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

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

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