带挤压油膜阻尼器双盘转子的参数变化对系统响应的影响

研究了涡轴发动机模拟低压转子的动力学响应随系统参数的变化.首先基于涡轴发动机模拟低压转子,建立了弹性支承一两端带挤压油膜阻尼器的双盘转子动力学模型,推导了其运动微分方程.对于这个12维的动力学方程组,采用数值方法进行了求解.研究了转速、两盘偏心及其相位角、两盘质量比等对系统响应的影响.由计算结果可以看出,中间盘和外伸盘的相位差为π时,两个盘的振动响应都达到最小,而当两个盘的偏心相位相同时,其振动响应最大.中间盘的质量越大,两个盘的响应会越大;而当中间盘比外伸盘质量小很多时,系统的振动响应会降低.

Response of two-disk rotor with squeeze film dampers and its variation with parameters

This paper investigated the variation of dynamical response of a low pressure rotor in turboshaft engine with its system parameters. Based on the model of low pressure rotor, a dynamical simplified model of two-disk rotor with squeeze film damper at each end was built. Its motion equations were derived. The numerical method was applied to solve the 12-dimensions differential equations. The influence of some parameters, e. G. , rotating speed, eccentricity and its phase angle, mass ratio of two disks, were analyzed. From simulation results, it can be seen that when phase difference of two disks' eccentricity is π, the two disks have their minimum vibration amplitude respectively. When their phase is identical, their vibration responses reach maximum values. The larger the mass of mid-span disk is, the larger the vibrations of two disks are. When mass of mid-span is lesser than that of o-verhung rotor, the response of system will decrease.