Simcenter 3D Solutions Differences between "Distributed Acoustic Volume Quadrupole" and "Acoustic Volume Quadrupole"?
2022-07-18T21:28:55.000-0400
Simcenter 3D
Summary
This article explains differences between "Distributed Acoustic Volume Quadrupole" and "Acoustic Volume Quadrupole"
Details
In Aero-acoustic analysis, users have access to both "Distributed Acoustic Volume Quadrupole" and "Acoustic Volume Quadrupole":
Both Quadrupole loads are writing out the same Nastran card. However, in order to simplify to create multiple subcases at once, SC3D introduced the Distributed Acoustic Volume Quadrupole. The Distributed Acoustic Volume Quadrupole is only available under the Distributed Quadrupole subcase.
For example, if you have 1000 cgns files and if you want to create 3 subcases with 1-500, 251-750 and 501-1000, you can:
Either
So, both will give same results. The distributed one will make the life easier.
You can still add Quadrupoles (not distributed one) under Distributed Quadrupole Subcase, but you will be defining the time range twice, therefore no need to do that. We recommend using distributed quadrupole subcase and load for the most user-friendly solution creation (less effort since it will automate it at the export).
Both Quadrupole loads are writing out the same Nastran card. However, in order to simplify to create multiple subcases at once, SC3D introduced the Distributed Acoustic Volume Quadrupole. The Distributed Acoustic Volume Quadrupole is only available under the Distributed Quadrupole subcase.
For example, if you have 1000 cgns files and if you want to create 3 subcases with 1-500, 251-750 and 501-1000, you can:
Either
- Create three Direct Frequency Subcase
- Create separate “Quadrupole” load in each subcase
- In each quadrupole load, define the time/sample range as 1-500, 251-750 and 501-1000 manually
- Solve the problem for the multi subcase
- Create a single Distributed Quadrupoles subcase
- In the subcase, in the time range tab, select 500 samples with 50% overlap
- Create one Distributed quadrupole load
- No need to define the time range again. This will create 3 subcases in the dat file
- Solve the problem with this setup
So, both will give same results. The distributed one will make the life easier.
You can still add Quadrupoles (not distributed one) under Distributed Quadrupole Subcase, but you will be defining the time range twice, therefore no need to do that. We recommend using distributed quadrupole subcase and load for the most user-friendly solution creation (less effort since it will automate it at the export).
Associated Components
Acoustics
Additive Manufacturing
Assembly FEM
Correlation and Updating
Durability
Electromagnetics (High Frequency)
Electromagnetics (Low Frequency)
Flexible Pipe
Laminate Composites
Margin of Safety
Motion
Multiphysics
NX Open
Nonlinear
Optimization
Pre/Post
Response Dynamics
Rotor Dynamics
Samcef Environment
Simulation Process Management
Thermal / Flow