同样采用锯齿接缝设计，不同的接缝宽度对RCS有极大影响，1.15mm降低到0.5mm宽度，RCS整整降低了5分贝；横向台阶高度从1.2mm降低到0.1mm，RCS降低7分贝，而0.1mm比人的指甲还薄许多，这就是歼20战斗机表面看不到蒙皮的凸起，对缝平滑的根本原因。

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/msimage/202403/1c640db3697a29f38d29a6ef6b891da0.png"></p><h2>2.3 B矩阵</h2><p>利用雅克比矩阵可以求得形函数对物理坐标的导数：</p><p><img src="https://img.jishulink.com/msimage/202403/679df85f1a86868e0e4c223703b9f937.png"></p><

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力学进展，&nbsp;2005，&nbsp;35(1): 5-20.

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book_id=A5F00543B8AA1DF7B1DF4BF0A718798E http://touch.m.dangdang.com/book_detail.php?book_id=3ED5FB81E609AA7006CA9E7999E7208A http://touch.m.dangdang.com/book_detail.php?

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</p><p><br></p><p><strong>实操：</strong></p><p>步骤1：打开ADAMS PostProcessor后处理软件，绘制加速度曲线，完成FFT转换；</p><p><span style="color: rgb(25, 27, 31); background-color: rgb(255, 255, 255);">1.1 单击菜单栏：Plot—FFT，按步骤设置</

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该案例主要内容如下：</p><p>（1）如何建立SPH_FEM爆炸模型，</p><p>（2）SPH相关控制关键字如何设置，</p><p>（3）如何实现SPH和FEM之间的耦合，</p><p>（4）如何控制不同药柱的起爆时间，</p><p>（5）如何查看混凝土的损伤参数。

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