| Based on Monte Carlo method, this article took an aero-engine as an example,conducted some simulations on the high pressure rotor systems assembly and finally optimized "straight-build" assembly. Firstly, the "straight-build" assembly approach was introduced on theoretical level, as well as how to optimize the eccentricity of overall assembly components. Using "transfer matrix" model to calculate different level components’ eccentricity. Then, the actual assembly process of a specific aero-engine high pressure rotor system was studied. It described the actual assembly process, pointed out the commonly problems happened during the assembly process,such as the beating measurement, the connection between the high-pressure turbine disk and the high-pressure turbine bearing, and finally gave the appropriate solution.Finally, using Monte Carlo simulation method to study the assembling of the same components and the assembling of different components. For the same components’ assembly, the result of different assembly guidelines was studied on the basis of "straight-build assembly" method. By comparing the eccentricity mean,the variance and the histogram of the component which are obtained according to different criteria, the optimal assembly method was obtained under different circumstances. Then the assembly between different components was researched based on components’ real size of a specific aero-engine high pressure rotor system and the result of the same components assembly. In addition to the existing assembly guidelines, the assembly order of components was changed, then several assembly methods were created. The optimal assembly method was obtained under different circumstance by comparing the eccentricity mean,the variance and the histogram of the component assembly of different assembly method.The research results show that assembly guideline proposed for the "straight-build" assembly optimization can improve the assembly achievement. |
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