基于PCE法的某涡轮泵转子动力学特性不确定性分析  

Uncertainty Analysis of Dynamic Characteristics of Turbine Pump Rotor Based on PCE Method

作　　者：沙粒子 王晓伟[1] 穆鹏刚 SHA Lizi;WANG Xiaowei;MU Penggang(School of Energy and Power,Nanjing University of Aeronautics and Astronautics,Nanjing 210016,China;National Key Laboratory of Science and Technology on Liquid Rocket Engines,Xi’an 710100,China)

机构地区：[1]南京航空航天大学能源与动力学院,江苏南京210016 [2]液体火箭发动机技术国防科技重点实验室,陕西西安710100

出　　处：《机械制造与自动化》2020年第3期116-118,共3页Machine Building & Automation

摘　　要：为解决某火箭发动机涡轮泵转子动力学建模中存在的参数不确定性问题,采用PCE法对连接刚度的不确定性问题进行研究。建立转子系统的有限元模型,与确定的模态试验结果进行对比,前两阶的模态频率误差不超过4%。采用PCE法建立局部连接刚度含不确定性参数的动力学模型,研究连接刚度为服从高斯分布的随机变量时引起的转子动力学特性的不确定性。将结果与基准解进行对比分析,验证了该方法的有效性。To solve the parameter uncertainty problem existing in the dynamic modeling of a turbocharger rotor of a rocket engine,PCE method is used to research on the uncertainty of joint stiffness.Than,the finite element model of the rotor system is established.The established finite element model is compared with the determined modal test results.The modal frequency error of the first two orders does not exceed 4%.Based on this,the PCE method is used to establish the dynamic model of the local connection stiffness with uncertain parameters.In this paper,the uncertainty of the rotor dynamics caused by the Gaussian distribution variable obeyed by the joint stiffness is studied.The results are compared with the benchmark solution,which is used to verify the effectiveness of this method.

关 键 词：火箭发动机 涡轮泵转子 有限元建模 不确定性 多项式混沌展开 

分 类 号：TK49[动力工程及工程热物理—动力机械及工程]