通过测振实验能够获得振动曲线 ,对振动曲线拟合可确定振系的有关参数。本文应用优化方法中的复合形法 ,对测得的某型坦克火炮起落部分振动曲线进行拟合。该方法允许参数初值选择范围宽 ,并能保证在边界范围内收敛 ,算法简单、可靠 ,收敛速度快。能够在微机上实现多自由度振系的振动曲线拟合 Vibration curves can be obtained through the vibration experiment, and the relevant parameters of the vibration system can be determined by fitting the vibration curves. In this paper, the complex shape method in the optimization method is used to fit the measured vibration curve of the landing part of a certain tank gun. The method allows a wide selection of initial parameters and ensures convergence within the bounds of the boundary. The algorithm is simple and reliable, and converges fast. Vibration curve fitting of multi-degree-of-freedom vibration system can be realized on the computer