Practical performances of high-speed measurement of gear Transmission Error or torsional vibrations with optical encoders - Laboratoire de Mécanique des Contacts et des Structures Accéder directement au contenu
Article Dans Une Revue Measurement Science and Technology Année : 1998

Practical performances of high-speed measurement of gear Transmission Error or torsional vibrations with optical encoders

Résumé

We evaluated in this paper an improved technique to measure Gear Transmission Error (GTE) at high speed, by using low pulse per revolution optical encoders. The originality of this technique lies on the fact that highly precise, completely digital measurements of torsional vibration or Transmission Error (TE) at high speed are achievable by the use of low price, basic optical components. The length of encoder pulses are estimated with a high frequency timer (100 MHz) : thus, it appears that the theoretical precision of this device only depends on the angular speed of shafts, but not on the number of pulses per revolution of the encoder. In practice, intrinsic encoder accuracy (i.e. grating or electronic signal processing precision) directly affects precision measurements. Alternatively, the number of pulses per revolution of the encoder specifies the resolution. We examined the possibility of calibrating encoders through a specific test rig. The determination of corrective data assigned to each gratings leads to a non significant improvement of the precision measurement. The coherence from one revolution to another does not present any significant deterministic component. The overall precision achieved is less than 0.03 second of arc on each frequency of the power spectral density. This calibration device only gives a good assessment of eccentricity induced by mechanical mounting of optical disks on a shaft, compared with the direct measurement on grating disks. The correlation between the two measurements is less than 3% of the magnitude of the relative eccentricity. Thus, encoder technique seems to be a cheap and easy way to implement Transmission Error measurement on real mechanical systems with high precision and sufficient reliability.
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Dates et versions

hal-00692560 , version 1 (05-11-2018)

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Didier Rémond. Practical performances of high-speed measurement of gear Transmission Error or torsional vibrations with optical encoders. Measurement Science and Technology, 1998, 9 (3), pp.347-353. ⟨10.1088/0957-0233/9/3/006⟩. ⟨hal-00692560⟩
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