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Communication Dans Un Congrès Année : 2014

Detection of rattle noise with optical encoders in run-up conditions

Résumé

This work proposes an original approach to detect rattle noise of automotive gearbox under non-stationary conditions. Rattle noise is produced by vibro impacts between teeth of unloaded gears and principally caused by the engine acyclism. A test bench with a universal joint is used to generate acyclism and to permit the appearance of rattle noise during speed ramp. One optical encoder is placed inside the gearbox to access the instantaneous angular speed of one loose gear and two other encoders are placed at the end of the primary and secondary shafts outside the gearbox. First of all the relative speed of the unloaded meshing gears is observed to directly detect the instants of impact. These results are compared with an original method of detection based on an angle/time cyclostationary approach. The advantage is to keep the angle/time duality to characterize this phenomenon: the cyclic frequency expressed in events per revolution is indeed directly linked to the periodicity of the impacts while their nature is linked to the bandwidth expressed in Hertz.
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Dates et versions

hal-01018905 , version 1 (06-07-2014)

Identifiants

  • HAL Id : hal-01018905 , version 1

Citer

Sophie Baudin, Didier Rémond, Jérôme Antoni, Olivier Sauvage. Detection of rattle noise with optical encoders in run-up conditions. ISMA 2014, Sep 2014, Belgium. pp.254. ⟨hal-01018905⟩
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