Leakage and assembly of gasket in truck exhaust aftertreatment systems

Ravikumar, Aneesh; Rietz, Andreas

doi:10.1016/j.engfailanal.2021.105463

Cited by 4 publications

(1 citation statement)

References 17 publications

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“…While extensive studies have been conducted on vehicle reliability and its components [20][21][22][23][24][25][26][27][28][29][30][31][32][33][34], limited attention has been given to DPF reliability. This paper aims to ll this gap by analyzing the reliability of DPF systems in diesel vehicles through after-sales service data and conducting laboratory analysis on a sample lter to understand failure mechanisms and ash compositions.…”

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confidence: 99%

Failure Behavior and Reliability analysis of Diesel Particulate Filters based on After-sales Maintenance Data

Ahmadbeigi,

Ehteram,

Naeimi

2024

Preprint

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Diesel particulate filters (DPFs) are essential tools for controlling pollution emissions. However, some DPFs may encounter failures during operation, thereby posing risks to both the diesel vehicle engine and emission control. Low-quality diesel fuel, due to its higher sulfur content, raises the risk of DPF becoming inactive. This paper examines the reliability of DPFs from a leading national vehicle manufacturer, utilizing after-sales maintenance data. Statistical analysis has been conducted on 10,833 vehicles over the years 2018 to 2022. In addition, the records of failures, the root causes of malfunctions, and the factors influencing the failures of these filters have also been investigated. The results indicate that the highest percentage of failures is associated with urban buses, and the least reliable are mini-buses. In such a way that, it can be stated that the DPFs of all mini-buses malfunction at least once after 17,000 kilometers, which is significantly lower than the defined threshold of 100,000 kilometers. The main causes of damage to the DPF substrate are leaks in the fuel and lubrication systems. Additionally, laboratory analysis of a silicon carbide DPF sample, using scanning electron microscopy (SEM) and X-ray diffraction (XRD), revealed corrosion within the DPF substrate. The chemical compounds obtained from laboratory studies indicate a high percentage of sulfur (2.28% by weight) in diesel fuel and oil leakage into the DPF. Chemical compounds obtained from laboratory studies indicate a high percentage of sulfur (2.28% by weight) in diesel fuel and oil leakage to the DPF. This study accurately demonstrates the alignment of results obtained from simulation, reliability assessment, failure root cause analysis, and laboratory analysis.

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mentioning

confidence: 99%

Failure Behavior and Reliability analysis of Diesel Particulate Filters based on After-sales Maintenance Data

Ahmadbeigi,

Ehteram,

Naeimi

2024

Preprint

View full text Add to dashboard Cite

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Weibull Analysis of DPF Failure Events and Reliability of Diesel Particulate Filters Utilizing After-Sales Maintenance Data

Ahmadbeigi,

Ehteram,

Naeimi

2024

Emiss. Control Sci. Technol.

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Diesel particulate lters (DPFs) are essential tools for controlling pollution emissions. However, some DPFs may encounter failures during operation, thereby posing risks to both the diesel vehicle engine and emission control. Low-quality diesel fuel, due to its higher sulfur content, raises the risk of DPF becoming inactive. This paper examines the reliability of DPFs from a leading national vehicle manufacturer, utilizing after-sales maintenance data. Statistical analysis has been conducted on 10,833 vehicles over the years 2018 to 2022. In addition, the records of failures, the root causes of malfunctions, and the factors in uencing the failures of these lters have also been investigated. The results indicate that the highest percentage of failures is associated with urban buses, and the least reliable are mini-buses. In such a way that, it can be stated that the DPFs of all mini-buses malfunction at least once after 17,000 kilometers, which is signi cantly lower than the de ned threshold of 100,000 kilometers. The main causes of damage to the DPF substrate are leaks in the fuel and lubrication systems. Additionally, laboratory analysis of a silicon carbide DPF sample, using scanning electron microscopy (SEM) and Xray diffraction (XRD), revealed corrosion within the DPF substrate. The chemical compounds obtained from laboratory studies indicate a high percentage of sulfur (2.28% by weight) in diesel fuel and oil leakage into the DPF. Chemical compounds obtained from laboratory studies indicate a high percentage of sulfur (2.28% by weight) in diesel fuel and oil leakage to the DPF. This study accurately demonstrates the alignment of results obtained from simulation, reliability assessment, failure root cause analysis, and laboratory analysis.

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Airtightness Sealing Performance and Failure Mechanism of the Circumferential Joint in the Low-to-Vacuum Maglev Segment Tunnel

Zhou¹,

Shi

Wang

et al. 2023

Applied Sciences

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Segment lining structure is one of the choices to be used for low-to-vacuum maglev tunnels in the future. The airtightness at the joints of the lining structures is one of the critical problems that need to be addressed. However, little attention has been devoted to this problem until now. In this paper, a new apparatus was invented and used to study the mechanical behavior and airtightness sealing capacity of the gasket-in-groove, and a finite element analysis (FEA) model, validated by the test, was developed and used to further investigate thoroughly the sealing performance and sealing failure mechanism of the gasket-in-groove. The results obtained by the above two methods were discussed and compared, and a series of findings were presented. The results showed that the initial pressure distribution on the gasket–gasket contact surface is not uniform due to the presence of the inner holes in the gasket and the grooves between the gasket legs and an approximate “W” shape distribution in this study. The effect of vacuum pressure on the contact pressure distribution is very significant and shows an overall decreasing trend with increasing vacuum pressure. A higher initial maximum contact pressure would provide a better sealing effect but a lower sealing safety factor. Airtightness failure induced by evacuation is a contact surface separation process in which the maximum contact pressure shows a tendency to rise sharply with vacuum pressure increases, followed by a slow drop, and then declines dramatically to zero.

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Leakage and assembly of gasket in truck exhaust aftertreatment systems

Cited by 4 publications

References 17 publications

Failure Behavior and Reliability analysis of Diesel Particulate Filters based on After-sales Maintenance Data

Failure Behavior and Reliability analysis of Diesel Particulate Filters based on After-sales Maintenance Data

Weibull Analysis of DPF Failure Events and Reliability of Diesel Particulate Filters Utilizing After-Sales Maintenance Data

Airtightness Sealing Performance and Failure Mechanism of the Circumferential Joint in the Low-to-Vacuum Maglev Segment Tunnel

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