A new servomechanism for static load test

To realize the static loading function, a new servomechanism using a new servo-proportional valve to control a multi-chambers servo-cylinder is introduced in this paper. The new servo-proportional valve boasts four working ports connected to the relative multi-chambers servo-cylinder, which can control the movement of multi-chambers servo-cylinder and realize auxiliary brake, precise force and position control in static load test. To analyze the factors taking the strategy of static step in current loading application, and give a description on why and how to achieve the demand control performance based on the new servomechanism configuration. Thanks to the special construction of the new servo-proportional valve, its flow gradient and pressure gradient is smaller than that of servo valve boasting the same flow capacity, which makes the precise position and force control easily. The auxiliary brake function of the new servo-proportional valve is activated within its pressure gain area, which will create additional force to brake the servomechanism in both direction. The new servomechanism is an alternative solution for static load test.