摘要
某燃气轮机高压涡轮是一个带有24个轮盘的分布质量转子系统,具有不对称的支承特征。文中首先采用集中质量和无质量弹性轴段进行建模,根据设计要求引入两个各向异性弹性支承,构建具有25个轴段的集总质量转子系统动力学模型。给出了用Riccati传递矩阵法计算该转子系统复频率的算法,计算得到各阶临界转速。利用对数减幅率判据对转子系统的稳定性进行判定,讨论了转速等因素对各阶模态下转子系统稳定性的影响。所得结果为该复杂转子系统的动力学设计提供了依据。
The high pressured turbo of gas turbine is a distributed mass rotor system accompanied with 24 wheel discs and has unsymmetrical supporting characters. The modeling has been carried through in this paper by adopting the concentrated mass and mass-less elastic shaft segments. Two anisotropic elastic supports were introduced according to the requirements of design to establish the dynamics model of the overall mass rotor system that possessing a collection of 25 segments of shaft. The algorithm for computing the complex frequency of this rotor system by the Riccati transference matrix method was presented to obtain each ordered critical rotating speed by calculation. Utilizing logarithmic criterion of damping rate to carrying through judgement on the stability of rotor system; and the influence of factors of rotation speed etc. on the stability of rotor system under each ordered modality was discussed. The obtained result provided basis for the dynamics design of this complex rotor system.
出处
《机械设计》
CSCD
北大核心
2008年第5期15-17,共3页
Journal of Machine Design
基金
辽宁省科学技术基金资助项目(20044003)
