﻿﻿ Harmonic Analysis of Standing Barsexamples｜products｜Murata Software Co., Ltd. Example16Harmonic Analysis of Standing Bars General

• Forced oscillation is applied on two standing bars.

• The resulting vibrations are analyzed.

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

Analysis Space

 Item Settings Analysis Space 3D Model unit mm

Analysis Conditions

The analysis type is the harmonic analysis.

 Item Settings Solvers Mechanical Stress Analysis [Galileo] Analysis Type Harmonic analysis Options N/A

The resonant frequencies of each tower are 1250[Hz] and 1650[Hz], which are acquired by individual analyses.

Therefore, the sweep range is around those frequencies.

The harmonic analysis is set as follows.

 Tab Setting Item Settings Harmonic analysis Frequency Minimum: 1000[Hz] Maximum: 2000[Hz] Step Linear step: Division number: 20

Model

Two bars (TOWER) are standing on a plate (GROUND).

The boundary condition is set on the face topology of GROUND to force the displacement in the Y direction. It is named VIBE_Y Body Attributes and Materials

 Body Number/Type Body Attribute Name Material Name 0/Solid TOWER 001_Al * 1/Solid TOWER 001_Al * 2/Solid GROUND 001_Al *

* Available from the Material DB

Boundary Conditions

The forced displacement is applied on on the face of GROUND in the Y direction. The displacement in X and Z directions are fixed.

 Boundary Condition Name/Topology Tab Boundary Condition Type Settings VIBE_Y/Face Mechanical Displacement Select all X/Y/Z components. UX=UX=0.0, UY=1×10^-3[m]

This means the magnitude of Y displacement is 1[mm].

Results

The displacement diagrams are shown below. The oscillation frequencies are 1000[Hz], 1250[Hz], 1450[Hz], 1600[Hz] and 2000[Hz] respectively.

The contour diagram shows the displacement.

1000[Hz] 1250[Hz] 1450[Hz] 1600[Hz] 2000[Hz] The displacement is high at the resonant frequencies: 1250[Hz] and 1600[Hz]. (Watch out for the color scales)

The vibrations are out of phase for the non-resonant frequencies.

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