Fault Diagnosis of Intershaft Bearings Using Fusion Information Exergy Distance Method

Jun, Tian; Ai, Yanting; Fei, Chengwei; Zhao, Ming; Zhang, Fengling; Wang, Zhi

doi:10.1155/2018/7546128

Cited by 11 publications

(6 citation statements)

References 25 publications

(31 reference statements)

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“…For entropy analysis of the ECG signal, a Matlab code was developed (MATLAB R2017a; MathWorks Inc., Natick, MA, United States, 2014) using the algorithms for calculation of AAPE ( Azami and Escudero, 2016 ) and IEIN ( Zhang et al, 2014 ) based on robust empirical permutation entropy rePEnew ( Unakafova, 2015 ). Analysis of each ECG record provided values of AAPE and IEIN σ ( Tian et al, 2018 ). The first parameter characterizes the (ir)regularity of the ECG signal, whereas the second one describes its development in time.…”

Section: Methodsmentioning

confidence: 99%

TdP Incidence in Methoxamine-Sensitized Rabbit Model Is Reduced With Age but Not Influenced by Hypercholesterolemia

et al. 2021

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Metabolic syndrome is associated with hypercholesterolemia, cardiac remodeling, and increased susceptibility to ventricular arrhythmias. Effects of diet-induced hypercholesterolemia on susceptibility to torsades de pointes arrhythmias (TdP) together with potential indicators of arrhythmic risk were investigated in three experimental groups of Carlsson’s rabbit model: (1) young rabbits (YC, young control, age 12–16 weeks), older rabbits (AC, adult control, age 20–24 weeks), and older age-matched cholesterol-fed rabbits (CH, cholesterol, age 20–24 weeks). TdP was induced by α-adrenergic stimulation by methoxamine and IKr block in 83% of YC rabbits, 18% of AC rabbits, and 21% of CH rabbits. High incidence of TdP was associated with high incidence of single (SEB) and multiple ectopic beats (MEB), but the QTc prolongation and short-term variability (STV) were similar in all three groups. In TdP-susceptible rabbits, STV was significantly higher compared with arrhythmia-free rabbits but not with rabbits with other than TdP arrhythmias (SEB, MEB). Amplitude-aware permutation entropy analysis of baseline ECG could identify arrhythmia-resistant animals with high sensitivity and specificity. The data indicate that the TdP susceptibility in methoxamine-sensitized rabbits is affected by the age of rabbits but probably not by hypercholesterolemia. Entropy analysis could potentially stratify the arrhythmic risk and identify the low-risk individuals.

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Section: Methodsmentioning

confidence: 99%

TdP Incidence in Methoxamine-Sensitized Rabbit Model Is Reduced With Age but Not Influenced by Hypercholesterolemia

et al. 2021

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“…Therefore, the accurate dynamic modeling of rolling-element bearings has attracted more and more attention in the field of the mechanical industry. It can provide theoretical guidance for the development of fault diagnosis techniques of rolling-element bearings [2,3].…”

Section: Introductionmentioning

confidence: 99%

A Study on the Modeling Method of Cage Slip and Its Effects on the Vibration Response of Rolling-Element Bearing

Luo

Chen

et al. 2022

Energies

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Rolling-element bearings play vital roles in the dynamic vibration performance of the whole machinery. Hence, accurate modeling and assessment of the rolling-element bearing are beneficial for the well understanding of the vibration response of rolling-element bearing. However, cage slip is usually ignored in the traditional rolling-element bearing modeling methods, which has a direct influence on the rotating speed and friction force of the rolling elements. To settle the modeling problem of rolling-element bearing with cage slip, in this study, a nonlinear dynamic model with multiple degrees of freedom of the roller bearing is established. The cage slip, the motion of each roller, nonlinear contact, damping, and friction are taken into consideration. With the proposed method, a nonlinear traction model is presented to describe the friction forces induced by cage slip. Furthermore, both the friction force acting on rolling elements and the effects of cage slip on the vibration response are investigated based on the established model. Some comparisons between the proposed modeling method with cage slip and the classical method without cage slip are made. The results show that the friction force applied to the balls increases with the cage slip, friction coefficient, rotational speed, and radial load. A slight cage slip could be beneficial for reducing the vibration energy of rolling-element bearing; however, it will result in more friction loss and impact components.

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“…Once rolling bearing fault occurs, it directly affects the working state and operation efficiency of a rotor system. In the online monitoring of aeroengine, sensors are mainly installed on the outer surface of casings to monitor the health status of rolling bearing, so that too long signal propagation path induces vibration signals attenuation, low signal to noise ratio (SNR) of fault signals, and difficult extraction of fault features [1]. erefore, it is urgent to study the weak fault diagnosis of intershaft bearings [2][3][4].…”

Section: Introductionmentioning

confidence: 99%

Fault Diagnosis of Intershaft Bearing Using Variational Mode Decomposition with TAGA Optimization

Jun

Wang

Zhou

et al. 2021

Shock and Vibration

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To efficiently extract the features of aeroengine intershaft bearing faults with weak signal, the variational mode decomposition (VMD) method based on the tolerant adaptive genetic algorithm (TAGA) (TAGA-VMD) is proposed by introducing the idea of tolerance into the traditional adaptive genetic algorithm in this paper. In this method, the tolerant genetic algorithm was adopted to find the optimum empirical parameters K and α of VMD. A fault simulation experiment system of intershaft bearings was built for the inner ring fault and outer ring fault of bearings to verify the proposed TAGA-VMD method. The results show that the proposed method can effectively extract the fault feature frequency of intershaft bearings, and the error between the extracted fault feature frequency and the theoretical value of fault frequency is less than 0.1%. The efforts of this study provide one promising fault feature extraction approach for aeroengine intershaft bearing fault diagnosis with weak signal.

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Fault Diagnosis of Intershaft Bearings Using Fusion Information Exergy Distance Method

Cited by 11 publications

References 25 publications

TdP Incidence in Methoxamine-Sensitized Rabbit Model Is Reduced With Age but Not Influenced by Hypercholesterolemia

TdP Incidence in Methoxamine-Sensitized Rabbit Model Is Reduced With Age but Not Influenced by Hypercholesterolemia

A Study on the Modeling Method of Cage Slip and Its Effects on the Vibration Response of Rolling-Element Bearing

Fault Diagnosis of Intershaft Bearing Using Variational Mode Decomposition with TAGA Optimization

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