Reference: FrequencyInput
Model ElementA Reference_FrequencyInput defines the input to the frequency response analysis.
Description
The frequency response analysis calculates the response of the system to steady-state oscillatory excitation. The frequency input is characterized by magnitude and phase_angle. You can specify the frequency input on any marker based on forces, displacements, velocity, and acceleration.
Format
<Reference_FrequencyInput
id = "integer"
amplitude = "real"
phase_angle = "real"
type = { "FORCE" | "DISPLACEMENT" | "VELOCITY" | "ACCELERATION" }
marker_id = "integer"
dof = "integer"
rm = "integer"
/>
Attributes
- id
- Element identification number (integer>0). This number is unique among all Reference_FrequencyInput elements.
- amplitude
- Amplitude of the sinusoidal input.
- phase_angle
- Phase angle of the sinusoidal input.
- type
- Specify the type of frequency input from Force, Displacement, Velocity, or Acceleration.
- marker_id
- Specify the Reference_Marker at which the frequency excitation is to be applied.
- dof
- Specify the direction of excitation 1-6 for x,y,z, b1, b2, and b3. Multiple direction combinations are allowed.
- rm
- Specify the Reference_Marker whose coordinate system is used as the basis for defining the components of the frequency input.
Example
<Reference_FrequencyInput
id = "1"
amplitude = "1"
type = "DISPLACEMENT"
marker_id = "30102010"
dof = "123"
/>
Comments
- The frequency input should have a path or degrees of freedom in the direction specified to calculate the frequency response, or else the frequency response leads to a singular configuration.
- All output requests of type Marker_Displacement, Marker_Velocity, Marker_Acceleration and Marker_Force are the output for the frequency response analysis.