Preprints
https://doi.org/10.5194/wes-2021-89
https://doi.org/10.5194/wes-2021-89

  13 Sep 2021

13 Sep 2021

Review status: this preprint is currently under review for the journal WES.

Very low-frequency IEPE accelerometer calibration and application to a wind energy structure

Clemens Jonscher, Benedikt Hofmeister, Tanja Grießmann, and Raimund Rolfes Clemens Jonscher et al.
  • Leibniz University Hannover / ForWind, Institute of Structural Analysis, Appelstraße 9A, 30167 Hannover, Germany

Abstract. In this work, we present an experimental setup for very low-frequency calibration measurements of low-noise Integrated Electronics Piezo Electric (IEPE) accelerometers and a customised signal conditioner design for using IEPE sensor down to 0.05Hz. AC-response IEPE accelerometer and signal conditioners have amplitude and phase deviations at low frequencies. As the standard calibration procedure in the low-frequency range is technically challenging, IEPE accelerometers with standard signal conditioners are usually used in frequency ranges above 1 Hz. Vibrations on structures with low eigenfrequencies like wind turbines are thus often monitored using DC-coupled micro-electro-mechanical systems (MEMS) capacitive accelerometers. This sensor type suffers from higher noise levels compared to IEPE sensors. To apply IEPE sensors instead of MEMS sensors, in this work the calibration of the entire measurement chain of three different IEPE sensors with the customised signal conditioner is performed with a low-frequency centrifuge. The IEPE sensors are modelled using IIR filters to apply the calibration to time-domain measurement data of a wind turbine support structure. This procedure enables an amplitude and phase-accurate vibration analysis with IEPE sensors in the low-frequency range down to 0.05 Hz.

Clemens Jonscher et al.

Status: open (until 25 Oct 2021)

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Clemens Jonscher et al.

Clemens Jonscher et al.

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Short summary
This work presents a method to use low noise IEPE Sensors in the low frequency range down to 0.05 Hz. In order to achieve phase and amplitude accuracy with this type of sensor in the low frequency range, a new calibration procedure for this frequency range was developed. The calibration enables the use of the low-noise IEPE sensors for large structures, such as wind turbines. The calibrated sensors can be used for wind turbine monitoring, such as fatigue monitoring.