Study on hydraulic servo system which uses magnetic fluid as working fluid.

我们开发了一种磁控层流比例放大器（MCLPA），该放大器在电源喷嘴出口处安装了两个电磁铁。采用磁性流体代替传统的石油作为MCLPA液压系统的工作流体，可以实现无运动部件的电转机械换能器。MCLPA喷嘴宽度为1 mm，长径比为0.5和1。在本研究中，我们研究了MCLPA的特征。MCLPA的电磁铁在电流为1 a时产生的最大磁场强度为0.1 t，在没有任何电源电流的情况下，MCLPA的压力恢复随修正雷诺数成比例地增加。最大压力恢复为37%，经证实，MCLPA的形状和尺寸适合这种应用。对电磁铁施加恒定电流，即1 a， MCLPA两个出口之间的压差随修正雷诺数成比例地增加。修正雷诺数为850时，最大压差为74.7 KPa。输出压差的增加大约与电磁铁的电源电流的第二功率成比例。

We developed a magnetic controlled laminar proportional amplifier (MCLPA) which has two electromagnets installed at the outlet of a supply nozzle. Using a magnetic fluid as the working fluid of a hydraulic system of the MCLPA instead of conventional petroleum, an electrical to mechanical transducer having no moving parts can be realized.Width of the nozzle of the MCLPA was 1 mm and aspect ratio were 0.5 and 1. In this study , we examined the characteristics of the MCLPA. The maximum strength of the magnetic field which was generated by the electromagnet of the MCLPA with a current of 1 A was 0.1 T. Without any supply current, pressure recovery of the MCLPA increased in proportion to the modified Reynolds number. The maximum pressure recovery was 37 % It was confirmed that the shape and dimensions of the MCLPA was adequate for this application. Applying a constant current, i.e., 1 A, to the electromagnet, the pressure difference between two outlet ports of the MCLPA increased in proportion to the modified Reynolds number. The maximum pressure difference was 74.7 KPa at the modified Reynolds number of 850. The output pressure difference increased aproximately in proportion to the second power of the supply current to the electromagnet.