拉杆失谐模型及其对端面弧齿应力分布的影响

Analysis of bolt preload mistuned model and its impact on stress distribution of curvic couplings

为了深入了解拉杆失谐对端面弧齿应力分布的影响,建立拉杆转子失谐刚度模型,研究拉杆失谐对转子动力学特性的影响,并将转子的动态响应曲线代入端面弧齿有限元分析模型,分析拉杆失谐对端面弧齿应力分布的影响.研究结果表明:正失谐拉杆位于轴心轨迹椭圆长轴位置,负失谐拉杆位于轴心轨迹椭圆短轴位置时可以减小转子各向异性;负失谐拉杆处于动态弯曲时的受压侧,可减小各齿应力差;而处于受拉侧时,则会进一步增大各齿应力差;正失谐情况则相反.

The mistuned stiffness model of bolted rotor with curvic couplings was established,and the effect of bolt preload mistuning on dynamic characteristics of the rotor was studied.At last,the dynamic response of the rotor was applied to finite element model as displacement boundary conditions to analyze the dynamic stress distribution under the condition of dynamic bending,and the influence of bolt mistuning on stress distribution of curvic couplings was obtained.The results show that the stiffness anisotropy of the rotor can be reduced when positive mistuning bolt lies on the major axis of the running orbit,or negative mistuning bolt lies on the minor axis.The stress variation of each tooth can be reduced if negative mistuning bolt is on the compression side,and it will be further increased if negative mistuning bolt is on the tensile side when dynamic bending happens,whereas the stress change tendency of curvic teeth is opposite under the positive mistuning condition.