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题名	基于六维并联机构的空间多维微振动模拟器优化设计
作者	辛建
学位类别	硕士
答辩日期	2015
授予单位	中国科学院大学
导师	吴清文
关键词	空间微振动 Gough-Stewart 平台 动力学模型 固有频率 结 构设计
其他题名	Optimization design of space multi-dimensionalmicro-vibration simulator based onsix dimensional parallel mechanism
学位专业	机械工程
中文摘要	空间飞行器上搭载的多种设备，如制冷压缩机、太阳帆板转动机构、调姿 陀螺等，会产生微小振动。这些微小振动具有频带分布宽、幅值小、形式复杂 等特点，严重影响空间飞行器上光学遥感器的成像质量。常见的解决办法是对 光学遥感器进行隔振。为了评估飞行器上隔振系统的有效性，需要进行大量的 地面试验，而开展这些工作的前提是能复现这些微小振动的频谱特性。因此， 设计一台能复现具有不同频谱特性的多维微小振动的模拟器是一个具有重大意 义的课题。 首先，开展了基于Gough-Stewart 平台的空间微振动模拟器动力学特性的 研究。综合考虑了驱动腿和铰链的质量属性以及负载质心与上平台坐标系原点 不重合时的特殊情况，建立了Gough-Stewart 平台的完整动力学模型，推导了 求解微振动模拟器固有频率及主振型的数学解析式。通过有限元仿真及实验测 试对单个驱动腿的轴向刚度进行了研究。同时，采用理论方法及有限元方法对 第一代样机的动力学特性进行了仿真分析。对微振动模拟器的固有频率进行了 实验测试。仿真及测试结果显示：三种方法得到的固有频率及主振型一致性较 好，固有频率误差值不超过5%，验证了理论模型的准确性。 结合空间多维微振动模拟器的性能指标及第一代样机固有频率的研究结 果，得出了系统结构的优化思路，对结构进行了改进设计。对驱动腿进行优化 设计，提高了驱动腿弹片的抗径向倾覆能力，提高了铰链等部件结构刚度，消除了上、下铰链在平台控制中引起的非线性问题；解决了第一代样机驱动腿之 间互相导电的问题。对第二代样机模型进行了有限元建模仿真分析，同时进行 了样机实物的试验测试，结果表明第二代样机的结构设计达到了预期目标。
英文摘要	The variety of devices which are equipped on spacecraft, such as solar refrigeration compressor, rotating mechanism, adjusting gyroscope etc., will produce micro vibrations. The micro vibration has the characteristics of wide bandwidth, small amplitude and complex form, which seriously affect the image quality of optical remote sensor in space vehicle. The common solution is to install the vibration isolation device for optical remote sensor. In order to evaluate the effectiveness of the vibration isolation device, a large number of ground tests are needed. The premise of the work is to reproduce the micro vibration spectrum characteristics. Therefore, it is a subject with great significance to design a micro vibration simulator which can reproduce with different spectrum characteristics of micro vibration. Firstly, the dynamic characteristics of the space micro vibration simulator based on Gough-Stewart platform are studied. The dynamic model of the micro-vibration simulator is derived by Newton-Euler’s method, in which the quality of the legs and the hinge and the eccentricity of the load center are included. The mathematical analytic formula which can calculate the natural frequency and the main vibration mode of the micro vibration simulator is derived. Through the finite element simulation and the experimental test, the axial rigidity of a single driving leg is studied. At the same time, the dynamic characteristics of the first generation prototype are analyzed with theoretical method and finite element method. The natural frequency of the micro vibration simulator is tested. The simulation and test results show that the three methods are consistent with the natural frequency and the main vibration mode, and the error value of the natural frequency is not more than 5%. The accuracy of the theoretical model is verified. Combined with the performance index and the research results of the natural frequency of the first generation micro vibration simulator, the optimization method of the system structure is obtained. The driving leg is optimized, and the radial anti overturning ability of the spring in the driving leg is improved. The structural rigidity of the hinge is improved, and eliminate the nonlinear problem caused by the upper and lower hinge in the platform control. The problem that mutual conduction between the drive legs of the first generation prototype is solved. The finite element modeling and simulation analysis are carried out for the second generation model, and the experimental test of the prototype is carried out. It is shown that the structure design of the second generation prototype achieves the expected goal.
语种	中文
公开日期	2016-05-03
内容类型	学位论文
源URL	[http://ir.ciomp.ac.cn/handle/181722/49294]
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	辛建. 基于六维并联机构的空间多维微振动模拟器优化设计[D]. 中国科学院大学. 2015.

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