# Questions tagged [control]

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### Measurement delay versus control delay

For a typical control loop (no delay, measurement transfer function is 1) the closed-loop transfer function is $$H(s) = \frac{G_{comp}G_{process}}{1+G_{comp}G_{process}}$$ With an actuator delay ...
48 views

### What does it mean that a zero is slow?

I am studying control systems, and I have encountered the definizion of slow zero. I am searching on internet and on books, but I don't understand the meaning this. I know that if a zero is too slow, ...
12 views

### What is the difference between robust stability and robust performances for a MIMO system subject to uncertainty?

I am studying control systems and I am focusing on the case where uncertainty is present in the system. I have seen that in this case I have to be able to garantee robust stability and robust ...
30 views

### Does a RHP zero imposes some limitation in the time domain?

I am studying control systems and I have seen that a non-minimum phase zero imposes limitation in bandwidth , which is that the bandwidth has to be lower than a frequency which is half the frequency ...
52 views

### Problem in verifying zero blocking property of a zero of a multiple input multiple output system

I have a multiple input multiple output control system, and in particular a two inputs two outputs system. I want to find the zero state direction and the zero input direction of the system, which has ...
40 views

### Is it possible to use a control scheme with a delay as prefilter?

I am studying control systems, and in my studies I have encountered the topic of control scheme of the form and I have seen thaht this control scheme is really useful since it is possible to add a ...
21 views

### Can a pole at the origin be considered a dominant pole?

I am studying control syetems, and I have studied that the dominant poles of a system are the ones closer to the imaginary axis. Now, consider a system with a pole at the origin. Can this pole at the ...
8 views

### How do I design a reference filtering control scheme with a lead compensator?

I am trrying to design a lead compensator for a system. I have the following control scheme: where $Cr(s)$ is a prefilter which can be a lag or a lead compensator. My obkìjective is to design $Cr(s)$....
11 views

### Why does the step response has higher overshoot if the zero is too slow in a lead compensator used as a prefilter?

Consider a control scheme of the following type: where $C_r(s)$ is used to filter the reference, and it can be a lead compensator of a lag compensator. One thng I don't understand is why if I ...
40 views

### Why does the control effort increase if the bandwidth of the system is higher then the bandwidth of the plant?

I am studying control systems and I am focusing on the control effort. I have seen that if I place a pole at higher and higher frequencies, if the bandwidth of the system goes above the bandwidth of ...
10 views

### Doubt on limitation of the bandwidth of the control sensitivity function

I am studying the mixed sensitivity design for control systems, and I have seen that by introducing weights, which can be for the senstitivity function, complementary senstivity function and the ...
18 views

### Understand diagram of a process

I've found this diagram in a slide, but i have no backround to properly understand it. Could you explain to me, in simple terms, how this process behaves and what's the purpose of the blocks $z^{-1}$ ?...