| The installation of new naval ship propulsion shafting plays an important role in the process of shipbuilding, and whether main propulsion shafting can be correctly installed will directly influence the safety of the ship maneuver and sailing. Based on the construction of the first batch of domestic high-tech new naval ship, in order to effectively improve the construction quality, to shorten the construction period, to control the construction cost, the thesis will use the methods of quality and period control to optimize the installation for the long shafting in main propulsion system.Naval ship needs to meet the characteristics of light weight and flexible manipulation, so ship’s hull structure should be made of thin steel plate with good rigidity during the shipbuilding, which resulting in hull structure relatively soft and easy to deformation. As for these adverse factors, it is hard to correctly positioning the seating of the main engine and gearbox, accurately locating the forward and afterward shaft bracket, precisely boring the shaft bracket bearing.Firstly,the thesis will apply quality control chart to calculate general average, range average and control limit for the corresponding hull deflection data below main engine and gearbox’s seating, and then draw the chart to judge and adjust the hull base line until the deflection data is under control, and finally finish positioning the seating of the main engine and gearbox.Secondly,the thesis will apply process capability analysis to shaft bracket bearing boring. If the boring CPK(capability index of process) is less than 1.0, it indicates that the boring capability is inadequate, and the boring quality will be out of control. It is necessary to change the original boring condition and update the equipment, and then make sure that the new equipment’s CPK is more than 1.0, which indicates this new process capability is under control and guarantees the boring precision and quality.Finally, during the measurement and adjustment of shaft bearing load, the thesis will update the original technology and apply EXCEL to classify the shaft jack-up data, simulate the load curve, and then find out the variation trends, which will shorten the adjustment period from 49 days to 34 days and make the whole installation period of main propulsion system under control. |
