摘要
为准确再现5~500 Hz频宽范围参考加速度功率谱密度,针对电液伺服随机振动控制系统,建立了其非线性数学模型.考虑压力流量特性和伺服阀控制死区的影响,状态依赖Riccati方程技术被引入来获得系统变增益状态反馈,拓展了系统频宽;同时结合功率谱密度均衡方法,在频域上对输入信号进行了修正.通过Simulink仿真分析可知,功率谱密度稳定波动范围在±1 dB以内.
A nonlinear mathematical model was established on electro-hydraulic servo system with stochastic vibration control in order to reproduce reference acceleration power spectrum density(PSD)of 5~500 Hz frequency range accurately.The state dependent riccati equation(SDRE)technology was introduced to acquire system state feedback of variable gain and expand system bandwidth,considering the influence of pressure flow characteristic and servo valve control dead zone.Meanwhile the PSD equalization method was applied to modify the input signal in the frequency domain.According to the analysis in Simulink,the steady fluctuation range of PSD is within±1 dB.
作者
付波
谢安桓
赵春宇
周华
FU Bo;XIE An-huan;ZHAO Chun-yu;ZHOU Hua(State Key Laboratory of Fluid Power and Mechatronic Systems, Zhejiang University, Hangzhou,Zhejiang 310027, China;Zhijiang Lab, Hangzhou,Zhejiang 311121, China)
出处
《北京理工大学学报》
EI
CAS
CSCD
北大核心
2020年第5期491-495,共5页
Transactions of Beijing Institute of Technology
关键词
电液伺服控制系统
随机振动
加速度
功率谱密度
electro-hydraulic servo control system
stochastic vibration
acceleration
power spectrum density(PSD)
