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Wu X.C.,Wuhan University of Technology | Wu X.C.,Key Laboratory of Marine Power Engineering and Technology | Wang Z.J.,Wuhan University of Technology
Advanced Materials Research

The control and regulation of SOx emissions have become a global urgent problem for the environment protection. In the field of ocean and marine engineering, The International Maritime Organization (IMO) has formally passed the amendment of MARPOL 73/78 Annex VI in 2008 that clarified the deadline of requirements on SOx emissions limit. A limitation of 3.5%mm is strictly requested during 2012 to 2020. Hence the SOx emissions of marine diesel engines faces unprecedented challenges while effective control and regulation systems on the SOx emissions reduction are scarce in the existing ships. To meet the IMO's requirements, this paper has presented a novel seawater exhaust gas cleaning (EGC) system for the SOx emissions reduction of marine diesel engines. The post-combustion desulfurization technology was employed in the EGC system. The carbon ion and hydrogen ion contained in the seawater have been introduced into the EGC system to participant the reaction of desulfurization. The seawater EGC system has already been established in a real ship. Experiments have been carried out with the established seawater EGC system to comparatively analyze SOX emissions characteristics when burning different oil types, including heavy oil and light oil. The experiment results show that the newly established seawater EGC system can achieve satisfactory performance with a desulfurization efficiency of 88%. More important, the standard of the SOX emission limitation set by IMO has been met by using the proposed EGC system. © (2014) Trans Tech Publications, Switzerland. Source

Huang Q.,Wuhan University of Technology | Liu J.,Wuhan University of Technology | Zhang C.,Wuhan University of Technology | Zhang C.,Key Laboratory of Marine Power Engineering and Technology | And 2 more authors.
INTERNOISE 2014 - 43rd International Congress on Noise Control Engineering: Improving the World Through Noise Control

With the improvement of the requirements of large ships to ship economy, the coupling dynamics problem of the ship propulsion shafting is particularly prominent. Theoretical method for propulsion shafting coupled vibration needs to be solved to improve the reliability of the propulsion shafting and raise the sailing performance of the ship. This paper mainly studies on the coupled torsional-longitudinal dynamics analytical theory and numerical simulation of the propulsion shafting. Different kindsof incentivescan cause different kinds of coupling responses. The changes of displacement and rotation angle caused by coupled torsional-longitudinal vibration of the propulsion shafting is studied by the finite element method. Through comprehensive analysis for the coupling response of the propulsion shafting under the condition of different applied loads individually and simultaneously, the research reveals the dynamics mechanism of coupled torsional-longitudinal vibration and puts forward the theoretical guidance for coupled torsional-longitudinal vibration of the propulsion shafting. Source

Wang L.,Wuhan University of Technology | Wang L.,Key Laboratory of Marine Power Engineering and Technology | Xiang Y.,Wuhan University of Technology | Xiang Y.,Key Laboratory of Marine Power Engineering and Technology
Applied Mechanics and Materials

The fractal surface profile can usually be represented by WM function, A fractal dimension and a fractal roughness parameter are very important characteristic parameters in WM function. Usually, fractal scaling parameter γ was set to equal to 1.5, fractal dimension can be determined by the structure function method, but the accurately identification of the fractal roughness parameter is still a problem. In the present study, a simply numerical scheme with clear routine was developed to determine the fractal roughness parameter, and the fractal roughness parameter were recovered with reasonable accuracy from the numerically generated rough surface profile based WM function. © (2013) Trans Tech Publications, Switzerland. Source

Yu Y.-H.,Wuhan University of Technology | Yu Y.-H.,Key Laboratory of Marine Power Engineering and Technology | Chen J.,Wuhan University of Technology | Yang J.-G.,Wuhan University of Technology | And 2 more authors.
Neiranji Gongcheng/Chinese Internal Combustion Engine Engineering

Features of applying support vector machine (SVM) to diesel engine fault diagnosis with small samples were discussed. The different levels of exhaust valve leakage in diesel engine were simulated in test laboratory. By combining parameter analysis method and wavelet packet analysis method to extract the sensitive fault characteristic parameters, the diagnosis model was established based on SVM. It is confirmed that the effective values in whose cycle, exhaust closed section and combustion section of the high-pass filtered cylinder head acoustic emission signals and the energy ratios of 3 frequency bands i.e. S2, S3 and S4, obtained by 3-level Daubechies8 wavelet packet decomposition can effectively indicate valve leakage faults, and the diagnosis model based on the six fault characteristic parameters can be used effectively to diagnose different level valve leakages and its classification performance is stable. Source

Zhao J.,Wuhan University of Technology | Zhao J.,Key Laboratory of Marine Power Engineering and Technology | Sheng C.,Wuhan University of Technology | Yuan C.,Wuhan University of Technology | And 2 more authors.
Chemical Engineering Transactions

Ships are offshore transport or working platforms. We developed an internet-enabled fleet technical condition management system by making ship connected to shore-resided technical management center. Operational data are uploaded automatically to management center for data storage, condition monitoring, trending, analysis, statistics, trouble shooting, and make operation and maintenance decisions. For it possible to apply a single system to manage a whole fleet, several technical aspects should be standardized. Data is the most fundamental part including machinery operating parameters, alarms, failure modes, and some others. We individualize and code these data and make them standard across the whole fleet, on-board monitoring system capture operating parameters snapshot periodically and all alarms, code, package and upload them. The Fleet management center system is a WEB application; all functions of it are designed against data standard. When fully realized, most management functions can be automated, to improve reliability, availability and maintainability of the whole fleet. Copyright © 2013, AIDIC Servizi S.r.l. Source

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