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本文深入地探讨了回旋振动的机理,研究了船舶推进轴系回旋振动的特点,推导了比较实用的回旋方向的判据。根据在同一截面上互相垂直的二个方向所测得的振动信号的相位谱即可判断各次回旋的方向。通过简化的轴系模型,导出了在正向旋转的激振力作用下生成逆回旋的必要条件。同时证明,轴系在截面互相垂直的两个方向上质量和刚度的耦合不改变生成逆回旋的条件。最后,根据二条船的实测,指出叶频振幅无论是正回旋或逆回旋并不是很大,因此可以谨慎地探讨叶频回旋共振下安全运转的可能性。
In this paper, the mechanism of maneuvering vibration is discussed in depth. The characteristics of maneuvering vibration of ship propulsion shaft are studied, and the more practical criterion of maneuvering direction is deduced. According to the same cross-section perpendicular to the two directions measured by the vibration signal phase spectrum to determine the direction of each round. Through simplified axis model, the necessary conditions for the generation of inverse gyroscope under the excitation force of forward rotation are derived. At the same time, it is proved that the coupling of mass and stiffness in two directions perpendicular to each other in the section of the shaft does not change the conditions of generating reverse gyration. Finally, based on the measurements of two vessels, it is pointed out that the amplitude of the yaw frequency is not very large, either positive or negative. Therefore, the possibility of safe operation under the leaf-roll cyclotron resonance can be carefully studied.