簧下重量 meaning in English

non-suspended weight

There exist two problems for brake rotors made of cast iron : overweight which affects dynamical properties of the train and excessively high temperature on friction surface during braking which deteriorates the mechanical properties of brake rotors
以往采用的铸铁盘存在两大问题:簧下重量大,影响机车车辆的动力学性能;表面温度较高,影响制动盘的机械性能。
So aluminum matrix composite is proper for brake rotors which can greatly reduce the weight of the brake system of train that improves dynamical properties of the train , and significantly lower the surface temperature of the brake rotor that increases safety coefficiency of service of vehicle
采用铝基复合材料制动盘可以大大减轻机车车辆的簧下重量,改善列车的动力学性能,并显著降低制动盘的表面温度,提高机车车辆运行的安全性。