| Related citation: | Jianfeng Li,Sanmin Wang,Changjian Zhi,Bo Li,Qi’an Peng.Dynamic Characteristics of Planar Deployable Structure Based on Scissor-Like Element Using Influence Coefficient Method[J].Journal of Harbin Institute Of Technology(New Series),2017,24(5):53-60.DOI:10.11916/j.issn.1005-9113.17028. |
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| Author Name | Affiliation | | Jianfeng Li | School of Mechanical Engineering, Northwestern Polytechnical University, Xi’an 710072, China | | Sanmin Wang | School of Mechanical Engineering, Northwestern Polytechnical University, Xi’an 710072, China | | Changjian Zhi | School of Mechanical Engineering, Northwestern Polytechnical University, Xi’an 710072, China | | Bo Li | School of Mechanical Engineering, Northwestern Polytechnical University, Xi’an 710072, China | | Qi’an Peng | School of Mechanical Engineering, Northwestern Polytechnical University, Xi’an 710072, China |
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| Abstract: |
| In order to execute geometric analysis for planar deployable mechanism of scissors unit, the dynamic analysis model of scissor planar deployable structure is created based on the Cartesian coordinate system, the influence coefficient is acquired by means of the coordinate transformation, combining the D’Alembert’s principle with Dynamic-Static method, the dynamic characteristic analysis is completed finally. Moreover, specific calculating examples are adopted to verify the effectiveness of proposed method, and the result shows that the movement of each component of scissors unit mechanism is more smooth during initial deployment stage, however, when the configuration angle θ of unit mechanism is approaching π, some comparative large variations would appear on movement parameters and hinge constraint force. |
| Key words: dynamic characteristics deployable structure influence coefficient method Cartesian coordinate dynamic model |
| DOI：10.11916/j.issn.1005-9113.17028 |
| Clc Number:TH122 |
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| Descriptions in Chinese: |
| 基于影响系数法的剪式单元面可展机构动力学研究 李剑锋，王三民，智常建，李博，彭麒安 （西北工业大学 机电学院，西安 10072） 创新点说明： 1）对剪式单元的面可展机构进行几何分析，基于笛卡尔坐标系建立可展机构的动力学分析模型，通过坐标变换得到影响系数，利用达朗贝尔原理结合动静法，完成动力学特性分析。提出了一种基于影响系数法的剪式单元面可展机构动力学分析方法。 2）采用具体算例验证了本文方法的有效性。 3）结果发现剪式单元机构在展开的初始阶段，各构件运动比较平稳。当单元机构的位形角度 接近 时，各构件运动参数和铰链约束力变化较大。 研究目的： 为了研究可展天线机构的动力学特性，运用基于影响系数法简化了动力学分析过程，拓展了其应用范围。 研究方法： 基于笛卡尔坐标系建立可展机构的动力学分析模型，首先通过坐标变换，得到了各单元机构在广义坐标下的位移和运动影响系数；利用虚功原理，完成了动力学特性分析；然后采用达朗贝尔原理结合动静法，计算了各铰链的约力；最后给出具体算例验证本文方法的有效性。 结果： 结果发现剪式单元机构在展开的初始阶段，各构件运动比较平稳。当单元机构的位形角度 接近 时，各构件运动参数和铰链约束力变化较大。 结论： 1）采用影响系数法分析了面可展机构的动力学特性。 2）给出具体算例验证本文方法的有效性。采用该方法简化了动力学分析过程，拓展了其应用范围，具有较高的实际应用价值。 3）根据本文的研究，可以有效地预测面可展机构在展开过程中的动力学特性，有利于工程应用。在后续研究中，可以考虑以变力做驱动，避免在轨航天器在运动过程中发生运动突变，影响其运动姿态，从而延长航天器的使用寿命。 关键词：可展机构 几何分析 影响系数法 动力学
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