Leakage fault detection in Electro-Hydraulic Servo Systems using a nonlinear representation learning approach

Sharifi, Siavash; Tivay, Ali; Rezaei, Seyed Mehdi; Zareinejad, Mohammad; Mollaei-Dariani, B.

doi:10.1016/j.isatra.2018.01.015

Cited by 43 publications

(30 citation statements)

References 13 publications

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“…It will be considered in a future study. As mentioned in Section 2, using the proposed form (11) and ASTW observer (12) provides the reconstruction of any matched and unmatched perturbations including uncertainties, disturbances, friction and faults that exist on cylinder dynamics. In this case, experimental tests are performed in a free-motion condition for the cylinder.…”

Section: Resultsmentioning

confidence: 99%

“…Finally, a first-order sliding mode observer is used for state observation and fault reconstruction. In proposed form (11), the second-order system (cylinder dynamics) is considered as a separate subsystem and using ASTW observer (12) provides the reconstruction of disturbances/faults on the unmeasurable part (cylinder velocity). Consequently, there is no need for any conditions on the distribution of system faults.…”

Section: Adaptive Super-twisting Observer Designmentioning

confidence: 99%

“…Remark 2. The presented form (11)(12) can be generalized for a class of nonlinear systems for the objective of nonlinear observer design and/or fault reconstruction. Some of these nonlinear systems are robot manipulators powered by electrical, hydraulic or pneumatic drive systems, turbocharged Engines, PEM fuel cell air-feed systems, switching power converters, etc.…”

Section: Adaptive Super-twisting Observer Designmentioning

confidence: 99%

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Adaptive super-twisting observer for fault reconstruction in electro-hydraulic systems

2018

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An adaptive-gain super-twisting sliding mode observer is proposed for fault reconstruction in electro-hydraulic servo systems (EHSS) receiving bounded perturbations with unknown bounds. The objective is to address challenging problems in classic sliding mode observers: chattering effect, conservatism of observer gains, strong condition on the distribution of faults and uncertainties. In this paper, the proposed super-twisting sliding mode observer relaxes the condition on the distribution of uncertainties and faults, and the gain adaptation law leads to eliminate observer gain overestimation and attenuate chattering effects. After using the equivalent output-error-injection feature of sliding mode techniques, a fault reconstruction strategy is proposed. The experimental results are presented, confirming the effectiveness of the proposed adaptive super-twisting observer for precise fault reconstruction in electro-hydraulic servo systems.

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Section: Resultsmentioning

confidence: 99%

Section: Adaptive Super-twisting Observer Designmentioning

confidence: 99%

Section: Adaptive Super-twisting Observer Designmentioning

confidence: 99%

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Adaptive super-twisting observer for fault reconstruction in electro-hydraulic systems

2018

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“…Therefore, extensive attempts have recently been made to develop highly corrosion resistant coatings on the steels and as a result, the conventional Zn coatings are being replaced by Zn alloys. [2][3][4][5][6][7] Zinc-nickel, zinc-iron, and zinc-cobalt are the most widely utilized alloys for coating, even though zinc-manganese, appeared to have an excellent corrosion resistance, is not commercially available. 8 It has been stated in several studies that corrosion resistance of electrodeposited Zn-Ni alloy coatings within a certain composition range (9-15 wt.%) can be significantly higher (5 to 6 times) than that of pure zinc.…”

Section: Introductionmentioning

confidence: 99%

The Effect of accelerator types on the phosphate Zn-%12Ni electrodeposite coating

Pakseresht¹,

Alizadeh²,

Hanaei³

et al. 2018

MSEIJ

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The aim of this study is to investigate the effect of nitrate and nitrite on the weight, morphology and electrochemical properties of phosphate Zn-%12Ni electrodeposited coatings. In order to investigate the phase structure and surface morphology of samples, X-ray diffraction and scanning electron microscopy were employed. Also, to measure the corrosion resistance behavior of the coats, Potentiostat/Galvanostat test was used. The results showed that nitrite accelerator reduces coating weight and surface porosity simultaneously obtaining by phosphating solution. Furthermore, coatings being obtained by the nitrite accelerator had a higher corrosion resistance than that of the nitrate accelerator.

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“…1 It can fully meet the requirements of the ordinary civil industry, even though the electrohydraulic servo system has better response speed and control precision. 2 The electro-hydraulic proportional valve made its appearance to improve overall technology level of the mobile hydraulic machinery, especially the field of electronically controlled pilot operation, wireless remote control, and wired remote control. 3 For example, electro-hydraulic proportional valve is widely applied in pilot and remote control of engineering machinery for simplifying the operation, improving the efficiency and accuracy of operations, and realizing intelligent operation.…”

Section: Introductionmentioning

confidence: 99%

Experimental and numerical investigations of the ball-screw-type coupling in two-dimensional electro-hydraulic proportional directional valve

Zuo

Sun

et al. 2018

Advances in Mechanical Engineering

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To realize rotary and linear motions of a single spool for improving a proportional displacement of the spool, a new structure of ball screw compression-torsion coupling is proposed, which is used in the two-dimensional electro-hydraulic proportional directional valve. Its principal is based on changing the spiral angle of the raceway to magnify the thrust of a wet proportional electromagnet and realize the rotary to linear motion of a single spool. In addition, because of the rolling friction instead of the sliding friction, the friction resistance is reduced. The mathematical model of the valve is established and the characteristics of the valve are simulated and analyzed by MATLAB. Theoretical and experimental results show that the no-load hysteresis of the ball screw compression-torsion coupling is up to 1% under the flutter compensation. At the system pressure of 21 MPa, the flow hysteresis of the valve is less than 5%, and the nonlinear degrees of the input displacement of electromagnet and the output displacement of the valve core are both less than 1%. The width of the valve corresponding to 23 dB and 290°is about 12 Hz, and the step response time of the valve is about 0.45 s without overshoot.

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Leakage fault detection in Electro-Hydraulic Servo Systems using a nonlinear representation learning approach

Cited by 43 publications

References 13 publications

Adaptive super-twisting observer for fault reconstruction in electro-hydraulic systems

Adaptive super-twisting observer for fault reconstruction in electro-hydraulic systems

The Effect of accelerator types on the phosphate Zn-%12Ni electrodeposite coating

Experimental and numerical investigations of the ball-screw-type coupling in two-dimensional electro-hydraulic proportional directional valve

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