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OR2: A Software Portfolio for NVH Optimization of Gearboxes
Giorgio [email protected] Department – University of Ferrara, ItalyScientific Director in MechLav - Advanced Mechanics Lab – Ferrara Technopole
A Software Portfolio for NVH optimization of gearboxes
Parametric FE model of gearboxes
Parametric LP model of gearboxes
BE model of gearboxes
Sound Quality Analysis of gearboxes
Gear and Shaft vibration in operating conditionVariable forces on bearings and casing
Natural frequency of casingCasing vibration in operating condition
Acoustic comfort metrics
Acoustic radiation
Parametric LP model of gearboxes> rotating components (gears and shafts)
• Low number of DOFs
• LP non‐linear model
• Inertia/stiffness/damping
• Variable meshing stiffness
• Profile errors• Backlash• Bearing
stiffness
Estimation of variable forces on bearing and casing
Parametric FE model of gearboxes > casingMetodology for FE analysis of gearboxes. Example on parallel gearbox
and worm gearbox
Parametric CAD model 3D FE model
Validated FE model
Experimental validation
Mesh Dimension:10 mm5 mm2,5 mm
1,5 mm (Err% < 5%)1,125 mm
Parametric FE model of gearboxes – Modelling
Parametric FE model of gearboxes – Modelling
Parametric FE model of gearboxes – Validation
Validation based on experimental modal analysis
Parametric FE model of gearboxes – Validation
8000.000.00 500.00 1000.00 1500.00 2000.00 2500.00 3000.00 3500.00 4000.00 4500.00 5000.00 5500.00 6000.00 6500.00 7000.00 7500.00Hz
1000.00
0.01e-3
0.10e-3
1.00e-3
0.01
0.10
1.00
10.00
100.00
0.04e-3
0.30e-3
3.00e-3
0.03
0.30
3.00
30.00
300.00
Log
g/N
180.00
-180.00
Phas
e°
250.00 750.00 1250.00 1750.00 2250.00 2750.00 3250.00 3750.00 4250.00 4750.00 5250.00 5750.00 6250.00 6750.00 7250.00 7750.00
3971.92 4902.711709.13 4357.072126.38
FRF 61109000b:45:-Z/61109000b:49:+Z
FRF 61109000b:45:-Z/61109000b:49:+Z
Parametric FE model of gearboxes – Validation
Validation based on MAC on entire gearboxes
Natural mode shape
BE model of gearboxes BEM indirect
OA:73.8 dBOA: 74.4 dB
3000 rpmPoint B*Validated BE model:
Guidelines for acoustic radiation reduction in gearboxes
Sound Quality Analysis of gearboxes
Results of BE model or experimental data Matlab/Octave
NVH Metrics: LoudnessSharpnessRoughnessImpulsivenessModulation indexSound quality of
gearboxes by using numerical or experimental data
0 14s
Rea
lac
um
0 14s
Rea
las
per
Sharpness
Roughness
Conclusions: A Software Portfolio for NVH Optimization of Gearboxes
Parametric FE model of gearboxes
Parametric LP model of gearboxes
BE model of gearboxes
Sound Quality Analysis of gearboxes
Gear and Shaft vibration in operating conditionVariable forces on bearings and casing
Casing vibration in operating condition
Acoustic comfort metrics
Acoustic radiation
Conclusions
• Software portfolio for NVH optimization of gearboxes:• FE modelling• LP modelling• BE modelling• Sound quality analysis
• All the tools have been experimentally assessed
• The methodology can be applied to every gearboxes
Thanks for your kind attention
Giorgio Dalpiaz
Engineering Department – University of Ferrara, Italy
Scientific Director in MechLav - Advanced Mechanics Lab – Ferrara Technopolewww.unife.it/tecnopolo/[email protected]: +39 0532 974883Mobile: +39 328 8606250
