Driver Actuator

Driver Actuator
Apply relative motion between a pair of constrained bodies through driver
Library
Sensors & Actuators
Description
The Driver Actuator block actuates a Driver block connected between a pair of bodies. You connect the block to the Driver block connected between the Bodies. The Driver block represents a time-dependent (rheonomic) constraint on a relative degrees of freedom (DoF) between the two bodies. A Driver requires a time-dependent function to specify the relative position, velocity, and acceleration of the connected Bodies. The input of the Driver Actuator is this time-dependent function f(t) and its first two derivatives.
The Driver connects a base (B) and a follower (F) Body. The base-follower sequence determines the sense of the actuation signal. The inport is the Simulink input signal. The output is the follower you connect to the Driver block you want to actuate.
Tip You do not have to connect a Driver block to a Driver Actuator. If you do not actuate a Driver, the Driver block acts as a time-independent constraint that freezes the driven relative DoF between the Bodies at its initial value during the simulation.
Driver Actuation Requires Two or Three Input Signals
You specify the three actuation functions as a bundled Simulink input signal (which can include a signal feedback from a Sensor block) satisfying these conditions:
The signal must consist of three bundled components.
Exception: The Velocity Driver requires two bundled components.
The three components must be ordered [f(t), df(t)/dt, d2f(t)/dt2].
Exception: The Velocity Driver requires a function and its derivative [f(t), df(t)/dt].
Each successive signal component must be the time derivative of the previous component.
The meaning of f(t) depends on the connected Driver block being actuated. Select the specific Driver block for details.
Dialog Box and Parameters
The dialog has one active area, Actuation . The block parameters are not displayed unless you connect it to a specific Driver block.
Actuation
The block dialog parameters depend on the specific Driver block to which you have connected it.
Driving Linear Motion
Driving Angular Motion
Position units
In the pull-down menu, choose the units of the actuating f(t) you apply to the relative motion of the
bodies. The default is m (meters).
Velocity units
In the pull-down menu, choose the units of the actuating df(t)/dt you apply to the relative motion of the bodies. The default is m/s (meters/second).
Acceleration units
In the pull-down menu, choose the units of the actuating d 2f(t)/dt 2 you apply to the relative motion of the bodies. The default is m/s 2 (meters/second
2).
Angular units
In the pull-down menu, choose the units of the actuating f(t) you apply to the relative motion of the
bodies. The default is deg (degrees).
Angular velocity units
In the pull-down menu, choose the units of the actuating df(t)/dt you apply to the relative motion of the bodies. The default is deg/s (degrees/second).
Angular acceleration units
In the pull-down menu, choose the units of the actuating d 2f(t)/dt 2 you apply to the relative motion of the
Example
Here is a Driver Actuator connected to a Distance Driver, which connects two Bodies:
You must add an Actuator port (connector port) to the Driver block to connect the Driver Actuator to it. The base
(B)-follower (F) Body sequence on the two sides of the Driver determines the sense of the Driver Actuator data.The Driver Actuator drives the relative motion between the two Bodies connected to the Driver. The nature of the connected Driver block determines the exact meaning of the actuation data, including the choice of units.See Also
Body Actuator , Constraint & Driver Sensor , Joint Actuator , Mechanical Branching Bar
See Constraints and Drivers , including Actuating a Driver .
In Simulink , see the Signal Routing Library and the Sources Library.
bodies. The default is deg/s 2 (degrees/second
2).
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