Abstract
When monitoring the vibration of heavy rotating machinery, one often has problems with cables of vibration transducers, as those cables are usually long, heavy and prone to damage. This paper is focused on the development of a wireless vibration transducer, based on the MEMS accelerometer, which is free of those problems. Owing to the schematics proposed, developed sensor’s power consumption is low, at that analog filtering of vibration acceleration signal is provided. In the paper, spectral analysis based method of frequency response correction is also proposed. That method can be used for measurement of the vibration RMS and power spectra, while using an MCU with low computational power for data processing. The results of the tests conducted show that the transducer developed is well-behaved and that its precision is comparable to one of industrial piezoelectric transducers. So, the transducer developed can be used instead of the industrial transducers mentioned; at that, moving of the machine condition detection process from the high–level system to the transducer level allows one to decrease network traffic and simplify monitoring system as a whole.
Highlights
When measuring vibration of the heavy machinery, connection of transducers is one of the critical issues
As cable capacity has a significant influence on the piezoaccelerometer voltage sensitivity coefficient and on the frequency response slope at high frequencies, cable length is typically not higher than 1–3 m, which is insufficient for measurement of vibration of heavy machinery
As one can see from the test results, the transducer has an acceptable precision and is suitable for use in vibration monitoring systems, in particular, in systems for rotating machinery vibration monitoring
Summary
When measuring vibration of the heavy machinery (generators, turbines), connection of transducers is one of the critical issues. Accelerometers with ICP output are free of limitations mentioned, but when measuring vibration of the heavy machinery, one has to use shielded cable tens of meters long. Using such a cable is unhandy because of its length and mass; except that, personnel often works with the cable carelessly, and that results in breakdown of both cable and connectors of cable and equipment. MEMS have a number of advantages compared to industrial piezoaccelerometers: smaller size and mass, lower power consumption and tens of times less cost. Development of MEMS-based vibration transducer would make it possible to decrease the cost, mass and power consumption of rotating machinery monitoring systems. Development of MEMS-based vibration transducer is an actual task
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