The Structure Strength Analysis Of Axial Flow Pump With Finite Element Method

The axial flow pump using on ship is a kind of water pump with high rotation rate. The main function of this pump is supplying cooling circulatory water. In order to guarentee the normal working condition of axial flow pump, the structure strength analysis of main parts of axial flow pump has been calculated with finite element method in the thesis.Taking the configuration data of axial flow pump of the certain ship as input, there have been 31 parts built and assembled. According to the data achieved from the test, the anti-design of impeller and guide-vane apparatus have been completed by the means of hydraulic power postulate. The reconstruction of the total model of axial flow pump has been actualized and the integrity of three-dimensional data has been guaranteed. The complicated three-dimensional solid model in Pro/E has been transformed into finite element model in ANSYS. The structural strength of the main parts including pump body, pump shaft and impeller has been analysed. According to the results which are illustrated by cloudscape, the distribution of the stress and strain has been realized from all side. The conventional strength check and safety coefficient have been calculated to ensure the security and reliability. According to the comparison between conventional results and the finite element analysis, it has been testified that the main parts of circulating pump completely meet the design requirement.Since the mathematical model is based on the idealized one, errors are bound to exist. Luckily, the errors can be diminished through picking up the data such as the position of center of gravity, moment inertia and cross-sectional area of impeller from the 3D model. In addition, since the traditonal algorithm simplifies the vane to the viberation of ancon, the influence of hub is ignored. In order to prevent the phenomenon of fatigue and damnification, the inherent frequency of impeller has been achieved through mode analysis. It is found that the syntony phenomenon will not happen through comparing the inherent frequency and shock excitation frequency. Finally, the optimization of the structure of shell has been completed according to the results of the analysis and the security and reliability of axial flow pump have been testified...