# Boundary Condition: Force

## Function:

Applies an external force.

## Application:

Point.
Line and Surface forces are not yet implemented.

## Description:

Each component of the force (along the global X, Y, and Z axes) can be defined.
For each component, select among the following options: None, or Forced.
- None: No condition is applied along this component direction.
- Forced: Enter values to define the Amplitude (A) and Phase (P) of the forcing function.

## Remarks:

- The amplitude (A) of the force is in newtons. The phase (P) is in degrees.
- If the amplitude is zero (A = 0) then the condition is ignored.
- Only sinusoidal [A × sin (ω × t + P)] forcing functions are allowed. Transient and user-defined forcing functions are not yet implemented.
- If a force is defined at a node that is part of a symmetry plane, then the magnitude of that force must be divided by the appropriate factor of symmetry

## Illustration:

## ATILA Equivalent:

For a Forced condition, the ATILA equivalent is a LOADS in the form N F RE IM, where N is the node number where the constraint is applied, F is LOADX, LOADY or LOADZ depending on the component, and RE = P × cos (P) and IM = P × sin (P) are the real and imaginary parts of the forcing function.

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