基于ANSYS平台的多支撑空间单管路避振优化

Optimization of Spatial Single Pipeline with Multi-supports for Vibration Avoidance Based on ANSYS Platform

为了合理地确定航空发动机中卡箍的布局,以有效避开发动机转子的激振频率,进而大幅度降低管路系统的振动水平,基于ANSYS平台,针对多卡箍支撑的空间管路开展卡箍布局优化研究。描述了空间管路的有限元建模过程,将卡箍的位置作为设计变量,卡箍的可移动范围作为约束条件,以管路系统最大第1阶固有频率作为目标函数,建立了空间管路避振优化模型,并给出了先执行灵敏度分析再进行优化求解的方法。结果表明:基于灵敏度分析减少了设计变量的数量后,其优化结果与考虑所有设计变量的优化结果基本一致;优化后管路系统第1阶固有频率增大,避开了所设定的激振频率。通过试验校验了所创建的有限元模型的合理性,并在此基础上进行了卡箍布局优化实践。

To rationally determine the layout of aeroengine pipeline clamps,effectively avoid the excitation frequencies of the engine rotor,and thereby greatly reduced the vibration level of pipeline system,based on the ANSYS platform,the optimization study of clamps layout to avoid vibration was carried out for the spatial pipeline supported by multiple clamps.The finite element modeling process of the spatial pipeline was described.The location of the clamps was taken as the design variable,the movable range of the clamps as the con⁃straint,and the maximum first-order natural frequency of the pipeline system as the objective function.The optimization model for vibra⁃tion avoidance of the spatial pipeline was established,and the method of performing sensitivity analysis first and then optimization was giv⁃en.The results show that after reducing the number of design variables based on sensitivity analysis,the optimization results are basically consistent with those that consider all design variables.After the optimization,the first-order natural frequency of the pipeline system was increased,and the preset excitation frequencies were avoided.The rationality of the finite element model was verified by bench test,and on this basis,the practice of optimizing the clamps layout was carried out.