光电跟踪转台垂直轴系动态特性

Dynamic characteristics of vertical shaft system of photoelectric turntable

为实现光电跟踪转台的精密控制,对某型号跟踪转台垂直轴系动态特性进行了研究。首先分析了轴系固有频率与转台谐振频率之间关系,建立了垂直轴系动力学模型。然后建立了转台有限元模型,进行了模态分析,并根据实际工况,加载激励和边界条件,利用显式积分对垂直轴工作情况下整个转台响应进行求解。最后搭建了垂直轴系动态特性实验平台,进行伺服扫频实验,获得垂直轴以及随动部件的时域和频域特性。结果表明:动力学分析垂直轴系固有频率为180.4Hz,仿真结果为190Hz,伺服实验扫频结果为174Hz,最大误差在10%以内,根据分析提出了增大垂直轴系固有频率与选取控制带宽的参考方案,为轴系动态特性探索研究与优化提供了依据。

In order to realize precise control of photoelectric turntable,the dynamic characteristics of the vertical shaft of a type of photoelectric turntable are investigated.First,the relationship between the natural frequency of the shaft and the turntable is analyzed,and the dynamic model of the vertical shaft is built.Then,the finite element model is established,modal analysis is carried out and the excitation and boundary conditions are loaded according to the actual working conditions.Using explicit integration,the response of the turntable is solved.Finally,the experimental platform for researching the dynamic characteristics of the vertical shaft is set up.Servo scanning experiment is carried out to obtain the characteristics of the shaft in time domain and frequency domain.Results show that the natural frequency obtained by kinetic analysis is 180.4 Hz,by simulation is 190 Hz and the experiment result is 174 Hz,the maximum error is less than 10%.According to the analysis,a reference scheme to increase the natural frequency of the vertical shaft system and to select the controlbandwidth is proposed.This scheme provides the reference for research on the dynamic characteristics and optimization of the shaft system.