HEAD 2018 International Conference on Automotive …nvh.org.cn/PostImage/20181102060138.pdfHEAD acoustics GmbH Methods for sound design and NVH development of environment-friendly

2018汽车NVH控制技术国际研讨会

电动和混动汽车声学设计与NVH开发Methods for Sound Design and NVH Development of

Electric and Hybrid Vehicles

Dipl.-Ing. Daniel Riemann

NVH咨询部门高级项目经理

Senior Project Manager, consult NVH

Methods for sound design and NVH development of environment-friendly vehicles with customer focusHEAD acoustics GmbH 3

Introduction

Sound Design and NVH Development for environment friendly vehicles (EV, HEV):

Interior Noise:• Sound cleaning

• P/T noise

• Wind noise

• Tire noise

• Sound Design /

Enhancement

• P/T noise

• ANC

• ANE

Exterior Noise:• Sound cleaning

• Sound enhancement

• Pedestrian warning

system

DrivabilityRange

(weight) Cost …

Focus on potential customer!

Innovative

methods and tools

are required !


Typical Tasks during NVH Development

Timeline NVH Development:

Benchmarking and

Target Setting

NVH Development

Concept Phase SOPPrototypingDesign phase

TPASimulation PCA ANC/ANE

• Sound Quality Metric

• Target Sound Design

• Define Targets on vehicle and

source/path level

• FEM/BEM

• CFD

• MBS

• Identify root causes

• Estimate potential

• Develop

countermeasures

• Optimize vehicle

trim package

• Active Sound

design


Benchmarking and Target Sound Development

Development of Sound Quality Targets with clear focus on the potential Customer:

What is the expectation of the (potential) customer / driver ?

How do people drive?

When do they like the sound or complain about the sound ?

How often do these situations occur during normal driving ?

What NVH issues are really important?

-> HEAR! will help to

find the answers


HEAR! – Head Empirical Assessment Ride

Procedure for Test Drives

Vehicle evaluation in realistic environment, during real driving.

People comment in their own words what they like and don´t like.

Recording of relevant vehicle and P/T parameters.

Experts and potential customers can be integrated in this process.

Analysis of comments and vehicle information

Identification of relevant conditions

HEAR! evolved from the EVE Method

Positive ConditionsNegative Conditions

Test driver comments are seen

in the driving condition context

Test drive evaluation pinpoints the most

important needs for improvementClustering of comments

reveals important issues!

Analysis of Test Drives: Driving Condition Maps

e.g. electrical power vs speed: “powertrain point of view”

Test drives

Post pro

cessin

g


HEAR!: Benchmark and Target Sound Development

Development of Sound Quality Targets:

Test Drives, Additional Roller Dyno Measurements,

Jury Tests, Targets, Sound Quality Metrics

• Procedure of Test Drives, HEAR! method

(Identification of relevant operating

conditions)

• Comparable acoustic roller dyno

measurements under defined and

reproducible conditions

• Jury Test Evaluation for Sound Quality

Investigations and Target Definition

• Definition of Sound Quality Metrics for

automatic calculation of perceived sound

quality (optional)


HEAR!: Target Development based on Benchmark Tests

For each phenomenon, relevant driving conditions are identified and compared

For all relevant phenomena, target values or target curves are developed based on the vehicle benchmark

The suggested targets are realistic, and in fact reached by at least one of the benchmark vehicles

selection of relevant

measurement condition

performance of

comparable roller-dyno

measurements

identification of suitable

analysis methods

definition of target values

or curves based on the

vehicle benchmark


BTPA: Interior Noise Synthesis in Time Domain

Time domain calculation enables auralization of results

Convolution of measured excitations with corresponding transfer functions leads to realistic Interior noise

synthesis, even for transient noises

No limitation of analyzing only stationary conditions transient, run-ups + coast, tip-ins, etc. possible

Listen to interior noise contributions at each step of the (B)TPA process

Evaluation of transfer path modifications by means of interior noise synthesis

Sum

Path 1

Path 2

Path 3

Path 4

Path 5

Path 6

Path 7

Path 8

Path 9

Interior Noise Contributions

Sound pressure at drivers ear

p

a

p

a

Structure Borne

Noise Sources

Airborne Noise

SourcesTransfer path

Transfer path

Transfer path

Transfer path

Sources Paths

10Methods for sound design and NVH development of environment-friendly vehicles with customer focusHEAD acoustics GmbH

BTPA Structure Borne - HEAD Effective Mount Transfer Consideration

(EMTF)

Matrix-

inversion

Inverted

Inertances

Passive side

Accelerations

෨𝐹1𝐼𝐹𝐷(𝑡)

෨𝐹𝐾𝐼𝐹𝐷(𝑡)

𝑎1𝑃𝑆(𝑡)

𝑎𝑙𝑃𝑆(𝑡)

𝑎𝐿𝑃𝑆(𝑡)

Operational

ForcesInterior Noise

+

Acoustic Transfer

Functions

𝑝𝑖(𝑡)

𝐻1,𝑖𝐴𝑇𝐹(𝑓)

𝐻𝐾,𝑖𝐴𝑇𝐹(𝑓)

𝑎1𝐴𝑆(𝑡)

𝑎𝑘𝐴𝑆(𝑡)

𝐻1𝑀𝑇𝐹(𝑓)

𝐻𝑘𝑀𝑇𝐹(𝑓)

෨𝐹1𝑀𝑇𝐹(𝑡)

෨𝐹𝐾𝑀𝑇𝐹(𝑡)

w/o

rubber

mounts

Rubber

Mounts

Effective Mount

Transfer Functions

+

𝑝𝑖(𝑡)

𝐻1,𝑖𝐴𝑇𝐹(𝑓)

𝐻𝐾,𝑖𝐴𝑇𝐹(𝑓)


BTPA Structure Borne – Integration of CAE into BTPA Process

Simulation model Simulation resultsVehicle / test bench

measurements

Transfer path analysis and

interior noise synthesis

Evaluation of

estimated sound


Example: BTPA Results for Electric Vehicle

7,34

29/30

58

14,6829

7,3410

29

60

Sum Structure borne Airborne

Le

ft e

ar

Original optimized airborne transmission Airborne + drive shafts + mounts

Run up WOT, roller dyno, FFT vs. rpm, airborne and structure borne shares

Estimation of potential for countermeasures (synthesis)

Original Modification

Validation

Validation measurements:

Airborne Isolation


Binaural Panel Contribution Analysis (BPCA)

Which panel has the strongest contribution?

How to improve the vehicle trim package?

n panels

m PU

probes per

panel

vATFResult of TPA: Force [N] Interior noise [SPL]

Black Box

NTF

Sound pressure level in the vehicle compartment is the sum of the sound

contributions of all surfaces enclosing the cabin.


BPCA Procedure and Results, Example: Tire/Road Noise 130-100 kph

+

Pa

ne

l 1 sub panel 1v

sub panel mv

Q

Q

p

RTF

RTF

Pa

ne

l 2 sub panel 1v

sub panel mv

Q

Q

RTF

RTF

Panel n sub panel 1v

sub panel mv

Q

Q

RTF

RTF

iii

n

i

ii

SvQ

RTFQp

20

1

:

:

)/( :

:

:

:

i

i

i

i

v

S

QpRTF

n

Q

p Sound pressure

Source strength of surface i

Number of panels

Reciprocal Transfer Function

Area of surface i

Particle velocity at the surface i

Q

pRear left door

Left B-pillar

1/6th octave bands, max of both ears

Front left door


Case Study: Sound Design for Active Noise Enhancement System (ANE)

Creation of synthetic sounds for electric vehicles

HEAD consult NVH is involved in synthetic sound

design for electric vehicles

Electric Vehicle Interior Sound

• Driver focus

• Emotional feedback for the driver

• Vehicle brand character

Electric Vehicle Exterior Sound

• Pedestrian focus

• Warning attribute

• Vehicle brand character

• Conformance to international regulations

Design of synthetic sounds (interior)

RPM / vehicle speed / load controlled

parametric response

Playback in simulator system (ANE)

HEAR! -> evaluation of customer

acceptance for different synthetic sounds

Case Study:

Vehicle data

(CAN)

Sound Playback

ANE Test System


Case Study: Customer Acceptance of Synthetic Sounds

„unobtrusive“„Modern“1„ICE like sound“ „no additional Sound“

Only Original

Sound

Original Sound

+ synthetic sound

based upon sound of ICE

Original Sound

+ “modern”

synthetic sound

Original Sound

+ unobtrusive

synthetic sound


Driving Condition Maps and Distribution of Customers Comments

Distribution of comments (positive, negative and neutral) for different sound concepts versus acceleration and speed:

„ICE like“ Sound „Modern“ Sound

„unobtrusive“ Sound

45%

26%

29%

3 – „unobtrusive“ Sound

33%

45%

22%

1 – „ICE like“ Sound

32%

42%

26%

4 – no added Sound

17%

44%

39%

2 – „Modern“ Sound

• Positive

• Negative

• Neutral

• Positive

• Negative

• Neutral

• Positive

• Negative

• Neutral

• Positive

• Negative

• Neutral


Summary: Methods for Sound Design and NVH Development

Timeline NVH Development:

Benchmarking and

Target SettingNVH Development

HEAR! BTPA BPCA ANC / ANE

HEAD Methods and Tools:

Concept Phase SOPPrototypingDesign phase

CAE integration

Dipl.-Ing. Daniel Riemann

Senior Project Manager, consult NVH

[email protected]

www.head-acoustics.de © Copyright HEAD acoustics GmbH

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HEAD 2018 International Conference on Automotive …nvh.org.cn/PostImage/20181102060138.pdfHEAD acoustics GmbH Methods for sound design and NVH development of environment-friendly