设180度根轨迹的渐近线与虚轴有交点，则( )。
A: 当根轨迹增益
时，闭环系统不稳定
B: 当根轨迹增益
时，
即在的某一范围内变化时，闭环系统稳定
C: 一定有开环零点或开环极点位于s平面的右半平面
D: 一定有开环零点或开环极点位于s平面的正实轴上
A: 当根轨迹增益
时，闭环系统不稳定B: 当根轨迹增益
时，即在的某一范围内变化时，闭环系统稳定C: 一定有开环零点或开环极点位于s平面的右半平面
D: 一定有开环零点或开环极点位于s平面的正实轴上
举一反三
- 系统的开环传函为<img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202105/4c0fd44e4fd34ba5abebcf5cf4075e5b.png" />，根轨迹和虚轴的交点及相应的根轨迹增益为（ ）。 A: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202105/1a01ea0a12204b8395a0b5b77f6dff14.png" />，<img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202105/5973aa4feb8b449e936c4db36ba0f235.png" /> B: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202105/3212607aceba42119e02c092ee59c4c9.png" />，<img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202105/5e06d749351c40758f2d90bd5503ac41.png" /> C: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202105/646b41ca995f4f9883b1d2c4a17a1b4c.png" />，<img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202105/f268e2b90534408293cc995f99bf8907.png" /> D: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202105/212d583db0b74c5a84acfc955c422863.png" />，<img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202105/5e06d749351c40758f2d90bd5503ac41.png" />
- 设<img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202105/54986715cd654d919e5c826596feeaea.png" />为系统开环传递函数,取复平面上的任一点s，当（ ）情况下，s为系统180度根轨迹上的点。 A: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202105/07552f7e441941c7b44f88ba5d438968.png" /> B: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202105/5c329e39955e4876ad35b10e470b2aca.png" /> C: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202105/dbe82017a7294e8095ea34098760c789.png" /> D: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202105/ac8c0cbd33364bdbb9ae8309512dd429.png" />
- 考虑AR(2)模型<img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202105/9c19d336a086430cab947cf3a40c8047.png" />,则AR特征方程的根为（ ）。 A: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202105/b8d42e894377426eaca4f3a382c0569c.png" /> B: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202105/cb2410db797c4dc5870eb9ab1dfae59e.png" /> C: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202105/505155f9e5654d3294291a0f104fd54f.png" /> D: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202105/ff900163e913414384b61dbd55a0c36e.png" />
- 下图所示信号流图的系统函数H(s)为（ ）。 A: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202105/604e89d38c214db9888de2246d102c7d.png" /> B: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202105/2c4320180d5d4f3f95463260a6586a1a.png" /><img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202105/42cd36c1dd634c79abcf9dfb185d3cbf.png" /> C: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202105/477a9f5c243046079c5500071f3d0414.png" /> D: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202105/9724865a860b4e7ba0b91e26c6ccf48d.png" />
- 设180度根轨迹的渐近线与虚轴有交点，则( )。 未知类型：{'options': ['当根轨迹增益[img=260x84]17d62429b5e1d85.png[/img]时，闭环系统不稳定', '当根轨迹增益[img=292x84]17d62429c92c5d3.png[/img]时，[img=78x84]17d62429e02bdd1.png[/img]即在的某一范围内变化时，闭环系统稳定', '一定有开环零点或开环极点位于s平面的右半平面', '一定有开环零点或开环极点位于s平面的正实轴上'], 'type': 102}