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Servo valve is the core component of hydraulic control system, which is widely used in industrial automation, aerospace, robot control and other fields. It can convert electrical signals into hydraulic output, and has the characteristics of fast response and high control accuracy. In order to better understand and design the servo valve control system, modeling and simulation using Simulink is an efficient and practical method. This paper will introduce how to build the simulation model of servo valve in Simulink.<\/p>\n
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First, the basic working principle of servo valve<\/p>\n
Servo valve usually consists of electromagnetic coil, torque motor, nozzle baffle mechanism and slide valve. Its working principle is: when the input electric signal changes, the electromagnetic coil is driven to generate a magnetic field, which pushes the baffle to change the pressure difference of the nozzle, and then controls the position of the slide valve and adjusts the flow and direction of hydraulic oil, thus controlling the motion state of the actuator (such as the hydraulic cylinder).<\/p>\n
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Second, the preparation of Simulink modeling<\/p>\n
Before building the model, the key parameters of the servo valve should be defined, such as:<\/p>\n
-Input voltage range<\/p>\n
-Flow gain<\/p>\n
-Relationship between spool displacement and voltage<\/p>\n
-Pressure and flow characteristics of hydraulic system<\/p>\n
-system dynamic response time constant, etc.<\/p>\n
In addition, it is necessary to understand the connection between servo valve and actuator (such as hydraulic cylinder or motor) and the control mode (such as PID control and feedforward control).<\/p>\n
—<\/p>\n
Third, the Simulink model building steps<\/p>\n
# 1. Establish the basic model structure<\/p>\n
Open MATLAB\/Simulink to create a new blank model. According to the working principle of servo valve, it can be modeled as the following subsystems:<\/p>\n
-Signal input module: used to input control voltage signal, which can be step signal, sine wave or any signal imported from workspace.<\/p>\n
-Dynamic model of servo valve: it can be realized by transfer function or Stateflow. Usually, the servo valve can be approximately represented by a first-order or second-order system:<\/p>\n
$$<\/p>\n
G(s) = frac{K}{\tau s + 1}<\/p>\n
$$<\/p>\n
Where k is the gain and \u03c4 is the time constant.<\/p>\n
-Hydraulic actuator module: It can be a dynamic model of hydraulic cylinder, including parameters such as mass, damping and stiffness, and is used to simulate load response.<\/p>\n
-Feedback and control module: PID controller is usually added to realize closed-loop control and improve the stability and response speed of the system.<\/p>\n
# 2. Parameter setting and module connection<\/p>\n
The modules are connected by signal lines to ensure the correct data flow. For example:<\/p>\n
-Input voltage signal \u2192 PID controller \u2192 servo valve model \u2192 hydraulic cylinder model \u2192 position\/speed output.<\/p>\n
-output feedback signal \u2192 return to PID controller to form a closed loop.<\/p>\n
# 3. Simulation Setup and Operation<\/p>\n
Set simulation time, solver type (ode45 is recommended), and configure input and output data records. After running the simulation, you can view the response curve through the Scope or To Workspace module.<\/p>\n
—<\/p>\n
Fourth, model verification and optimization<\/p>\n
After running the simulation, the results need to be analyzed and verified, such as:<\/p>\n
-Is the overshoot reasonable?<\/p>\n
-Whether the rise time and stabilization time meet the design requirements?<\/p>\n
-Is there oscillation or instability?<\/p>\n
According to the simulation results, PID parameters, system gain or other module parameters are adjusted to achieve optimal system performance.<\/p>\n
—<\/p>\n
V. Conclusion<\/p>\n
With the powerful modeling and simulation capabilities of Simulink, engineers can efficiently build a servo valve control system model, deeply understand its dynamic characteristics, and provide theoretical support for practical engineering applications. Through the continuous optimization of servo valve and its control system, the control accuracy and stability of the whole hydraulic system can be improved, which lays the foundation for intelligent control of high-end equipment.<\/p>\n
Through the above steps, users can complete a basic servo valve simulation model in Simulink, and lay a solid foundation for further complex system integration.<\/p>\n","protected":false},"excerpt":{"rendered":"
\ufeffServo valve is the core component of hydraulic control system, which is widely used in industrial automation, aerospace, robot control and other fields. It can convert electrical signals into hydraulic output, and has the characteristics of fast response and high control accuracy. In order to better understand and design the servo valve control system, modeling […]<\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[29],"tags":[],"class_list":["post-616","post","type-post","status-publish","format-standard","hentry","category-transport"],"_links":{"self":[{"href":"http:\/\/www.servovalvess.com\/index.php?rest_route=\/wp\/v2\/posts\/616","targetHints":{"allow":["GET"]}}],"collection":[{"href":"http:\/\/www.servovalvess.com\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/www.servovalvess.com\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/www.servovalvess.com\/index.php?rest_route=\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"http:\/\/www.servovalvess.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=616"}],"version-history":[{"count":0,"href":"http:\/\/www.servovalvess.com\/index.php?rest_route=\/wp\/v2\/posts\/616\/revisions"}],"wp:attachment":[{"href":"http:\/\/www.servovalvess.com\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=616"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/www.servovalvess.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=616"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/www.servovalvess.com\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=616"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}