Nonlinear Second-Order Actuator
Implement second-order actuator with rate and deflection limits
Libraries:
Aerospace Blockset /
Actuators
Description
The Second Order Nonlinear Actuator block outputs the actual actuator position using the input demanded actuator position and other dialog box parameters that define the system.
Examples
Lightweight Airplane Design
Address the technical and process challenges of aircraft design using the design of a lightweight aircraft.
HL-20 with Flight Instrument Blocks and Visualization Using Unreal Engine
Model NASA HL-20 lifting body and controller modeled in Simulink® and Aerospace Blockset™, using Unreal Engine® for visualization.
Ports
Input
Ademand — Demanded actuator position
scalar | array
Demanded actuator position, specified as a scalar or array.
Data Types: double
Output
Aactual — Actual actuator position
scalar | array
Actual actuator position, returned as a scalar or array.
Data Types: double
Parameters
Natural frequency — Natural frequency
1
(default) | scalar
Natural frequency of actuator, specified as a scalar double, in radians per second.
Programmatic Use
Block Parameter:
wn_fin |
Type: character vector |
Values: scalar | double |
Default:
'1' |
Damping ratio — Damping ratio
0.3
(default) | scalar
Damping ratio of actuator, specified as a scalar double.
Programmatic Use
Block Parameter:
z_fin |
Type: character vector |
Values: scalar | double |
Default:
'0.3' |
Maximum deflection — Largest actuator position allowable
20*pi/180
(default) | scalar
Largest actuator position allowable, specified as a scalar double, in the same units as demanded actuator position.
Programmatic Use
Block Parameter: fin_max |
Type: character vector |
Values: scalar | double |
Default: '20*pi/180' |
Minimum deflection — Smallest actuator position allowable
-20*pi/180
(default) | scalar
Smallest actuator position allowable, specified as a scalar double, in the same units as demanded actuator position.
Programmatic Use
Block Parameter: fin_min |
Type: character vector |
Values: scalar | double |
Default: '-20*pi/180' |
Rate limit — Fastest speed allowable
500*pi/180
(default) | scalar
Fastest speed allowable for actuator motion, specified as a scalar double, in the units of demanded actuator position per second.
Programmatic Use
Block Parameter:
fin_maxrate |
Type: character vector |
Values: scalar | double |
Default:
'500*pi/180' |
Initial position — Initial position
0
(default) | scalar
Initial position of actuator, specified as a scalar double, in the same units as demanded actuator position.
If the specified value is less than the value of Minimum deflection, the block sets the value of Minimum deflection as the initial position value.
If the specified value is greater than the value of Maximum deflection, the block sets the value of Maximum deflection as the initial position value.
Programmatic Use
Block Parameter:
fin_act_0 |
Type: character vector |
Values: scalar | double |
Default:
'0' |
Initial velocity — Initial velocity
0
(default) | scalar
Initial velocity of actuator, specified as a scalar double, in the units of demanded actuator position per second.
If the absolute value of the specified value is greater than the absolute value of Rate Limit, this block sets the value of Rate Limit as the initial velocity value.
Programmatic Use
Block Parameter:
fin_act_vel |
Type: character vector |
Values: scalar | double |
Default:
'0' |
Extended Capabilities
C/C++ Code Generation
Generate C and C++ code using Simulink® Coder™.
Version History
Introduced in R2012a
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