基于ANSYS的转子支座静刚度计算方法及实验验证

Calculation Method on Static Stiffness of Rotor-supports Based on ANSYS and Experimental Verification

针对旋转机械常用的刚性支座、鼠笼弹性支座,利用ANSYS建立了支座静刚度计算模型。利用螺纹杠杆原理设计了可产生10 kN拉力的支座施力机构,开展了多种支座静刚度测量实验。实验结果表明:有限元计算的静刚度最大误差为8.3%,验证了支座静刚度模型的正确性;刚性支座水平径向和垂向静刚度数值差异很大,刚度表现出很强的各向异性;鼠笼弹性支座径向静刚度差异很小,刚度表现为各向同性。静刚度有限元计算模型中正确的载荷类型为余弦面载荷分布。边界约束条件为:针对刚性支座,在支座底板螺栓孔周围施加全约束,在底板其他区域则给予轴向约束;对于鼠笼弹性支座,在鼠笼弹性结构与刚性支座联接面上施加全约束。

The computing method on static stiffness of the rigid rotor-support,the squirrel-cage elastic rotor-support extensively applied into universal rotor machinery.A force application mechanism was designed on thread lever principle which could produced at least 10 kN tension,and the static stiffness experiments were carried out.The experimental results show the maximum error of static stiffness obtained through ANSYS is 8.3%,and the results verify the simulation models on static stiffness of rotor-supports are correct.For the rigid rotor-support the static stiffness on the radial horizontal direction and radial vertical direction has much difference and so presents distinctly anisotropy.For the squirrel-cage elastic rotor-support the stiffness on the radial direction has little difference and so presents isotropy.Correct load on the element model is cosine surface distribution.For the rigid rotor-support the constraint boundary conditions are full constraint near the bolt hole on the base plate and axial constraint on the rest area.For the squirrel-cage elastic rotor-support the constraint boundary conditions are full constraint on the joint plane with the rigid support.