Acceleration sensor

Absolute angular acceleration of the flange.

  • signal
  • rotational
  • Modelica Standard Library
  • 2 ports
BlockAcceleration sensorKindrotAccSensorLibraryRotational

Description

Measures the absolute angular acceleration of the flange without loading it.

Example

Rotational drivetrain A torque step drives a motor inertia through a 2:1 gear and a shaft spring into a damped load, with every rotational sensor.

Torque 1 N·mMotor 0.01 kg·m²Gear 2:1Shaft powerShaft torqueShaft 1000 N·m/radLoad 0.04 kg·m²Friction 0.1FrameMotor accelerationShaft twist rateLoad speed
In Gradara, select a Acceleration sensor block and press F1, then choose Open example. It opens as a new model in My models, ready to run.

Also in this example:Torque sensorFixed (rotational)Torsion springTorsion damperInertia (ideal)Ideal gearTorque stepSpeed sensor (ideal)Power sensor (rotational)Relative speed sensor

Ports

Outputs 1

  • αasignal · rad/s²

    Angular acceleration, in rad/s².

Conserving terminals 1

  • shaftflangerotational

    Measured flange. No torque is exchanged.

Equations

Modelica
a = d²(flange.phi)/dt²
flange.tau = 0

Implementation

Modelica Standard Library 4.1.0Modelica.Mechanics.Rotational.Sensors.AccSensor
MSL documentation

Assumptions and limitations

  • The angle is differentiated twice, so the output jumps wherever the applied torque jumps.

See also

Select a block in Gradara and press F1 to open its page offline.