nvh assessment and optimization in evs and hevsmyoros.com/oros_evhev_webinar.pdf · nvh assessment...

NVH assessment and

optimization in EVs and HEVs

Guillaume CousinProduct Manager, OROS

OROS Webinar

| 2NVH assessment and optimization in EVs and HEVs

About your presenter

Guillaume Cousin

Guillaume Cousin is Product Manager at OROS for the

EV/HV NVH Solutions. OROS provides Noise and

Vibration testing systems and services to the Automotive

industry covering NVH applications such as Sound Power,

Sound Quality, as well as Modal and Transfer Path

Analysis. Guillaume has globally more than 20 years’

experience in Noise and Vibration applications.


Questions & Answers

Please write your questions

in the Q&A area

We will take time to answer

at the end of this webinar

?

CORENTIN LECOQ

Corentin joined the customer care

department of OROS in 2014.

Since 2016, he has held the position of

application engineer and has been

responsible for supporting users on

advanced projects, sales and validating

OROS solutions.


Webinar Recorded !

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REPLAY THIS WEBINAR


Contents

> OROS Introduction

> NVH New challenges

> Different noise problems to be tackled

> Electromagnetic noise and tools

> Sound design challenges

> Transfer from sources to response

> Testing solutions


Made for Your Demanding World

Industrial SectorsAutomotive

Aerospace

Energy and Process

Marine

Precision Machining and Process

ApplicationsNoise

Rotating

NVH

Structural Dynamics

Quality Process and Control

Product Life CycleR&D

Acceptance

Diagnostics


OROS – Noise and Vibration

Testing and Analysis Solutions

Full Software suiteComprehensive

Application oriented

Rotating

Structural Dynamics

Data Acquisition and Signal Processing

Acoustics

State-of-the-art

InstrumentsFrom 2 to 32 channels

Distributed up to 1000+

DataCare®

Flexible

Made for any testing environment

ServicesCustomer Support

Consulting & Coaching

Customization & Integration


OROS Services, enhance your efficiency

Customer SupportMaintenance centers

Training: initial, advanced, expert

Webinars

Premium Contracts

Maintenance and Calibration

Upgrades and Updates

Everywhere close to you

Consulting & Coaching Assistance in your measurement

Expertise in diagnostics

Customization and integrationAutomatic testing & reporting

Customized interface

Go/NoGo

Integration to existing IT environment


- ICEs replaced by Motors

- Parts weight reduction (chassis, engine, drive line)

- Powertrain excitation content changes (Gearbox)

- New components (Inverter, Battery charging etc…)

- Chassis adaptation required to receive the new

powertrains (motor, gearbox etc…)

From Combustion (ICE) to Electric (EV/HEV)


From Combustion (ICE) to Electric (EV/HEV)

- From a broadband spectrum (appreciated)

sound to a more tonal and annoying noise.

- Reduction of the ICE masking effect

(Aerodynamic, Accessories motors, Tires)

High

speed

ENGINE

Accessories, Tire

Engine, Tire

, Aero

Engine

Motor, Tire, Aero

Low

speed

NVH Consequences:

MOTOR

- New structural excitation frequencies, new modal behavior, new resonances, new responses

- Modifications of the connection points (need for TPA analysis)


Where to solve the challenges ?

SOURCE

RESPONSE


Electrical powertrain sources

Mechanical

Sources:- Ball passing

frequencies

- Gear mesh

frequencies

- Tire road noise

Aerodynamic

Sources:

- Fan blades passing

frequencies

- Wind noise

MotorSlot/pole passing

frequencies

InverterPWM switching

frequencies

Electromagnetic

Sources

Slotting

Noise

Switching

Noise


Electromagnetic excitations

1 pair of

poles

2 pair of

poles

3 pairs of

poles

5 pairs of

poles

Electromagnetic forces are rotating forces: ( with the same or opposite direction

as the rotor): they are defined by their frequency and their distribution

eShapes

eFrequencies


Resonance occurs when

• eFrequencies (magnetic forces frequency)

• eShape

match with

• Natural frequency

• Stator Mode Shape

+ =

Magnetic excitation of

wavenumber 2 at fnat

Modal shape (2,0)

at fnat

How electromagnetic noise is generated?


From surface vibration to electromagnetic forces


Global objectives

> Be able to determine experimentally

eFrequencies & eShapes responsible for

Noise and Vibrations

> Design optimization and mitigation

(skewing, current injection, notches, pole

shaping) interacting with simulation tools


10k PWM

Switching

frequency

H48

H24

H72

H96

Aero +

Mechanical

Slotting

frequencies

Electromagnetic Noise: eFrequencies


Motors configurations

ASYNC

(Induction / IM)

SYNC (SM)

AC- Wound Rotor (WRSM)

- Permanent Magnet SM (IPMSM,SPMSM)

- Synchronous Reluctance Machines (SyncRM)

- Switched Reluctance Machines (SRM)

- Squirrel Cage Induction Machines (SCIM)

- Doubly Fed Induction machines (DFIM)

- Wound Rotor (Slip ring wound rotor)

Stator

Slots

Stator

yoke

Coil

Poles

Air Gap

FOR THAT ONE NEEDS TO TAKE INTO ACCOUNT THE GEOMETRY OF THE MOTOR

INNER / OUTER ROTORS


eFrequencies Editor

H10


• It is therefore important to identify:

• Magnetic force wavenumbers r

• Frequency f

• As well as to identify e-Shapes electromagnetic forces shapes

• The global e-Shape can be seen as a sum of the single r e-shapes (as seen below)

How electromagnetic noise is generated?

…


Determine the

contributing

eShapes?

Using Spatiograms to track contributing eShapes

Acquire the vibrations

around the stator

Calculate the

Spatiograms

Each spatiogram is

calculated based on the

whole set of

accelerometers


Spatio r < 0 (opposite rotating

direction as the rotor) Spatio r > 0 (same rotating

direction as the rotor)

ResponseResponse


1 eShape = 1 Spatio = 1 wavenumber (r)


1- Powertrain setup: - eMotor

- Converter characteristics

2- eNVH tools to efficiently:- Acquire the relevant Noise and Vibration data

- Identify the eFrequencies related to magnetic excitations

- Separate the magnetic excitations from the structural response

- Identify the eShape involved in noise generation

OROS EV/HV module

Ref

r = -1

r = 3 r = -3

r = 2

r = 0 r = 1

r = -2

r = 4

Developed in Cooperation with EOMYS,

specialist in Electromagnetic Noise Engineering


OROS EV/HV module

Seamless integrated within the core

acquisition and analysis platform

A dedicated module

eMachine eFrequencies eShapes

Ref

r = -1

r = 3 r = -3

r = 2

r = 0 r = 1

r = -2

r = 4


Demo


1. Determine the harmonic to

be reduced (Hn)

2. Calculate the Spatiograms

for each wavenumber and

find the Spatiogram (r=0 in

the example) that shows a

high response at the

harmonic to be reduced

(Hn)

3. Check with eMarkers

4. Optimize the design of the

motor


1. Hn to be reduced

2. Impact of r = 0 to be reduced

r = 0r = -1r = -2

r = 3r = 2r = 1

r = -3r = -4


ODS and Modal Analysis

> ODS :

Operating

deflection

shape (stator

ODS)

> Modal Analysis:

SIMO, MIMO,

OMA

- Resonance frequencies

- Resonance damping

- Stator yoke deflection


Sound Design

As discussed during the introduction:

- Reduction of the ICE masking effect (Aerodynamic, Accessories motors,

Tires).

- a more tonal and annoying NOISE with a higher frequency content.

SOUND DESIGN based on

Psychoacoustics Indicators &

Filtered Playback


Relevant psychoacoustics indicators for electric motors

- Strong tonal content of pole/slot effect:

Tone to noise ratio Prominence ratio

- PWM effects: Roughness

Determine objective psychoacoustic metrics in order to match the

acoustic perception obtained through the human ear


Objective : Reduce noise at the TARGET

SOURCE

TARGET


S1 S2 S3 S4Structure

Target

dB

58

45S1

S2

72

Synth 71

S3

S4

45

45

S

S

Target

Subsystems definition: STRUCTURE CONTRIBUTIONS


P2P3

P4

P6

TargetTarget

dB

64

56

41

34P4

P3

P1

P2

72

Synth 71

P 1

P 2 P 7

P 8

P5P1

Subsystems definition: PANELS CONTRIBUTIONS


P1

P2P3

P4

P5

P6

Target

P 1

P 2 P 7

P 8

Airborne and Structure borne contributions

64

A

S

STRUCTURE to PANEL

CONTRIBUTION

S

A

Structure borneAirborne

Target

dB

64

56

41

34P4

P3

P1

P2

72

Synth 71

P1P5


Electric PowertrainElectric motor design

Electric markers

Spatiogram

Sound design of e-motors

ODS

Accessories & ComponentsFiltered playback

Pyschoacoustics evaluation

Sound Power

ChassisLight structure modal analysis

Transfer path analysis

1

Battery charging noiseNoise frequency signature

PanelsTransfer path analysis

Panel contributions at target

Sources ranking

Aerodynamic sourcesAcoustic holography to locate

aerodynamic sources

EV/HV Testing solutions: from sources to reponse

2

3

4

6

5

1

2

3

4

5

6


InstrumentationAcquisition focused on your needs

SoftwareE-NVH measurements & analysis

ServicesAcquisition focused on your needs

OROS e-NVH Solutions


Questions

& Answers


Upcoming Webinars

> June – Acoustic comfort optimization based on an innovative TPA

method (Transfer Path Analysis)

> July – Turbomachinery Vibration analysis

> August – FFT Basics

> September – NVGate V12 Tips and Tricks

Check out our webinar page www.oros.com/webinars for up to date

topics and links to register.

http://www.oros.com/webinars


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nvh assessment and optimization in evs and hevsmyoros.com/oros_evhev_webinar.pdf · nvh assessment...

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