Analysis and experimental identification of torsional dynamic characteristics of hydrodynamic torque converter

The subsection linear torsional model of hydrodynamic toque converter was established and further simplified. According to the identification theory, the frequency characteristic was achieved with the Matlab/Ident toolbox. Then parametric model was established by adopting the subsection linearization method, and the damp value was estimated. The curve and function of damp changing with speed ratio was also established by fitting. In order to validate the identification results, the experimental output was compared with the output of the model in which torque was chosen as input signal and speed as output signal in Matlab/Ident toolbox. It was shown that model output is in good agreement with experimental output.