Timeline for Stability in control theory and electronics
Current License: CC BY-SA 3.0
5 events
| when toggle format | what | by | license | comment | |
|---|---|---|---|---|---|
| Dec 5, 2016 at 9:09 | comment | added | LvW | No, the system will be unstable (and oscillating) - independent on the input signal. It is a matter of SELF-EXCITEMENT!. | |
| Dec 5, 2016 at 8:04 | comment | added | emnha | So instability is the internal property of the system not the external applied signal? For example, a system that has phase shift -360 degree and loop gain still larger than 0dB at frequency fosc. However, if the applied signal doesn't contain the frequency component fosc, then the system is still stable? | |
| Dec 5, 2016 at 7:53 | comment | added | LvW | ...."there is a frequency causing the system unstable". No - that is NOT correct. It is not the input signal that causes instability (oscillation). It is the internal positive feedback that causes SELF-EXCITEMENT - independent on externally applied signals. | |
| Dec 5, 2016 at 6:09 | comment | added | emnha | Thank you. As my comment in the vini_i post, I would like to ask you this question too. When using impulse to test for stability, assuming that the system is unstable, there is a frequency that causes oscillation. Now should we test one frequency component at a time to the system? The impulse input has infinite frequency components, so there is a frequency causing the system unstable. However, is the a possibility that other frequency components in the impulse will cancel the oscillation caused by one specific frequency component in the pulse? | |
| Dec 5, 2016 at 2:42 | history | answered | Tony | CC BY-SA 3.0 |