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Maximum power transfer to the load and selection of supply pressure
Comparison of the flow rate with the nominal flow rate at the same nominal current gives: . litre/min 21.6. Click on the ad to read more Click on the ad to read more Click on the ad to read more Click on the ad to read more Click on the ad to read more Click on the ad to read more Click on the ad to read more Click the ad to read more Click the ad to read more Click the ad to read more Click the ad to read more Click the ad to read more Click the ad to read more Click on the ad to read more Click on the ad to read more Click on the ad to read more.
Connecting a servovalve to a cylinder, the open-loop steady-state behaviour
An interesting feature of a single-rod actuator is that the extension velocity and retraction velocity can be made equal by (3.5) to give: Click on the ad to read more Click on the ad to read more Click on the ad to read more Click on the ad to read more Click on the ad to read more Click on the ad to read more Click on ad to read more Click on ad to read more Click on ad to read more Click on ad to read more Click on ad to read more Click on ad to read more Click on ad to read more Click on ad to read more Click on ad to read more Click on ad to read more Click on ad to read more Get help now.
Connecting a servovalve to a motor, the open-loop steady-state behaviour
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Connecting a servovalve to a motor, the closed-loop steady-state behaviour
The effect of increasing the closed loop gain K of the system can be seen in Figure 3.4 when the load pressure is increased. Click on the ad to read more Click on the ad to read more Click on the ad to read more Click on the ad to read more Click on the ad to read more Click on the ad to read more Click on the ad to read more Click the ad to read more Click the ad to read more Click the ad to read more Click the ad to read more Click the ad to read more Click the ad to read more Click the ad to read more Click the ad to read more Click the ad to read more Click the ad to read more Click the ad to read more Click the ad to read more to read.
Connecting a servovalve to a cylinder, the closed-loop position transient response
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Servodrive damping, leakage and friction losses, efficiency
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Improving the steady-state performance of an open-loop motor servodrive using a Programmable Servo Controller
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Fluid compressibility and its effect on flow rate
Whether or not the servo valve dynamics should be included usually depends on the size of the moving mass for a linear actuator or the rotary inertia for a motor combined with actuator size. Click on the ad to read more Click on the ad to read more Click on the ad to read more Click on the ad to read more Click on the ad to read more Click on the ad to read more Click on the ad to read more on the ad to read more Click on the ad to read more Click on the ad to read more Click on the ad to read more Click on the ad to read more Click on the ad to to read more Click on the ad to read more Click on the ad to read more Click on the ad to read more Click on the ad to read more Click on the ad to read more Click on the ad to read more read Click on the ad to read more Click on the ad to read more Click on the ad to read more Click on the ad to read more Click on the ad to read more Click on the ad to read more.
Force and torque equations for actuators with moving mass or rotary inertia
Undamped natural frequency of an actuator
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Actuator equations with losses and dynamics
Consider an open-loop servo drive with a double-bar actuator with the servo valve mounted directly on the actuator. Click on the ad to read more Click on the ad to read more Click on the ad to read more Click on the ad to read more Click on the ad to read more Click on the ad to read more Click on the ad to read more on the ad to read more Click on the ad to read more Click on the ad to read more Click on the ad to read more Click on the ad to read more Click on the ad to to read more Click on the ad to read more Click on the ad to read more Click on the ad to read more Click on the ad to read more Click on the ad to read more Click on the ad to read more read Click on the ad to read more Click on the ad to read more Click on the ad to read more Click on the ad to read more Click on the ad to read more Click on the ad to read more Click on the ad to read more Click on the ad to read more Click on the ad to read more.
Linearisation of the system equations
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Pipe resistance, compressibility and inertia
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Servovodrive open-loop linearised differential equation with losses and dynamics
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Servovalve dynamics
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The role of computer simulation
Building a Matlab Simulink model is relatively easy, each differential equation is rearranged so that the highest differential term is placed on the left side. If the simulation uses symbols P1 and P2 for pressures, then use plot(t,P1,t,P2) to display the pressures. note that later versions of software not used by the author may have significant updates. The general Matlab Simulink block diagram for the open-loop linear actuator system is now shown as Figure 4.7 and is exactly as it appears on the computer screen.
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Laplace transforms
To solve this differential equation, then transform each element using the appropriate Laplace transforms from Table 1. Click the ad to read more Click the ad to read more Click the ad to read more Click the ad to read more Click on the ad to read more Click on the ad to read more Click on the ad to read more Click on the ad to read more Click on the ad to read more Click on the ad to read more Click on the ad to read more Click on the ad to read more Click on the ad to read more Click on the ad to read more Click on the ad to read more Click on the ad to read more Click on the ad to read more Click on the ad to read more Click on the ad to read more Click on the ad to read more Click on the ad to read more Click on the ad to read more Click on the ad to read more Click on the ad to read more Click on the ad to read more Click on the ad for to read more Click on the ad to read more Click on the ad to read more Click on the ad to read more Click on the ad to read more Click on the ad to read more Click on the ad to read more Click on the ad to read more Click on the ad to read more Click on the ad to read more Click on the ad to read more.
Transfer functions and block diagrams
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Undamped natural frequency with connecting line effects
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- Transient response and its specification
- Frequency response
- The effect of a pure delay
- Closed-loop stability
- The use of frequency response
- Some preliminary comments
- The use of servoamplifier dither to improve steady-state error drift for a position control system
- The effect of spool under-lap on the steady-state error for a position control system
- Steady-state tracking error in response to a velocity demand for a position control system
- Optimising the closed-loop transient response
- Velocity sensing or Derivative computation
- Additional acceleration, or pressure, feedback
- Proportional+Integral+Derivative (PID) control
- Gain scheduling using a PSC
- Digital control algorithms using a PSC
- Improving the dynamic performance of an open-loop motor servodrive using a PSC and pressure derivative feedback
- Pressure control of a fixed-volume container
- Force control of a servoactuator
The graph of the measured transfer function for the servo valve is shown and is only one of many depending on the type and rating of the servo valve selected. For each type of control system, servo valve dynamics may or may not be important, depending on the dynamics of the system and its load.
