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Noise & Vibrations. xxx. Content. Inroduction Coupling LMS – Direct Method Rinciple Implementation Couping NASTRAN – Indirect Method. Introduction .

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Noise & Vibrations




Coupling LMS – Direct Method



Couping NASTRAN – Indirect Method


Today, motors are used in many applications close to the user. The noise pollutes the environment of the user. It is a nuisance that must be mitigated.

Origin of the noise in motors:

  • Driving electronic
  • Torque ripple on gears
  • Electromagnetic forces on stator
  • Coils

To reduce the noise level, a clear identification of the noise and its source is needed.

FLUX is connected to vibrational tool

how it works
How it works

Export magnetic forces computed by FLUX to mechanical CAE tools for vibro-acoustic studies.

Flux applications:

  • 2D Transient Magnetics
  • 3D Transient Magnetics
  • SKEW Transient Magnetics

mechanical CAE tools:

  • LMS Virtual.Lab
how it works1
How it works

Support for computation


Import :File1.bulk

Indirect Method


Export: File2.bulk

Forces on support

Calculation and visualization of magnetic forces

Direct Method



Forces and support

how it works in flux
How it works in FLUX

New function in a new dedicated context

Menu [Computation]/[Open mechanical analysis context]

coupling to msc nastran
Coupling to MSC Nastran

Magnetic pressures: Maxwell tensor

Only for the rotating machines.

Computed in the air gap.

On a circle (2D) or a cylinder (3D et Skew)

coupling to msc nastran1
Coupling to MSC Nastran

Vibro-acoustic analysis must be performed on a full mechanical cycle (360°mech).

The time sampling and the mesh must be set to take into account:

  • space harmonics.
  • time harmonics

Computation in FLUX can be performed using periodicities. The signal is automatically rebuilt to the full mechanical cycle.

Magnetic pressures will be calculated in the airgap, tangential and normal comp.

Normal component:

Tangential component:

coupling to virtual lab
Coupling to Virtual.Lab






Import of Forces from Flux

Structural Model + Modal Basis

Mapping to Structural Model + Vibration Response

Acoustic Respons

coupling to virtual lab2
Coupling to Virtual.Lab

The UNV file containing the EM Surface Mesh and time domain forces is imported in LMS Virtual.Lab Acoustics

The user can inspect the force distribution per time step and animate the forces in time domain

coupling to virtual lab3
Coupling to Virtual.Lab

Contains stator, windings, end caps, housing

One homogenized but orthotropic material is chosen to model the stator (stiffness)

In first instance, a modal basis is used to capture the dynamics of the structure

Structural model + Modal basis

coupling to virtual lab4
Coupling to Virtual.Lab

LMS Virtual.Lab maps the EM Forces conservatively from the EM surface to the coarser structural mesh surface

A Fourier transform provides frequency domain forces

These forces are used to compute the vibration response

Forces mapping to structural model + Modal basis

coupling to virtual lab5
Coupling to Virtual.Lab

LMS Virtual.Lab Acoustics further computes the acoustic radiation:

  • SPL
  • Sound Power
  • Directivity

Enabling technologies ensuring a fast acoustic simulation result: FEM Acoustics, AML (PML technology)

The results show clearly the harmonic content (7500 RPM  stator teeth freq = 6 kHz, rotor pole freq = 500 Hz) of the forces as well as the modal content of the structure (eg first breathing mode around 3 kHz)



Thank you for your interest in our modelling solutions

www.tianyuantech. com