TY - JOUR
T1 - Uncertainty analysis of an optoelectronic strain measurement system for flywheel rotors
AU - Rath, Matthias Franz
AU - Schweighofer, Bernhard
AU - Wegleiter, Hannes
N1 - Funding Information:
Funding: This research was conducted within the project FlyGrid, funded by the Austrian Research Promotion Agency (FFG) within the Electric Mobility Flagship Projects, 9th call, grant number 865447. Open Access Funding by Graz University of Technology.
Publisher Copyright:
© 2021 by the authors. Licensee MDPI, Basel, Switzerland.
PY - 2021/12/1
Y1 - 2021/12/1
N2 - The strain in a fast spinning carbon fiber flywheel rotor is of great interest for condition monitoring, as well as for studying long-term aging effects in the carbon fiber matrix. Optoelectronic strain measurement is a contactless measurement principle where a special reflective pattern is applied to the rotor which is scanned by a stationary optical setup. It does not require any active electronic components on the rotor and is suited for operation in a vacuum. In this paper, the influences of the key parts comprising the optoelectronic strain measurement are analyzed. The influence of each part on the measurement result including the uncertainty is modeled. The total uncertainty, as well as each part’s contribution is calculated. This provides a valuable assessment of requirements for component selection, as well as tolerances of mechanical parts and processes to reach a final target measurement uncertainty or to estimate the uncertainty of a given setup. We have shown that the edge quality of the special reflective pattern has the strongest influence, and how to improve it. Considering all influences, it is possible to measure strain with an uncertainty of less than 1% at a rotation speed of 500 Hz.
AB - The strain in a fast spinning carbon fiber flywheel rotor is of great interest for condition monitoring, as well as for studying long-term aging effects in the carbon fiber matrix. Optoelectronic strain measurement is a contactless measurement principle where a special reflective pattern is applied to the rotor which is scanned by a stationary optical setup. It does not require any active electronic components on the rotor and is suited for operation in a vacuum. In this paper, the influences of the key parts comprising the optoelectronic strain measurement are analyzed. The influence of each part on the measurement result including the uncertainty is modeled. The total uncertainty, as well as each part’s contribution is calculated. This provides a valuable assessment of requirements for component selection, as well as tolerances of mechanical parts and processes to reach a final target measurement uncertainty or to estimate the uncertainty of a given setup. We have shown that the edge quality of the special reflective pattern has the strongest influence, and how to improve it. Considering all influences, it is possible to measure strain with an uncertainty of less than 1% at a rotation speed of 500 Hz.
KW - CFRP
KW - Flywheel
KW - Strain measurement
UR - http://www.scopus.com/inward/record.url?scp=85121112564&partnerID=8YFLogxK
U2 - 10.3390/s21248393
DO - 10.3390/s21248393
M3 - Article
AN - SCOPUS:85121112564
SN - 1424-8220
VL - 21
JO - Sensors
JF - Sensors
IS - 24
M1 - 8393
ER -