| 摘要 |
PURPOSE:To improve the control performance by providing a variable gain differential amplifier on a control device, and reducing a phase delay of a control signal. CONSTITUTION:A variable gain differential amplifier 5 is provided additionally on a control device consisting of a set signal source 1, a fatigue testing machine 2, a detector 3, a substracter 6, a proportional amplifier P, a differential amplifier D, an integral amplifier I and an adder 7, etc. In this state, a set signal from the set signal source 1 is brought to differential amplification by the variable gain differential amplifier 5, and supplied to the testing machine 2 through the adder 7. Subsequently, the testing machine 2 controls a piston rod by an adding signal which has added its differential signal and an integral signal supplied from the integrator I, by the adder 7. In this way, a phase delay of a control signal is reduced, and especially, even in a high speed control area, the control performance can be improved. |
