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Noise & Vibrations

Noise & Vibrations. xxx. www.tianyuantech.com www.magsoft-flux.com www.cedrat.com. Content. Inroduction Coupling LMS – Direct Method Rinciple Implementation Couping NASTRAN – Indirect Method. Introduction .

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Noise & Vibrations

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  1. Noise & Vibrations xxx www.tianyuantech.com www.magsoft-flux.com www.cedrat.com

  2. Content Inroduction Coupling LMS – Direct Method Rinciple Implementation Couping NASTRAN – Indirect Method

  3. Introduction 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

  4. 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: • MSC NASTRAN/ACTRAN • LMS Virtual.Lab

  5. How it works Support for computation PATRAN Import :File1.bulk Indirect Method NASTRAN Export: File2.bulk Forces on support Calculation and visualization of magnetic forces Direct Method Virtual.Lab File.unv Forces and support

  6. How it works in FLUX New function in a new dedicated context Menu [Computation]/[Open mechanical analysis context]

  7. 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)

  8. 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:

  9. Coupling to MSC Nastran

  10. Coupling to Virtual.Lab Post-processing Geometry Mesh Physics Solving Import of Forces from Flux Structural Model + Modal Basis Mapping to Structural Model + Vibration Response Acoustic Respons

  11. Coupling to Virtual.Lab

  12. Coupling to Virtual.Lab – A Salient Pole Motor

  13. 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

  14. 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

  15. 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

  16. 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) Acousticresponse

  17. Thank you for your interest in our modelling solutions www.tianyuantech. com info@tianyuantech.com

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