Design for NVH (Noise Vibration Harshness)-A Holistic Approach … · 2019. 2. 27. · Abb.:...

Prof. Dr. Peter G. Blaschke

Design for NVH (Noise Vibration

Harshness)-A Holistic Approach

for Design, Simulation and

Verificaton

Prof. Dr. Peter G. Blaschke 2 Design for NVH

Design for NVH

Agenda

1. Introduction

2. NVH Integration in the development process NVH- Why??? What are the goals? Identification of vibration parameters Sensitivity analysis Impact in the Design Identification of specifications

3. Current Projects 4. Summary

http://www.th-wildau.de/im-studium/fachbereiche/inw/inw-studiengaenge/mb/labore/maschinendynamik0/projekte.html

Tour through the lab HAUS 15










Introduction

Why NVH ?

www.beaudaniels-illustration.com

NVH Issues

Noise (NVH)

Vibration

Natural frrequencies


Introduction

Warum NVH ?

DC/Ford/GM Combined Complaints by Problem

Symptom

0

1

2

3

4

5

6

DaimlerChrysler Ford GM

% T

hin

gs

Go

ne

Wro

ng

Pedal Req'd Too Much Effort Pedal Feels Mushy/Soft Not Engh Stopping Power Noisy

Pull Vibrate/Shudder ABS Light Indicated Problem Traction Control Sys Problem

J. D. Power and Associates, New Car Quality Survey data, MY2015, wave 2

O.E.M. 1

No

isy

No

isy

No

isy

O.E.M. 2 O.E.M. 3

Brake System Complaints by Problem

Symptom (combined total, all models of

each O.E.M.)


Introduction

Why NVH ?

How identify the customer the quality of the product?

Isophonic curves of the human hearing

That`s why Noise, Vibration and Harshness is a key problem of

your product


NVH integration of NVH in the development

process

Psychoacoustics im Maschinenbau? Time data and 3rd octave spectrum of similar signals

Similar 3rd octave spectrum

and sound pressure level



process: Target definition

Human Hearing is very sensitive to patterns – tones, varying tones, clicks, rattles, etc.

Why can you raed tihs setnecne,

athlgouh the letetrs are arrganed in the

wonrg odrer?

Diagram does not depict the heard phenomenon.

The Relative Approach – analysis adapted to the signal

processing of human hearing – is matching with the auditory

perception.


Noise HF

Squeal/Quietschen

NF

Squeal/Quietschen Moan/Muhen

Velocity 0-10 km/h 0-10 km/h 0-10 km/h

Pressure 5-30 bar 5-30 bar 0-10 bar

Temperature Low Temp.–300°C Low Temp.-300°C Low Temperature

Frequency 4- 6 kHz 1-4 kHz 50-1000 Hz

Pattern tonal tonal tonal

based on recordings from Continental

Brake Noises and their typical patterns






Noise Chirp/Zwitschern Groan/Knarzen Creak/Knarren

Velocity 0-10 km/h 0-1 km/h standstill

Pressure 5-30 bar 5-10 bar 0-10 bar

Temperature Low Temp.–300°C Low Temperature independent

Frequency 1- 16 kHz 50-500 Hz broadband

Pattern tonal, modulated transient transient

Groan f /Hz

50

100

200

500

1k

2k

10k

t/s0 2 4 6 8 10

cp/cPa0 5 10 20 25

Left

Creak f /Hz

50

100

200

500

1k

2k

10k

t/s0 2 4 6 8 10

cp/cPa0 5 10 20 25

Left

Chirp f /Hz

20

50

100

200

500

1k

2k

10k

t/s0 2 4 6 8 10

cp/cPa0 5 10 15 30 35 40

Lef t

Brake Noises and their typical patterns


Scanning-Laser-Doppler-Vibrometer (SLDV)

• Benefits of the use of Laser vibrometrie – „Virtuell“ Sensors

• No additional cost for additional measurement points

– No mass effect of Sensors – Measured net is compatible

with FE-Net – Automatic Modal analyis

with automatic hammer

Quelle: Polytec GmbH, FAFA 2015; Fachausschuss für Fahrzeug Akustik in der Deutschen Gesellschaft für Akustik(DEGA))


NVH Integration in the

Development process

Measurements are

typically made with the

structure on free-free

conditions.

Source: SAE J2598-2012 Surface Vehicle Recommended Practice


Scanning-Laser-Doppler-Vibrometer (SLDV)


NVH Integration in the

Development process


Slow Motion Video – Double Hit and Single Hit

Double Impact Single Impact



process: Target definition @ Specification

Lots of information can be extracted after a simple modal test

with an impact hammer on brake pads.



process: Target definition @ Specification

Damage detection

Proof of the microstructure (Nodularität,

density, etc.)

Geometrical structure (Dimension)

Connectivity (Verbindungsgüte)

Damping

Hardness


NVH integration of NVH in the development process:

Target definition @ Specification

Design Catalog for NVH

a

R

h

r

Sensitivity parameters

b

D Chart 1: Rotor sensitivity U152 design (D=304mm),

free-free, nodel diameter modes

-200

-100

0

100

200

300

400

500

600

700

800

2 3 4 5 6 7 8 9 10 11 12

ND mode

df/

dx /

[h

z/m

m]

df/da

df/db

df/dR

df/dr

Chart 20: 2nd Pair

9000

9200

9400

9600

9800

10000

10200

10400

10600

10800

11000

300 305 310 315 320 325 330 335 340 345 350

D / [mm]

f /

[Hz]

2 IPM

8 NDM


Geometrical Inspection

• GOM Series of industrial optical 3D scanners provide accurate scans with detailed resolution.

• ATOS delivers three-dimensional measurement data and analysis for sheet metal parts, turbine blades, prototypes, injection moulded parts, castings, and more.

• Can accurately measure from 170*170*170 mm3 to 1000*1000*1000 mm3

Fig: GOM ATOS TRIPLE SCANNER Fig: GOM CORE


Scope of Equipment – 3D Scan

GOM 3D SCANNER

DRONE ROTOR

3D SCAN DATA


Scope of Equipment – Surface Inspection

3D SCAN DATA 3D CAD DATA

Fig :Indicating the variation between the CAD data and the Scan data

+


Scope of Equipment – Surface Inspection

Fig: Plot of the variation along aerofoil section Fig: Plot of the variation along surfaces of the rotor

BIT – Belag Impedance Test 24 Dipl.-Wirtsch.-Ing. Jörg Ritter

Prof. Dr. Peter Blaschke

Current Projects

BIT -ZIM

Belagmaterial-Test

Bremsbelag-Prüfstand

BIT Schwungmassen-prüfstand

Prüfstand / Teststrecke

Forschung 80 T€ 100 T€ 1,6 Mio.€ 3,5 Mio.€ / 100 T€

nur Materialproben

Belag Belag ganze Bremse ganze Bremse + Fahrzeug

Materialparam. Bauteilparam. ohne Druck

Bauteilparam. unter Druck

Systemparam. Systemparam.

Quelle: HORNIG, S., GRÄBNER, N., VON WAGNER, U., 2011, Influence of Dynamic Brake Pad Properties on Automotive Disk Brake Squeal.pdf

https://www.youtube.com/watch?v=ES-KnrgXzcQ

Bosch Besucherbroschüre, Farmington Hills, 2010

http://www.kfz-tech.de/Bilder/Kfz-Technik/Komfort/Geraeusch02.jpg

http://breck.pl/wp-content/uploads/2014/01/28.png

zu komplex zu simpel

BIT – Belag Impedance Test 25 Dipl.-Wirtsch.-Ing. Jörg Ritter

Prof. Dr. Peter Blaschke

Belag Impedance Test – Proof of concept

free-free

compressed

grounded

Piston Influence Pressure Influence


Vibro Acoustics Composite Optimization and End

of line Test

Abb.: Versuchsaufbau der Levitation (links) / Labormuster zur

Schwingungsprüfung (rechts)

Patent: DE 10 2015 106 603.3 angemeldet 04/2015, Blaschke, Schneider, Paeschke

EMA FEA

measurement

matching calculation

modal parameters

FE-model

modal parameters

FE-calculation

comparison

update

Experimental Modal Analysis Finite Element Analysis

Kompetenz Fraunhofer Pyco

Efre-Staff- Förderung 2016-2018 Measurement

Curve fitting

Modal Parameters

Modal Validation

Update


NVH Mixer

Modalanalyse am Mixer


NVH – Window Lift motor


Zusammnefassung

Combination of

Innovative technologies

Computer-Aided Design

Source: Traceparts

Source: own

3D Laser Scanning Doppler

Vibrometry

Source: Polytec

Automatic Modal Testing

Rapid Prototyping

Source: own

Finite-Elements- Analysis

Source: ANSYS

Industrial 3D Digitalisation

Source: Fraunhofer

Psychoacoustics

Source: HEAD acoustics

Contactless Modal Testing

Source: own

Prof. Dr. Peter G. Blaschke

Thanks for your attention

Design for NVH (Noise Vibration Harshness)-A Holistic Approach … · 2019. 2. 27. · Abb.:...

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