Aiming at the requirement of multi-point coordinated program-controlled loading under minimal load in structural static tests,a test method with slow proportional valve as execution structure and liquid gravity in water tank as control target is proposed,and a water load control model is established.In order to improve the response speed of the test control system,a direct digital control algorithm is designed and compared with the classical PID control algorithm.The simulation results show that the test method can realize the closed-loop control of minimal load in static tests,and the direct digital control algorithm is superior to the classical PID control algorithm.
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