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考虑了一个带有非线性弹性支承的偏置圆盘Jeffcott转子系统,研究了常数机动载荷对该系统振动特性的影响.通过数值计算发现:常数机动载荷取不同值时,系统的幅频特性曲线可能出现滞后区变窄、消失以及二次跳跃现象;频率比不同值时,系统振幅与常数机动载荷关系曲线差别较大,在特定转速下,先将常数机动载荷缓慢增加至一定值,再缓慢降低至零,可能引起系统由小振幅稳态解跳跃至大振幅稳态解而无法恢复;转子轴心偏移量随着常数机动载荷增加而增大,受系统工作转速影响不大.
Considering a Jeffcott rotor system with a nonlinear elastic bearing, the influence of constant maneuvering load on the vibration characteristics of the system is investigated. The numerical results show that when the constant maneuver load takes different values, the amplitude-frequency characteristic curve The hysteresis region may appear narrowing, disappearing and secondary jump phenomenon; when the frequency is different from the value, the relationship between the system amplitude and the constant maneuver load is quite different. At a specific speed, firstly, the constant maneuver load is slowly increased to a certain value, The decrease to zero may cause the system to jump from a small amplitude steady state solution to a large amplitude steady state solution and can not be recovered. The rotor axial offset increases with the increase of the constant maneuver load and is not significantly affected by the system operating speed.