Experimental study of hydraulic cylinder leakage and fault feature extraction based on wavelet packet analysis

Zhao, Xiaole; Zhang, Shuanshuan; Zhou, Chuanli; Hu, Zhemin; Li, Rui; Jiang, Jihai

doi:10.1016/j.compfluid.2014.09.034

Cited by 69 publications

(41 citation statements)

References 7 publications

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“…In order to increase the fault information and improve the sensitivity of the fault diagnosis, Zhao et al [96] and Chao [97] adopted the method of wavelet packet signal decomposition to process the pressure signal and use the energy distribution for each level of the wavelet to diagnose the leakage fault. Wang et al [98] further combined the wavelet packet signal decomposition method with the feature data principal component analysis method while adding the fault features with the feature data extracted from the characteristic curve to facilitate rapid fault diagnosis.…”

Section: Data-based Fault Diagnosis Methodsmentioning

confidence: 99%

Research and Development of Electro-hydraulic Control Valves Oriented to Industry 4.0: A Review

Shen

Liu

et al. 2020

Chin. J. Mech. Eng.

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Electro-hydraulic control valves are key hydraulic components for industrial applications and aerospace, which controls electro-hydraulic motion. With the development of automation, digital technology, and communication technology, electro-hydraulic control valves are becoming more digital, integrated, and intelligent in order to meet the requirements of Industry 4.0. This paper reviews the state of the art development for electro-hydraulic control valves and their related technologies. This review paper considers three aspects of state acquisition through sensors or indirect acquisition technologies, control strategies along with digital controllers and novel valves, and online maintenance through data interaction and fault diagnosis. The main features and development trends of electro-hydraulic control valves oriented to Industry 4.0 are discussed.

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Section: Data-based Fault Diagnosis Methodsmentioning

confidence: 99%

Research and Development of Electro-hydraulic Control Valves Oriented to Industry 4.0: A Review

Shen

Liu

et al. 2020

Chin. J. Mech. Eng.

View full text Add to dashboard Cite

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“…The sealing characteristic of the hydraulic system structure results in hydraulic faults being concealed and easily affected by random factors. The mapping relationship between the signal characteristics and the system state is also complex [18,19]. Therefore, choosing a right diagnosis method is very critical.…”

Section: Introductionmentioning

confidence: 99%

Analysis of Weak Fault in Hydraulic System Based on Multi-scale Permutation Entropy of Fault-Sensitive Intrinsic Mode Function and Deep Belief Network

Huang

Wang

et al. 2019

Entropy

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With the aim of automatic recognition of weak faults in hydraulic systems, this paper proposes an identification method based on multi-scale permutation entropy feature extraction of fault-sensitive intrinsic mode function (IMF) and deep belief network (DBN). In this method, the leakage fault signal is first decomposed by empirical mode decomposition (EMD), and fault-sensitive IMF components are screened by adopting the correlation analysis method. The multi-scale entropy feature of each screened IMF is then extracted and features closely related to the weak fault information are then obtained. Finally, DBN is used for identification of fault diagnosis. Experimental results prove that this identification method has an ideal recognition effect. It can accurately judge whether there is a leakage fault, determine the degree of severity of the fault, and can diagnose and analyze hydraulic weak faults in general.

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“…e asymmetric hydraulic cylinder is used as the activator for a hydraulic rock-breaker, which attracts many research interests in recent years. Zhao et al used the wavelet packet analysis method to distinguish different levels of leakage in the hydraulic cylinder [1]. Chen et al developed a hydraulic cylinder with adaptive variable clearance and studied the static and dynamic performance, which can be applied to the hydraulic system with high frequency response and high speed [2].…”

Section: Introductionmentioning

confidence: 99%

Dynamic Analysis of a Planar Hydraulic Rock‐Breaker Mechanism with Multiple Clearance Joints

Chen

Zhang

et al. 2019

Shock and Vibration

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Clearance exists in the joint of a mechanism because of the assemblage, manufacturing tolerances, wear, and other conditions, and it is a focus of research in the field of multibody dynamics. This study built a planar hydraulic rock-breaker model with multiple joint clearances by combining the hydraulic cylinder model, the clearance joints based on the Lankarani–Nikravesh contact force model, and the Lagrange multiplier method. Dynamic simulation results indicated that multiple clearance joints can degrade the dynamic responses of a rock-breaker model, which can be decomposed to rapid vibrations and slow movements. The rapid vibrations are excited by coupling the spring-mass system of hydraulic cylinder and clearances. The effects of the clearance size, input force, damping coefficient, and friction on the dynamic behaviour of the rock-breaker mechanism are also investigated. The friction could reduce the rapid vibration state significantly, which is feasible for practical engineering applications. As compared with the traditional models without clearances, the present model provides not only better predictions for the theoretical study of the hydraulic rock-breaker but also useful guidance for reducing the vibrations of the hydraulic rock-breaker in practical engineering applications.

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Experimental study of hydraulic cylinder leakage and fault feature extraction based on wavelet packet analysis

Cited by 69 publications

References 7 publications

Research and Development of Electro-hydraulic Control Valves Oriented to Industry 4.0: A Review

Research and Development of Electro-hydraulic Control Valves Oriented to Industry 4.0: A Review

Analysis of Weak Fault in Hydraulic System Based on Multi-scale Permutation Entropy of Fault-Sensitive Intrinsic Mode Function and Deep Belief Network

Dynamic Analysis of a Planar Hydraulic Rock‐Breaker Mechanism with Multiple Clearance Joints

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