Application of the improved NOFRFs weighted contribution rate based on KL divergence to rotor rub-impact

Liang, Haiying; Lü, Huanhuan; Feng, Kunpeng; Liu, Yang; Li, Jintao; Lingwei, Meng

doi:10.1007/s11071-021-06502-3

Cited by 24 publications

(16 citation statements)

References 26 publications

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“…In Equation (20), Rn h (n)(ρ) represents the nth-order WNOFRFs of the healthy rotor system and Rn t (n)(ρ) represents the nth-order WNOFRFs of the target rotor system.…”

Section: Improved Wnofrfs Fault Diagnosis Methodsmentioning

confidence: 99%

“…Next, IW1-IW4 were further obtained according to Equation (20). The curves of IW1-IW4 under different crack depths are presented in Figure 5.…”

Section: Improved Wnofrfs For the Cracked Rotor Systemmentioning

confidence: 99%

“…NOFRFs are a significant extension of the FRF theory for linear systems to nonlinear situations. It reveals the rationale of nonlinear phenomena well and provides a certain theoretical basis for analyzing nonlinear systems in the frequency domain [20]. One of the most attractive points of the NOFRFs is its one-dimensional nature, which has many advantages, so it is extensively used in engineering practice to solve some difficult problems, such as in the field of structural health monitoring and fault diagnosis [21].…”

Section: Introductionmentioning

confidence: 99%

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The Improved WNOFRFs Feature Extraction Method and Its Application to Quantitative Diagnosis for Cracked Rotor Systems

Liang

Zhao

Chen

et al. 2022

Sensors

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During its operation, a rotor system can be exposed to multiple faults, such as rub-impact, misalignment, cracks and unbalancing. When a crack fault occurs on the rotor shaft, the vibration response signals contain some nonlinear components that are considerably tougher to be extracted through some linear diagnosis methods. By combining the Nonlinear Output Frequency Response Functions weighted contribution rate (WNOFRFs) and Kullback–Leibler (KL) divergence, a novel fault diagnosis method of improved WNOFRFs is proposed. In this method, an index, improved optimal WNOFRFs (IOW), is defined to represent the nonlinearity of the faulty rotor system. This method has been tested through the finite element model of a cracked rotor system and then verified experimentally at the shaft crack detection test bench. The results from the simulation and experiment verified that the proposed method is applicable and effective for cracked rotor systems. The IOW indicator shows high sensitivity to crack faults and can comprehensively represent the nonlinear properties of the system. It can also quantitatively detect the crack fault, and the relationship between the values of IOW and the relative depth of the crack is approximately positively proportional. The proposed method can precisely and quantitatively diagnose crack faults in a rotor system.

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“…In Equation (20), Rn h (n)(ρ) represents the nth-order WNOFRFs of the healthy rotor system and Rn t (n)(ρ) represents the nth-order WNOFRFs of the target rotor system.…”

Section: Improved Wnofrfs Fault Diagnosis Methodsmentioning

confidence: 99%

“…Next, IW1-IW4 were further obtained according to Equation (20). The curves of IW1-IW4 under different crack depths are presented in Figure 5.…”

Section: Improved Wnofrfs For the Cracked Rotor Systemmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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The Improved WNOFRFs Feature Extraction Method and Its Application to Quantitative Diagnosis for Cracked Rotor Systems

Liang

Zhao

Chen

et al. 2022

Sensors

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“…In intermittent cutting, the tool constantly impact on the workpiece. Liang et al 5–7 proposed an improved rotor rub-impact model to predict this effect. McFeron and Chao 8 studied the ordinary circumferential milling process and predicted the average cutter-chip interface temperature through the analytical method.…”

Section: Introductionmentioning

confidence: 99%

Effect of temperature on milling stability of thin-walled parts

Liu

Cui

Chen

et al. 2022

Proceedings of the Institution of Mechanical Engineers, Part B:

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Milling, as a common machining method, is widely used in rough machining and final finishing of various materials. In this paper, according to the milling temperature produced in the milling process, the formula of heat distribution coefficient for workpiece milling is established. By means of Deform-3D finite element software to carry out orthogonal cutting simulation of workpiece, the influence of different machining parameters on milling heat distribution coefficient is studied, the optimal machining parameters are determined, and the milling temperature experiment is carried out to verify the simulation temperature. The experimental results show that the simulation temperature is very close to the experimental workpiece temperature, and the error is very small, which verifies the accuracy of the method. At the same time, the influence of different initial temperature of workpiece on the milling force and stability is also studied. The results show that proper heating of the workpiece can effectively improve the milling stability of the thin-walled parts.

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“…In the process of milling, the interplay between the workpiece and the tool will lead to vibration, which will make the milling system unstable and even damage the machine tool in serious cases. 18,19 Therefore, the analysis of milling stability is of great importance to avoid chatter and improve machining efficiency and precision.…”

Section: Introductionmentioning

confidence: 99%

Research on the stability analysis of milling of thin-walled parts based on the dynamic characteristics

Liu

Zhao

Cui

et al. 2022

The Journal of Strain Analysis for Engineering Design

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Chatter in thin-walled parts is easy to occur in the process of machining, so the analysis of the stability of thin-walled parts has always been a research hotspot. In this paper, considering the influence of cutter eccentricity on milling force first, the coefficients of milling force were able to be identified by combining the milling force model with genetic algorithm. The results show that this method can obtain the milling force coefficients only by one experiment, and the accuracy is higher. Then the tool point Frequency Response Function (FRF) for a given combination can be calculated by using the Receptance coupling substructure analysis (RCSA) method that uses Timoshenko beam theory. Finally, the milling system can be divided into three types by aspect ratio. That is, when aspect ratio is less than 0.03, the system is considered to be a rigid tool-flexible workpiece system, but aspect ratio is between 0.03 and 0.2, the system is considered to be a flexible tool-flexible system, then aspect ratio is greater than 0.2, the system is considered to be a flexible cutter-rigid workpiece system.

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Application of the improved NOFRFs weighted contribution rate based on KL divergence to rotor rub-impact

Cited by 24 publications

References 26 publications

The Improved WNOFRFs Feature Extraction Method and Its Application to Quantitative Diagnosis for Cracked Rotor Systems

The Improved WNOFRFs Feature Extraction Method and Its Application to Quantitative Diagnosis for Cracked Rotor Systems

Effect of temperature on milling stability of thin-walled parts

Research on the stability analysis of milling of thin-walled parts based on the dynamic characteristics

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