为揭示多叶波箔型动压气体轴承流固耦合机理，建立了该型轴承转静多楔形通道内剪切流动与箔片组合弹性变形的耦合分析方法，数值研究了转静间隙气膜非定常流场参数分布及箔片组合弹性变形响应。研究结果证实了多叶波箔型动压气体轴承存在强烈的流弹耦合效应。对于流体域，转静间隙气膜呈现出多个离散的高/低压区，高压区位于最小间隙上游通道收敛处而低压区则位于相邻箔片连接形成突扩台阶处；最小间隙上游高压区流动通道局部扩张诱导了流动分离，增加了剪切流动不稳定性；流弹耦合削弱了气膜高压区脉动而强化了低压区压力脉动。对于固体域，1号/2号弹性箔片向轴承套方向变形，而4号/5号弹性箔片则向转轴方向变形，这与转静气膜高压区和低压区分布相对应；最大间隙下游转静间隙气膜低压区诱导了顶箔与其相邻搭接箔片分离；弹性箔片变形与压力脉动存在相位延迟。获得了转速、偏心率、间隙尺度和弹性箔片刚度对轴承流弹耦合性能的影响规律；转静间隙气膜压力与转速和偏心率呈正相关而与间隙尺度呈现反相关；间隙尺度的减少带来了低压区压力峰值绝对值的降低；弹性箔片杨氏模量较小时，流弹耦合效应更加强烈。流固耦合下，顶箔振动相较于压力脉动存在滞后性，流体域高压区域箔片振动和气膜压力脉动幅度均大于流体域低压区域，可为机载多叶波箔型动压气体设计提供理论基础和技术指导。

To reveal the fluid structure coupling mechanism of multi-leaf wavy foil type dynamic pressure gas bearings， a coupling analysis method was established for the shear flow and elastic foil combination deformation in the rotating-static multi-wedge channel of this type of bearing. The parameter distribution of the unsteady flow field of the rotating-static gap gas film and the unsteady deformation of the elastic foil combination were numerically studied. The research results confirm that there was a strong aero-elastic coupling effect in dynamic pressure gas bearings of the multi-leaf wave foil type. When multiple wedge-shaped channels were coupled with eccentricity， different elastic foils correspond to multiple discrete high/low pressure zones in the gas film. The high pressure zone was located in the convergence area of the channel， while the low pressure zone was located at the sudden expansion step connected to adjacent foils. The local expansion of flow channels in the high-pressure zone induced flow separation and increases shear flow instability. The fluid-elastic coupling weakened the pulsation amplitude in the high-pressure region of the gas film， and strengthened the pressure pulsation amplitude in the low-pressure region. The 1st and 2nd elastic foils deformed in the direction of the bearing sleeve， while the 4th and 5th elastic foils deformed in the direction of the rotating shaft， which corresponds to the distribution of the high-pressure and low-pressure areas of the rotating-static air film. The low-pressure zone of the static gas film induced separation between the top foil and its adjacent overlapping foil. The influence of rotational speed， eccentricity， clearance scale， and elastic foil stiffness on the fluid-elastic coupling performance of bearings was obtained. The gas film pressure in the fluid domain is positively correlated with the bearing capacity， speed， and eccentricity， while negatively correlated with the clearance scale. High rotational speed and large eccentricity induced an increase in the peak value of the low-pressure region in the gas film. In aero-elastic coupling， there was a certain lag in the vibration frequency of the top foil compared to pressure pulsation.And the amplitude of foil vibration and gas film pressure pulsation in the high-pressure region of the fluid domain were greater than that in the low-pressure region of the fluid domain. The results in this study provide theoretical basis and technical quidance for the design of airborne multi-leaf wave foil dynamic pressure gas.