转子越过临界转速的振动特性试验研究

EXPERIMENTAL STUDY OF VIBRATION CHARACTERISTIC OF ROTOR PASSING THROUGH CRITICAL SPEED

关键词:  转子速度  加速度  临界转速  模态振动试验

Key words:  Rotor speed  Acceleration  Critical velocity  Modal vibration test

摘要:

以盘偏置单盘双简支试验器转子为对象，由加速与减速的幅频特性曲线确定转子的临界转速。以幅频特性曲线模态计算法确定盘处的偏心距和阻尼比，用弯、扭耦合传递矩阵法计算临界转速及稳态不平衡响应，同时分析了偏心距及初始弯曲按一阶振型分配时，转子越过临界之振动特性。由试验与理论分析结果表明，加速度对振动特性有明显的影响。

Abstract:

For a single disc double point support testing rotor with offset disc,the critical speed was obtained by characteristic curve of acceleration and deceleration amplitude frenquency,the offset centre distance and damping ratio of disc was computed by using the modal computer method of amplitude frenquency characteristic curve and the transfer matrixes of lateral/torsional coupling was used to calculate critical speed and static unbalance response.The aim of experimental study is to analyse acceleration effect on vibration characteristic and to analyse vibration characteristic of rotor passing through critical speed while offset centre distance and initial twisting are allocated according to one order mode of vibration