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针对现有液压振动技术应用的现状以及液压系统中存在的液压冲击现象,提出了一种利用液压冲击来产生振动的激振系统。该系统以激波器为波动发生器,以管道为受控对象。阐述了液压波动发生的机理,并搭建了振动试验测试平台。对管道中的压力波动进行了研究,计算了压力脉动的最大理论值,并进行了试验验证,结果表明两者吻合较好,管道中的压力波动受控于系统频率。对管道振动特性的试验表明,管道两端的振动强度大于中间的振动强度,管道的振幅随系统频率与系统压力的增大而增大,系统压力在4.6 MPa以上,再增大系统压力,对管道的振幅影响不大。
Aiming at the present situation of the existing hydraulic vibration technology and the hydraulic impact phenomenon existing in the hydraulic system, a vibration excitation system using hydraulic impact is proposed. The system uses a wave generator as a fluctuation generator and a pipeline as a controlled object. The mechanism of hydraulic fluctuation is described and a vibration test test platform is set up. The pressure fluctuation in the pipeline was studied. The maximum theoretical value of the pressure pulsation was calculated and verified by experiments. The results show that the two agree well with each other, and the pressure fluctuation in the pipeline is controlled by the system frequency. Tests on the vibration characteristics of the pipeline show that the vibration intensity at both ends of the pipeline is greater than the vibration intensity in the middle. The amplitude of the pipeline increases with the increase of the system frequency and system pressure. The system pressure is above 4.6 MPa, and then the system pressure is increased. The amplitude has little effect.