Calculating A Tachometer Signal From Onboard A Smart Vibration Sensor

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Published Sep 24, 2018
Eric Bechhoefer David He

Abstract

Because of the bandwidth limitation of the engine controller, all helicopter gearboxes change speed over time. This change in speed necessitates the resampling of the data, based on a tachometer signal, to facilitate shaft, gear and bearing analysis of the rotating equipment. Without resampling, the quality of vibration analysis is degraded, and many mechanical faults would be missed. Further, interfacing with existing tachometer can be both expensive, and in some cases change certification requirements. The ability for a smart sensor to acquire vibration data, extract the shaft speed from the vibration data, and then process the data allows vibration based fault detection capability at a lower cost, weight and reduced installation complexity than previously possible. Reducing cost, weight and installation complexity will expand the business case for condition monitoring, improving safety and reliability in industrial and transportation systems. This paper demonstrates a twostep process to recover a tachometer signal from vibration data that is of higher quality than raw tachometer data. Statistics are generated from known fault cases to demonstrate the effectiveness.

How to Cite

Bechhoefer, E., & He, D. (2018). Calculating A Tachometer Signal From Onboard A Smart Vibration Sensor. Annual Conference of the PHM Society, 10(1). https://doi.org/10.36001/phmconf.2018.v10i1.338
Abstract 286 | PDF Downloads 658

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Keywords

Tachometer signal, Smart sensor, Vibration

Section
Technical Papers