拟器的性能指标，主要是包络尺寸及激振频率范围，提出一种系统构型优化的思路并依此得出系统的最优构型参数。建立最优构型下机构的有限元模型并比较系统固有频率的仿真值与理论解析值，验证了理论的准确性。在构型确定后，根据模拟器的激振频率与输出力范围得出支腿的性能要求，依此对单腿进行设计。选用万向柔性铰链作为机构关节，研究了万向柔性铰链各向刚度特性与其结构参数的关系，并对柔性铰链进行优化设计。 本文详细介绍了空间微振动模拟器构型优化和柔性铰链优化设计过程，并根据优化得到的构型以及铰链结构对模拟器进行设计。然后对单腿的结构设计作了完善阐述并通过实验对单腿性能进行研究，结果显示性能良好。
英文摘要	Motion facilities on space spacecraft will pass vibration to optical remote sensor, which will influence the accuracy greatly. Studying the influence of the vibration isolation is of great significance. To get more effective space micro vibration isolation technology, we need to take full test of the space vibration on ground, which demands a structure of high reliability and accuracy to simulate space micro vibration simulation. The space micro vibration simulator is based on parallel Stewart platform. Firstly the basic theory of Stewart platform is introduced and math modeling is done, and then the solution method and the calculation process of the inverse kinematic is shown. Using the related formula on mechanics and multi-body dynamics, detailed deduction of adjustable speed relations solving process is made for the platform leg, raising the concept of Jacobi matrix. The relationship between exciting force and the generalized force is obtained according to the principle of virtual work, as well as the generalized stiffness and damping matrix of the system. Then we deduce the complete system dynamic formula of the mechanism without considering gravity according to the Newton - Euler equation. As for the natural frequency of the mechanism, ignoring the coriolis force and centrifugal force and damping, the complete system dynamic formula is simplified as the differential equations for the undamped vibration model, which equals the calculation expression of the natural frequency. Considering the micro vibration space simulator performance indicators, which mainly means the envelope size and vibration frequency range, the optimization method of the system configuration is obtained. The optimal configuration of the system parameters is got based on inherent frequency calculation formula, and we compare the analyzing result of the natural frequency value of the configuration in optimal configuration with the simulation result, which is relied on a finite element model through Patran/Nastran. Then the performance requirements of the leg are obtained and so is the design indicator. We selected the universal flexible hinge as the joints of the mechanism. The stiffness characteristics on structure parameters is studied for the universal flexure hinge, and taking the mechanism performance and strength demand into accout, the opimal parameter is finally gained. Configuration optimization and optimization design processes of the flexible hinge are given clearly, and the optimization result shows the natural frequency, stiffness characteristics and strength characteristics are in best situation. We make detail description of structure design for the leg and take some test to study the performance of one leg, whose results is of positiveness.
语种	中文
内容类型	学位论文
源URL	[http://ir.ciomp.ac.cn/handle/181722/44683]
专题	长春光学精密机械与物理研究所_中科院长春光机所知识产出
推荐引用方式 GB/T 7714	石柱. 空间微振动模拟器设计研究[D]. 中国科学院大学. 2014.

个性服务

查看访问统计

相关权益政策

暂无数据

收藏/分享

除非特别说明，本系统中所有内容都受版权保护，并保留所有权利。