PIND试验可以改变的试验条件有冲击加速度、振动加速度、振动时间和试验次数。
Shock acceleration, vibration acceleration vibration time and test time are the changed condition in PIND test.
振动加速度峰值受轮轴荷载的影响较大，基本上呈线性增加趋势；而列车长度对振动加速度的影响较小。
The effects on the ground vibration by the factors such as the length, the load and the speed of the train are analyzed.
径向(X向和Z向)振动加速度分量对转速敏感，而轴向(Y向)振动加速度分量则不敏感。
Radial (x direction and Z direction) vibration acceleration components are sensitive to the rotational speed, while axial (Y direction) vibration acceleration component is insensitive.
径向(X向和Z向)振动加速度分量对转速敏感，而轴向(Y向)振动加速度分量则不敏感。
Radial (x direction and Z direction) vibration acceleration components are sensitive to the rotational speed, while axial (Y direction) vibration acceleration component is insensitive.
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