2D阀控差动缸式电液激振器振动波形研究

Vibration Waveform Research on Electro-hydraulic Exciter of Differential Cylinder Controlled by 2D Valve

为了提高激振器的振动频率,提出了一种由2D阀控制差动式液压缸的新型电液激振器,该激振器通过控制无杆腔容腔的体积变化实现液压固有频率的改变。阐述了激振器的工作原理并建立其数学模型,利用Matlab中的Simulink构建了系统仿真模型,对系统在低、中和高频段工作时的振动波形进行了仿真研究。为了验证理论分析以及激振器在低频段、中频段和高频段工作时实际输出振动波形,设计了电液激振器并进行了实验研究。实验结果表明:激振器的负载以弹性力为主时,振动频率在5Hz以下,激振器输出的振动波形容易出现饱和现象,随着激振频率的提高,饱和现象消失,当振动频率与液压系统固有频率相等时会产生谐振现象(即振动幅值突然放大),过了谐振点后振动幅值会快速下降。

In order to improve the working frequency of electro-hydraulic exciters, an electro-hydraulic exciter based on differential hydraulic cylinder controlled by 2D valve was proposed, which could realize the change of hydraulic intrinsic frequency by controlling the volume of non-rod chamber. The scheme of electro-hydraulic exciter was analyzed and the mathematical model was set up. The simulation model was also Constructed by the Simulink Toolbox of Matlab. The vibration waveform of exciter in low-frequency, middle-frequency and high-frequency were simulated. To verify the theoretical analysis and real vibration ＂waveform of exciter, the electro-hydraulic exciter was designed and experimented. Results showed when the main part of the load constituted by the elastic force, the output waveform of exciter saturation under frequency of 5 Hz. With the increase of agitating frequency, the saturation The resonance phenomenon would be occurred when the exciting frequency was equal to was prone to disappeared the intrinsic frequency of hydraulic system. The vibration amplitude would drop down rapidly after the resonance frequency.