Comparison of the Calibration of a Heavy Multi-Component Vibration Transducer on Different Exciter Systems (Calibration of Heavy Triax-Transducer)

Christian Hof, Michael Kobusch

Abstract

The performance specifications of a shaker may be strongly affected by the load which it is driving. When using a shaker for calibration purposes, the mass and mass distribution of the device under test as well as its mounting configuration may deteriorate seriously the purity of the motion of the shaker armature along the desired axis. In this paper the authors present an attempt to reduce the magnitude of parasitic movements by an improved mounting configuration. Although the resulting motion is significantly improved, transverse, bending and rocking acceleration could not be diminished to less than 10 % as recommended by the ISO standard. In spite of this unsatisfactory large resulting parasitic motion, a reasonable calibration of a device under test is nevertheless possible when selecting carefully the axis of the reference laser vibrometer. We were able to validate this approach by a comparison with a calibration carried out on an alternative vibration exciter of inherently better quality (but considerable higher cost).

Keywords

secondary calibration, vibration transducer, shaker, rocking motion

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IMEKO-TC22-2007-107u.pdf

DOI

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IMEKO TC

TC22 - Vibration Measurement

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