加强盘式转子支承设计技术

针对航空发动机高速转子支承结构设计难点,以某加强盘式结构的高压压气机试验件为研究对象,基于该试验件具有转子跨距长、质量大、轴向力大的设计特点,分析转子支承方案设计要求和转子动力特性影响因素,总结了转子支承设计技术特点和需求条件;开展支承方案的确立及筛选设计,采用通过理论和数值计算分析优选出的1-1-1型支承方案,综合优化支点跨距、转子质量、支承刚度和支点阻尼4个设计变量,满足全转速范围内的性能录取需求。结果表明:优化方案在工作转速范围内存在2阶临界转速并均处于性能录取转速以下,应变能分别为9.3%和16%。试验件最终顺利完成了全部转速下的性能参数录取,在试验过程中运行平稳,整体振动水平较低,轴向力始终处于轴承承载范围,验证了转子支承方案的合理性。

Design Technology of Reinforced Disc Rotor Support

In view of the design problem of structure of aeroengine high-speed rotor support,a test piece of high pressure compressor with reinforced disc structure was taken as the research object.Based on the design characteristics of the test piece with large span,mass and axial force,the design requirements of rotor support scheme and the influencing factors of rotor dynamic characteristics were analyzed,and the technical characteristics and requirement conditions of rotor support design were summarized.The 1-1-1 type support scheme selected by theoretical and numerical calculation analysis was adopted to comprehensively optimize the four design variables(fulcrum span,rotor mass,support stiffness and fulcrum damping),so as to meet the performance acceptance requirements over the full speed range.The results show that there are two-critical speeds over the operation speed range of the optimization scheme,which are all below the performance acceptance speed,and the strain energy is 9.3%and 16%respectively.The test piece finally successfully completes the performance parameters at all speeds.During the test,the operation is stable,the overall vibration level is low,and the axial force is always in the bearing load range,which verifies the rationality of the rotor support scheme.