Affiliation:
1. Michigan Technological University, USA
2. General Motors Company, USA
Abstract
<div>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.</div>
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