﻿ View by the Directivity Calculation MethodExamples | Product | Murata Software Co., Ltd.

# Example8View by the Directivity Calculation Method

### General

• View the analysis results by the directivity calculation method.

• Unless specified in the list below, the default conditions will be applied.

### Analysis Space

 Item Settings Analysis Space 3D Model unit mm

### Analysis Conditions

 Item Settings Solver Acoustic Analysis [Mach] Analysis Type Static analysis Options N/A

 Tab Setting Item Settings Harmonic Analysis Frequency Minimum: 5[KHz] Maximum: 5[KHz]

### Graphical Objects

The model is to observe how the speaker’s sound travels for 1-meter distance in the air.

An area is extracted from the spherical ambient air for a speaker’s domain. Therefore, a body of speaker does not exist. The driving source is set at the pressure of 1 [Pa]. For easy viewing of the inside of the model, the open boundary condition is hidden. The directivity domain consists of two sheet bodies.

### Body Attributes and Materials

 Body Number/Type Body Attribute Name Material Name 2/Solid Air 000_Air(*) 5/Solid Air 000_Air(*) 6/Solid Air 000_Air(*) 9/Sheet OUTSIDE 000_Air(*) 10/Sheet OUTSIDE 000_Air(*)

* Available from the Material DB

 Body Attribute Name Analysis Domain OUTSIDE Select “Use directivity calculation method”

• If “Use directivity calculation method” is selected, such body will be recognized as the domain for the directivity calculation. The material “000_Air” is specified for this body but not used for the calculation. The simulation is performed assuming that the body material with open boundary condition exists in the outside of the boundary.

### Boundary Conditions

 Boundary Condition Name/Topology Tab Boundary Condition Type Settings F/Face Acoustic Pressure 1[Pa] Open/Face Acoustic Open boundary

### Results

The contour of the directivity domain has been made.

The sound pressure distribution in the wide space can be observed by using the directivity domain.

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