| Aiming at the present designing condition of domestic stern A-frame(A-frame for short), CAD/CAE is used to improve the behindhand designing method. In traditional method, a lot of hypothesises and simplifications will be made, and it will bring a lot of disadvantages, such as low precision, large safe factors, high cost and so on. The thesis resolves these disadvantages and greatly improves the structure performance of A-frame.Pro/Engineer and ANSYS are selected as the design and analysis system (CAD/CAE). Aiming at difficulty to solid modeling complex mechanical parts, Pro/Engineer is selected to do 3D solid modeling for A-fame. For main components of A-frame, firstly 3D solid modeling is done in Pro/Engineer, then elementary finite elements analysis (FEA for short) is done in Mechaica environment. According to the analysis result, improvement is done to the structure until reaching relatively eligible result. At last, by data exchange interface——IGES, the model is imported to ANSYS. By its powerful FEA, displacements and stresses of the main A-frame components are calculated. For carriage protrusion and cylinder protrusion, firstly 3D solid modeling is done in Pro/Engineer, then local sensitivity analysis of some designing variables is made in Mechanica, then according the analysis result, some variables are selected as the main designing variables and global sensitivity analysis of the main variables. At last, in the condition of selected optimization function and constraints, structure optimization analysis is done and displacements and stresses of these components are calculated. According the calculation, some conclusions are reached, and by the hoisting experiment, conclusions are proved reasonable.The research method is provided with engineering practicability and wide applicability. It has some use for reference to the similar large structure in stress calculation and structure improvement. |
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