本文采用了单位脉冲响应函数法识别模态参数，由所建数学模型的特征方程识别结合部的物理参数。
The impulse response method is adopted to identify the modal parameters, and the physical parameters are estimated from the characteristic equation of the mathematical model built.
分析了吊放声纳发现判决方程、各种搜潜方法的共性特征，在此基础上将探测、发现目标的问题逐步转换成易于求解的数学模型。
By discussing the identification equation of submarine searching, and common characteristics of search methods, a simple mathematic searching model for dipping sonar is given.
本文阐述了平面二次包络弧面蜗杆传动的几何特征，引用数学方程对这些特征加以说明，进而提出了啮合参数选择原则。
In this paper, the geometric characteristics of worm drive with double enveloping arc surface machined by datum-plane tool are stated.
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