摘要
充气展开反射面天线的结构动力学参数,可用于预测天线在外界激励下的动态响应、调整空中姿态和振动主动控制等。采用试验模态方法对反射面天线进行试验研究,分析了充气展开后反射面天线在地面环境下的动态特性参数。通过增大力锤锤头面积和提高激励点局部刚度来激发柔性天线结构全局振动,分组移动和对称分布加速度传感器来减小测试系统的附加质量影响。结果表明:天线在充气环内压力15 kPa时的整体弯曲振动基频为2.86 Hz,同时获得天线整体振动的前三阶固有频率、模态阻尼比和模态振型等参数,测试结果可为有限元模型验证和在轨动态响应预报提供基础。
The structural dynamic parameters of the inflatable deployable reflector antenna are useful in predicting its dynamic responses under external excitation,adjusting the position in space as well as the positive suppressing of the structural vibration,etc.Experimental modal method was em-ployed for the experimental analysis,and the dynamic parameters of the inflatable deployable reflec-tor antenna under the ground environment were identified.Global vibration was excited by enlarging the hammer contact area and the stiffening local stiffness,while the adding mass effect of the test system was minimized by moving the accelerometers group by group and by placing the sensors on the structure symmetrically.The results indicated that,with the15kPa inner gas pressure in the in-flatable torus,the fundamental bending natural frequency was2.86Hz.In addition,the natural fre-quencies,the modal damping and the mode shapes of the first three orders global vibrations were ex-tracted.The test results may lay a good foundation for validating the finite element model and pre-dicting the structural dynamic responses in space.
作者
余建新
谭惠丰
卫剑征
YU Jianxin;TAN Huifeng;WEI Jianzheng(Center of Composite Materials and Structures,Harbin Institute of Technology, Harbin 150080, China;Center of Analysis and Measurement, Harbin Institute of Technology, Harbin 150001, China)
出处
《载人航天》
CSCD
2017年第4期506-511,共6页
Manned Spaceflight
基金
中央高校基本科研业务经费专项资金(HIT.MKSTISP.201609)
关键词
充气展开结构
反射面天线
动态特性
模态参数
inflatable deployable structure
reflector antenna
dynamic properties
modal parameters
作者简介
余建新，男，博士研究生，工程师,研究方向为大尺寸轻质柔性结构动态特性分析。E-mail:yujianxin03242@163.com;通讯作者:谭惠丰，男，博士，教授，研究方向为空间充气展开结构设计。E-mail:tanhf@hit.edu.cn
