Fault diagnosis of water hydraulic actuators under some simulated faults

Tan, Alfred; Chua, Patrick S. K.; Lim, G.H.

doi:10.1016/s0924-0136(03)00060-8

Cited by 11 publications

(9 citation statements)

References 2 publications

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“…This is due to the unstable behavior in the cylinder head caused by fluid leakage which results in increase in amplitude and power of the AE signal (Figure 5 and Figure 6). Compared to the condition monitoring studies performed by Zhao et al (2015) using a pressure sensor and Tan et al (2003) using a vibration sensor, the energy value of the AE signal tends to increase in our study for the worn piston rod seal when compared to the unworn piston rod seal (Figure 8-a)). This is likely due to the high working frequency range of the AE sensor which makes it sensitive to the noise generated by the leakage in the cylinder head (Chen at al.…”

Section: Discussioncontrasting

confidence: 70%

“…The wavelet packet energy variance, wavelet energy of coefficient 1 in level 4, wavelet entropy feature, pressure rising speed and piston rod stretching speed were proposed to monitor the leakage. Tan et al (2000Tan et al ( & 2003 used vibration measurements to understand the vibration signatures from reciprocating machinery such as hydraulic cylinders. From the vibration data analysis, it was observed that removal of the piston seal in the hydraulic cylinder studied lead to an increase in amplitude at a frequency of 48.8 Hz and with the piston seal installed in the hydraulic cylinder the frequency peak was observed at 96.6 Hz in the amplitude-frequency spectrum.…”

Section: Introductionmentioning

confidence: 99%

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Acoustic emission based condition monitoring study of piston rod seals by varying speed and pressure parameters

Meyer

Schlanbusch

2020

PHM_CONF

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Hydraulic cylinders are used in a wide range of applications such as oil drilling equipment, construction vehicles and manufacturing machines. Seal failure is one of the primitive causes of failure in hydraulic cylinders, possibly leading to fluid spill, unscheduled maintenance, reduced availability and thus leading to lower productivity. Regular visual inspection of seals without affecting the productivity is difficult as the seals are placed internally in the hydraulic cylinder requiring disassembly of the piston. Therefore, condition monitoring is required to assess the current health of the seals. There have been successful attempts made in literature for the assessment of seal quality using acoustic emission-based condition monitoring. However, there have been very few studies performed to diagnose the seal failure under varying speed and pressure parameters. Therefore, this study aims at increasing the understanding of seal failure under varying speed and pressure conditions through correlation with the acoustic emission signal. Experiments were performed on a hydraulic test rig using unworn, semi-worn and worn piston rod seals. For each seal wear condition, experiments were performed for five strokes at pressure conditions of 10, 20, 30 and 40 bar and speeds of 50 mm/s and 100 mm/s. Continuous acoustic emission data were acquired during all the tests. The acoustic emission signal of each piston rod stroke was analyzed using different acoustic emission features such as power spectral density, root mean square, peak, mean frequency, median frequency and band power. From the acoustic emission analysis, by using power spectral density, mean frequency and median frequency feature it is possible to identify and segregate unworn seal, leakage due to semi-worn seal and leakage due to worn seal in the test rig. The acoustic emission-based condition monitoring methodology developed in this study lays a strong foundation for further research to develop real-time monitoring of the piston rod seal in hydraulic cylinders that are used in the offshore industry.

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Section: Discussioncontrasting

confidence: 70%

Section: Introductionmentioning

confidence: 99%

Acoustic emission based condition monitoring study of piston rod seals by varying speed and pressure parameters

Meyer

Schlanbusch

2020

PHM_CONF

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“…Tan et al [ 13 , 14 ] and Yunbo et al [ 15 ] investigated the use of vibration sensors to diagnose faults in water hydraulic actuators. A linear actuator was tested with unworn and worn piston and rod seals to diagnose both external and internal leakage.…”

Section: Introductionmentioning

confidence: 99%

Acoustic Emission-Based Condition Monitoring and Remaining Useful Life Prediction of Hydraulic Cylinder Rod Seals

Pedersen

Schlanbusch

Meyer

2021

Sensors

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The foremost reason for unscheduled maintenance of hydraulic cylinders in industry is caused by wear of the hydraulic seals. Therefore, condition monitoring and subsequent estimation of remaining useful life (RUL) methods are highly sought after by the maintenance professionals. This study aimed at investigating the use of acoustic emission (AE) sensors to identify the early stages of external leakage initiation in hydraulic cylinders through run to failure studies (RTF) in a test rig. In this study, the impact of sensor location and rod speeds on the AE signal were investigated using both time- and frequency-based features. Furthermore, a frequency domain analysis was conducted to investigate the power spectral density (PSD) of the AE signal. An accelerated leakage initiation process was performed by creating longitudinal scratches on the piston rod. In addition, the effect on the AE signal from pausing the test rig for a prolonged duration during the RTF tests was investigated. From the extracted features of the AE signal, the root mean square (RMS) feature was observed to be a potent condition indicator (CI) to understand the leakage initiation. In this study, the AE signal showed a large drop in the RMS value caused by the pause in the RTF test operations. However, the RMS value at leakage initiation is seen to be a promising CI because it appears to be linearly scalable to operational conditions such as pressure and speed, with good accuracy, for predicting the leakage threshold.

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“…The first solution is to use a biodegradable oil [1][2][3][4][5][6] instead of a mineral oil, while the second -and better -solution is to use tap water instead of mineral oil. This solution is harmless to the environment, but it is very difficult to realize [7][8][9]. One reason being that only some relatively simple, conventional control valves exist on the market today.…”

Section: Introductionmentioning

confidence: 99%

Tribological Aspects of Water Hydraulics

Majdič¹,

Strmčnik²

2019

PES

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A clean and healthy environment must be an increasing priority. Different kinds of hydraulic fluids are in use nowadays. Unfortunately, the majority of them are harmful. The use of tap water as a hydraulicpressure medium is one of the possible solutions. This study presents the research and development of different hydraulics components. Every research of a new water-hydraulic component starts with basic tribological investigations of different material pairs and their surfaces. Then follows the design and calculations of the hydraulics characteristics, the production of a prototype and its experimental investigations. The following water-hydraulic components, i.e., proportional control valve, hydraulic cylinder, piston pump, hydraulic accumulator, check valve and hydraulic motor, will be presented.

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Fault diagnosis of water hydraulic actuators under some simulated faults

Cited by 11 publications

References 2 publications

Acoustic emission based condition monitoring study of piston rod seals by varying speed and pressure parameters

Acoustic emission based condition monitoring study of piston rod seals by varying speed and pressure parameters

Acoustic Emission-Based Condition Monitoring and Remaining Useful Life Prediction of Hydraulic Cylinder Rod Seals

Tribological Aspects of Water Hydraulics

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