以某型号车用浮环轴承涡轮增压器为研究对象，根据Alford模型和Black模型计算得到密封结构和叶顶间隙气流激振力，建立了未考虑气流激振力和考虑气流激振力这两种情况下的有限元模型。对两个模型进行仿真计算，得到了涡轮增压器转子系统的临界转速、稳态响应、瞬态响应，并进行了对比分析。结果表明：气流激振力产生了推动转子正向涡动的切向力，导致转子系统振幅增大，降低了转子的稳定性；气流激振力使转子产生的涡动随着转速的增大而增大，且叶顶间隙气流激振力对转子系统的稳定性影响较大。

Using the vehicle turbocharger with a floating ring bearing as the research object, the airflow exciting forces of sealing structure and blade tip clearance were calculated according to Alford and Black model. The finite element models considering and without considering airflow exciting forces were built. Then the critical speed, steady response and transient response of turbocharger rotor system were acquired and were analyzed through the comparison between them. The results show that the airflow exciting forces lead to the tangential force of rotor forward vortex so that the amplitude of rotor vibration becomes large and the stability of rotor becomes poor. In addition, the magnitude of rotor vortex increases with the increase of speed. The airflow exciting force of blade tip clearance has a great influence on the stability of rotor system.