带有ERSFD的航空弧齿锥齿轮动态特性

Dynamic characteristic of aviation spiral bevel gear with ERSFD

将弹性环式挤压油膜阻尼器(ERSFD)引入弧齿锥齿轮传动(SBGD)系统中以改善其动态特性。基于广义雷诺方程建立内外油膜控制方程,并通过半解析方法得到弹性环的变形,获得ERSFD油膜力后基于径向基(RBF)神经网络建立其近似模型,建立带有ERSFD支撑的8自由度SBGD系统双向流固耦合动力学模型,借助分时迭代方法获得系统稳态响应。结果表明:内油膜压力沿圆周分段式分布,且沿偏移线为非对称分布;ERSFD的存在有效削弱了油膜力与偏心率之间的非线性关系;弹性环凸台厚度的增加,使系统振动响应的幅值整体下降,并抑制了5 200~8 200 r/min转速范围内系统的混沌行为,有效改善了SBGD系统动态特性。

Elastic ring squeeze film damper(ERSFD)was introduced into the spiral bevel gear drive(SBGD)to improve its dynamic characteristics.Based on the generalized Reynolds equation,the internal and external oil film control equations were established.The deformation of the elastic ring was obtained by semi-analytical method.After obtaining the ERSFD oil film force,an approximate model was established based on the radial basis function(RBF)neural network.A bidirectional fluid-structure interaction dynamic model of an 8 degree of freedom spiral bevel gear transmission system with ERSFD support was established.The steady-state response of the system was obtained by the block interation method.The results showed that the inner oil film pressure was distributed in segments along the circumference and asymmetrically distributed along the offset line.The existence of ERSFD effectively weakened the nonlinear relationship between oil film force and eccentricity.The increasing thickness of the elastic ring boss reduced the amplitude of the vibration response of the system,suppressed the chaotic behavior of the system within the speed range of 5200−8200 r/min,and effectively improved the dynamic characteristics of the spiral bevel gear transmission system.