About frequency response

The frequency response of any system is inversely proportional to the total lag time of all the links. We can compare, the first way: sensor detected hydraulic cylinder movement, PID algorithm (hypothesis the control algorithm and the parameters accurately), computer adjust the output drive torque motor response, push the main valve core change the valve port; Other way: the hydraulic cylinder movement through mechanical direct drive valve port opening and closing which is faster? Obviously, the second methods are less process, faster, more direct and accurate, it is the key advantage of integrated digital hydraulic. Integrated digital hydraulic mechanical feedback is more rapid, accurate and effective compared with servo hydraulic. It reflects the frequency range and accuracy more higher, which have been proved in many AEMETEC's practical applications case. For example: AEMETEC¡®s digital cylinder drive control 20 roll silicon steel strip rolling mill thickness automatic control system, realize the oriented silicon steel strip finished control accuracy of 0.257 mm +/- 3 microns, this is only the original high frequency response of the servo valve can be competent for the field. The basis of specific theory has long been in the early 80s of last century, Professor Yang Shixiang published papers on the digital hydraulic cylinder transfer function has been described in detail, here no longer express.