Synchronous Online Monitoring of Rotational Speed and Temperature for Rotating Parts in High Temperature Environment

Chen Li,Yingping Hong,Qiyun Feng,Jijun Xiong,Mangu Jia,Pengyu Jia,Yanan Xue,Haoyue Lu

doi:10.1109/access.2021.3094579

Chen Li, Yingping Hong + Show 6 more

Open Access

https://doi.org/10.1109/access.2021.3094579

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Abstract

Rotational speed and temperature measurements of an engine blade surface play a vital role in the performance detection of an engine. We proposed a wireless passive LC sensor based on thick-film integration technology to integrate the sensor in situ on the surface of the rotating part, which can be used to monitor the rotational speed and temperature of the rotating part. The reflection signal generated by the impedance mismatch is output in the form of voltage through the detection circuit such that the synchronous online measurement of rotational speed and temperature is realized by analyzing the time slot of adjacent troughs and the amplitude of the output voltage. In addition, we used laser drilling, screen printing, high-temperature sintering, and other technologies to integrate the sensor in situ on the surface of the ceramic turntable, which is lightweight. Finally, the test was conducted by setting up a rotational speed-high-temperature composite experimental platform, and the results showed that the sensor can work normally in the range of 25-830°C, and the rotational speed measurement range was 50-400rpm. The consistency of the rotational speed measurement was suitable, the maximum error was less than 1%, and the work was stable within 180 min.

Highlights

As one of the key components of airplanes and automotives, engines contain numerous rotating parts, including blades, bearing brackets, and shafts, which work in harsh environments, such as high rotational speeds and high temperatures [1,2,3,4,5]
A rotational speed sensor based on the contact measurement principle is installed on the surface of the rotating component directly such that the signal transmission electrical lead runs with the rotating component, causing problems, such as inaccurate test results and damage to the test device
In 2012, Li et al [9] from Wuhan University developed a rotational speed sensor using the fiber Bragg grating as a sensitive component, which measured the rotational speed by converting the speed into grating strain

Summary

INTRODUCTION

As one of the key components of airplanes and automotives, engines contain numerous rotating parts, including blades, bearing brackets, and shafts, which work in harsh environments, such as high rotational speeds and high temperatures [1,2,3,4,5]. In 2012, Li et al [9] from Wuhan University developed a rotational speed sensor using the fiber Bragg grating as a sensitive component, which measured the rotational speed by converting the speed into grating strain This type of optical sensor has strict requirements for the optical path transmission of a dust and barrier-free environment. In this study, we proposed a wireless passive sensor to monitor rotational speed and temperature synchronously, allowing in situ integration of post-membrane technology as the fabrication process and electromagnetic induction principle as the transmission method to extract characteristic signals wirelessly. The sensor prepared in this study is lightweight, along with the wireless signal extraction method, which makes it promising for in situ synchronization online monitoring of rotational speed and temperature in harsh environments, such as turbine blades and bearing cages of aero-engines

MEASUREMENT PRINCIPLE

AND DISCUSSION

ROTATIONAL SPEED MEASUREMENT UNDER A ROOM TEMPERATURE ENVIRONMENT

ROTATIONAL SPEED MEASUREMENT UNDER A HIGH-TEMPERATURE ENVIRONMENT

Findings

CONCLUSION