Current trends for advanced automotive engines focusing on downsizing, better fuel efficiency, and lower emissions have led to several changes in turbocharger bearing systems design, and technology. Automotive turbochargers are running faster under high engine vibration level. Vibration control is becoming a real critical issue and turbocharger manufacturers are focusing more and more on new and improved balancing technology. This paper deals with turbocharger synchronous vibration control on high speed balancers. In a first step the synchronous rotordynamics behavior is identified. The developed fluid bearing code predicts bearing rotational speed (in case of fully floating design), operating inner and outer bearing film clearances and bearing force coefficients. A rotordynamics code uses this input to predict the synchronous lateral dynamic response of the rotor-bearing system by converging with bearing eccentricity ratio. The rotor-bearing system model is validated by shaft motion test data on high speed balancer (HSB). It shows that only one of the peaks seen on the synchronous G level plot collected in a high speed balancer can be explained by rotordynamics physics. A step-by-step structural dynamics model and analysis validated by experimental frequency response functions provides robust explanations for the other G level peaks. The synchronous vibration response of the system “turbocharger-HSB fixture” is predicted by integrating the predicted rotordynamics rotational bearing loads on the structural dynamics model. Numerous test data show very good correlation with the prediction, which validates the developed analytical model. The “rotordynamics—structural dynamics model” allows deep understanding of turbocharger synchronous vibration control, as well as optimization of the high speed balancer tooling.

References

1.
Nicholas
,
J. C.
,
Whalen
,
J. K.
, and
Franklin
,
S. D.
,
1986
, “
Improving Critical Speed Calculations Using Flexible Bearing Support FRF Compliance Data
,”
15th Turbomachinery Symposium, Texas A&M University
,
College Station, TX
, November 10–13.
2.
Xu
,
J.
, and
Vance
,
J. M.
,
1997
, “
Experimental Determination of Rotor Foundation Parameters for Improved Critical Speed Predictions
”, ASME Paper No. 97-GT-449.
3.
Rouch
,
K. E.
,
McMains
,
T. H.
, and
Stephenson
,
R. W.
,
1989
, “
Modeling of Rotor-Foundation Systems Using Frequency-Response Functions in a Finite Element Approach
,” 1989 ASME Design Technical Conference 12th Biennial Conference on Mechanical Vibration and Noise, Montreal, Canada, September 17–21, pp.
157
166
.
4.
Smart
,
M.
,
Friswell
,
M. I.
,
Lees
,
A. W.
, and
Prells
,
U.
,
1998
, “
Estimating Turbogenerator Foundation Parameters
,”
IMechE J. Mech. Eng. Sci.
,
212
(8), pp.
653
665
.10.1243/0954406981521420
5.
Wang
,
Q.
, and
Maslen
,
E. H.
,
2006
, “
Identification of Frequency-Dependent Parameters in a Flexible Rotor System,
ASME J. Eng. Gas Turbines Power
,
128
(3), pp.
670
676
.10.1115/1.2135814
6.
Cherril
,
A. P.
,
1997
, “
Optimal Transfer Function Estimation From Frequency Response Data
,”
43rd International Instrumentation Symposium
, Orlando, FL, May 4–8, pp.
399
407
.
7.
Cavalca
,
K. L.
,
Cavalcante
,
P. F.
, and
Okabe
,
E. P.
,
2005
, “
An Investigation on the Influence of the Supporting Structure on the Dynamics of the Rotor System
,”
Mech. Syst. Signal Process.
,
19
(1), pp.
157
174
.10.1016/j.ymssp.2004.04.001
8.
Ewins
,
D. J.
,
1984
,
Modal Testing: Theory and Practice
,
Research Studies Press Ltd.
,
Letchworth Hertfordshire, UK
.
9.
Yamaguchi
,
T.
,
Ogawa
,
M.
,
Kasahara
,
T.
, and
Arakawa
,
N.
,
1985
, “
Advanced Measurement Method of Frequency Response Function
,”
3rd International Modal Analysis Conference
,
Orlando, FL
, January 28–31, Vol.
I
, pp.
565
568
.
10.
Nelson
,
H. D.
, and
Meacham
,
W. L.
,
1982
, “
Transient Response of Rotor-Bearing Systems Using Component Mode Synthesis, Part IV: Mathematical Development
,” NASA Lewis Research Center, Cleveland, OH, NASA Grant No. NAG 3-6.
11.
Gjika
,
K.
, and
Groves
,
C.
,
2006
, “
Nonlinear Dynamic Behavior of Rotor-Bearing Systems Involving Two Hydrodynamic Films in Series: Prediction and Test Application to High-Speed Turbochargers
,”
ASME
Paper No. ESDA2006-95792.10.1115/ESDA2006-95792
12.
Davies
,
P.
,
Genin
,
E.
,
Daguin
,
T.
,
Marsal
,
D.
, and
Jeckel
,
D.
,
2010
, “
Down-Speeding & Upgrading a Product Line for US'07 Tier2 Bin5, Eu5 & Eu6
,” 15th Supercharging Conference, Dresden, Germany, September 23–24.
13.
LaRue
,
G.
, Kang, S. G., and Wick, W.,
2006
, “
Turbocharger With Hydrodynamic Foil Bearings
,” U.S. Patent No. 7,108,488 B2.
14.
Childs
,
D.
,
1993
,
Turbomachinery Rotordynamics
,
John Wiley & Sons, Inc.
,
New York
, Chap. 4.
15.
Nelson
,
H. D.
,
1980
, “
A Finite Rotating Shaft Element Using Timoshenko Beam Theory
,”
ASME J. Mech. Design
,
102
(4), pp.
793
803
.10.1115/1.3254824
16.
Nelson
,
H. D.
, and
Meacham
,
H.
,
1981
, “
Transient Analysis of Rotor-Bearing System Using Component Mode Synthesis
,” ASME Paper No. 81-GT-10.
17.
Gjika
,
K.
, and
LaRue
,
G.
,
2002
, “
Dynamic Behaviour of Rotor-Bearing Systems Involving Two Oil Films in Series: Application to High-Speed Turbochargers
,”
Transactions of the 7th International Conference on Turbochargers and Turbocharging, IMechE
,
London, UK
, May 14–15, pp.
101
115
.
18.
Pinkus
,
O.
, and
Sternlicht
,
B.
,
1961
,
Theory of Hydrodynamic Lubrication
,
McGraw-Hill Book Company
,
New York
.
19.
Stone
,
J. M.
, and
Underwood
,
A.
,
1947
, “
Load Carrying Capacity of Journal Bearings
,”
SAE
Technical Paper No. 470203.10.4271/470203
20.
Trippett
,
R. J.
, and
Li
,
D. F.
,
1983
, “
High-Speed Floating-Ring Bearing Test and Analysis
,” American Society of Lubrication Engineers 38th Annual Meeting, Houston, TX, April 24–28, Paper No. ASLE 83-AM-3E-2.
21.
Ramsey
,
K.
,
1983
, “
Experimental Modal Analysis, Structural Modifications and FEM Analysis on a Desktop Computer
,” Sound and Vibration,
17
(2), pp. 19–27.
22.
Gjika
,
K.
, and
Dufour
,
R.
,
1999
, “
Rigid Body and Nonlinear Mount Identification: Application to On-Board Equipment With Hysteresis Suspension
,”
J. Vibr. Control
,
5
(1), pp.
75
94
.10.1177/107754639900500104
23.
Gjika
,
K.
,
Dufour
,
R.
, and
Ferraris
,
G.
,
1996
, “
Transient Response of Structures on Viscoelastic and Elastoplastic Mounts: Prediction and Experiments
,”
J. Sound Vib.
,
193
(
3
), pp.
361
378
.10.1006/jsvi.1996.0575
24.
ANSYS
, version 11.0, 2007, Ansys Inc., Canonsburg, PA.
25.
Gjika
,
K.
,
Dufour
,
R.
,
Swider
,
P.
, and
Thouvenin
,
D.
,
1993
, “
The Dynamics Behavior of a Turbocharger Rotor Involving a Subassembly
,”
DTA/NAFEMS International Conference on Structural Dynamics Modeling: Test, Analysis and Correlation
,
Cranfield, UK
, July 7–9, pp.
217
226
.
26.
Benzley
,
S.
,
Perry
,
E.
,
Merkley
,
K.
,
Clark
,
B.
, and
Sjaardama
,
G.
,
1995
, “
A Comparison of All Hexagonal and All Tetrahedral Finite Element Meshes for Elastic and Elasto-Plastic Analysis
,”
4th International Meshing Roundtable
,
Albuquerque, NM, October 16–17
, pp.
179
191
.
27.
Gjika
,
K.
,
San Andrés
,
L.
, and
LaRue
,
G.
,
2010
, “
Nonlinear Dynamic Behavior of Turbocharger Rotor-Bearing Systems With Hydrodynamic Oil Film and Squeeze Film Damper in Series: Prediction and Experiment
,”
ASME J. Comput. Nonlinear Dyn.
,
5
(4), p.
041006
.10.1115/1.4001817
28.
San Andrés
,
L.
,
Maruyama
,
A.
,
Gjika
,
K.
, and
Xia
,
S.
,
2010
, “
Turbocharger Nonlinear Response With Engine-Induced Excitations: Predictions and Test Data
,”
ASME J. Eng. Gas Turbines Power
,
132
(3), p.
032502
.10.1115/1.3159368
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