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。
A theoretical method of the PSD of random excitation force in Wheec-rail system is advanced on the principle of mechanical impedance.
用波数-频率谱传递函数表征包括弹性板和流体负荷在内的整个系统的特性，导出了噪声场互谱函数的一般表示式。
Using the wavenumber frequency transfer function to describe the whole system consisting of the plate and the liquid loading, a general expression of the cross spectrum was derived.
借助于向量李雅谱诺夫函数，通过建立一个新的比较结果，研究了具有固定时刻脉冲的控制系统的实际稳定性。
Utilizing piecewise continuous vector Lyapunov function, the practical stabilization of control systems with fixed moments of impulse effects by establishing a new comparison result is considered.
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