examples of numerical modeling and simulation for ... · conférence « la simulation en cem et...

Conférence « La simulation en CEM et Hyperfréquences », Salon Microwave & RF, Paris, 3-5 avril 2012

Examples of Numerical Modeling and Simulation for Automotive EMC

and RF Applications

Marco KLINGLER & Salah BENHASSINEPSA Peugeot Citroën


OverviewOverview of different simulation toolsModeling and simulation for EMC applications

Low frequency magnetic fields radiated by a rear battery cableField levels in a vehicle during vehicle immunity testsField distribution in a vehicle at different frequenciesCommon-mode currents on a 3-phase shielded harness

Modeling and simulation for RF applicationsFM radio antenna evaluationRemote central locking radio-coverage evaluationEffects of the car body on radio-coverage for a specific antennaTire pressure receiver positioning

Conclusions


Overview of some simulation codes

2D magnetostaticor electrostatic codes3D electromagnetic codes

Electrical simulation code2D multi-conductor

transmission line codeSpecific tools

and codes

Frequency-domain Time-domain





Conclusions


Low frequency magnetic fields radiatedby a rear battery cable (1)


Low frequency magnetic fields radiatedby a rear battery cable (2)

N°1 N°2 N°3

N°4 N°5 N°6

Sid

e

Base

Shaft





Conclusions


Vehicle details

Ref: www.peugeot.fr

Peugeot 508SedanLeft-hand drive5 doors

Non-athermic windscreenFull metallic roofDiesel engine


Vehicle simulation modelSurface mesh :

Wire mesh : Radius

0-thickness

Conductivity : PEC


FEKO simulation details

Sources :

Hardware :

Software :

96 CPU, 2.4 GHz, 4 clustersIn core : max 120 Gbytes RAMOut of core : max 544 Gbytes HD

v 5R.2 & 5R.3

8 dipoles (1 mm radius)Voltage source : 1VImpedance : 74Ω

Ground : PEC

11


MWS simulation detailsLines per wavelength : 10Mesh limit ratio :

Automatic + Subgriding + PBA10

Mesh Generation :

Mesh step (min , max) : ≈ 1.58 mm , ≈ 30.5 mm Refine at PEC : 2

6 384 863Mesh cells :

≈ 5.660 x 2.825 x 1.963 m3Surrounding space : 0.5 m Volume size :

Boundaries :

537 x 332 x 251Grid size :

12

Surrounding : open (add space)Ground : PEC

Open (spacing) and Electric wall (PEC)


In the glove box

-40

-30

-20

-10

0

10

20

0 100 200 300 400 500 600 700 800 900 1000

Frequency (MHz)

E / E

cal (

dB)

FEKO - Set of 6 dipoles - 1GHz

MWS - Plane wave - 1GHz

Measurement - 2 log-periodic antennas

-40

-30

-20

-10

0

10

20

0 100 200 300 400 500 600 700 800 900 1000

Frequency (MHz)

E / E

cal (

dB)




Front - Horizontal

Front - Vertical

10 d

B /

div

10 d

B /

div

M. Klingler, S. Benhassine & Y. Merle : Comparisons Between Time-Domain and Frequency-Domain Simulations Applied to an Entire Vehicle – Workshop presentation – 9th International Symposium on Electromagnetic Compatibility “EMC Europe 2010”, Wroclaw, Poland, 13-17 September 2010

13

P10


Near the battery

-30

-20

-10

0

10

20

30

0 100 200 300 400 500 600 700 800 900 1000

Frequency (MHz)

E / E

cal (

dB)




-30

-20

-10

0

10

20

30

0 100 200 300 400 500 600 700 800 900 1000

Frequency (MHz)

E / E

cal (

dB)




Front - Horizontal

Front - Vertical

10 d

B /

div

10 d

B /

div

P04

M. Klingler, S. Benhassine & Y. Merle : Comparisons Between Time-Domain and Frequency-Domain Simulations Applied to an Entire Vehicle – Workshop presentation – 9th International Symposium on Electromagnetic Compatibility “EMC Europe 2010”, Wroclaw, Poland, 13-17 September 2010


On the dash board

-40

-30

-20

-10

0

10

20

0 100 200 300 400 500 600

Frequency (MHz)

E / E

cal (

dB)

Simulation Measurement

-40

-30

-20

-10

0

10

20

0 100 200 300 400 500 600

Frequency (MHz)

E / E

cal (

dB)

Simulation Measurement

Front - Vertical

Left - Vertical

10 d

B /

div

10 d

B /

div

???M. Klingler & S. Benhassine : Comparison of Electric Field Levels Obtained Experimentally and by Simulation at Different Points in Entire Vehicles –Workshop presentation – 8th International Symposium on Electromagnetic Compatibility “EMC Europe 2008”, Hamburg, Germany, 8-12 September 2008

15

EQ3


Details of the steering column

Steering wheel Foot pedals

Electricdiscontinuity





Conclusions


Fields distribution in a vehicle at different frequencies (1)


Fields distribution in a vehicle at different frequencies (2)





Conclusions


Common-mode current on a 3-phase shielded harness

0.5m

1m

E-field observation point

3-phasesource

3-phaseload

Perfect ground plane

5cm


Shielded cable configurationCable parameters Shield parameters


3-phase harness configuration

XY coordinate


Port connections

1Ω or 10mΩ 1Ω or 10mΩ

Common modecurrent measurement

Housing tochassis

resistance


Common-mode current results

≈20-25dB impact on common-mode currents

20 d

B /

div





Conclusions


FM radio antenna evaluation

Model of the antenna proposedby the supplier

Radiation pattern for the entireEuropean FM band





Conclusions


Remote central locking radio-coverage evaluation

Mesh of the vehicle and PCB + antenna

COM2008

Radio coverage levels 60 metersaround the vehicle at 1 meter height

315 MHz or 433 MHz





Conclusions


Effects of the car body on radio-coverage for a specific antenna

Vehicle A Vehicle B


Close interactions between the antenna and its environment

Current densities

Vehicle A Vehicle B


Influence of the seats (1)Nominal position

60 d

B

Near E-field level

60 d

B

Vehicle A Vehicle B


Influence of the seats (2)11 cm backwards

Vehicle A Vehicle B

Near E-field level

60 d

B

60 d

B


Influence of the seats (3)11 cm forwards

Vehicle A Vehicle B

Near E-field level

60 d

B

60 d

B





Conclusions


Tire pressure receiver positioning (1)

60 receiver positions(3 x 5 x 4)

8 valve positions


Tire pressure receiver positioning (2) Average over the 8 valve positions

60 receiver positions

2.5

dB /

div





Conclusions


ConclusionsToday’s simulation tools offer the possibilities to solve many EMC and RF problemsThe precision of the results will mainly depend on the correctness and the representativeness of the modelsFor complex EMC and RF environments, results are often compared in a relative manner without trying to obtain the absolute valuesFor simple RF environments, absolute values can be expected for antenna input impedances and radiation patternsModeling and simulation issues are mainly industrial issues, not scientific or technical issues

examples of numerical modeling and simulation for ... · conférence « la simulation en cem et...

Documents