| 摘要: |
| 为了对单模块桁架索网天线展开动力学进行建模，首先，基于力密度法提出一种考虑桁架弹性变形的索网找形方法：渐近迭代力密度法；其次，基于绝对节点坐标法建立桁架刚柔耦合模型，采用等几何分析方法建立索网非线性有限元模型，进而根据第一类拉格朗日方程建立天线刚柔耦合系统动力学方程，并采用广义-α方法对动力学方程进行高效数值积分；最后，对桁架索网天线展开过程的动力学特性进行了研究和分析。研究结果表明：索网找形方案满足天线反射面形面精度要求，得到均匀的索段张力分布；展开过程中桁架竖杆应力最大，在展开末段，驱动滑块对桁架产生较大冲击。 |
| 关键词: 桁架索网天线 找形方法 展开动力学 等几何分析 |
| DOI：10.15982/j.issn.2095-7777.2017.04.003 |
| 分类号: |
| 基金项目:国家自然科学基金资助项目（11290151） |
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| Research on Form-Finding and Deployment Dynamics for Modular Cable-Truss Antenna |
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CHANG Hanjing1, WANG Bi2, LUO Kai1, TIAN Qiang1, HU Haiyan1
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1.School of Aerospace Engineering, Beijing Institute of Technology, Beijing 100081, China;2.Aerospace System Engineering Shanghai, Shanghai 201108, China
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| Abstract: |
| In recent years,large deployable space structures such as modular space deployable antenna has great development potential to meet the nation's requirements in future space technology. The modular space deployable antenna is a rigid-flexible coupling multi-body system mainly composed of flexible supported truss,cable-net structure,metal mesh reflector and rigid joints. In order to indicate the dynamic response of the space deployable antenna,an asymptotic iterative form-finding method is proposed based on the force density method,and the rigid-flexible truss is modeling in the frame of the absolute nodal coordinate formulation. Besides,the cable-net structure is modeling with NURBS (Non-Uniform Rational B-Splines) cable element. Further more,,the dynamic differential algebraic equations of the rigid-flexible system are established based on the first Lagrangian's equation,and the generalized -α method is used for the high-performance numerical integration. Finally,the dynamic deployable response of the modular cable-truss antenna is studied. |
| Key words: cable-truss antenna form-finding method deployment dynamics isogeometric analysis |
