Air spring is characteristic of variable stiffness, its natural vibration frequency is much lower than that of leaf spring and will not change with load of vehicle.
空气弹簧具有变刚度特性，其固有振动频率要比钢板弹簧低得多，且不随汽车承载质量的变化而改变。
Because the diameter of the steel wire forming the spring by winding is changed along the axial direction of the steel wire, the spring can obtain a variable stiffness characteristic curve.
由于卷绕构成弹簧的钢丝的直径沿钢丝的轴向改变，因此弹簧可以获得变刚度的特性曲线。
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