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货车侧向不稳度与车体在其弹簧上的自振频率有关。任何一侧的簧上质量如果忽然施加到另一侧,然后放松,车体将出现摆动,此时它具有自振频率。其摆动时的当量摆长(弹簧上重心的高度)决定于自振频率和重心高,对散装货车的空车与重车来说,因其重心高不同,因而有明显不同值的当量摆长。对于90吨漏斗车的重车来说,重心高度使车辆自振频率为0.5周/秒。当这种车体振动的自振频率与周期激扰力相耦合并形成人所共知的共振时,摆动振幅可以变得非常大。货车这种激扰力是由于通过11.9米长的钢轨接头时不连续地有规律地产生。当列车
The lateral instability of the truck is related to the natural frequency of the car body on its spring. If any side of the sprung mass suddenly applied to the other side, and then relax, the body will swing, then it has natural frequency. When swinging, the equivalent swing length (the height of the center of gravity of the spring) depends on the natural frequency and the center of gravity. For empty trucks and heavy trucks of bulk trucks, because of their different center of gravity, there are significant different values of equivalent swing length . For a heavy-duty truck with a 90-ton funnel, the center of gravity height gives the car a natural frequency of 0.5 weeks / second. When the natural frequency of this body vibration is coupled with the periodic perturbation force and forms a well-known resonance, the oscillation amplitude can become very large. This disturbing force of the truck is caused by the discontinuities that occur regularly through the 11.9-meter-long rail joints. When the train