气压液体式磨床自动平衡装置控制策略与实验研究

Control strategy and experiment research on liquid-transfer active balancing device by pneumatic means for grinding machines

砂轮在线动平衡装置是高速磨床上的重要组成部分。介绍了一种新型的气压液体式在线自动平衡系统,为该平衡系统提供了一种靶向控制策略。该控制策略在平衡装置执行操作前,已经准确定位不平衡量的大小和相位;平衡过程中,系统有确定目标的进行注气操作,系统振动幅值单调下降,平衡过程无错调现象。对注气操作的控制方案进行了定量分析,并选出了最优方案。实验结果表明,在多种转速下,该类平衡装置均可在15 s内有效地降低系统的不平衡振动,且振幅下降比例均在90%以上。

Active balancing device of grinding wheel is an important part for high-speed grinding machines. A new type of liquid-transfer active balancing device was proposed and a targeted control strategy was provided for the balancing device. In the strategy,the amplitude and phase of imbalance were determined before the running of balancing device.During the process of balancing,the compressed air was injected to a determinate target,so as to make the amplitude of vibration decrease monotonically without any erroneous regulation phenomenon. Quantitative analysis was done on several control paths and the optimal path was selected. The experiment result demonstrates that the unbalance response can be reduced in 15 s under three speed conditions and the decrease in amplitude is more than 90%.