一种主动液压激振系统空间振动的混沌化

发布时间：2018-03-12 10:04

本文选题：液压激振　切入点：合振动　出处：《机械设计与制造》2016年07期 　论文类型：期刊论文

【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。
[Abstract]:In order to study the vibration characteristics of a hydraulic vibration exciting system, a hydraulic vibration test system based on vibrating screen plate is developed. The vibration equation of different frequency combination vibration in three dimensional space of the system is established. The synthesis of vibration signals with different frequency ratios in space is numerically simulated, which indicates the complexity of vibration trajectory evolution with time. In order to study the chaotic characteristics of vibration signals, the Fourier transform is used as the basis. The random interference of vibration signal measured by vibrating screen plate is filtered by five-point moving average method, and the chaos is reduced. Then, the vibration signal measured by vibrating screen plate is synthesized in space. The synthetic trajectory is very complicated and agrees with the numerical simulation. In order to determine the chaos of vibration trajectory qualitatively, the phase space reconstruction of the time series of measured vibration signals and the appearance of strange attractors in Poincare cross section are presented. Finally, the chaos of the system is verified by power spectrum analysis, which shows that the chaos of vibration is obvious, which provides a theoretical basis for analyzing and predicting the trajectory of material moving on the vibrating screen.
【作者单位】：洛阳理工学院机械工程学院;黄淮学院信息工程学院;
【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)
【分类号】：TH137;TH113.1

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