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三、动态特性和失稳转速轴承的动态特性系数通常指油膜的弹性(刚度)和阻尼性能。一个弹簧当受到W力[kgf]压缩了α[cm],则其刚度系数为k=W/α[kgf]。对于轴承的油膜来说,情况就不是这样简单了。设轴颈中心的平衡位置为O_(10),并取座标轴xy如图8。如使轴心从O_(10)沿X向偏离ΔX到O_1(图8a),则附加的油膜力不仅沿垂直方向向上,而且还有一个水平分量。这一个水平分量在小偏心率时是向右的。这一点可以这样来理解,当载荷很轻时,轴颈中心O_(10)几乎与轴承中心O_B重合。当轴心由O_(10)向下偏离到O_1时,轴承间隙中左半部分(图中划阴影部分)具有收敛形(相对于转速)。而轴承
Third, the dynamic characteristics and speed instability Bearing dynamic characteristics of the coefficient usually refers to the oil film stiffness (stiffness) and damping performance. When a spring is compressed by α [cm] by W force [kgf], its spring constant is k = W / α [kgf]. For the bearing oil film, the situation is not so simple. The journal center balance position O_ (10), and take the coordinate axis xy Figure 8. If the axis deviates from ΔX to O_1 in the X direction from O_ (10) (Fig. 8a), the additional oil film force is not only upward in the vertical direction but also has a horizontal component. This horizontal component is rightward at small eccentricities. This can be understood in this way, when the load is light, journal center O_ (10) almost coincides with the bearing center O_B. When the axis deviates downward from O_ (10) to O_1, the left half of the bearing clearance (hatched portion in the drawing) has a convergent shape (relative to the rotational speed). And bearings