Transient high-frequency elasto-acoustic response of a vehicular drivetrain to sudden throttle demand

Abstract This paper presents an experimental investigation of the high-frequency structural response of vehicular powertrain systems when subjected to sudden surge in output torque demand as in throttle tip-in from coast to drive condition. The lightly damped drivetrain system has many lash zones represented by low stiffness components and thin shell elements with large modal densities. The high-frequency noise and structural dynamic modes excited under impact conditions through low lash rate zones are of short transitory nature but a major concern to vehicle drivers and other road users alike. An investigation of the root cause of these transitory events requires state-of-the art signal processing techniques at reasonably high sampling rates. This paper presents the results of an investigation into the driveline clonk problem and establishes the relationship between this phenomenon and the low-frequency shuffle of the vehicle.

[1]  H. Akaike.  Statistical predictor identification , 1970 .

[2]  W. E. Tobler,et al.  Dynamic Behavior of a Torque Converter with Centrifugal Bypass Clutch , 1985 .

[3]  H. Akaike.  Power spectrum estimation through autoregressive model fitting , 1969 .

[4]  George Cybenko.  Round-off error propagation in Durbin's, Levinson's, and Trench's algorithms , 1979, ICASSP.

[5]  Kevin Forsberg.  Influence of Boundary Conditions on the Modal Characteristics of Thin Cylindrical Shells , 1964 .

[6]  Homer Rahnejat,et al.  The influence of the interface coefficient of friction upon the propensity to judder in automotive clutches , 1999 .

[7]  Emanuel Parzen,et al.  STATISTICAL SPECTRAL ANALYSIS (SINGLE CHANNEL CASE) IN 1968. , 1968 .

[8]  N. Andersen.  On the calculation of filter coefficients for maximum entropy spectral analysis , 1974 .

[9]  Gwilym M. Jenkins,et al.  Time series analysis, forecasting and control , 1972 .

[10]  Homer Rahnejat,et al.  COMBINING DESIGN OF EXPERIMENTS AND MODELLING TECHNIQUES TO RESOLVE COMPLEX CLUTCH PEDAL NOISE AND VIBRATION PROBLEMS , 1998 .

[11]  Charles W. Therrien,et al.  Discrete Random Signals and Statistical Signal Processing , 1992 .

[12]  W. E. Tobler,et al.  Interactive Computer Simulation of Drivetrain Dynamics , 1985 .

[13]  Dietmar Dipl.-Ing. Heidingsfeld,et al.  The Hydraulic Torsion Damper-A New Concept for Vibration Damping in Powertrains , 1989 .

[14]  Kevin Forsberg.  Influence of Boundary Conditions on the Modal Characteristics of Thin Cylindrical Shells , 1963 .

[15]  D. G. Watts,et al.  Spectral analysis and its applications , 1968 .

[16]  S. Haykin,et al.  Comments on "The complex form of the maximum entropy method for spectral estimation" , 1977 .

[17]  Robert A. Krenz.  Vehicle Response to Throttle Tip-In/Tip-Out , 1985 .

[18]  Jun Ma,et al.  Wavelet decomposition of vibrations for detection of bearing-localized defects , 1997 .

[19]  Stéphane Mallat,et al.  A Theory for Multiresolution Signal Decomposition: The Wavelet Representation , 1989, IEEE Trans. Pattern Anal. Mach. Intell..

[20]  Homer Rahnejat,et al.  Clonk: An onomatopoeic response in torsional impact of automotive drivelines , 1999 .

[21]  H. Akaike.  Autoregressive model fitting for control , 1971 .

[22]  E. Parzen.  Mathematical Considerations in the Estimation of Spectra , 1961 .

[23]  J W Biermann,et al.  Investigation of the clonk phenomenon in vehicle transmissions—measurement, modelling and simulation , 1999 .

[24]  T. Barnard,et al.  The maximum entropy spectrum and the Burg technique. Technical report no. 1: Advanced signal processing , 1975 .

[25]  H. Akaike.  A new look at the statistical model identification , 1974 .

[26]  H. Akaike.  Fitting autoregressive models for prediction , 1969 .

[27]  R N Arnold,et al.  Flexural vibrations of the walls of thin cylindrical shells having freely supported ends , 1949, Proceedings of the Royal Society of London. Series A. Mathematical and Physical Sciences.

[28]  D. Newland.  Wavelet Analysis of Vibration: Part 1—Theory , 1994 .

[29]  P. Fougere.  A solution to the problem of spontaneous line splitting in maximum entropy power spectrum analysis , 1977 .

[30]  Truong Q. Nguyen,et al.  Wavelets and filter banks , 1996 .

[31]  S.M. Kay,et al.  Spectrum analysis—A modern perspective , 1981, Proceedings of the IEEE.

[32]  James Durbin,et al.  The fitting of time series models , 1960 .

[33]  P. Fougere,et al.  Spontaneous line splitting in maximum entropy power spectrum analysis , 1976 .

[34]  Ingrid Daubechies,et al.  The wavelet transform, time-frequency localization and signal analysis , 1990, IEEE Trans. Inf. Theory.

[35]  J. Shanks.  RECURSION FILTERS FOR DIGITAL PROCESSING , 1967 .