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RotasPro Gear Test and Noise Analysis. Torsional Analysis of Single Gears. dBV. 80. Mix. 70. Antrieb. 40 Nm. 10-40 Nm. 60. GM. Ghost Orders. 50. 2 *GM. 40. 50. 60. 70. 80. 90. 100. 110. 120. 130. Ord. MTE/Torsional Acceleration Measurement. - PowerPoint PPT Presentation
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Torsional Analysis of Single Gears
RotasPro Gear Test and Noise Analysis
MTE/Torsional Acceleration Measurement
n
M
3000
0
0
50 60 70 80 90 100 110 120 130 Ord
40
50
60
70
80
dBV
Mix
Antrieb
GM
2 *GM
GhostOrders
Test Sequence is steady speed or ramp
Mechanical Layout of Test MachineRotas NVH Analysis
TorsionalAccelerometer
40 Nm 10-40 Nm
Tested Gear
t
t
15-20 s
Revolution Synchronous Transmission Analysis
Input Shaft Interm. Shaft Output Shaft
The transmission noise is the sum of the noise originating from the individual mechanical components.
For the gear noise components, the individual sources can be isolated by the transmission ratio.
Synchronousorder analysis:The signals are acquired synchronousto the inner shafts.AcousticalStroboscope
Input Shaft
Interm. Shaft
Output Shaft
Torsional Accelerometer
gez.:J. Lorenz
Rotierender SensorAbmaßeAluminium/Kunsstoff
ZEICHN.NR.
041220-0MASSTAB 1:1 2004-12-20 BLATT 1 von 1
D IS C OMMATERIAL:
Tel=0551/548330
Fax=0551/5483343
Sender
Empfänger
Lagergehäuse
20
,00
Ø70,00
Ø22,00
Øyxx
32
,00
Sensor
11
0,0
0
125,00
35,00
25,00
45
,00
90
,00
10,00 10,00
Rotational ensorAccelerometers
LED Sender
Optical Receiver Power TransformerInto Rotator
gez.:J. Lorenz
Rotierender Sensor
Empfänger- GehäuseAluminium
ZEICHN.NR.
050103-6MASSTAB 1:1 2005-01-03 BLATT 1 von 1
D IS C OMMATERIAL:
Tel=0551/548330
Fax=0551/5483343
90,00
35,00
11
0,0
0
90
,00
R 12,00
R 14,00
R 13,00R 16,00
R 2,00
Nut 1x2
Nut 2x2
35
,00
24
,00
2,50
10,0010,00
10
,00
10
,00
4x d=5,1
R 4,00
2x M2,5
30
,00
5,0
0
Deckel 10x34,8x5
R 35,00
Nut 1x2
30
,00
2x Bohrung u. Senkung M2,5
1,002,005,00
20
,00
10
,00
Ansicht von oben
2,5
0
53,00
10,00
3,0
0
3,0
0
18
,50
R 35,00
R 32,50
Torsional Accelerometer
Rotating Sensor
Accelerometers measure the deviation from uniform circular motion
Optical SenderOptical Receiver Power TransformerInto Rotator
Accelerometers
Test gear
Master Gear
Torsional Accelerometer
Single Flank Gear Tester Linnenbrink
Results from Crank/Cam Gear pairs
Type: Cm-500 #0, Pz3
05-04-2005 11:09HA 01R
0.0 0.0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 Rev
V.V
-0.3
-0.2.-0.2
-0.1.-0.1
0.0. 0.0
0.1. 0.1
0.2. 0.2
Crank
0.0 0.0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 Rev
V.V
-0.3
-0.2.-0.2
-0.1.-0.1
0.0. 0.0
0.1. 0.1
0.2. 0.2
Cam_Shaft
Type: Cm-500 #0, Pz3
05-04-2005 11:08HA 01R
0.0 0.0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 Rev
V.V
-0.3
-0.2.-0.2
-0.1.-0.1
0.0. 0.0
0.1. 0.1
0.2. 0.2
Crank
0.0 0.0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 Rev
V.V
-0.3
-0.2.-0.2
-0.1.-0.1
0.0. 0.0
0.1. 0.1
0.2. 0.2
Cam_Shaft
Good Gear Set
Crank Gear
Cam Gear
Cm-500 #35-CRK-DH1156, Pz3
05-04-2005 09:54HA 01R
0.0 0.0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 Rev
V.V
-0.24
-0.16.-0.16
-0.08.-0.08
0.00. 0.00
0.08. 0.08
0.16. 0.16
Crank
0.0 0.0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 Rev
V.V
-0.24
-0.16.-0.16
-0.08.-0.08
0.00. 0.00
0.08. 0.08
0.16. 0.16
Cam_Shaft
Eccentricity onCam Gear
Nick on Cam Gear
Graphs show one revolution of the crank and the cam gear when run as pairs on the single flank gear tester. The faults can be easily detected.
Comparing DIN 3960 composite inspection
Fi’ tangential composite deviationLong wave component
Fi’Fi’
fk’ tooth to tooth deviationshort wave component
fk’ fk’
Good Gear Set Eccentricity onCam Gear
Graphs show one revolution of the cam gear when run as pairs on the single flank gear tester. The good and the bad gear set show less variation with this method. Fi’ is even smaller for the bad gear
50 60 70 80 90 100 110 120 130 Ord
40
50
60
70
80
dBV
Mix
Antrieb
Revolution synchronous averaging gives periodic (cyclic) signals. This corresponds to the cyclic nature of the gear sets.
These signals can be transformed into the spectral domain without any time domain leakage windows.
This allows for high spectral resolution. Eccentricities can be easily distinguished from the gear mesh orders. The noise components can be attributed to their origins.
Blue: Conventional order spectrum with Kaiser Bessel Window
Green: Revolution synchronous order spectrum without window function
Synchronous Averaging III
GM 2 *GM
Ecc.. GhostOrders
Results from Single Flank Gear Tester
und Prüftechn ikIndustriel le Meß-
Crank No 30-40
05.04.05 10:19
0 20 40 60 80 100 120 Ord 10
15
20
25
30
35
40
45
50
55
60
65
dBV
Spectra / Pz1 / SK1 / SpecReport
0 40 80 120 160 200 240 Ord 10
15
20
25
30
35
40
45
50
55
60
65
dBV
Spectra / Pz1 / SK2 / SpecReport
0 20 40 60 80 100 120 Ord 10
15
20
25
30
35
40
45
50
55
60
65
dBV
Spectra / Pz2 / SK1 / SpecReport
0 40 80 120 160 200 240 Ord 10
15
20
25
30
35
40
45
50
55
60
65
dBV
Spectra / Pz2 / SK2 / SpecReport
Drive Coast
Crank
Cam
H1 H2
H3
Various filed units shown as stray bands. The gear mesh energies are clearly seen.
Measurement Statistics and Bench Comparison
Over 300 individual measurement results can be evaluated.
The comparison of test benches makes it easy to administer large production facilities.
Order spectra of production units can be displayed in Campbell or in 3-D graphs. Cuts in the order or in the unit direction show order amplitude versus units or the spectrum of one unit. The pictures show the order spectra of 300 production units. A ghost order of 118 is present in the first 40 units tested.
Spectral Statistics
