![](https://csdnimg.cn/release/download_crawler_static/87192830/bg5.jpg)
2.2 两列完全相同的正弦波合成的李萨如图形
在李萨如图形的研究中,两列完全相同的正弦波的合成,往往能得到稳定而
易于分析的图形花样,而且在理论推导上也具有简明的特点,易于我们做理论分
析和实验模拟,在许多版本的力学教材中,也是以两列完全相同的正弦波合成为
例,介绍了李萨如图形的花样,以及根据花样确定频率比,相位差等。下面我们
以此为例,介绍李萨如图形的方程以及推导过程。假定有一质点独立地参与了两
个相互垂直方向上的振动,并且分别满足简谐振动规律。
质点在 x 方向的位移随时间的变化
································································(2-3)
质点在 y 方向的位移随时间的变化
·································································(2-4)
式(2-3)(2-4)展开以后并适当变形得到
··················································(2-5)
·················································(2-6)
得到
·············································(2-
7)