Durability and reliability in diesel engine system design

Xin, Qianfan

doi:10.1533/9780857090836.1.113

Cited by 27 publications

(10 citation statements)

References 161 publications

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“…A simultaneous physically and chemically crosslinked NIPAAm-based system has been developed, and it demonstrated increased strength and reduced creep (i.e., time-dependent permanent deformation under elevated temperatures and stresses, which are lower than the material's yield strength) in embolization applications. [351] Physical gels formed by secondary interactions are usually soft and easy to inject, though their viscoelastic properties are not suitable for AVM treatment given their tendency to undergo considerable creep [352] in response to the constant stress exerted by blood pressure. [353] Conversely, because chemically crosslinked gels are stronger and less viscoelastic due to covalent bonds, they can be difficult to inject and may undergo swelling at body temperature.…”

Section: Tandem Thermal Gelling Of a Chemical Crosslinking Systemmentioning

confidence: 99%

Advances in Biomaterials and Technologies for Vascular Embolization

et al. 2019

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Minimally invasive transcatheter embolization is a common nonsurgical procedure in interventional radiology used for the deliberate occlusion of blood vessels for the treatment of diseased or injured vasculature. A wide variety of embolic agents including metallic coils, calibrated microspheres, and liquids are available for clinical practice. Additionally, advances in biomaterials, such as shapememory foams, biodegradable polymers, and in situ gelling solutions have led to the development of novel pre-clinical embolic agents. The aim here is to provide a comprehensive overview of current and emerging technologies in endovascular embolization with respect to devices, materials, mechanisms, and design guidelines. Limitations and challenges in embolic materials are also discussed to promote advancement in the field.

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Section: Tandem Thermal Gelling Of a Chemical Crosslinking Systemmentioning

confidence: 99%

Advances in Biomaterials and Technologies for Vascular Embolization

et al. 2019

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“…19,20 In marine diesel engines, the hazardous situations include conditions such as high oil mist concentration in the engine crankcase, turbocharger (T/C) compressor surging, diesel engine camshaft overloading, inadequate lubrication, cooling and fuel supply, increased or fluctuating thermal loading and sudden engine tripping, which under worst case scenarios, may lead to high risk engine operating conditions. 21,22 For instance, component faults or failures in the auxiliary systems of a diesel engine may lead to engine inappropriate cooling, lubricating and fuelling. 23,24 Other failures leading to hazardous situations include the engine components health deterioration, such as piston rings, stuffing boxes, fuel injection system and air filters.…”

Section: Marine Diesel/df Engines Design and Operational Hazardsmentioning

confidence: 99%

Safety performance assessment of a marine dual fuel engine by integrating failure mode, effects and criticality analysis with simulation tools

Stoumpos

Bolbot

Theotokatos

et al. 2021

Proceedings of the Institution of Mechanical Engineers, Part M:

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Marine Dual Fuel engines have been proved an attractive solution to improve the shipping industry sustainability and environmental footprint. Compared to the conventional diesel engines, the use of additional components to accommodate the natural gas feeding is associated with several safety implications. To ensure the engine safe operation, appropriate engine control and safety systems are of vital importance, whilst potential safety implications due to sensors and actuators faults or failures must be considered. This study aims at investigating the safety issues of a marine dual fuel (DF) engine considering critical operating scenarios, which are identified by employing a Failure Mode, Effects and Criticality Analysis. An existing verified digital twin (DT) of the investigated DF engine, capable of predicting the engine response at steady state and transient conditions with sufficient accuracy is employed to simulate the engine operation for the identified scenarios. The simulated scenarios results analysis is used to support the risk priority number assessment and identify the potential safety implications by considering the manufacturer alarm limits. Appropriate measures are recommended for the investigated DF engine safety performance improvement. This study demonstrates a methodology integrating existing safety methods with state-of-the-art simulation tools for facilitating and enhancing the safety assessment process of marine DF engines considering both steady state conditions and transient operation with main focus on switching operating modes.

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“…At the same time, the strain life approach is 10 9 cycles. Based on the fatigue theory, when the number of cycles reaches 10 6 without damage, it can be mentioned that the components can last indefinitely / infinite cycles [17]. This shows that the stress applied to the camshaft will not break the camshaft or within the endurance limit of the material.…”

Section: Stress -Life Dan Strain Lifementioning

confidence: 99%

Camshaft Failure Simulation with Static Structural Approach

Prasetya¹,

Andoko

Suprayitno³

2021

JMEST

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A failure happens within the camshaft of the minibus when the vehicle is in utilize. The camshaft was a fracture within the bearing between the primary cylinder exhaust valve and the second cylinder suction. This simulation aims to find the causes of camshaft failure utilizing the finite element method with a static structural approach, including simulations of deformation, strain, stress, fatigue life (stress-life and strainlife), and cracks. The method used in this paper is the finite element method with a static structural approach by ANSYS software. The camshaft material is a gray cast iron designed using Solidworks. Pre-processing includes meshing with a size of 3 mm. The value of loading force (1348.28 N) and torque (113400 Nmm) are fixed, and the boundary conditions are varied. Processing includes the process of computation and postprocessing into a part that displays the results. The simulation results show that for all the deformation and strain values that are in the elasticity area of the material, the maximum and minimum stress which is below the strength of the material, the location of the maximum values of deformation, strain, and stress is not at the fault location. The simulation of fatigue life both in stress-life and strain-life results in infinite cycles, which is above 10 6 cycles, while the simulation of cracks results in a decrease in the cycle. Based on the simulation results with the above parameters to the camshaft, it was found that a failure was caused by a defect characterized by reduced fatigue life at the same loading conditions.

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Durability and reliability in diesel engine system design

Cited by 27 publications

References 161 publications

Advances in Biomaterials and Technologies for Vascular Embolization

Advances in Biomaterials and Technologies for Vascular Embolization

Safety performance assessment of a marine dual fuel engine by integrating failure mode, effects and criticality analysis with simulation tools

Camshaft Failure Simulation with Static Structural Approach

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