航空学报 > 2024, Vol. 45 Issue (2): 328658-328658   doi: 10.7527/S1000-6893.2024.28658

电磁散射测试的可重构绳系并联支撑机构

柳汀1, 林麒1(), 刘震1, 王晓光1, 吴惠松1, 许勇刚2   

  1. 1.厦门大学 航空航天学院,厦门 361102
    2.电磁散射国家重点实验室,上海 200438
  • 收稿日期:2023-03-07 修回日期:2023-04-17 接受日期:2023-05-15 出版日期:2023-12-18 发布日期:2023-12-18
  • 通讯作者: 林麒 E-mail:qilin@xmu.edu.cn
  • 基金资助:
    国家自然科学基金(12072304)

Reconfigurable wire⁃driven parallel support mechanism for electromagnetic scattering test

Ting LIU1, Qi LIN1(), Zhen LIU1, Xiaoguang WANG1, Huisong WU1, Yonggang XU2   

  1. 1.School of Aerospace Engineering,Xiamen University,Xiamen 361102,China
    2.Science and Technology on Electromagnetic Scattering Laboratory,Shanghai 200438,China
  • Received:2023-03-07 Revised:2023-04-17 Accepted:2023-05-15 Online:2023-12-18 Published:2023-12-18
  • Contact: Qi LIN E-mail:qilin@xmu.edu.cn
  • Supported by:
    National Natural Science Foundation of China(12072304)

摘要:

根据电磁散射测试时被测目标物姿态滚转变化的需求,提出一种能同时满足全滚转扫描和其他多种姿态测试要求的可重构绳系并联支撑机构设计方案,并进行了理论分析和试验验证。用双回转机构构建可重构绳系并联支撑机构,建立了该机构的运动学模型和静力学模型。根据该机构的结构矩阵,采用蒙特卡罗法求解其力闭合工作空间,计算得到设计参数下的姿态工作空间,分析了目标物全滚转、俯仰,全滚转、俯仰和偏航2种组合姿态运动状态下,绳长的变化规律和绳拉力的分布情况。进一步地,分别对泡沫转台支架和绳系结构支撑的电磁散射特性进行了测试和分析。最后,分析了某飞机目标物在泡沫转台支架和绳系支撑下的雷达散射截面。结果表明:在8~12 GHz频段内,可重构绳系并联支撑机构表现出很好的低散射特性。2种支撑方式下飞机目标雷达散射截面测试误差的绝对值小于1 dBsm,相对误差为±10%。可重构绳系并联支撑机构支撑可拓展电磁散射测试能力,具有良好的工程实际应用前景。

关键词: 可重构绳系并联支撑机构, 目标测试支撑机构, 工作空间, 电磁散射测试, 目标电磁散射特性

Abstract:

In view of the requirement that the rolling attitude of the object needs to be changed in the electromagnetic scattering test, a design scheme of a reconfigurable wire-driven parallel support mechanism is proposed, which can meet the test requirements in full rolling scanning and other attitudes. Its feasibility is theoretically analyzed and experimentally demonstrated. A reconfiguration strategy with a double rotary mechanism is used to construct a reconfigurable wire-driven parallel support mechanism, and the kinematic and static model of the mechanism is derived. Based on the structure matrix of the mechanism, the force closure workspace is solved using the Monte-Carlo method to calculate the attitude workspace for the design parameters. The variation pattern of cable length and the variation characteristics of wire tension are further analyzed for the two composite attitudes motion states of full rolling and pitching, full rolling and pitching and yawing of the target. Further, the electromagnetic scattering characteristics of the foam turntable support and wire structure are tested and analyzed. Finally, a comparative analysis of the radar scattering cross section of an aircraft target supported by the foam turntable support and by the wire-driven parallel support mechanism is carried out. The results indicate that the mechanism proposed shows good low scattering characteristics at 8~12 GHz frequency band. With the two support methods, the absolute value of the test error of the radar cross section of the aircraft target is less than 1 dBsm, and the relative error is between ±10%. The mechanism proposed can expand the ability of electromagnetic scattering test, and has a good prospect in engineering application.

Key words: reconfigurable wire-driven parallel mechanism, target test support mechanism, workspace, electromagnetic scattering measurement, target electromagnetic scattering characteristic

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