一种主动液压激振系统空间振动的混沌化  

Chaotic Motion of Spatial Vibration Based on an Active Hydraulic Excitation System

作　　者：张慧贤[1] 苗灵霞[1] 禹定臣[2] 

机构地区：[1]洛阳理工学院机械工程学院,河南洛阳471023 [2]黄淮学院信息工程学院,河南驻马店463000

出　　处：《机械设计与制造》2016年第7期181-185,共5页Machinery Design & Manufacture

基　　金：国家自然科学基金-河南人才培养联合基金资助项目(U1404513)

摘　　要：为研究一种液压激振系统的振动特性,开发了基于振动筛板的液压激振测试系统。建立了系统三维空间不同频率合振动的振动方程,数值模拟了不同频率比的振动信号在空间振动的合成,表明振动轨迹随时间演化的复杂性。为研究振动信号的混沌特性,以傅里叶变换为基础,采用五点滑动平均法对振动筛板实测振动信号的随机干扰进行了滤除,降低了带来的类混沌化。然后对振动筛板实测的振动信号进行了空间合成,合成轨迹非常复杂并与数值模拟吻合。为定性判断振动轨迹的混沌性,对实测振动信号的时间序列进行了相空间重构,Poincare截面出现了奇怪吸引子,表明系统出现了典型的混沌运动。最后采用功率谱分析验证了系统的混沌性,显示出振动的混沌化明显,为分析及预测物料在振动筛板上的运动轨迹提供了理论依据。To study the vibration characteristics of a hydraulic excitation system, the hydraulic excitation testing system based on vibration screen was developed. The three-dimensianal resultant vibration equation of the system with different vibration frequencies was established and the resultant trajectories of the vibration signals with different frequency ratio were simulated, indicating that the vibration trajectories are complicated. To study the chaotic characteristics of the vibration signals, by flourier transform, using five-point moving overage method, the random noise of the measured vibration signals were .filtered, reducing the unreal chaos of vibration signals. Then the measured vibration signals of the vibration screen were synthesized. Its trajectories are very complex and consistent with the numerical simulation. Moreover, for judging the chaotic of the vibration trajectory, the time series of the measured vibration signals were reconstructed by phase space. Poincare section appears strange attractor, indicating that the system appears typical chaotic motion. Finally, the power spectrum analysis verifies the chaos of the system, implying that the chaos of the hydraulic excitation system is apparent. So, it provides theoretical basis for analyzing and predicting the vibration trajectories of materials on the vibration screen.

关 键 词：液压激振 合振动 混沌 POINCARE截面 功率谱 

分 类 号：TH16[机械工程—机械制造及自动化] O351.2[理学—流体力学]