Condition Monitoring of Blade in Turbomachinery: A Review

Abdelrhman, Ahmed M.; Hee, Lim Meng; Leong, M. Salman; Al-Obaidi, Salah M. Ali

doi:10.1155/2014/210717

Cited by 39 publications

(23 citation statements)

References 70 publications

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“…The system presented in the paper is intended to use for monitoring the stress of blade in an industrial steam turbine. The methods of structural health monitoring cover contactless tip-timing techniques using blade-tip vibrometers based on capacitive [13], magneto-resistive [14] or optical sensors [15], as well as contact techniques using fibre grating sensors [16] or mostly used strain gauges [17]. The latter method enables to monitor blade fatigue failures by studying the characteristic of flow-induced resonant vibration.…”

Section: Applications For Wireless and High-temperature Monitoringmentioning

confidence: 99%

Wirelessly Powered High-Temperature Strain Measuring Probe Based on Piezoresistive Nanocrystalline Diamond Layers

Bouřa¹,

Kulha²,

Hušák³

2016

Metrology and Measurement Systems

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A high-temperature piezo-resistive nano-crystalline diamond strain sensor and wireless powering are presented in this paper. High-temperature sensors and electronic devices are required in harsh environments where the use of conventional electronic circuits is impractical or impossible. Piezo-resistive sensors based on nano-crystalline diamond layers were successfully designed, fabricated and tested. The fabricated sensors are able to operate at temperatures of up to 250°C with a reasonable sensitivity. The basic principles and applicability of wireless powering using the near magnetic field are also presented. The system is intended mainly for circuits demanding energy consumption, such as resistive sensors or devices that consist of discrete components. The paper is focused on the practical aspect and implementation of the wireless powering. The presented equations enable to fit the frequency to the optimal range and to maximize the energy and voltage transfer with respect to the coils' properties, expected load and given geometry. The developed system uses both high-temperature active devices based on CMOS-SOI technology and strain sensors which can be wirelessly powered from a distance of up to several centimetres with the power consumption reaching hundreds of milliwatts at 200°C. The theoretical calculations are based on the general circuit theory and were performed in the software package Maple. The results were simulated in the Spice software and verified on a real sample of the measuring probe.

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Section: Applications For Wireless and High-temperature Monitoringmentioning

confidence: 99%

Wirelessly Powered High-Temperature Strain Measuring Probe Based on Piezoresistive Nanocrystalline Diamond Layers

Bouřa¹,

Kulha²,

Hušák³

2016

Metrology and Measurement Systems

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“…The intension was to detect the faults at the early stage before the catastrophic failure take place. An extensive review on this subject can be found in ref [1][2][3]. Blade deformation such as blade twisting, creep, erosion, and corrosion are common faults that occurred in turbomachinery.…”

Section: Introductionmentioning

confidence: 99%

Adapted Wavelet Transform for Twisted Blade Diagnosis in Multi Stage Rotor

et al. 2019

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This paper studies the diagnosis of twisted blade in a multi stages rotor system using adapted wavelet transform and casing vibration. The common detection method (FFT) is effective only if sever blade faults occurred while the minor faults usually remain undetected. Wavelet analysis as alternative technique is still unable to fulfill the fault detection and diagnosis accurately due to its inadequate time-frequency resolution. In this paper, wavelet is adapted and its time-frequency is improved. Experimental study was undertaken to simulate multi stages rotor system. Results showed that the adapted wavelet analysis is effective in twisted blade diagnosis compared to the conventional one.

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“…Several methods of rotor blades diagnosis have been developed and tested, such as eddy current [1], ultrasonic [2,3], thermographic [4,5], radiographic [4,6], and vibration methods [7][8][9][10]. A comprehensive literature review of various blade faults detection methods has been presented by Abdelrhman et al [11].…”

Section: Introductionmentioning

confidence: 99%

Rotor Blades Diagnosis Method Based on Differences in Phase Shifts

Grądzki

Lindstedt

Kulesza

et al. 2018

Shock and Vibration

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In this work, an innovative diagnosis method of rotor blades is presented. A measurement signal of blade tip displacement is divided into two observation zones, in which two peaks of an additional template signal are introduced. Cross-correlation and power spectral density functions of the measurement and template signals in these two distinct zones are calculated. Next, the phase shift between the two cross-correlation functions is obtained by calculating the ratio of the two power spectral density functions. The changes in parameters of an analytical description of this phase shift are used to determine a distinct and easy-to-analyze image of the technical condition of the tested blade. A graphical portrait indicating the technical condition of all blades in the annulus is developed. Although not directly measured, environmental signals (e.g., external disturbances and sensor’s noise) affecting the diagnostic process are included in the method. It is demonstrated that, by using the proposed signal processing technique, a negative influence of these disturbances is eliminated and the reliability of the machine technical condition indications is improved. The approach is demonstrated using experimental results of turbine engine blade displacements. High effectiveness of the method and measurement equipment has been confirmed in a wide range of analyzed tip-timing results obtained in different periods of the measurement process.

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Condition Monitoring of Blade in Turbomachinery: A Review

Cited by 39 publications

References 70 publications

Wirelessly Powered High-Temperature Strain Measuring Probe Based on Piezoresistive Nanocrystalline Diamond Layers

Wirelessly Powered High-Temperature Strain Measuring Probe Based on Piezoresistive Nanocrystalline Diamond Layers

Adapted Wavelet Transform for Twisted Blade Diagnosis in Multi Stage Rotor

Rotor Blades Diagnosis Method Based on Differences in Phase Shifts

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