3.20. Port

An acoustic Port enables you to define an exterior or interior acoustic surface in order to reuse this surface as an excitation location, a boundary, or a surface on which result are evaluated. For example, a Port can be used to launch acoustic modes or define transfer admittance connections.

Analysis Types

The Port loading condition is available for the following analysis types:

Common Characteristics

This section describes the characteristics of the boundary condition, including the application requirements, support limitations, and loading definitions and values.

Dimensional Types

3D Simulation: Supported.
2D Simulation: Not Supported.

Geometry Types: Geometry types supported for the Port boundary condition include:

Solid: Supported.
Surface/Shell: Not Supported.
Wire Body/Line Body/Beam: Not Supported.

Topology: The following topology selection options are supported for Port.

Body: Not Supported.
Face: Supported.
Edge: Not Supported.
Vertex: Not Supported.
Nodes: Not Supported.
Element Face: Not Supported.
Element: Not Supported.

Loading Data Definition: The Port boundary condition is defined as a constant only.

Boundary Condition Application

To apply a Port:

On the Environment Context tab: select Acoustic Boundary Conditions > Port. Or, right-click the Environment tree object or click in the Geometry window and select Insert > Acoustics > Port.
Define the attributes of the Port.

Details View Properties

The selections available in the Details view are described below.

Category	Fields/Options/Description
Port Surfaces	Scoping Method, options include: Geometry Selection: Default setting, indicating that the boundary condition is applied to a geometry or geometries, which are chosen using a graphical selection tools. Geometry (Face selection only): Visible when the Scoping Method property is set to Geometry Selection. Geometry selections must be made on bodies specified in the acoustic Physics Region. Use the Face selection filter to pick your geometry, click in the Geometry field, and then click the Apply button that displays. After you select the geometry, this property displays the geometric entities (1 Face, 3 Faces, etc.). Named Selection: Indicates that the geometry selection is defined by a Named Selection. Named Selection: Visible when the Scoping Method is set to Named Selection. This field provides a drop-down list of available user–defined Named Selections (face-based only). Port Position: Options include On Exterior Face (default) and On Interior Face.
Inside Surface Bodies	Scoping Method, options include: Geometry Selection: Default setting, indicating that the boundary condition is applied to a geometry or geometries, which are chosen using a graphical selection tools. Geometry (Body selection only): Visible when the Scoping Method property is set to Geometry Selection. Geometry selections must be made on bodies specified in the acoustic Physics Region. Use the Body selection filter to pick your geometry, click in the Geometry field, and then click the Apply button that displays. After you select the geometry, this property displays the geometric entities (1 Body, 3 Bodies, etc.). Named Selection: Indicates that the geometry selection is defined by a Named Selection. Named Selection: Visible when the Scoping Method is set to Named Selection. This field provides a drop-down list of available user–defined Named Selections (body-based only).
Definition	Type: Read-only field that describes the object – Port. Port Behavior: Options include Transparent (default) and Vibro. Suppressed: Include (No - default) or exclude (Yes) the boundary condition.

Mechanical APDL References and Notes

This boundary condition is applied using the PORT label of SF (Exterior port) or BF (Interior port) commands. Refer to the Surface Port section in the Mechanical APDL Acoustic Analysis Guide for more information.

API Reference

See the Port section of the ACT API Reference Guide for specific scripting information.