Nonlinear Second-Order Actuator

Implement second-order actuator with rate and deflection limits

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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.

• Open Live Script

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.

• Open Live Script

Ports

Input

A_demand — Demanded actuator position

scalar | array

Demanded actuator position, specified as a scalar or array.

Data Types: double

Output

A_actual — 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