Effects of Crack on Vibration Characteristics of Mistuned Rotated Blades

Xu, Hailong; Chen, Zhongsheng; Yang, Yongmin; Tao, Lan; Chen, Xuefeng

doi:10.1155/2017/1785759

Cited by 18 publications

(9 citation statements)

References 22 publications

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“…us, airflow forces can be considered to be gradient forces. Similar to [29], airflow force f i is simulated to a harmonic and cosine function which is utilized as follows:…”

Section: Modeling Of External Airflow Forces and Establishment Of Dynmentioning

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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“…us, airflow forces can be considered to be gradient forces. Similar to [29], airflow force f i is simulated to a harmonic and cosine function which is utilized as follows:…”

Section: Modeling Of External Airflow Forces and Establishment Of Dynmentioning

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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“…Vibration has been shown to detect fracture in other mechanical systems (Ansari, Chauhan, and Khaire. 2017;Xu et al 2017;Ismail, Ibrahim, and Martin 1990), so the expansion of process monitoring in cold forging and the effectiveness of monitoring vibration signal was explored in a previous study by Glaeser et al (2020). It was discovered that vibration could be used to detect process variations resulting from changing parts, i.e.…”

Section: Introductionmentioning

confidence: 99%

Applications of deep learning for fault detection in industrial cold forging

Glaeser

Selvaraj

Lee

et al. 2021

International Journal of Production Research

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The feasibility of using deep learning techniques in industrial cold forging for fault detection was investigated. In this work, vibration data were collected from an industrial setting to detect machine conditions resulting in defective products (faults). After collecting data from several commonly encountered faults, a Convolutional Neural Network classifier detected fault conditions with 99.02% accuracy and further classified each fault with 92.66% accuracy. A decision tree (DT) model was also used in an attempt to detect and classify faults using time domain features. The model was able to detect faults with 92.5% accuracy but was unable to classify them. In addition, DT feature importance analysis was performed to understand how various faults impacted the machine signal for future refinement of the proposed system. The results suggest that the proposed deep learning method has the potential to detect faults in cold forging, but future work is required to validate the method.

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“…However, in their model, the crack is assumed to be open, and the nonlinear effects of crack are neglected. To further analyzing the nonlinear vibration of cracked rotating blades, on the basis of lumped-mass blade model and local flexibility crack model, Xu [30,31] derived a nonlinear model of rotating blades with breathing crack to identify weak crack using vibration power flow analysis and predicted the mistuning behavior of blade-disk system using conventional modal analysis. Since the lumped-mass blade model is simplified to a single-degree-freedom system, the accuracy of their model will be significantly reduced.…”

Section: Introductionmentioning

confidence: 99%

“…For example, the FE-based contact crack model (FECCM) is used to investigate the nonlinear vibration and mistuning behavior of bladedisk system with breathing crack [32]. However, their investigations are mainly focused on the free vibration analysis and mistuning behavior prediction, and the flexibility of shaft is ignored [22,[29][30][31][32].…”

Section: Introductionmentioning

confidence: 99%

Steady-state coupling vibration analysis of shaft–disk–blade system with blade crack

Yang

Mao

et al. 2021

Nonlinear Dyn

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Rotating shaft-disk-blade (RSDB) system is one of the most important parts of turbomachinery, such as aero-engine, gas turbine and power plant. The coupling vibration of RSDB system with blade crack is vital for the blade health monitoring and crack detection of rotating blade. This study aims at addressing the dynamic modeling and steady-state coupling vibration mechanism of RSDB system with blade crack. First and foremost, on the basis of the stress state at crack section, an improved analytical breathing crack model (modified stress-based breathing crack model, MSBCM) for rotating blade is proposed. The validity of the proposed breathing crack model is verified by comparing the results obtained by MSBCM, finite element contact crack model and conventional analytical crack models. The comparative results suggest that MSBCM is of high fidelity and behaves best among the analytical crack models. Subsequently, a comprehensive dynamic model of the coupling vibration for RSDB system with blade crack is formulated on the basis of continuum

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Effects of Crack on Vibration Characteristics of Mistuned Rotated Blades

Cited by 18 publications

References 22 publications

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

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

Applications of deep learning for fault detection in industrial cold forging

Steady-state coupling vibration analysis of shaft–disk–blade system with blade crack

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