周边桁架式可展开天线展开过程动力学分析、控制与实验

发布时间：2018-06-18 12:36

本文选题：周边桁架 + 可展开天线　；参考：《西安电子科技大学》2014年硕士论文

【摘要】：针对周边桁架式可展开天线展开过程中非线性因素对展开过程性能的影响,本文对展开过程多柔体动力学分析、轨迹设计及实验等问题做了较为深入的研究:1.应用模态综合理论,对周边桁架式可展开天线这种典型的多柔体系统进行了动力学建模,考虑摩擦、间隙、阻尼等非线性因素,并初步分析了单元展开不同步性和索网预张力对展开过程性能的影响。通过典型案例,分析周边桁架式可展开天线在轨环境下的展开过程动力学响应,为有效进行展开过程轨迹设计打下了基础。2.针对空间可展开天线冲击过大的问题,提出了一种考虑星-天动力耦合的展开过程轨迹设计方法。首先,建立了空间可展开天线在轨展开时天线展开运动和卫星本体姿态稳定的耦合动力学模型;其次,利用贝塞尔曲线合成驱动索的运动轨迹,通过可展开天线的动力耦合作用得到天线展开过程中星-天系统的运动轨迹;然后,基于优化方法同时选择天线的展开轨迹及时间,在满足卫星本体偏转角和偏转角速度性能指标的约束下,确定可展开天线展开时间的下限参考值。最后结合数值仿真算例,说明了该轨迹设计方法的合理性和有效性。3.针对展开过程涉及的若干复杂非线性动力学问题,参与研制了2m口径的周边桁架式可展开天线实物模型。系统设计了展开过程动力学的实验方案,对展开过程动力学实验结果进行了详细分析。4.完善了综合设计平台中的“展开过程动力学分析”模块,包括可展开天线参数化多体动力学模型的建立及动力学分析和动响应预测,详细介绍了平台的界面、功能,并进行了算例验证。
[Abstract]:Aiming at the influence of nonlinear factors on the development performance of peripheral truss deployable antennas, the dynamic analysis, trajectory design and experiment of multi-flexible bodies during expansion are studied in this paper. Based on the modal synthesis theory, the dynamic modeling of a typical multi-flexible system, such as the peripheral truss deployable antenna, is carried out. The nonlinear factors such as friction, clearance and damping are considered. The effects of the unsynchronicity of the element expansion and the pretension of the cable mesh on the performance of the expansion process are analyzed. The dynamic response of the unfolding process of the peripheral truss deployable antenna in orbit environment is analyzed by a typical case, which lays a foundation for the effective design of the deployable track. In order to solve the problem of excessive impact of deployable antenna, a trajectory design method for space deployable antenna is proposed in this paper, which considers the star-space dynamic coupling. First of all, the coupled dynamic model of antenna deployment and satellite body attitude stability is established when the space deployable antenna is in orbit. Secondly, the trajectory of the driving cable is synthesized by using the Bezier curve. Through the dynamic coupling of the deployable antenna, the trajectory of the star-sky system is obtained, and then, based on the optimization method, the trajectory and time of the antenna are selected simultaneously. Under the constraint of satellite body deflection angle and angular velocity, the lower limit reference value of deployable antenna is determined. Finally, the rationality and validity of the trajectory design method are illustrated by numerical simulation examples. Aiming at some complex nonlinear dynamic problems involved in the development process, a physical model of a 2m diameter peripheral truss deployable antenna is developed. The experimental scheme of unfolding process dynamics is designed, and the experimental results of unfolding process dynamics are analyzed in detail. The development process dynamic analysis module of the integrated design platform is perfected, including the establishment of parameterized multi-body dynamics model of deployable antenna and the dynamic analysis and dynamic response prediction. The interface and function of the platform are introduced in detail. A numerical example is given.
【学位授予单位】：西安电子科技大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TN820

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