Nonlinear Second-Order Actuator

Implement second-order actuator with rate and deflection limits

expand all in page
  • Library:

  • Aerospace Blockset / Actuators

  • Nonlinear Second-Order Actuator block

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.

Ports

Input

expand all

Demanded actuator position, specified as a scalar or array.

Data Types: double

Output

expand all

Actual actuator position, returned as a scalar or array.

Data Types: double

Parameters

expand all

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 of actuator, specified as a scalar double.

Programmatic Use

Block Parameter: z_fin
Type: character vector
Values: scalar | double
Default: '0.3'

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'

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'

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 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 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'

Model Examples

Lightweight Airplane Design

Lightweight Airplane Design

How to use MathWorks® products to address the technical and process challenges of aircraft design using the design of a lightweight aircraft.

Open Model
HL-20 with Simulink® 3D Animation™ and Flight Instrumentation Blocks

HL-20 with Simulink® 3D Animation™ and Flight Instrumentation Blocks

NASA's HL-20 lifting body and controller modeled in Simulink®, Aerospace Blockset™, and Simulink® 3D Animation™ software. This model simulates approach and landing flight phases using an auto-landing controller. The Visualization subsystem uses aircraft-specific gauges from the Aerospace Blockset™ Flight Instrumentation library.

Open Model

Extended Capabilities

C/C++ Code Generation
Generate C and C++ code using Simulink® Coder™.

See Also

Topics

Introduced in R2012a

Aerospace Blockset Documentation

Support