3-D Analysis Platform Design And Development Of Ship Shafting

In order to meet the shafting alignment and vibration analysis based on single model input,visualize the shafting modeling and analysis results,and develop a modular,visual and highly integrated three-dimensional analysis platform for ship propulsion shafting.The works have done in this paper are as follows:The research and development of shafting analysis software at home and abroad were investigated.Besides,the analysis methods of shafting torsional vibration,longitudinal vibration,lateral vibration and torsional-axial vibration were summarized.And this paper re-derived the improved three-moment equations in the shafting alignment and compiled the MATLAB calculation program.Based on the ANSYS calculation platform,the method of loading constraints in the shafting alignment was studied.And a propulsion shaft system was used as an example to compare the MATLAB program and the finite element calculation results.Then the correctness of the analytical program and the finite element shafting alignment program were verified.In addition,the calculation method of ship's propulsion shafting lateral vibration based on transfer matrix method was studied.At the same time,the lateral vibration calculation command flow was written based on ANSYS analysis platform.Finally,the comparison between the two results confirms the correctness of the algorithm.What's more,this paper summarized the calculation method of torsional-axial vibration of shafting at home and abroad.Based on the existing research results,the discrete mathematical model of torsional-axial vibration calculation of ship propulsion shafting was established.And the mass matrix,stiffness matrix,damping matrix and excitation matrix were also established.In order to solve the kinematic differential equation,the MATLAB calculation program for torsional-axial vibration was programmed by the system matrix method.Using the joint simulation method of Hypermesh and MSC.Nastran,the three-dimensional model of the shafting entity was established,and the excitation loading,damping loading and degree of freedom constraint scheme of finite element calculation were studied.Then the feasible torsional-axial vibration modal analysis and harmonious response analysis method were determined.By comparing the calculation results with the existing torsional-axial vibration calculation report results,the correctness of the MATLAB calculation program and finite element analysis was verified.In this research,the secondary development method of NX Open API based on Visual Basic.NET language was analyzed.From the perspective of the ship propulsion shaft structure,the crankshaft modeling steps were analyzed with the focus on the crankshaft,and the parametric modeling method combining the crankshaft and the shaft segment was realized.The research analyzed the crankshaft modeling steps from the perspective of the ship's propulsion shaft structure to confirm the parametric modeling method of the crankshaft and shafting.Furthermore,the Visual Basic.NET language mixed with MATLAB and APDL programming methods were studied under the Visual Studio2015 platform.Based on above,a three-dimensional analysis platform of the ship shafting with complete independent intellectual property rights based on parametric modeling of single model input and integrated finite element alignment,torsional-axial vibration and finite element lateral vibration analysis functions was developed.Finally,through the test,the completeness of the platform function and the correctness of the calculation program were verified.