Rotational speed measurement using a low-cost imaging device and image processing algorithms

Abstract

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Review and comparison of tacholess instantaneous speed estimation methods on experimental vibration data

“…Equation 16does not take into account the possibility that a part of the spectrum for a certain harmonic H i can exceed the Nyquist frequency. In this case the pdf is made uniform above f max /H i : (18) with ξ i now:…”

“…Following the Industry 4.0 trend, there is an increasing focus on cost efficiency also in this research field. Wang et al [17,18] show that visionbased rotation speed estimation is feasible using a low-cost imaging device. Their methodology is based on tracking the degree of similarity, quantified by a two-dimensional correlation, between consecutive images.…”

Event-Based Angular Speed Measurement and Movement Monitoring

“…The contact measurement system requires to be mounted on the rotating object. It often causes wear on the system over time, and there is an influence on rotating parts due to the additional mass [ 14 , 15 ]. There are many types of non-contact measurement systems, such as optical encoders [ 16 ], electrical [ 17 ], magnetic induction [ 18 , 19 ], and vibration signal analysis [ 20 ].…”

Instantaneous Rotational Speed Measurement Using Image Correlation and Periodicity Determination Algorithms

“…With rapid advances in imaging sensors and image processing algorithms in recent years, imaging based techniques provide a promising alternative to rotational speed measurement [13][14][15][16][17][18][19][20][21]. The imaging technique is potentially suitable for applications in a hostile environment because of its sensing principle.…”

“…There are very few reports on this topic in the literature. Preliminary studies were first reported at the 2018 IEEE International Instrumentation and Measurement Technology Conference [21]. However, this original system only aims at mean rotational speed measurement under steady states.…”