A theoretical method of the PSD of random excitation force in Wheec-rail system is advanced on the principle of mechanical impedance.
采用机械阻抗原理，给出了轮轨系统随机激振力功率谱密度函数的理论计算方法。
This paper presents a formula of the pressure of liguid film in the critical state of the unbroken liguid on the principle of hydromechanics, and discusses a design method of spring force.
该文利用流体力学的原理，建立流体膜临界连续状态的液膜压力公式，在此基础上，探讨了弹簧力的设计方法。
This paper proposes hydraulic compensation principle to solve surplus force by synchro-reverse method on the base of loading principle studied.
本文在研究加载原理基础上，提出用同步反向法进行液压补偿的原理，来解决多余力问题。
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