A software for rapid estimation of the natural frequency of the stern frame vibration has been developed in order to quickly estimate the important parameter of the natural frequency of the stern frame vibration. This software uses QT and MATLAB for interface design and core solver compilation based on the empirical formula for the calculation of the natural frequency of stern frame vibration given in the “Method for Structural Design and Strength Calculation of Naval Surface Ships”. The influence of different hull parameters on the vibration of the stern frame is summarized based on the developed software system. It is found that the factors affecting the natural frequency of the single-arm stern frame are mainly the length of the shaft frame arm and the average inertia moment of the shaft frame section, and the factors affecting the natural frequency of the double-arm stern frame are the length of the shaft frame arm, the cross-sectional area of the shaft frame arm, and the angle between the shaft centerline and the plane of the shaft frame. The results can provide references for the selection of parameters during the design of the stern frame. The practical value of this software is demonstrated in the rapid estimation of the natural frequency of the stern frame vibration.

Owing to the complex geometric curved surface of the propeller, general software for the rapid prediction of the vibration characteristics of the propeller with trailing edge cutting is developed for the geometric modelling and vibration analysis of the trailing edge cutting. The development of the software for the vibration analysis of the propeller with trailing edge cutting is completed by using the finite element method together with the MATLAB programming language and the ANSYS module based on the QT platform. This software is used to calculate and analyze the first five-order natural frequency values of the 4384 propeller. It is found that the relative errors are within 5% combined with the published data in order to prove the accuracy of the software program and the calculation results. The software is characterized of easy usage, fast calculation and great engineering application value. It provides a new analysis method for the matching of ship-machine-propeller after the trailing edge cutting.