Solving Large Multi Scale Problems in Cst Studio Suite an Aircraft App

5/22/2018 Solving Large Multi Scale Problems in Cst Studio Suite an Aircraft App

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CST COMPUTER SIMULATION TECHNOLOGY | www.cst.com

Solving Large Multi-Scale

Problems in CST STUDIO SUITAn Aircraft Application

M. Kunze, Z. Reznicek, I. Munteanu, P. Tobola, F. Wolfheimer


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New A/C concepts (fly-by-wire, all electric aircraft, )

Increasing A/C number of functions performed by electronic sy

Susceptibility of A/C to EM environments

(HIRF, Lightning, ESD, NEMP, HPM)

Increasing

A/C safety requirements

A/C development time & cost

A/C testing time & cost to comply with certification

requirements

Motivation I


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Computational electromagnetics (CEM) to

Support, improve & reduce A/C testing Determine the EM environments of A/C electronic sy

Be used for design, upgrade & design certification /

qualification of A/C

Virtual EMC test methodology for large multiscale pro

In CST STUDIO SUITE

Applied to EvektorsEV-55 Outback plane in a HIRF

environment

Motivation II


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HIRF

Virtual EMC / HIRF test

Aircraft application

Summary

Outline


5/26CST COMPUTER SIMULATION TECHNOLOGY | www.cst.com

High-intensity / high energy radiated fields (HIR

Severe external EM environmentdue to high power RF TV & Radio

Radar

Satellite communication with ground systems, ships

Impact(threats inside fuselage)

Induced currents in A/C cables

EM field penetration into A/C fuselage

HIRF I

Source: Maria Lindback, Optimisation of aircraft transfer function measurements, M.Sc. Thesis, Lund Univein coop. with Airbus France, 2004



HIRF II

Low frequency band10kHz 50MHz

A/C acts as antenna

Induced currents in

A/C cables

A/C electronics pot.affected by excessive

current levels

Medium frequency band30MHz 400MHz

Induced currents in A/C

cables

EM Field penetration into

A/C fuselage A/C electronics pot.

affected by excessive

current and EM field levels

inside fuselage

High frequ100MHz 1

EM Field p

into A/C f

A/C electr

affected bEM field le

fuselage

Frequency division of HIRF

Source: Maria Lindback, Optimisation of aircraft transfer function measurements, M.Sc. Thesis, Lund Unive

in coop. with Airbus France, 2004



HIRF test objective

To determine transfer functions Transfer function is

Induced currents/penetrated EM field in A/C over ex

EM field

10kHz 400MHz: 20 log |I/Eext| in dBA(V/m)

100MHz 18/40GHz: 20 log |Eint/Eext| in dB

Impact of an external HIRF EM field to A/C electronics f

Transfer function + external HIRF EM field

HIRF III

Source: Maria Lindback, Optimisation of aircraft transfer function measurements, M.Sc. Thesis, Lund Univein coop. with Airbus France, 2004



Objective

To support, improve & reduce A/C HIRF testing

To determine the EM environments of A/C electronic sys

To determine transfer functions by computational

electromagnetics

To support the R&D in Europe related to A/C EMC

CST is partner in the European research project High Int

Radiated Field Synthetic Environment

V: Virtual EMC / HIRF Test I

The presented work has received funding from the European communitys 7thframework

programme. (FP7/2007-2013) under grant agreement no 205294 (HIRF SE project).



Pre-Processing

CAD import & healing Model setup & mesh generation

EM Simulation

TD-HPC-Simulation

FD-HPC-Simulation

Post-Processing

2D / 3D field processing

Voltages & currents

V: Virtual EMC / HIRF Test II

Transfer functi



A: Physical aircraft

EV-55 Outback (twin turboprop)Wing span = 16.10m

Overall length = 14.35m

Height = 4.66m

Source: www.evektor.cz



A: Virtual aircraftMorphed version of EvektorsEV-55 Outback pl

Used CAD tool: CATIA v.5.18

Aircraft parts:

Fuselage

Instrument panel Pilot and passenger seats

Upholstery

Model exchange format:IGES

(other formats e.g. CATIA, STEP, also possible)



A: Pre-Processing IModel setup I Material properties

RF sources (plane wave, field sources, ) Boundary conditions (0pen, PEC, )

Frequency range: up to 3.7GHz

Open boundary

PEC (fuselage, inspanel, seat frame

Plane wave (1V/m)



A: Pre-Processing IIModel setup II

For Post-Processing Field monitors (E and Hfields, surface currents, ) Broadband current and voltage monitors

Broadband Efield and Hfield probes

Magnetic field probe in fuselage

Electric field probe on fuselage skin



A: Pre-Processing III

Hexahedral Mesh

Transient simulations

Less common: Frequency

domain simulations

Tetrahedral Mesh

Frequency domain

simulations (general

purpose 3D F-solver)

Surface Me

Integral e

methods

Structured Mesh Un-Structured Meshes

Mesh generation (i)

Mesh type is dependent on numerical algorithm (FIT, FEM, IE)


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A: Pre-Processing IV

CSTs Perfectly Boundary Approximation (PBA) and

Thin Sheet Technology (TST) allow a very good

model resolution of a relatively coarse mesh.

Hexahedral PBA mesh @ 150 MHz (min. 10 lines per wavelength)

Mesh generation (ii) PBA mesh

Material based mesh refinement for upholstery


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A: Pre-Processing V

Drawbacks

Poor spatial resolution

Smaller mesh steps required

Smaller time steps required

Increase in CPU time

Increase in memory requirement

Hexahedral staircase mesh @ 150 MHz (min. 10 lines per wavelen

Mesh generation (iii) Staircase mesh


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A: EM Simulation IHPC Hardware based acceleration techniques

MPI ComputingDistributed Computing

GPU ComputingMultithreading


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A: EM Simulation IICSTs Linux computing cluster

Architecture: 8 nodes

Gigabit-Ethernet

Per node:

2 Intel

Xeon

CPUs E5530 @ 2.40GHz 48 GiB RAM

2 NVIDIA Tesla C1060 GPUs

OS: RedHat EL5 (x64)


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A: Post-Processing IFrequency division of HIRF

LF MF HInduced currents

EM field penetration

Source: Maria Lindback, Optimisation of aircraft transfer function measurements, M.Sc. Thesis, Lund Unive

in coop. with Airbus France, 2004

10kHz 50MHz 30MHz 400MHZ 100MHz 18/


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Magnetic field strength @ 70MHz (MF)

Low EM field penetration into fuselage

A/C electronics affected by excessive induced currents in A/C

A: Post-Processing II



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Magnetic field strength @ 1000MHz (HF)

High EM field penetration into fuselage A/C electronics affected by excessive EM field levels inside fus

A: Post-Processing III



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Surface current @ 70MHz (MF)

Low EM field penetration into fuselage A/C acts as an antenna

Strong surface currents on fuselage

A: Post-Processing IV



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Surface current @ 1000MHz (HF)

High EM field penetration into fuselage Low surface currents on fuselage

A: Post-Processing V



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A: Post-Processing VI

High freq.Med. freq.Low freq.

EM fields @ field probes

Electric field probe on fuseMagnetic field probe in fu

LF: Low field penet

MF: High field penet


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M. Kunze, et al., "Solving Large Multi-Scale Problem

STUDIO SUITEAn Aircraft Application," ICEAA, pp

113, Oct. 2011.

D. Tallini, et al., "Virtual HIRF Tests in CST STUDIO S

Reverberant Environment Application," ICEAA, pp. 8

Oct. 2011.

M. Kunze, et al., "Virtual Aircraft HIRF Simulations -Aircraft Sub-System Application," accepted at EURO

Toulouse, July 2012.

http://www.cst.com

Further Reading


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Virtual EMC / HIRF tests in CST STUDIO S

support, improve & reduce A/C HIRF test

Summary

Solving Large Multi Scale Problems in Cst Studio Suite an Aircraft App

Documents

cst studio suite

ac acts

large multi scale problems

ac cables em field penetration

electric aircraft

ac number of functions

currentspenetrated em

ac fuselagehirf isource