After reduce the bar's free vibration differential equation to a lower order, we analogize it to the bending theory of the beam and gives an iterative procedure.
将杆作自由振动的微分方程作降阶处理后，和梁的弯曲理论作类比，给出了一个迭代算法。
An important inequality is used to establish some criteria for the oscillation of forced difference equation and it is generalized to higher order.
借助一个重要的不等式研究一类带有强迫项的时滞差分方程的振动性，并推广至高阶的情形。
Under the circumstance of the real time monitor for the low-frequency variables, the method of one order difference equation has been proposed. At last, an example of its application is given.
对缓时变物理量的实时监测的情况，采取了一阶差分方程取代的方法。
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