论文部分内容阅读
目的:探究错距旋压仿真模型关键特性参数影响,改进建模方法,克服现有模型方案的缺陷,构建更准确、可靠和稳定的错距旋压有限元仿真模型。创新点:1.提供包括全模型、六面体离散、速度边界、全仿真、双精度和无干涉模型等在内的改进有限元模型构建方法;2.基于所构建的改进模型,完善错距值对成型过程影响的现有结论。方法:1.通过能量、网格独立性和过程参数分析,验证改进有限元模型的可行性和可靠性;2.通过对比仿真和数据分析,获得边界模式、精度模式、时间截断和错距干涉对仿真结果的影响;3.通过仿真模拟,完善现有受干涉、单精度、时间截断和位移边界影响的错距值研究成果。结论:1.速度边界模式较之位移边界模式具有更高的计算精度和效率;2.时间截断不能确保获取稳态结果,不利于计算的准确性和稳定性;3.截断误差对错距旋压成型结果影响显著,计算过程中应采用双精度模式;4.错距干涉严重干扰计算的正确性和可靠性,应在实验设计阶段予以排除;5.针对现有错距值研究受干涉、单精度、时间截断和位移边界影响的现状,基于改进模型,完善错距影响结论(表11)。
OBJECTIVE: To investigate the influence of the key characteristic parameters of the staggered spinning simulation model, to improve the modeling method and to overcome the shortcomings of the existing model schemes, and to build a more accurate, reliable and stable mathematical model of the spinning offset finite element model. Innovative points: 1.Provide the improved finite element model construction method including full model, hexahedral discrete, velocity boundary, full simulation, double precision and non-interference model, etc .; 2 based on the improved model, improve the wrong value pairs The existing conclusions about the impact of the molding process. Methods: 1. Through the analysis of energy, grid independence and process parameters, the feasibility and reliability of the improved finite element model are verified; 2. By contrast simulation and data analysis, the boundary mode, accuracy mode, time truncation, On the simulation results; 3 through simulation, improve the existing interference, single precision, time truncation and the impact of displacement boundary value of the research results. Conclusion: 1. The velocity boundary model has higher accuracy and efficiency than the displacement boundary model.2. The time truncation can not ensure the steady state results, which is not conducive to the accuracy and stability of the calculation.3. 4. The correctness and reliability of the calculation of the interfering interference should be eliminated in the experimental design stage. 5.According to the existing research on the interference value, Single-precision, time-truncated and displacement boundary effects are based on the improved model to improve the effect of the offset (Table 11).