*Heading
 Muffler model for *FREQUENCY analysis, SIM=NO
 M, KG, S
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**
** PART INSTANCE: MufflerShell-1
**
*Node,nset=shell,input=muffler_shell_nodes.inp
*Element, type=S4R, input=muffler_shell_elem.inp
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*Elset, elset=MufflerShell-1_I1, generate
*Shell Section, elset=MufflerShell-1_I1, material=steel
 0.00075, 5
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*Nset, nset=shellsym,unsorted
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*Nset, nset=shellconstraint,unsorted
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*Nset, nset=shelldisp
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**
** MATERIALS
**
*Material, name=steel
*Density
 7920.,
*Elastic
 1.9e+11, 0.3
**
** BOUNDARY CONDITIONS AND CONSTRAINTS
**
*Boundary
 shellsym,zsymm
*Equation
 shellconstraint, 1, 0.176326981,  shellconstraint, 3, -1.
 shellconstraint, 2, 1.,  shellsym, 2, -1.
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**
** STEP: Step-1
**
*Step
 Step-1: Frequency Analysis
*Frequency,eigensolver=lanczos, SIM=NO
 10,100.,,1.
*Node file,nset=shelldisp,frequency=1
 U,PU
*End step