Control Definition and 965 Threads

Hello, What is VCD and how it work?

Hello all! I am going out on a limb here looking for information as I am unable to find the answers scouring the internet. Essentially I want to know how a person would go about getting a job working with Gas Turbine Tuning and Controls? I've got an engineering background, lots of gas turbine...

Hey, I want to set my own delays to a composite video signal, for use of live video feedback effects (for visuals / art purposes). I am no electrician, but this can't be hard to do right? After searching a few hours online, I haven't come up with any device that I can buy which will do this. Is...

I don't have much spear time at the moment, but I came across a SMPS diagram in this thread: https://www.physicsforums.com/threads/quick-question-about-inverter-tx-order-wrt-mains.870309/ And I was trying to figure it out, and I don't want to forget about it before I do. So I was wondering if...

Hi Guys, I need some material to update, or, better said, to reinforce my skills in Digital Control Systems. In the very beginning I thought on "Digital Control Systems by Benjamin C. Kuo", but, after think about this, I realized that, maybe, this is an oldie for this subject. Do you have any...

Hi, Having a bit of trouble with this question: "Assuming a proportional controller is used, determine the gain to achieve a damping ratio of 0.5, for the following transfer function. Hence calculate the associated natural frequency and oscillation period. G(s) = -4(s+0.4) / s^2+1.6s+14." I...

Hello, In case of DC we use H-Bridges To control Dc motor direction and Speed with PWM. But in case of AC motor Single phase and 3 phase motor how to control Speed and direction?

Guys, I'm having a lot of issues where I work with a sewage scraper bridge chattering it's drive contactors when being called to run, the coils for the contactors are switched on their neutrals from an Allen Bradley logix processor. The control circuit is 24v AC. I've spent a few hours on this...

Hello everyone, so my dilemma is this: I graduated with a degree in physics which had a curriculum that did not cover control theory. I recently got a job as an EE and am now likely to be tasked with designing controllers. How can I most quickly and or thoroughly gain a good applicable...

Hi, This question on PD control is from a practice quiz. 1. Homework Statement If you can't see it- the question asks to find values for Kp and Kd such that the system achieves 5% OS and has a settling time Ts of 3s. Cs = 3 Cd = 2 m = 5Homework Equations ω_n^2/(s^2 + 2ζw_n + ω_n^2) - 2nd...

Hello, I'm posting the first time on this forum. I want to create a robot controlled by an Arduino which is able to make a touch signal without using a mechanic arm or finger ( here is a robot with the same goal but using an arm video). I want to take the electrical approach. A modern...

Hello, I got the following diagram, shown below, and I have to derive its transfer function. I think I have a general misunderstanding about the transfer functions. What I think it is, is: output/input basically. As input is the whole block of things that affect the output. This is the system...

Hi everyone, I have an engineering background, I'm an EE, but I know almost nothing about mechanics and that's why I'm writing here. This is the challenge: how to control the rotation of multiple discs along the same axis? Assume you have a sliced cylinder. The ideal scenario would be to...

I have found this topic but I am not allowed to answer. https://www.physicsforums.com/threads/fuzzy-logic-control-vs-pid.667717/ I have the same concern that the fuzzy is basically similar to a proportional control. In the thread I liked above, there is also this link...

Consider the following circuit with Vs=1V, R=1Ω and C=1F. The voltage transfer function of the resistor can be written as Vr(s)/Vs(s)=s/(s+1). Now I understand s is complex frequency and at s=∞ the transfer function becomes unity since capacitor acts as a short and Vs=Vr. What I don't...

all of automate system in our body. digesting food, put oxygen on our blood and pull carbon dioxide out, immune system, wound healing...etc does our brain control all that even without our awareness? or those can still work even without brain order?if true... wow, our brain may inferior to...

Homework Statement Question 1: An insulated 8-m3 rigid tank contains air at 600 kPa and 400 K. A valve connected to the tank is now opened and air is allowed to escape until the pressure inside the tank drops to 200 kPa. The air temperature is maintained constant by an electric heater during...

Hi all, I'm having some trouble figuring out why entropy is used instead of enthalpy for an open system. From what I understand, an open system uses entropy to calculate internal energy. Since the control volume is constant (i.e. Δv = 0), wouldn't using : h = u + PΔv effectively be h = u? So...

I have a project to build a water level control system. Basically I will have two sensor probes one connected near the bottom and the other near the top. When the water level goes below the bottom sensor it will trigger a pump to pump water back into the tank until it reaches the top sensor...

Why are potentiometers not a good method of speed control(in terms of energy)?

The situation: I have one BMS (Building Management System) controller supplied from TR1 (220Vac to 24Vac transformer) and provides an analog control signal (0-10VDC) with the (-) of that DC being the same as the Neutral of the controller (from TR1) and should control a valve actuator. The...

What are control regions? Is it a different name for "signal region"? If yes I don't really understand what they mean with the following: http://www-cdf.fnal.gov/physics/ewk/wwllll/

I´m simulating an induction motor control using DTC (direct torque control). I want to tune my PI controller to achieve a fast start up, but I don't have a transfer function to make an analysis. How can I set this controller?

I'm a sophomore of Mechanical Engineering, but I do like delving into more advanced subjects that I haven't seen in undergrad yet, and among those are fluid dynamics. I've made a little bit of research into turbomachinery (while looking for some classes that could interest me hereafter) and...

From what I've seen, most engineers - outside software engineers - work with Matlab and spreadsheets like Excel. I don't know how to code in Matlab yet, so I'm not sure about how different it is from traditional programming languages like C/C++. I'm more interested in Control Engineers - and...

Hi guys, I do apologize if this thread is in the incorrect place.. Long story short, I'm doing a university project based on developing an AI to control the power plant energy output. From my research so far, I've concluded that the control rods control the fission rate. The problem is, I for...

Homework Statement Below is the bode plot of return difference, 1+C(S)P(S) in a feedback system. Identify the frequencies where the feedback is large, negative, positive and negligible. P(S) = \frac{100}{s^2+2s+1} C(S) = \frac{220(s+50)}{s+200} Homework Equations Bode Plot, Feedback The...

So I understand that thermodynamics of a chemical reaction is the change in Gibbs free energy and that kinetics mainly deal with the activation energy (or production of a high energy intermediate). My question comes from something that my organic chemistry professor stated in class. He said...

Homework Statement The state space model of a nonlinear system is x'_1(t) = 2x^2_2(t) - 50 x'_2(t) = -x_1(t) - 3x_2(t) + u(t) where x_1(t) and x_2(t) are the states, and u(t) is the input. The output of the system is x_2(t). Find the zero input response (u(t) = 0) of this system linearized at...

Homework Statement Find the transfer function for the following mechanical system with force input fin and output x2. Homework EquationsThe Attempt at a Solution The reason I left the equations blank is because I'm not sure how to appropriately model this scenario. I've seen two different...

I've recently got back to writing more of my SF novel (after a lengthy interval) and picking up the threads again, I find myself instantly confounded by a problem that has been waiting for me all this time: detecting spacecraft at a distance - by which I mean distances counted in dozens of AU...

Homework Statement The state space model of a nonlinear system is x'_1(t) = 2x^2_2(t) - 50 x'_2(t) = -x_1(t) - 3x_2(t) + u(t) Where x_1(t) and x_2(t) are the states, and u(t) is the input. The output of the system is x_2(t). Find the state space model of this system linearized at the...

Dear Forum, I am trying to run a random software (such as skype), there is easy to run by mouse and click on the icon on the desktop. Now, I am trying to take advance by using CMD (command prompt). I am going to type some basic command to make skype run, but I do not know how to go into any...

Dear Forum, I am trying to use Python to control FLIR camera (tau 2.4) but I do not know there is possible or not? I say that because I see when I connect IR camera to the computer using USB, it shows COM port in the Device Manager and I've seen python possible to work with COM port through...

Is there any instrument for checking pollution rate of exhaust gas having mach number greater than one?

Hey all, It's been quite a while since I've been on here, I'm an IT Technician and recently lost a student to brain cancer at the age of 11 so i thought I'd brainstorm until i worked out a possible and feasible way to beat cancer, this might be sci-fi or false information as I'm not entirely...

I'm building a hybrid car for my kids. I'm up to speed control and hitting a few hurdles. The set up is 4 x 12VDC motors, one to each wheel through a reduction gearbox. I've wired them to a single bus, and have used 4 standard relays to deliver forward/reverse. I have tried varying the speed...

I am trying to make specific gravity controls using ethylene glycol and DI water. Ethylene glycol has a specific gravity of 1.113. I want to know the weight in grams of EG to add and then QS with water to achieve 50 ml of a solution with a specific gravity of 1.002. I need a formula please...

hi guys... am working on a variable refrigerant flow (VRF) type air conditioner. my aim is to change the capacity of the compressor based on load change. i can vary compressor capacity by using inverter...now my doubt is on what basis i should change compressor speed for muti evaporator...

I understand that Thermodynamics studies systems at the macroscopic level, but I am still somewhat confused with respect to closed/isolated systems. Does nuclear radiation still count as a control volume? Our instructor asked if the ISS was technically a closed/open system. Would the constant...

In what ways would a dissolved anion of chromate/dichromate such as in potassium dichromate, be dangerous? I know it's a strong oxidizer and a carcinogen (causes cancer), I would like to know what kind of contact will cause these to take effect and to what extent (i.e. contact with solution...

Hello, i have to launch a ping pong ball for an engineering course. We have a system set up with two wheels spinning as fast as we can get them and a ping pong ball feeds between them and shoots. Our asignment is to create a model that shows distance shot related to the angle of launch. We also...

Homework Statement 2*3*4*5/4+3*4*4*6 Homework Equations 2*3*4*5/4+3*4*4*6 The Attempt at a Solution 2*3*5/1+3*4*6 Knowledge gap 1 - I do not understand why if top and bottom are divided through by 4 there should be a 4 left in the denominator and why the rest of the numerators and...

Homework Statement Determine the closed loop transfer functions of the systems shown below: Homework Equations Standard block diagram algebra. The Attempt at a Solution I've moved the take off point such that the diagram now looks like: I am having difficulty determining G1(s). The...

How can I set the ranges of memberships in a fuzzy control? I know my rules, but I don't know how to set ranges, the input of the entire system is a step and after the fuzzy block there is a transfer function and the output.

Homework Statement Hello, I want to control a system that looks like this Homework EquationsThe Attempt at a Solution So my relative gain array is $$ \Lambda = \begin{bmatrix} 0.8537 & 0.1463 \\ 0.1463 & 0.8537 \end{bmatrix} $$ So I know I should pair ##u_{1}## with ##y_1## and ##u_2## with...

Homework Statement A magnet is used to control negative ions and only allow those with a specific mass to pass through a narrow gap opening . The magnet will bend the ion beam in a quarter circle of radius 50 cm . In an experiment, a negative ion accelerated by a voltage of 3.0 kV. Which...

Hi All, I'm working on an automated chiller control system for final year project. It is a logic control that automatically set the chill water supply temperature based on current demand load and the chillers performance curve to achieve the best efficiency COP for the system. For a variable...

Figure P6.95 provides steady-state test data for a control volume in which two entering streams of air mix to form a single exiting stream. Stray heat transfer and kinetic and potential energy effects are negligible. A hard-to-read photocopy of the data sheet indicates that the pressure of the...

I often encounter situations in my professional development like if ( condition1 ) { // do this } if ( condition2 ) { // do that } if ( !condition1 && !condition2 ) { // do something else } and I handle it in exactly that manner. (Note: this is not an if-elseif-else situation...