Electric motor vibro-acoustics analysis workflow

You can solve for the vibro-acoustic response of an electric motor using multiple RPMs or multiple order cuts.

Step	Summary	Detailed help topic
1.	In Simcenter Motorsolve, compute the behavior of an electric motor across multiple RPMs and export the electromagnetic forces as a waterfall of loads in a .unv file.
2.	In Simcenter 3D, create an assembly FEM.	Create a component FEM to represent the electric motor. Create a second component FEM to represent the fluid.	Alternate representation (component FEM file)
3.	Change the electric motor and fluid component FEM files.	Use Edit Representation to change the component representations. Edit the following:The electric motor FEM and change it to a mode set.The acoustic fluid FEM and change it to an ATV set.	Replace a FEM file with a mode set or FRF set Replace different FEM files with an ATV set or VATV set
4.	Create a Simulation file and make it the work part.		Create a new Simulation file
5.	Create a Model and Load Pre-processing solution.	Use the electromagnetic waterfall .unv file that you created in Simcenter Motorsolve. Create one of the following:Waterfall loads of multiple RPM subcases, which you can use to create waterfall responses of acoustic power.Multiple order cut subcases, which you can use to create results from which you can plot Campbell diagrams.	Model and Load Pre-processing solution process
6.	Create the loads using the electromagnetic .unv file.	To create loads for multiple RPMs:In the Model and Load Pre-processing solution, import the electromagnetic waterfall .unv file Create a Time Signal process to convert the time signal to frequency as a repeating signal.Create a Load Extrusion process to convert the forces from the Motorsolve 2D motor representation to a 3D FEM representation.Perform Mesh Mapping from the extruded electric motor mesh to the FEM structure meshSolve the Model and Load Pre-processing solution.You will later use the output .sc_h5 file with a Load Recipe to create multiple RPM subcases. To create loads for multiple order cuts:In the Model and Load Pre-processing solution, import the electromagnetic waterfall .unv file Create a Time Signal process to convert the time signal to frequency as a repeating signal.Convert the Waterfall of Frequency to Order Cut data.Create a Load Extrusion to convert the forces from the Motorsolve 2D motor representation to a 3D FEM representation. Perform Mesh Mapping from the extruded electric motor mesh to the FEM structure meshSolve the Model and Load Pre-processing solution.You will later use the output .sc_h5 file with a Load Recipe to create the frequencies of the multiple order cut subcases.	Transforming time-domain to frequencyTransform pre-computed 2D electromagnetic forces into loadsMapping of result data between meshesExtracting order cut data
7.	Create a new solution.	Create a Simcenter Nastran SOL 108 Direct Frequency Response or SOL 111 Modal Frequency Response solution.
8.	Specify the file reference.	In the Solution dialog box, from the Load or Boundary Condition Type list, select File Reference.By selecting File Reference, you specify that the loads will come from a load recipe.
9.	Request the types of results to output	You can specify output requests both for the solution and for individual solution steps.	Requesting output for Noise and Vibration analyses
10.	Set the solution units.	Right-click the solution and select Edit Advanced Solver Options. From the Units list, select (N)(m)(kg).Note: The units of the electromagnetic loads .unv file you exported from Motorsolve are in (N)(m)(kg), so you must use consistent units in the solution.	Adjust advanced solver options
11.	Create a load recipe.	Create a Load Recipe to create the frequencies of the multiple-RPM subcases or multiple-order cut subcases using the .sch5 file.	Create a load recipe from a data source
12.	Create forcing frequencies.	Create a forcing frequency modeling object to create a linear sweep by RPM.	Create a modeling object Forcing Frequencies dialog box (Noise and Vibration)
13.	Solve the solution	Solve the solution to generate the analysis results.	Solve the model
14.	Post-process the results	For a multiple-RPM solution, you can:Create waterfall results of pressure, power, displacement, and so on.Create an XY plot, where the X-axis is orders.Create waterfall to order cut function plots. For a multiple-order cuts solution you can:Create results of pressure, power, displacement, and so on.Create Campbell diagramsCreate an XY plot, where the X-axis is RPM.	Scenario-based post-processing

Learn more

Simcenter Nastran FEM acoustics

FEM acoustics workflow

FEM vibro-acoustic workflow

Checking your FEM acoustics model prior to solving

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Electric motor vibro-acoustics analysis workflow, Simcenter 3D 2021.1 Series

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