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Example12 Acoustic Impedance

General

  • Acoustic impedance is set on Exercise 2’s model to see the effect of air resistance.

     

 

Analysis Space

Item

Settings

Analysis Space

3D

Model unit

mm

 

Analysis Conditions

Item

Settings

Solvers

Piezoelectric Analysis [Rayleigh]

Analysis Type

Harmonic analysis

Options

N/A

The harmonic analysis tab is set up as follows.

Tab

Setting Item

Settings

Harmonic analysis

Frequency

Minimum: 5.6×10^3[Hz]

Maximum: 5.7×10^3[Hz]

Step

Select “Linear step by division number”.

Division number: 50

Model, Body Attributes and Materials – same as Exercise 2

Boundary Conditions

Boundary Condition Name/Topology

Tab

Boundary Condition Type

Settings

Outer Boundary Condition

Mechanical

Acoustic Impedance

409.7[Pa*s/m]

earth/Face

Electric

Electric wall

Voltage specified:

Voltage 0[V]

hot/Face

Electric

Electric wall

Voltage specified:

Voltage 1[V]

hot/Face

Mechanical

Acoustic Impedance

409.7[Pa*s/m]

 

The outer boundary condition and “hot” ad set with the “acoustic impedance” boundary condition.

409.7[Ns/m3] is the acoustic impedance of air.

Results

For comparison, the simulation is done for the acoustic impedance of 0[Ns/m3] and 100[Ns/m3] as well as 409.7[Ns/m3].

The frequency characteristics of electric impedance are plotted below.

 

 

 

 

The right figure is a blow up of the left.

Note that the legends of the series titles are not created by the graphing software.