FEAD dynamics optimization with GT-suite - Gamma ... suite simulation objectives: – Understanding...
Transcript of FEAD dynamics optimization with GT-suite - Gamma ... suite simulation objectives: – Understanding...
© 2014 AGCO Corporation
FEAD dynamics optimization with
GT-suite
GT user conference
17/05/2017
M. TOUSSAINT
0
© 2014 AGCO Corporation
Agenda
Intro – work objectives 1
Results analysis 3
Model building & correlating 2
Solutions evaluation 4
1
Conclusions 5
© 2014 AGCO Corporation
1- intro/ perimeter of study
2
FEAD = Front End Auxiliary Drive
Belt system driving:
– Alternator(s) ≈7 kW
– Engine cooling Fan ≈ 30 kW
– Air compressor ≈5 kW
– A/C compressor ≈7 kW
Power capacity up to 50 kW
Lifetime requirement >1200h
© 2014 AGCO Corporation
FEAD characterization on engine bench:
– @Low RPM:
• High dynamic tension amplitude
• Resonating behavior
Reduced belt lifetime
GT suite simulation objectives:
– Understanding of phenomena & dynamics
– Potential solutions finding
– Solution modeling & impact analysis on system
3
1- intro/objectifs
Critical RPM zone
max
min
© 2014 AGCO Corporation
Agenda
Intro – work objectives 1
Results analysis 3
Model building & correlating 2
Solutions evaluation 4
4
Conclusions 5
© 2014 AGCO Corporation 5
2a- GT-Suite model map
Belt/pulley Friction
Accessory belt
© 2014 AGCO Corporation
Correlation check parameter: dynamic tension
Correlation OK « predictive » analysis possible
6
2b –Model correlation check
Correlation
factor99.527%
Max. dynamic tension curves
Min. dynamic tension curves
© 2014 AGCO Corporation
Agenda
Intro – work objectives 1
Results analysis 3
Model building & correlating 2
Solutions evaluation 4
7
Conclusions 5
© 2014 AGCO Corporation
Study @ 950 RPM
Important engine acyclism + «phase shift» = High dynamic tension amplitude
– Engine (M) RPM + pulley (R) RPM ==> Dynamic tension
– Engine (M) RPM + pulley (R) RPM ==> Dynamic tension
8
3 – Results analysis
Fan pulley
inst. RPM
Inst. Crankshaft RPM
X transmission ratio
Belt dynamic tension
Delta RPM max = 155RPM
R
M
Acyclism is due to alternative movement of engine internal parts Rotating speed is not continuous & regular
Nmoy=950RPM
© 2014 AGCO Corporation
Agenda
Intro – work objectives 1
Results analysis 3
Model building & correlating 2
Solutions evaluation 4
9
Conclusions 5
© 2014 AGCO Corporation
A. Change the inertia of receiving pulley:
– Change sensibility to RPM variation
B. Engine acyclism reduction:
‒ Less RPM variation & amplitude
10
4- Solutions to simulate
© 2014 AGCO Corporation
Increase receiving pulley inertia:
– Less sensible to RPM variations
– Move the 1st mode of the system out of operating range
• 𝐹0 = 2𝜋𝑘
𝐼𝑧𝑧 k cst ==> Izz , F0
11
4/a- Inertia change
Initial result Increased
inertia
Delta RPM max = 155RPM
Delta RPM max = 115RPM (-25%)
Initial result
-20%
Fan pulley inst. RPM
Inst. Crankshaft RPM
x transmission ratio
Increased inertia
© 2014 AGCO Corporation
Lower the FEAD system dynamics:
– Decrease RPM variation frequency & amplitude
– Filtering at the origin: decoupling between crankshaft & Belt system
12
4/b- Engine acyclism reduction
Pulley Hub Pulley grooved outer
ring Crankshaft
Accessory
belt
Damping Element
(decoupling)
Initial result
With damping
-45%
Fan pulley inst. RPM Inst. Crankshaft RPM
x transmission ratio
Delta RPM max ≈ 0RPM (-100%)
© 2014 AGCO Corporation
Agenda
Intro – work objectives 1
Results analysis 3
Model building & correlating 2
Solutions evaluation 4
13
Conclusions 5
© 2014 AGCO Corporation
Problem identification & understanding
Modeling & tuning of potential solutions
Quick & direct impact evaluation with GT-Post
Fast results (≈1h30 / calculation)
High flexibility
Gain:
– EARLY detection of potential reliability risks
– 90h of engine bench testing (estimation)
– 6 to 8 month of work (Proto. parts realization / bench test planning / results analysis / etc.)
14
5- Conclusions
© 2014 AGCO Corporation
FEAD layout choice/comparison
15
Other GT use on FEAD systems
© 2014 AGCO Corporation
Cabin + A/C loop+ pipes + zoning + HVAC blower R. Hoarau
Under hood thermal environment & cooling package (COOL3D) A. Piette
16
Other GT applications at AGCO
© 2014 AGCO Corporation
Thank you for your kind attention!
Any questions?
17