The Morton effect (ME) is a thermally induced rotodynamic instability problem frequently reported in the fluid film bearing system. The temperature difference across the journal circumference may cause large spiral, synchronous vibration. Earlier ME modeling approaches rarely focus on the flexure-pivot bearing (FPB), significantly disproportionate to its wide application. Hereby, the transient ME prediction algorithm is proposed based on a high-fidelity thermo-elasto-hydrodynamic FPB model. A hybrid finite element analysis is adopted to evaluate the entire rotor thermal bow profile including the rotor midspan. The algorithm is benchmarked with experiments and applied to a realistic compressor model. Simulations confirm the proneness of the FPB system to the ME instability, and reveal the ME sensitivity to the bearing-rotor configuration and operation conditions.

莫顿效应 (ME) 是流体薄膜轴承系统中经常报告的热致转子动力不稳定问题。轴颈圆周的温差可能会导致较大的螺旋同步振动。早期的 ME 建模方法很少关注挠性枢轴轴承 (FPB)，与它的广泛应用明显不成比例。因此，提出了基于高保真热弹性流体动力学FPB模型的瞬态ME预测算法。采用混合有限元分析来评估包括转子中跨在内的整个转子热弓剖面。该算法以实验为基准，并应用于现实的压缩机模型。模拟证实了 FPB 系统对 ME 不稳定性的倾向，