Non-contact crack detection of high-speed blades based on principal component analysis and Euclidian angles using optical-fiber sensors

Chen, Zhongsheng; Yang, Yongmin; Xie, Yonghui; Guo, Boling; Hu, Zheng

doi:10.1016/j.sna.2013.06.018

Cited by 50 publications

(32 citation statements)

References 12 publications

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“…From the engineering implementation point of view, the electronic realization to acquire feasible data for fault diagnosis in mechanical systems is a key stage design along with an appropriate excitation system command (see, for instance, [Haridas and Pawar, 2018;Chen et al, 2013b]). Our proposed platform involves these important parts by incorporating a vibration sensor based on an LC-tank oscillator (hence, electronic engineering students may find it attractive as an application of it), and by programming an appropriate reference trajectory used by the propelled system's actuator via the DC-Motor.…”

Section: Discussionmentioning

confidence: 99%

An experimental platform for statistical fault diagnosis in propelled mechanical systems: an academic exercise

Acho

Caballero

2019

CAP

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Statistical data analysis for fault diagnosis in mechanical systems is a fundamental tool, for instance, in applied mechanical engineering. In order to capture a feasible data set, a well designed electronic instrumentation and excitation system signal stages are mandatory. Hence, one objective of this paper is to develop a lowcost vibration sensor based on an inductive LC-tank oscillator (a resonant inductive-capacitive electronic circuit carefully designed to produce an harmonic electrical signal), and then to tune an effective excitation system signal to our experimental platform. This platform uses a propelled drone motor mounted on a beam structure to emulate a propelled rotating machine. Essentially, two data set were acquired. One for the healthy behaviour of the developed system, and the other for a programmed faulty scenario. This defective case was realized by introducing a small mechanical fault in one blade extreme of the mechanical propelled system. To note, this faulty scenario is almost impossible to de-duce by just seen the raw data. The other objective of this paper is to analyze the obtained data sets by utilizing a statistical data analysis tool. Then, by employing box-plot diagrams, the healthy and faulty cases become evidenced. Finally, and due to we are proposing a low-cost academic experimental platform for fault diagnosis based on data analysis, our platform's toll was around 120 euros. Hence, this platform results applicable to teach data analysis from dynamical systems.

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Section: Discussionmentioning

confidence: 99%

An experimental platform for statistical fault diagnosis in propelled mechanical systems: an academic exercise

Acho

Caballero

2019

CAP

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“…According to equation (16), g(τ) is sampled uniformly at the time points τ � nT. en, we can use the proposed method in [13] to reconstruct g(τ). e details are summarized as follows.…”

Section: Uniform Btt Sensor Configurationmentioning

confidence: 99%

“…Let f 0 be the targeted central frequency which can be close to natural frequencies, then we can only focus on a real band-pass signal g(τ) with the center frequency f 0 and bandwidth B 0 in "true" blade vibration signals. Secondly, the reconstructed band-pass signal g(τ) can be represented as [13]…”

Section: Uniform Btt Sensor Configurationmentioning

confidence: 99%

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Undersampled Blade Tip‐Timing Vibration Reconstruction under Rotating Speed Fluctuation: Uniform and Nonuniform Sensor Configurations

Chen

Zhan

2019

Shock and Vibration

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Blade tip-timing (BTT) is a promising method of online monitoring rotating blade vibrations. Since BTT-based vibration signals are typically undersampled, how to reconstruct characteristic vibrations from BTT signals is a big challenge. Existing reconstruction methods are mainly based on the assumption of constant rotation speeds. However, rotating speed fluctuation is inevitable in many engineering applications. In this case, the BTT sampling process should be nonuniform, which will cause existing reconstruction methods to be unavailable. In order to solve this problem, this paper proposes a new reconstruction method based on nonlinear time transformation (NTT). Firstly, the effects of rotating speed fluctuation on BTT vibration reconstruction are analyzed. Next, the NTT of BTT sampling times under rotating speed fluctuation is presented. Then, two NTT-based reconstruction algorithms are derived for uniform and nonuniform BTT sensor configurations, respectively. Also several evaluation metrics of BTT vibration reconstruction under rotating speed fluctuation are defined. Finally, numerical simulations are done to verify the proposed algorithms. The results testify that the proposed NTT-based reconstruction method can reduce effectively the influence of rotating speed fluctuation and decrease the reconstruction error. In addition, rotating speed fluctuation has more bad effects on the reconstruction method under nonuniform sensor configuration than under uniform sensor configuration. For nonuniform BTT signal reconstruction under rotating speed fluctuation, more attentions should be paid on selecting proper angles between BTT sensors. In summary, the proposed method will benefit for detecting early blade damages by reducing frequency aliasing.

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“…On the other hand, the occurrence of cracks can be reflected by changes in vibration characteristics. us, online monitoring of rotated blades through their vibration can be useful for cracks identification and significant for operational safety of aeroengines [1][2][3]. Effects of cracks on vibration characteristics of blades can be reflected by natural frequency, mode shape, vibration response, and so on.…”

Section: Introductionmentioning

confidence: 99%

Extraction of Features due to Breathing Crack from Vibration Response of Rotated Blades considering Tenon Connection and Shroud Contact

Yang

et al. 2019

Shock and Vibration

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Cracks are common failures of aeroengine rotated blades. Online monitoring of rotated blades through their vibration to identify cracks early in various working conditions is significant for operational safety. Breathing crack is a practical form of early cracks and results in nonlinear vibration response. Tenon connection and shroud contact are common structures in aeroengine rotated blades, which can also lead blades to vibrate nonlinearly and seriously interfere online identification of early cracks. us, it is important to extract vibration features due to breathing crack considering these two structures. Firstly, a blade with tenon and shroud is simplified and a lumped parameter model of the bladed disk is built. en, dry friction and coupling force on a blade are analyzed and dynamics equations of the lumped parameter model are established. Next, the stiffness of the blade trunk with a breathing crack is analyzed. Finally, the vibration response of blade trunks with the occurrence of breathing crack is analyzed in time and frequency domains by numerical simulation. Effective features due to breathing crack for online identification are extracted. 2x components of spectrums can be the criterion to judge whether breathing crack occurs. Besides, by comparing the changes in vibration amplitudes with 1x component peaks of spectrums, the cracked blade trunk can be distinguished. ese findings can provide important theoretical guidance for online identification of early cracks in aeroengine rotated blades.

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Non-contact crack detection of high-speed blades based on principal component analysis and Euclidian angles using optical-fiber sensors

Cited by 50 publications

References 12 publications

An experimental platform for statistical fault diagnosis in propelled mechanical systems: an academic exercise

An experimental platform for statistical fault diagnosis in propelled mechanical systems: an academic exercise

Undersampled Blade Tip‐Timing Vibration Reconstruction under Rotating Speed Fluctuation: Uniform and Nonuniform Sensor Configurations

Extraction of Features due to Breathing Crack from Vibration Response of Rotated Blades considering Tenon Connection and Shroud Contact

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