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针对转静子碰摩的典型力学特征,从碰摩对转子产生附加约束的角度提出了碰摩力学模型,基于该约束模型,分析了转子系统碰摩过程中的共振区间扩展、振幅跃迁与不稳定接触等响应特征与机理.研究了力学特征参数对转子碰摩振动响应的影响,结果表明附加约束刚度提升使得系统共振区间与不稳定接触区间增大,而转静子间摩擦系数升高造成系统共振区间减小与振动响应幅值的降低.建立了具有航空发动机结构特征的碰摩分析模型,仿真结果表明,除碰摩约束造成的共振区间扩展外,具有结构特征的转子碰摩响应还与碰摩位置及模态振型密切相关.碰摩程度较轻时,转子瞬态响应表现出拟周期振动的特点,而碰摩程度严重时,转子运动趋向不稳定,响应特征更接近约束模型.
Aiming at the typical mechanical characteristics of rub-impact, this paper presents a rub-impact mechanical model from the point of view of the additional constraint of rubbing on the rotor. Based on this constraint model, the resonance range expansion, amplitude transition and instability are analyzed Contact and other response characteristics and mechanism.The results show that the increase of additional restraint stiffness makes the system resonance range and unstable contact interval increase, and the increase of the friction coefficient between the trans-stator causes the system resonance Interval reduction and vibration response amplitude reduction.A model of aero-engine rub-impact analysis is established, and the simulation results show that except for the expansion of the resonance range caused by the rub-impact constraint, the rub-impact response of the rotor with structural characteristics is also related to the collision The frictional position and mode shape are closely related to each other. When the degree of rubbing is mild, the transient response of the rotor shows the characteristics of quasi-periodic vibration. When the degree of rubbing is severe, the rotor motion tends to be unstable and the response characteristics are closer to the constraint model.