Utilising elastic waves of acoustic emission to assess the condition of spray nozzles in a marine diesel engine

Bejger, A.; Chybowski, Leszek; Gawdzińska, K.

doi:10.1080/20464177.2018.1492361

Cited by 18 publications

(17 citation statements)

References 4 publications

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“…This process destroys polar nitrogen and oxygen compounds, thus leading to a deterioration of the lubricity of diesel fuel. Fuel injection system parts deterioration after using low quality fuels is reported in analogous situations in marine engines [20]. Several researchers reported that biodiesel blending at low percentages may significantly improve the lubricating properties of low sulfur diesel fuel.…”

Section: Biodiesel Fuel Quality and Stability Problemsmentioning

confidence: 82%

Diesel-Injection Equipment Parts Deterioration after Prolonged Use of Biodiesel

Tziourtzioumis

Stamatelos

2019

Energies

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The application of biodiesel blends is known to significantly affect operation of diesel-injection equipment, especially the injectors and fuel pump. This paper summarizes experience on this subject from burning fuel blends with high-percentages of biodiesel (up to 70%) on a common-rail, high-pressure-injection diesel engine and a conventional DI engine. Both engines were unable to start after running for 100 h each and staying shut off for more than two months. In order to understand the wear characteristics of the injector nozzle, pump pistons, and elastomer parts (in the case of the high-pressure pump of the common-rail engine), due to the prolonged operation with high-percentage biodiesel blends, their injectors and pumps parts were examined and compared by performing normal photography and low magnification microscopy. Additionally, the various elastomer parts of the high-pressure fuel pump of the common-rail engine were examined for wear and deterioration. The results are compared with existing literature results from other researchers. The observed deterioration of diesel-injection equipment is caused by use of high-percentage biodiesel blends and subsequent engine shut down.

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Section: Biodiesel Fuel Quality and Stability Problemsmentioning

confidence: 82%

Diesel-Injection Equipment Parts Deterioration after Prolonged Use of Biodiesel

Tziourtzioumis

Stamatelos

2019

Energies

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“…In the AE source the function of amplitude changes in the stress field has a form of a unit/single peak, the sensor is placed in the pump body (housing of the valve unit, and the elastic wave propagates in a homogeneous medium. The basic equation describing the signal propagation path can have this form [11][12][13][14][15][16][17][18][19]:…”

Section: Application Of Acoustic Emission For Mud Pump Diagnosticsmentioning

confidence: 99%

The Use of Acoustic Emission Elastic Waves for Diagnosing High Pressure Mud Pumps Used on Drilling Rigs

Bejger

Piasecki

2020

Energies

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Although mud pumps are vital components of a drilling rig, their failures are frequent. The identification of technical condition of these high-pressure piston pumps is difficult. There are no reliable criteria for the assessment of mud pump condition. In this paper, faults of the pump valve module are identified by means of acoustic emission (AE) signals. The characteristics of these signals are extracted by wavelet packet signal processing. This method has been verified by experiments conducted on a NOV (National Oilwell Varco) -made triplex 14-P-220 mud pump (mounted in the drillship). The results show that the wavelet packet signal processing method can effectively extract the frequency band energy eigenvalues of the signals. Besides, some operational problems associated with high pressure piston mud pumps are presented. A non-invasive method for diagnosing the technical condition of such pumps is being developed at the Maritime University of Szczecin.

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“…As this research shown, although field measurement involves a lot of data collection and analysis, it is the most direct and reliable method in studying subway vibration propagation. Moreover, field measurement may be an original method of using elastic waves of acoustic emission to assess the technical condition of subway system, such as rail wear and structural damage [30,31].…”

Section: Vibration Isolation Designmentioning

confidence: 99%

Field Measurement and Research on Environmental Vibration due to Subway Systems: A Case Study in Eastern China

et al. 2019

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With the rapid development of subway systems, the negative environmental impacts of vibration induced by subways has gradually become a research hotspot. For the purpose of developing predictive models of vibration and designing effective vibration mitigation systems, continuous field dynamic measurements were conducted simultaneously in a subway tunnel, ground, and building in eastern China, the most prosperous region in China. The characteristics of vibration transmission and attenuation induced by subway were analyzed by statistical analysis of large amounts of measurement data. The results showed that most prominent and visible attenuation of vibration is from the track to the ballast bed in the tunnel, where the ground-borne vibration would quickly decrease exponentially with distance. The results also showed that the measured attenuation value of indoor vibration was approximate 0.76 dB on average between each floor. Moreover, the decay ratio of the vibration increased with the increase in the frequency range. Based on these findings, construction gauge of 20-25 m outside of the tunnel is recommended. In addition, reducing the vibration source excitation intensity is the most effective vibration isolation method, especially by track structural transformation. Sustainability 2019, 11, 6835 2 of 12The subway vibration effect on the surrounding environment is not only related to the tunnel structure, stratigraphic characteristics, and building structure, but also to the track and train [9]. Therefore, unlike vibration induced by other sources, such as airplanes, ground traffic or industrial machinery, vibration induced by subway has certain distinctive characteristics, such as low frequency, persistence, and longevity. Thus, more theoretic analysis and field measurements of the vibration induced by subway are also needed to determine causes, characteristics, and its effects.Among the various research methods, the numerical simulation is widely used to predict the environmental influence of vibration induced by subway [10]. Unfortunately, all the simplifying assumptions used in numerical models of ground vibration induced by subway could result in maximum errors of ±10 dB in predictions [11]. Although field measurement involves a lot of data collection and analysis, it is the most direct and reliable method in studying subway vibration propagation. Field measurement is also the only way of verifying the accuracy of other methods, especially when it comes to locally applicable ones [12][13][14].Although there have been many studies on subway vibration worldwide [8], further field measurement studies, specific to vehicle-track excitation source and vibration propagation, are still required. In this study, in order to ascertain the characteristics of vibration transmission and attenuation induced by subway, and to predict the environmental influence of subway train-induced vibration on ground and inside over-track buildings, the continuous dynamic measurement was conducted simultaneously in the subway tunnel, grou...

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Utilising elastic waves of acoustic emission to assess the condition of spray nozzles in a marine diesel engine

Cited by 18 publications

References 4 publications

Diesel-Injection Equipment Parts Deterioration after Prolonged Use of Biodiesel

Diesel-Injection Equipment Parts Deterioration after Prolonged Use of Biodiesel

The Use of Acoustic Emission Elastic Waves for Diagnosing High Pressure Mud Pumps Used on Drilling Rigs

Field Measurement and Research on Environmental Vibration due to Subway Systems: A Case Study in Eastern China

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