液力减速器振动特性的试验研究

为研究充液率、转速及叶片倾角对液力减速器外特性的影响,通过INV3020数据采集系统建立了振动试验系统,实现了振动信号的采集.以75°及90°泵轮液力减速器为模型,调节充液率维持在50%,60%,70%,80%,90%,100%情况下,调节变频器使泵轮转速恒定在800~1 200 r/min 5种工况进行试验研究.研究结果表明:充液率及转速的增加能够加剧液力减速器的振动特性,叶片倾角的减小使空化提前发生,发生空化时会出现振动激增现象;液力减速器从泵轮流出的液流对涡轮的作用力主要为轴向冲击力,故轴向测点振动最剧烈,其他方向测点振动幅值小于轴向测点.

Experimental investigation on vibration of a hydraulic retarder

In order to study the influence of liquid-filling ratio,rotating speed and blade tilt angle on hydraulic characteristics of hydraulic retarder,the noise and vibration experimental system was established by using INV3020 data collection instrument,which realized the synchronous collection of vibration signal. By using 75°and 90° blade tilt angles of impeller in hydraulic retarder,the liquid-filling ratio from 50% to 100% and the frequency converter to stabilize the rotating speed varing from 800 r/min to1 200 r/min were adjusted. The results show that the performance of vibration increases with the liquid-filling ratio and the rotating speed increasing,and cavitation occurs in advance with the decrease of blade tilt angle,which can cause the vibration to increase sharply. The acting force produced by liquid flow from pump wheel to worm wheel in hydralic retarder is dominated mainly by axial impact,which making the most serious vibration at axial measure point,which is more serious than that at other measure points.