基于功率谱估计的伺服系统机械谐振分析  

Analysis for Mechanical Resonance of Servosystem Based on the Power Spectrum Estimation

作　　者：朱琰虹 文光武 ZHU Yanhong;WEN Guangwu(GSK Equipment Co.,Ltd.,Guangzhou 510530,China;GSK Information Technology Co.,Ltd.,Guangzhou 510603,China)

机构地区：[1]广州数控设备有限公司,广州510530 [2]广州数控信息科技有限公司,广州510603

出　　处：《机电工程技术》2020年第2期189-193,共5页Mechanical & Electrical Engineering Technology

摘　　要：针对伺服系统产生的机械谐振极易造成系统不稳定,甚至导致破坏性事故的事实,提出一种基于功率谱估计的伺服系统机械谐振分析方法。立足于功率谱对离散信号在频域中统计特性明显的物理意义以及离散线性非时变系统的频率特性与自功率谱和互功率谱的关系,通过用白噪声信号(M序列)和Chirp信号作为激励对伺服系统进行扫频,对转矩指令信号和速度反馈信号进行采样,再藉由功率谱估计算法计算出系统的反谐振频率和谐振频率,从而为伺服单元速度环和位置环闭环带宽的配置提供了依据。实际工程应用结果表明,该研究方法对分析伺服系统机械谐振具有较好的应用价值和可行性。Aimed on the fact that mechanical resonance from the servo system can lead system to unstability or damage,a method of analysis for mechanical resonance based on the power spectrum estimation was put forward.Rested upon the physical significance of power spectrum for discrete signal in frequency domain and the relationship between frequency characteristic and power resonance,Servo system stimulated by White noise signal or Chirp signal,the torque command signal and the speed feedback signal sampled synchronously.By the power spectrum resonance algorithm,an anti-resonant frequency and a torsional natural frequency are calculated,which contributes to bandwidth allocation of the speed loop and the position loop for servo.The application results show that this method is valuable and feasible for analyzing mechanical resonance.

关 键 词：各态历经信号 功率谱 反谐振频率 谐振频率 

分 类 号：TN713[电子电信—电路与系统]