Determining the Torsional Stiffness for Gearbox Transmission using Methodologies for Evaluation the Measure System and Validate the Theoretical Model

Clodoaldo Borges Chagas; Thiago Caetano Freitas

doi:10.4271/2011-36-0155

The main objective of this study is to measure the torsional stiffness of automotive transmissions. This activity is important to provide data related to the elasticity of the vehicle powertrain and contribute to create a national database for this parameter.

The transmission torsional stiffness value is an input data of the software Dyfasim that is used to predict (estimate) the resonances of the vehicle powertrain. This analysis leads to a better understanding of required design parameter of clutches.

Further, the statistical method Measurement System Evaluation - MSE was applied in the planning and execution of tests. The MSE methodology ensures that the bench is robust for variations common to the usage, such as the influence of the operator, input force and gear ratio. This step has an important hole in the Model Verification and Validation '- MVV, methods, because is possible to quantify the experimental uncertainties and indicate the necessaries modifications to reach a considerable level of acceptability.

The methodologies for MSE and MVV were performed in two different test rigs, in the first setup the torque is applied through a lever arm using standard weights. The second bench is improved by the use of a pulley system which has a load cell to controls the input torque. In both setups strain gages (45°) were fixed in the input and output shafts to serve more details about the behavior of the system and to guarantee that the correct load is applied in the gearbox.

The results show that the second arrangement supplied high level of precision and repeatability. Thus values found during the job will be used to build a library and the parameters will be set in the Dyfasim Software. The following steps should be: measure the resonances during car operation and validate the software results.

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Determining the Torsional Stiffness for Gearbox Transmission using Methodologies for Evaluation the Measure System and Validate the Theoretical Model 2011-36-0155

SAE MOBILUS