Propeller Shaft Condition Monitoring Technology,

In the last few years, with the development of ship maintenance system, oil monitoring technology is applied to ship field gradually. Ship's stern shaft system is an important part of the ship power system, so the wearing degree and defective instance of the stern shaft and it's bush, shaft bearing and bearing shell come down to the ship's voyage safety directly. In this paper, according to the character of the ship stern system and the factors that effect it's capability, such as environment, utilizing the experience of the field expert, and combined with the practice of ship manufacturing and maintenance, namely oil quality testing, spectrometric oil analysis, and Ferrography analysis etc, is studied respectively, and then models for data processing are established and identifying technology of Abrasive particles is introduced. On the basis of this, it has been preliminary used the synthesis and infusion methods of information to process the result of the data, using the lubricating oil measuring of several typical ship stern shaft as examples. At last, A Ship Stern Shaft Lubricant State Monitoring System is programmed. The monitoring system to ship stern shaft is used to store analyzed data, to analyze data, to do trend analysis and to scout disposed course, in order to analyze the malfunction and accumulate experience.The paper mainly adopts following research methods: the method of the documents and materials, the method of practice research, the method of investigation and analysis to the case , and also, the method of induction and deduction etc. The main function of the ship stern shaft state monitoring technology is: Analyzing the change of the parameters and the quality of stern shaft system oil, monitoring the inferior change of the oil quality; Analyzing the wearing elements, contamination elements and additive elements and the debris in the oil sample, search after the affiliation between the character and the wear condition and the failure of the part of the device. Study the affection of the contamination in the oil to the performance and condition of the device. Colligating the primitive data, such as the type, running environment, running condition, maintenance activity etc, of the ship stern shaft system and device and the experiment data, realizing the condition monitoring and fault diagnosing technology, directing the management and using of the oil, providing advice to the maintenance and inspection of the ship stem shaft system anddevice.The main tasks of the paper are: Studying the wearing theory of equipment and the importance of lubricant's capability analysis; Establishing different but appropriate mathematics model according to different detection mode and data character; According to the characteristic of multi-technology, the paper has discussed information colligation and amalgamation technology in theory, and has put the technology into practice primarily; programming A Ship Stem Shaft Lubricant State Monitoring application.The final aim of the study item is to reduce the failure rate, repair & maintenance expense and workload of ship stem shaft system, to prolong the cycle of ship inspection and to enhance ship working rate. It can also help ship management department to strengthen the safety of ship stern shaft system, the economical working and the safety of sail. It helps ship management to accord with the criterion about ship screw shaft state monitoring system of Classification Societies. It provides technology protection to the technology innovation of the ship management department.On the basis of many kinds of investigation and in-depth analysis, this thesis draws the following conclusions: synthetically using the mathematics method such as trend analysis, fuzzy mathematics and time series analysis to analyze the parameter data drawn from the fluid measure, we can improve the accuracy and reliability of state recognition and prediction; implementing the state monitoring to propeller shaft system, we can raise the dependability of the stem and axle system, and also raise the operation rate of boat; The state monitoring of the propeller shaft can also lengthen the overhaul and checkout interval of the mechanical equipments, thus prevent mechanical disordering caused by unnecessary dismantling and save expenses.Meng Zhaoyu(Marine Engineering) Directed by Zheng Shijun...