engleski

Compensation for encoder geometry in time interval torsional vibration measurement, simulation and experiment

The time interval torsional vibration measurement technique normally uses high-speed timers to detect the passage times. When used in low cost application together with gear or zebra tape encoder and with lower sampling frequencies, technique can posses problems regarding non-uniform encoder segments geometry. Such a problem is usually manifested as high-level order content in frequency spectrum. To prevent mentioned problem an in-situ segment compensation method is developed that creates a time reference array representative of actual angular segments geometry. To test the compensation method capability a simulation of torsional vibration as well as actual measurement of torsional vibration on a laboratory test rig are presented. The measurements were performed with a non-contact eddy current sensor and toothed wheel together with National Instruments PCI card at the sampling frequency of 10 kHz. The test results show good capabilities in high level order reduction at near constant running speed.

Torsional vibration; Compensation for encoder geometry; Time interval vibration measurement

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