Numerical simulation analysis of dynamic characteristics of double-span rotor system with slowly varying mass
LUO Yuegang1,2, FU Hao1,2, ZHANG Yue1,2, JIA Haifeng1,2, HUANG Fengchao1,2
1.College of Mechanical and Electronic Engineering, Dalian Minzu University, Dalian 116600, China;
2.Key Laboratory of Intelligent Perception and Advanced Control of State Ethnic Affairs Commission, Dalian Minzu University, Dalian 116600, China
Abstract：Here, based on the finite element method (FEM), a dynamic model of a double-span rotor system with slowly varying mass was established. By using Newmark-β numerical integration method, vibration characteristics of the double-span rotor system with slowly varying mass under conditions of different rotating speeds, different slowly varying parameters and different slowly varying positions were analyzed with shaft center trajectory diagram, Poincaré section one, time domain waveform one, frequency spectrum one and 3-D waterfall one. The results showed that when there is a slowly-varying mass in the system, a slowly-varying small frequency division Fr appears at ε times of working frequency, and equidistant frequency divisions with frequency interval of ε•Fn appear on both sides of working frequency and on the right side of Fr; the mass variation amplitude coefficient λ mainly affects vibration amplitude of the rotor system, when λ gradually increases, the amplitude of each frequency component of the system increases, and the system becomes more and more unstable; the slowly-varying time coefficient ε mainly affects the periodicity of the rotor system, when ε changes, multiple and period length of the system periodic motion change significantly; when both two disks of a double-span and dual-disk rotor system have slowly-varying mass, the periodic motion and frequency division components of the system are composed of the superposition of the two disks’, and phenomena near high rotating speed region become more obvious; the study results can provide a theoretical reference for studying dynamics and fault recognition of rotor systems with slowly varying mass in the future.
罗跃纲，付豪，张悦，贾海峰，黄逢超. 双跨质量慢变转子系统动态特性数值仿真分析[J]. 振动与冲击, 2021, 40(15): 284-289.
LUO Yuegang, FU Hao, ZHANG Yue, JIA Haifeng, HUANG Fengchao. Numerical simulation analysis of dynamic characteristics of double-span rotor system with slowly varying mass. JOURNAL OF VIBRATION AND SHOCK, 2021, 40(15): 284-289.
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