Quantcast

Documentation Center

  • Trial Software
  • Product Updates

Nonlinear Second-Order Actuator

Implement second-order actuator with rate and deflection limits

Library

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.

Dialog Box

Natural frequency

The natural frequency of the actuator. The units of natural frequency are radians per second.

Damping ratio

The damping ratio of the actuator. A dimensionless parameter.

Maximum deflection

The largest actuator position allowable. The units of maximum deflection must be the same as the units of demanded actuator position.

Minimum deflection

The smallest actuator position allowable. The units of minimum deflection must be the same as the units of demanded actuator position.

Rate limit

The fastest speed allowable for actuator motion. The units of maximum rate must be the units of demanded actuator position per second.

Initial position

The initial position of the actuator. The units of initial position must be the same as the units of 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.

Initial velocity

The initial velocity of the actuator. The units of initial velocity must be the same as 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.

Inputs and Outputs

InputDimension TypeDescription

First

 Contains the demanded actuator position.

OutputDimension TypeDescription

First

 Contains the actual actuator position.

Examples

See the Airframe & Autopilot subsystem in the aero_guidanceaero_guidance model and the Actuators subsystem in the aeroblk_HL20aeroblk_HL20 model.

Was this topic helpful?