Tyt Electric Servo actuator and digital hydraulic linear Servo actuator, in the behavior control system, the actuator is the executive, receiving the control instruction of the behavior control system, providing the behavior power, complete the attitude and trajectory control required by the behavior control system. Its performance directly affects the Operability, stability, security and other performance of the mobile control system. The more common action system has the hydraulic pressure, the electromechanical, the pneumatic and so on. Among them, the hydraulic actuator which needs the central hydraulic source to provide the power is most widely used. Type of actuator: Hydraulic actuator and electric actuator. Hydraulic actuator (more traditional, but also the most widely used actuator) , hydraulic actuator, hydraulic actuator, hydraulic actuator, electro-hydraulic Servo valve control hydraulic actuator, actuator requires a central hydraulic system. Hydraulic pump by the traditional quantitative or variable AC drive, the resulting hydraulic power to push the hydraulic cylinder (or motor) . Electro-hydraulic Servo valve limits flow and direction. Advantages: large output force, good dynamic response, high stiffness. DISADVANTAGES: PUMP and valve failure due to wear and contamination, leakage, low life cycle, high maintenance costs, power transfer efficiency increases with distance, prone to damage. Electric actuators (also known as Servo actuators, new technology, powerful momentum electromechanical actuators through the control of motor or Servo motor direct or indirect operation to control the movement of the load, to achieve a class of systems target position Servo control. Electric steering gear is a typical electric steering gear, which Directly Converts Electric Energy into Mechanical Energy, saving the complicated oil circuit of traditional hydraulic steering gear system.Target Position Control is realized by controlling the movement of load directly or indirectly through the operation of motor. According to the output form, electromechanical actuator can be divided into straight output type and rotary output type two kinds. The application of electro-mechanical actuator (Servo actuator) in aircraft flight control greatly improves the reliability, maintainability and flexibility of aircraft, and reduces the weight and fuel consumption of aircraft. Compared with the traditional hydraulic actuator, which is expensive to maintain and easy to damage, its safety performance and economic performance have more advantages. Especially in the face of the demand of modern war on UAV, UAV electric actuator is an indispensable part of UAV flight control system, which makes UAV electric actuator reach the peak of development.The main function of the actuator is to exert control force on the controlled object according to certain control law. With the development of active vibration control technology, the demand for actuator is higher and higher. In recent years, on the basis of traditional fluid actuators, gas actuators and electric actuators, there are intelligent actuators such as piezoelectric ceramic actuators, piezoelectric film actuators, electrostrictive actuators, magnetostrictive actuators, shape-memory Alloy actuators, Servo actuators and electrorheological actuators. The presence of these actuators provides the necessary conditions for high-precision active vibration control. Electric actuator built-in ball screw (or roller screw) + servo motor structure, using electric propulsion, space saving, no noise, thrust up to ± 100 tons, maximum displacement ± 1500 mm, control accuracy 0.02 mm, frequency range 0-50 hz, it can be used for displacement control, force control, acceleration control and smooth switching of various control modes. The power of the small electric actuator is less than 1.5 kw, and it can use 220v lighting power directly, especially suitable for model experiment, teaching experiment and demonstration experiment. Electric actuator equipped with quasi-static testing software and data acquisition software, can meet the requirements of modern structural testing. The electromechanical Servo actuator converts the Output Command Signal of the servo controller driver into mechanical quantities such as speed, displacement, load, etc. , a mechatronics engineering device that achieves the goal of driving the speed, displacement, and load of the control object. Electromechanical actuators are widely used in weapon tracking system, electric folding system, electric winch system, steering control system, electric retracting system and intelligent robot.