一种具有横向低频特性的悬吊系统
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- 英文论文题名：A suspension system with the characteristic of low frequency in the lateral direction
- 论文作者：郑宜生 ; 张希农 ; 罗亚军
- 英文论文作者：Zheng Yisheng ; Zhang Xinong ; Luo Yajun ; State Key Laboratory for Strength and Vibration of Mechanical Structures ; School of Aerospace ; Xi'an Jiaotong University
- 年：2016
- 作者机构：西安交通大学航天航空学院机械结构强度与振动国家重点实验室;
- 论文关键词：负刚度 ; 低频 ; 悬吊系统 ; 摇头模态
- 英文论文关键词：negative stiffness ; low frequency ; suspension system ; shaking mode
- 会议召开时间：2016-08-12
- 会议录名称：第十六届全国模态分析与试验学术会议论文集
- 语种：中文
- 分类号：V443.4
- 学会代码：ZGZH
- 会议名称：第十六届全国模态分析与试验学术会议
- 会议地点：中国天津
- 主办单位：中国振动工程学会模态分析与试验专业委员会
- 学会名称：中国振动工程学会
- 页数：9
- 文件大小：871k
- 原文格式：D
- 会议级别：全国
摘要
本文针对大型环形天线的摇头模态测试问题,提出一种具有横向低频特性的悬吊系统。该悬吊系统在平衡天线重力的同时,在水平方向对天线具有很小的附加约束。该悬吊系统主要由传统的摆式悬吊系统和负刚度磁力弹簧组成,其中负刚度磁力弹簧由两个径向充磁的环形永磁铁组成,用于降低重力作用产生的恢复刚度,从而降低悬吊系统的悬吊频率。本文首先提出该悬吊系统模型,基于等效电流法计算得到磁力矩特性,并建立其动力学模型。然后对该悬吊系统进行频率特性分析,提出调节其悬吊频率的方法。最后将该悬吊系统应用于一口径5 m的环形天性,该天线具有很低的一阶摇头模态频率0.201 Hz。有限元分析结果表明,使用本文提出的低频悬吊系统,在选取合适的参数时,计算得到的天线一阶摇头模态频率为0.207 Hz,非常接近真实值,说明了所提出的低频悬吊系统的有效性。
In this paper,a suspension system with low natural frequency in the lateral direction is proposed to serve for the ground test of the shaking mode of large loop truss. The suspension system can balance the gravity of the truss while bringing in weak constraint to the truss. The proposed suspension system is mainly composed of a conventional pendulum and a negative stiffness magnetic spring. The magnetic spring consists of two ring magnets magnetized radially,which can produce negative stiffness to counteract the positive stiffness resulted from the gravity and hence reduce the natural frequency. Firstly,the model of the suspension system is proposed,and the magnetic torque generated by the magnetic spring is calculated based on the Amperian current model. Then the dynamic model of the suspension system is established. A tuning strategy is then put forward to reduce the natural frequency to an ultra-low level. Finally,the suspension system is applied to a large loop truss,the first-order "shaking-mode" frequency of which is 0.282 Hz. The FE results show that the first-order "shaking-mode" frequency is 0.286 Hz when the suspension system is employed,which is quite close to the true value. Hence the proposed suspension system is effective for the large loop truss.
In this paper,a suspension system with low natural frequency in the lateral direction is proposed to serve for the ground test of the shaking mode of large loop truss. The suspension system can balance the gravity of the truss while bringing in weak constraint to the truss. The proposed suspension system is mainly composed of a conventional pendulum and a negative stiffness magnetic spring. The magnetic spring consists of two ring magnets magnetized radially,which can produce negative stiffness to counteract the positive stiffness resulted from the gravity and hence reduce the natural frequency. Firstly,the model of the suspension system is proposed,and the magnetic torque generated by the magnetic spring is calculated based on the Amperian current model. Then the dynamic model of the suspension system is established. A tuning strategy is then put forward to reduce the natural frequency to an ultra-low level. Finally,the suspension system is applied to a large loop truss,the first-order "shaking-mode" frequency of which is 0.282 Hz. The FE results show that the first-order "shaking-mode" frequency is 0.286 Hz when the suspension system is employed,which is quite close to the true value. Hence the proposed suspension system is effective for the large loop truss.
引文
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[8]Zheng Y,Zhang X,Luo Y,et al.Design and experiment of a high-static-low-dynamic stiffness isolator using a negative stiffness magnetic spring[J].Journal of Sound&Vibration,2016,360:31-52.
[9]Zheng Y,Zhang X,Ma C,et al.An ultra-low frequency pendulum isolator using a negative stiffness magnetic spring[J].International Journal of Applied Electromagnetics and Mechanics,2016(In press).
[2]韦娟芳.卫星天线展开过程的零重力环境模拟设备[J].空间电子技术,2006,3(2):29-32.
[3]Barton M A,Kuroda K.Ultralow frequency oscillator using a pendulum with crossed suspension wires[J].Review of Scientific Instruments,1994,65(12):3775-3779.
[4]Liu J,Ju L,Blair D G.Vibration isolation performance of an ultra-low frequency folded pendulum resonator[J].Physics Letters A,1997,228(4–5):243-249.
[5]徐登峰,高阵雨,朱煜,等.三线摆水平隔振器原理与应用[J].北京航空航天大学学报,2010,36(8):1005-1008.
[6]Woodard S E,Housner J M.The nonlinear behavior of a passive zero-spring-rate suspension system[J].Journal of Guidance Control&Dynamics,1988,14(1):84-89.
[7]Carrella A,Brennan M J,Waters T P.Static analysis of a passive vibration isolator with quasi-zero-stiffness characteristic[J].Journal of Sound&Vibration,2007,301(3-5):678-689.
[8]Zheng Y,Zhang X,Luo Y,et al.Design and experiment of a high-static-low-dynamic stiffness isolator using a negative stiffness magnetic spring[J].Journal of Sound&Vibration,2016,360:31-52.
[9]Zheng Y,Zhang X,Ma C,et al.An ultra-low frequency pendulum isolator using a negative stiffness magnetic spring[J].International Journal of Applied Electromagnetics and Mechanics,2016(In press).