NOISE RADIATIONNOISE RADIATIONdue to resonance oscillations

Gisela Quintenz &Dr.Thomas Schneider

International CVT ConferenceSeptember 2004

G r o u p

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TABLE OF CONTENTSTABLE OF CONTENTS

OPTIMISATION

OPTIMISATIONDYNAMIC

BEHAVIORDYNAMIC

BEHAVIOR

SIMULATION

PROCESS

SIMULATION

PROCESS

TEAM

PLAY

TEAM

PLAY

3

Incitation: bearing accelerations

1

2

4

Sound pressure [dB]

FE-Model

1

2

3

4

3

OVERVIEWOVERVIEWSIMULATION

PROCESS

4

SPL-CURVESPL-CURVE

30

35

40

45

50

55

60

65

70

75

0 500 1000 1500 2000 2500 3000 3500

frequency [Hz]

pre

ssu

re [

dB

]

1300

Hz

1600

Hz

2150

Hz

600

Hz

Operational condition “3rd gear“

840

Hz

210

Hz

300

Hz

1940

Hz

2260

Hz

DYNAMIC

BEHAVIOR

5

VERTICAL BENDINGVERTICAL BENDING214 Hz

DYNAMIC

BEHAVIOR

6

600 Hz

DYNAMIC

BEHAVIOR

BEARING OSCILLATIONBEARING OSCILLATION

7

600 Hz

DYNAMIC

BEHAVIOR

BEARING OSCILLATIONBEARING OSCILLATION

8

DYNAMIC

BEHAVIOR

BEARING OSCILLATION WITH

ASSEMBLY INTERACTION

BEARING OSCILLATION WITH

ASSEMBLY INTERACTION

9

BEARING BRACKETBEARING BRACKET1300 Hz

DYNAMIC

BEHAVIOR

10

FLANGE OSCILLATIONFLANGE OSCILLATION1600 Hz

DYNAMIC

BEHAVIOR

11

PULLEY TORSIONPULLEY TORSION1940 / 2150 Hz

DYNAMIC

BEHAVIOR

12

SHAFT BENDINGSHAFT BENDING2260 Hz

DYNAMIC

BEHAVIOR

13

MOVABLE SHEAVEMOVABLE SHEAVE3290 Hz

DYNAMIC

BEHAVIOR

14

FIXED SHEAVEFIXED SHEAVE4150 Hz

DYNAMIC

BEHAVIOR

15

40

45

50

55

60

65

70

75

1000 1500 2000 2500 3000

frequency [Hz]

pres

sure

[dB

]

____ Basis

____ Damping Layer

OPTIMISATION DAMPING LAYERDAMPING LAYER(broadband effect)

16

SPL -5 dB

OPTIMISATION FLANGE DESIGNFLANGE DESIGN1300 Hz

17

OPTIMISATION FLANGE DESIGNFLANGE DESIGN

SPL -6 dB

1600 Hz

18

OPTIMISATION MOVABLE SHEAVEMOVABLE SHEAVE3290 Hz

19

OPTIMISATION FIXED SHEAVEFIXED SHEAVE4150 Hz

20

CAE & TEST:VALIDATION RESULTS

CAE & TEST:VALIDATION RESULTS

average all Micros

Frequency [Hz]

Pre

ssu

re [

dB

]

____ calculation results

____ test rig measurements

5 dB

TEAM

PLAY

TEAM

PLAY

TESTCAE

DESIGN

MEMBERS OF THE OPTIMISATION TEAM

MEMBERS OF THE OPTIMISATION TEAM

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Thank you for your attention!Thank you for your attention!

G r o u p