开闭裂纹转子在非共振转速区的振动特性分析
发布时间：2019-06-17 11:45
【摘要】：首先建立了含横向开闭裂纹Jeffcott转子的运动方程,在此基础上,利用非线性振动理论的多尺度分析方法,研究了过程中非共振区的开闭裂纹转子振动特性。在模拟试验台上验证了裂纹参数、裂纹方向及不平衡量大小对含裂纹转子振动行为的关系,研究结果表明:在非共振转速区,裂纹转子的动平衡位置、基频均随裂纹深度而变化,裂纹越深影响越大;当不平衡量较小时,可以认为不平衡量与裂纹的相互作用仅对基频分量有影响,对高阶倍频影响很小;不平衡量与裂纹法向的相位角对各阶倍频振幅的影响非常显著,一般都是在0°或180°附近取得极值。
[Abstract]:Firstly, the motion equation of Jeffcott rotor with transverse open and closed cracks is established. On this basis, the vibration characteristics of open and closed cracked rotor in non-resonant region are studied by using the multi-scale analysis method of nonlinear vibration theory. The relationship between crack parameters, crack direction and unbalance on the vibration behavior of cracked rotor is verified on the simulation test-bed. The results show that the dynamic equilibrium position and fundamental frequency of cracked rotor vary with crack depth in the non-resonant speed region, and the deeper the crack is, the greater the influence is. When the unbalance is small, it can be considered that the interaction between unbalance and crack only affects the fundamental frequency component, but has little effect on high-order frequency doubling. The effect of the phase angle between the unbalance and the normal direction of the crack on the frequency doubling amplitude of each order is very significant, and the extreme value is usually obtained near 0 掳or 180 掳.
【作者单位】： 大连民族学院机械系;杭州电子科技大学机械工程学院;
【基金】：中央高校基本科研业务费专项资金项目:切削加工过程中颤振的诊断与识别方法研究(DC201502010305)
【分类号】：TH113.1
[Abstract]:Firstly, the motion equation of Jeffcott rotor with transverse open and closed cracks is established. On this basis, the vibration characteristics of open and closed cracked rotor in non-resonant region are studied by using the multi-scale analysis method of nonlinear vibration theory. The relationship between crack parameters, crack direction and unbalance on the vibration behavior of cracked rotor is verified on the simulation test-bed. The results show that the dynamic equilibrium position and fundamental frequency of cracked rotor vary with crack depth in the non-resonant speed region, and the deeper the crack is, the greater the influence is. When the unbalance is small, it can be considered that the interaction between unbalance and crack only affects the fundamental frequency component, but has little effect on high-order frequency doubling. The effect of the phase angle between the unbalance and the normal direction of the crack on the frequency doubling amplitude of each order is very significant, and the extreme value is usually obtained near 0 掳or 180 掳.
【作者单位】： 大连民族学院机械系;杭州电子科技大学机械工程学院;
【基金】：中央高校基本科研业务费专项资金项目:切削加工过程中颤振的诊断与识别方法研究(DC201502010305)
【分类号】：TH113.1
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