Acoustic Tab

Boundary Condition Type

Notes

Displacement

Specifies the driving displacement.

The displacement multiplied by the angular frequency yields the speed.

If Frequency Dependency is selected, [Frequency-Displacement] table will show up by clicking

Speed

Specifies the driving speed.

If Frequency Dependency is selected, [Frequency-Speed] table will show up by clicking

Acceleration

Specifies the driving acceleration.

The acceleration multiplied by the angular frequency yields the speed.

If Frequency Dependency is selected, [Frequency-Acceleration] table will show up by clicking

Pressure

Specifies the driving pressure.

If Frequency Dependency is selected, [Frequency-Pressure] table will show up by clicking

Sound Pressure Level

Specifies the driving pressure by the sound pressure level.

If Frequency Dependency is selected, [Frequency-Sound Pressure Level] table will show up by clicking

Acoustic Impedance

Specifies the acoustic impedance.

If Frequency Dependency is selected, [Frequency-Acoustic Impedance] table will show up by clicking

Open Boundary

Select it for the infinite space where the sound waves travel without reflection.

The detail is explained at Open Boundary Tab of the analysis condition.

Frequency dependency cannot be specified.

Rigid Wall

Select it for the non-vibrating boundary.

Frequency dependency cannot be specified.

Frequency Dependency

Selectable for harmonic analysis with the following boundary conditions.

[Displacement], [Speed], [Acceleration], [Sound pressure level], [Acoustic impedance]

By clicking , the time dependency can be entered in the table.

Specify the incident wave

Applicable when the speed boundary is specified in the harmonic analysis.

If driving boundary conditions, such as a speed boundary condition, are specified, the state with the total of incident and reflected waves satisfying the conditions will be solved.

Then if this option is not selected, it allows the reflected waves to affect the input power. Since the amount of reflection typically varies depending on frequencies, the input power also varies depending on frequencies.

Once this option is selected, the input wave will be specified. If materials have no frequency dependency, the input power is independent of frequencies.

Note that it is not applicable to materials with loss.

Use the specific acoustic impedance calculated from material

Applicable when the acoustic impedance boundary is specified in the harmonic analysis.