Torque Converter Dynamic Characterization Using Torque Transmissibility Frequency Response Functions: Locked Clutch Operation

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Authors Abstract
Content
A unique torque converter test setup was used to measure the torque transmissibility frequency response function of four torque converter clutch dampers using a stepped, multi-sine-tone, excitation technique. The four torque converter clutch dampers were modeled using a lumped parameter technique, and the damper parameters of stiffness, damping, and friction were estimated using a manual, iterative parameter estimation process. The final damper parameters were selected such that the natural frequency and damping ratio of the simulated torque transmissibility frequency response functions were within 10% and 20% error, respectively, of the experimental modal parameters. This target was achieved for all but one of the tested dampers. The damper models include stiffness nonlinearities, and a speed-dependent friction torque due to centrifugal loading of the damper springs. Recommendations include further testing to separate the coulomb friction mechanism from the viscous damping mechanism, testing with the torque converter operating in open mode, and tests on a series of customized dampers with centrifugal pendulum absorber hardware.
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DOI
https://doi.org/10.4271/15-17-02-0010
Pages
16
Citation
Jurmu, L., Robinette, D., Blough, J., and Reynolds, C., "Torque Converter Dynamic Characterization Using Torque Transmissibility Frequency Response Functions: Locked Clutch Operation,"https://doi.org/10.4271/15-17-02-0010.
Additional Details
Publisher
Published
Jan 10
Product Code
15-17-02-0010
Content Type
Journal Article
Language
English