Predicting and simulating noise€œThanks to LMS Engineering and the optimization process they used...

Restricted © Siemens AG 2017

Predicting and simulating noiseIntegrated vibro- and aero- acoustic approach

Simcenter 3D AcousticsRobin Boeykens

Francois Iker

Realize innovation.Unrestricted © Siemens AG 2017

Unrestricted © Siemens AG 2017

Siemens PLM Software

Introducing Simcenter™ Portfolio

for Predictive Engineering Analytics

Simcenter™DIGITAL TWINPHYSICAL TWIN



Simcenter 3D

3D CAE for the digital twin

Multi-discipline integration

Best-in-class simulation modeling

Openness and scalability

Leading in system simulation

Leverage industry expertise



Acoustic simulation

Why is it important?

Acoustic comfort, Sound

quality: part of brand

Regulation: pass-by-noise,

wayside, ICAO

Cost reduction

E.g. less material

Mass customization,

Variant explosionFailure reduction

Fuel economy

Lightweight



Simcenter 3D Acoustics

Engineering View: Source – System Transfer – Receiver

ReceiverSystemSource

Mechanical Finite Element Vibro-Acoustics

Acoustic

Electromagnetics

Boundary Element Vibro-Acoustics

Structural Acoustics

Contributions

Directivity

Functions

Sensors



Vibro-Acoustics Engineering

An end-to-end process

1) CAD-based pre2) Structural meshing,

assembly

3) Acoustics meshing,

boundary conditions

6) Post-process: check requirements, get

insights

7) What-if, optimization, feedback to designer

4) Link with EM

5) Solving




Process View

Geometry

Preparation

Synchronous

modeling, closing

holes, removing

blends, parts,...

Meshing and

Assembly

Assembly FEM,

surface wrap,

acoustic

meshing,…

Structural and

Acoustics Pre

LBCs, advanced

vibro-acoustics

coupling,…

Solving

Acoustics

Vibro-Acoustics

FEM

AML / FEMAO / ATV

BEM

Post-processing

Both vibrations and

acoustics

Contribution analysis

What-if, optimization, feedback to designer




Process View

Geometry

Preparation

Synchronous

modeling, closing

holes, removing

blends, parts,...

Meshing and

Assembly

Assembly FEM,

surface wrap,

acoustic

meshing,…

Structural and

Acoustics Pre

LBCs, advanced

vibro-acoustics

coupling,…

Solving

Acoustics

Vibro-Acoustics

FEM

AML / FEMAO / ATV

BEM

Post-processing

Both vibrations and

acoustics




Create the Acoustics MeshUsing Wrapping Technology

Key highlights

- Create acoustic mesh (BEM

or FEM) of very complex

systems

- Start either from given mesh

or from given geometry

- Control key parameters such

as global resolution

- Contact prevention, local

resolution, auto refinement

constraint




Process View

Geometry

Preparation

Synchronous

modeling, closing

holes, removing

blends, parts,...

Meshing and

Assembly

Assembly FEM,

surface wrap,

acoustic

meshing,…

Structural and

Acoustics Pre

LBCs, advanced

vibro-acoustics

coupling,…

Solving

Acoustics

Vibro-Acoustics

FEM

AML / FEMAO / ATV

BEM

Post-processing

Both vibrations and

acoustics




Simcenter 3D

Multi-discipline integration

Structures

NVH &

Acoustics

Thermal

Flow

Composites

Motion

Rotor

Dynamics

Durability

Optimization

1D – 3D

Co-Simulation

TEST-CAE

Correlation

Multiphysics

Linear FEM Non-Linear FEM BEM Multi-body Fatigue Thermal CFD



Real LoadsUse ‘as simulated’ or ‘as measured’ load data for vibro-acoustic predictions

Simcenter 3D



Simcenter™ Engineering services – LMS & CD-adapco

Experience and global talent for valued customer partnerships

Troubleshooting

Co-development

Technology

transfer

Engineering

process

transformation

Performance

Engineering

Noise & Vibration

Durability

Fuel

consumption

Mechatronics

development

CFD

Combustion



Simcenter™ Portfolio for Predictive Engineering Analytics

Combining Simulation and Test

Validate Simulation with real-life Tests

I. Test FOR Simulation

Combined use of Test and Simulation

II. Test WITH Simulation III. Simulation FOR Test

Simulation for productive & realistic Test

&IV. Throughout the Development Process and beyond f.i. coupling with Customer Usage

Cu

sto

mer U

sag

e

data

Cu

sto

mer U

sag

e d

ata

IOT / Cloud /

Data analytics



New motors generation for automotive propulsion

Punch Powertrain

Using LMS Engineering services and tools to cut development time by a

factor of 2

• Reduced total development time by

at least 50 percent

• Developed new generation of

motors with better NVH

performance

• Implemented a new simulation-

based process with knowledge

transfer

“Thanks to LMS Engineering and the optimization process they used with LMS

Virtual.Lab, we are now working on a new generation of commercially competitive

switched reluctance motors for automotive propulsion.”

Diederik Brems, Mechanical Engineer

• Couple the vibro-acoustic model with the electromagnetic model

• Combine test and simulation for the creation of validated simulation models

Developing a powerful partnershipSwitched reluctance motors challenge NVH

performance



Punch Powertrain

Using LMS Engineering services and tools to cut development time by a

factor of 2

BELGIAN SOLAR TEAM THIRD IN WORLD

CHAMPIONSHIP FOR SOLAR CARS

NVH Electrification

Predict structural and acoustic loading of an electric powertrain

Restricted © Siemens AG 2017 All rights reserved




Process View

Geometry

Preparation

Synchronous

modeling, closing

holes, removing

blends, parts,...

Meshing and

Assembly

Assembly FEM,

surface wrap,

acoustic

meshing,…

Structural and

Acoustics Pre

LBCs, advanced

vibro-acoustics

coupling,…

Solving

Acoustics

Vibro-Acoustics

FEM

AML / FEMAO / ATV

BEM

Post-processing

Both vibrations and

acoustics




Boundary Element Method (BEM)Acoustics domain by surface elements


Technology View

Finite Element Method (FEM)Acoustics domain by 3D, volumetric elements, AML

For Interior and/or Exterior – enables fast solving Exterior – enables efficient meshing




Technology View

Unique, AML technology – and BEM technology

Significant performance, lowering development cost




AML (Automatically Matched Layer)

𝝆𝒄 AML

Model

size500k DOFs 80k DOFs

CPU

time

X

s/freq

X / 20

s/freq

• AML auto-creates layer at solver level, which fully absorbs

outwards traveling waves

• Yields accurate results in regular (red) FEM domain first

• Then, post-processing yields results outside the FEM domain

• Layer is allowed to be put very close to radiator

Lean and FAST FEM models



H-Matrix BEMRandom Vibro-Acoustics Fast Multipole BEM

FEMAO ATVFEM AML


Technology View



Simcenter 12 Acoustics

FEMAO

Full vehicle exterior acoustics

Submarine sonar scattering

FEM mesh FEMAO mesh

• FEM AO, the next generation FEM Acoustic solver

• Higher element order, automatically adapted by solver

• Leaner models in pre-processing

• Faster at lower frequencies, more efficient at higher frequencies

• 2 to 10 x faster compared to FEM AML



FEMAO application example

Prediction of acoustic transfer functions of an engine bay

for pass-by noise

Standard FEM FEMAO

Frequencies 100 – 2500 Hz 100 – 2500 Hz

Solving time 97 min 22 min

20

30

40

50

60

70

80

90

100 200 400 800 1600

FEM

FEMAO




Process View

Geometry

Preparation

Synchronous

modeling, closing

holes, removing

blends, parts,...

Meshing and

Assembly

Assembly FEM,

surface wrap,

acoustic

meshing,…

Structural and

Acoustics Pre

LBCs, advanced

vibro-acoustics

coupling,…

Solving

Acoustics

Vibro-Acoustics

FEM

AML / FEMAO / ATV

BEM

Post-processing

Both vibrations and

acoustics




Simcenter 3D Acoustics Key Capabilities

NX Nastran based FEM solution for Vibro-Acoustics

NASTRAN with SYSNOISE FEM Solver embedded

ONE Model

ONE Pre/Post

One Solve

Structural Eigen Modes Vibration/Stress

Noise Radiation Sound Power



Post-processing


Standard Post Contribution Analysis providing Focus

3D Images and 2D Graphs

3D Images

Grid Contributions

Energy Contributions

Panel Contributions

Modal Contributions




Process View

Geometry

Preparation

Synchronous

modeling, closing

holes, removing

blends, parts,...

Meshing and

Assembly

Assembly FEM,

surface wrap,

acoustic

meshing,…

Structural and

Acoustics Pre

LBCs, advanced

vibro-acoustics

coupling,…

Solving

Acoustics

Vibro-Acoustics

FEM

AML / FEMAO / ATV

BEM

Post-processing

Both vibrations and

acoustics





Fast What-if

with Synchronous Technology

Key highlights

- Noise performances

indicators fully associative

with CAD: including

automatic re-meshing, LBCs

- Integrated extensive 3D

CAD modeling

- Synchronous Technology:

implement design

modifications without need

for history … and for ANY

CAD




Process View

Geometry

Preparation

Synchronous

modeling, closing

holes, removing

blends, parts,...

Meshing and

Assembly

Assembly FEM,

surface wrap,

acoustic

meshing,…

Structural and

Acoustics Pre

LBCs, advanced

vibro-acoustics

coupling,…

Solving

Acoustics

Vibro-Acoustics

FEM

AML / FEMAO / ATV

BEM

Post-processing

Both vibrations and

acoustics





Random Vibro-AcousticsSpacecraft Mission De-risking

Enclosure / Panel DesignPanel Transmission Loss, Insertion Loss

Cabin AcousticsCars, tractors, excavators

Full Vehicle Radiation / ScatteringPass-by Noise, pedestrian safety,

submarine scattering

Duct (Vibro)AcousticsIntake/ exhaust/ muffler Transmission Loss,

orifice noise and shell noise

Machinery Noise RadiationEngine, E-motor, compressor, pump..


Application View



Making noise reduction a priority

Donaldson

Enabling filtration systems provider to streamline acoustic studies

• Saved significant time and money

by performing acoustic studies in

just hours

• Used acoustics know-how to

procure global R&D contracts

• Validate models and fine-tuned

overall approach to acoustics

testing

“LMS Engineering services have been with us every step of the way with technical

assistance to validate models and fine-tune our overall approach.”

Gert Proost, Engineering Manager

• Bring acoustic simulation in-house

• Use Siemens PLM Software products and services

Complete air intake systems development,

optimized to meet rigorous noise limits

Insight into the acoustic behavior of the

entire system












Application View



Experimental and numerical acoustic analysis

John Deere

Enabling resolving excessive cab noise

• Developed approach for addressing

acoustic issues early in the

development process

• Quickly and efficiently identified

effects that lead to loud cab noise

• Enabled better understanding of the

complex acoustic system

“We were able to identify the sensitivities of the different effects contributing to

the cab noise phenomenon much faster and more efficiently through our

cooperation with LMS Engineering services.”

Dr. Ing. Christian von Holst, Group Leader, Suspension Systems

• Use a combination of experimental and numerical acoustic analysis techniques

• Use LMS Engineering services and LMS software to identify and resolve issues

Acoustics simulationNVH testing



Bobcat Company

Fan Noise Prediction for Off-Highway Vehicle

“Fan Noise Prediction for Off-Highway Vehicle”

Dirk von Werne, Siemens Industry Software; Prasanna Chaduvula, Siemens PLM Software; Patrick

Stahl, Michael Jordan, Jamison Huber, Bobcat Company; Korcan Kucukcoskun, Mircea Niculescu,

Siemens Industry Software, SAE international conference 2017.

• Siemens worked together with Bobcat/Doosan on

building a simulation model of a off-highway cooling

device

• Computational Fluid Dynamics – CFD and

acoustics FEA are used

• Validation of measurement vs Simulations is

also performed



Bobcat Company


Simulation vs Measurement

MICROPHONES

FAN – CFD results

Process Flow

AML Micorphones



Bobcat Company


Exterior Interior (different scale)

Prediction of Sound Pressure Good correlation in most frequency bands












Application View



Simcenter Acoustics Key Capabilities

Unique Combination of Process Efficiency and Expertise

Simcenter 3D provides a highly efficient end-to-end process

complemented with high fidelity simulations

FEM

BEM

Acoustics

Vibro-Acoustics

Range: structural and acoustics meshing, synchronous modeling, FEM & BEM, contribution analysis,…

Depth: Acoustic Technologies: FEM AML, Automatic FSI, FEM AO, Fast Multipole BEM, H-Matrix BEM,...

AssemblyCAD Meshing Pre-processing Solver Post

Contributions

What-if

Optimization

Data

Management

Predicting and simulating noise€œThanks to LMS Engineering and the optimization process they used...

Documents

Transcript of Predicting and simulating noise€œThanks to LMS Engineering and the optimization process they used...