自动门
自动门:结构图的等效变换和简化
发布时间:2014/5/8
自动门讯:
结构图的等效变换和简化
    由控制系统的结构图通过等效变换(或简化)可以方便地求取闭环系统的传递函数或
系统输出量的响应。实际上,这个过程对应于由元部件运动方程消去中间变量求取系统传
递函数的过程。
    一个复杂的系统结构图,其方框间的连接必然是错综复杂的,但方框间的基本连接方
式只有串联,并联和反馈连接三种。因此,结构图简化的一般方法是移动引出点或比较点,
交换比较点,进行方框运算将串联、并联和反馈连接的方框合并。在简化过程中应遵循变
换前后变量关系保持等效的原则,具体而言,就是变换前后前向通路中传递函数的乘积应
保持不变,回路中传递函数的乘积应保持不变。
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