Control Definition and 965 Threads

Hi, I wanted to create my own computer fan control and bought a 100ohm potentiometer. I have hooked the pot as shown in the picture except that it is in the yellow wire (+12V) and not the red one (+5V) , black is ground. The fan will start at full speed and doesn't change one bit if I...

My system is a compound pendulum hinged at some distance from one end and have a propeller mounted dc motor at the other end. I wish to position the pendulum with the help of motor propeller system. I tried but i am unable to get a mathematical model for it. I am getting a non linear model...

Since I last posted here, I've experimented with small DC motors, parallel and series circuits, messed with my electronic-building kit, and even did a little Job Shadowing (temporary internship) at a local electrical engineering place for school. I definitely want to make this into a profession...

Hey everyone, So we know that closed quantum systems evolve according to the Schrodinger equation. Now in open-loop quantum control, we essentially only ever deal with the operator version of this equation i\hbar \frac{d}{dt} U(t) = H(t) U(t). That is, quantum control is often done in...

I am doing research on the Chernobyl disaster. I came across something that seemed strange... Apparently, the control rods were covered in graphite moderator. As far as I'm concerned, a control rod absorbs the neutrons and stops fission reactions. However, the graphite moderator's function...

So I have a control systems mid-semester exam coming up and the lecturer has posted up a formula sheet for us. However it is different to past years exams and has a geometry section with the following equations: e^(±jθ)=cos(θ)±jsin(θ) cos(θ)=(e^jθ+e^-jθ)/2 sin(θ)=(e^jθ-e^-jθ)/2j Now I've...

I'm looking for information on how hot swap PSUs as used in computers (used typically for data center servers) are designed. In particular, I want to focus on the common aspects between the 2 or more PSU subunits that can be swapped. What kinds of connections are made between the individual...

For some programs I frequently use, I must click on a confirmation box each time I run them. This box does not show up if I don't run them as administrator, but if I don't run them as administrator I cannot save/edit files with these programs. I want the confirmation box to not show up for...

Hi, all. (please see the attachment in the next post) I'm re-using an old power converter in a design, which unfortunately requires a rather large minimum load to properly regulate. I can't alter this converter; I have to use it as-is. But, I can monitor the output, and add circuitry as...

I am preparing for my control theory exam, but I have come across that I am struggling. I have a third order system and its asking to me determine when a value of an adjustable parameter, K for when the system is critically stable. I just don't know what this corresponds two for a third order...

Hi, I assume this forum is not only for help with engineering problems, but also a community of experienced industrial engineers of all areas. I'm graduating this year, with a mixture of knowledge from mechanical / control engineering, some of this has consisted of PLC and Matlab programming...

When we move any part of our body for e.g our hands, obviously, our brain contro9ls each and every movement of our body and the processes which are involved in it. The question is that how does the neurotransmitter get involved in such movements ? I mean, it is understood that there are...

Can anyone provide some introductory links of Model Predictive control Thank You, Yaswanth

I am modelling the vibration of a 2 D.O.F system with damping in Simulink. I want to set up control such that if the control value is between two values (max and min) then it sets the control value to the specified input but if it is outside the max and min interval then the control value is...

I am modelling the vibration of a 2 D.O.F system with damping in Simulink. I want to set up control such that if the control value is between two values (max and min) then it sets the control value to the specified input but if it is outside the max and min interval then the control value is...

Hi guys, my first post on these forums. I am learning electronics and am still very new to this all. My current tinker project is to learn how regular tv remote controls work. So far I have understood that the remote sends blinking IR pulses through an 940 nm LED. The remote uses...

Last year I built an electric car. I converted a 1966 MG to electric using 8 led acid batteries (96V bus), a DC motor coupled to the transmission, and a large motor controller. The vehicle was working fine. Top speeds of 55 mpg, but with many led acid vehicles, only a 20 miles range. The DC...

Help! I'm a third-year chick in engineering, stuck on a block diagram reduction problem for my control systems engineering course. Please email me and I'll send you a screenshot of the problem! kati@sidwall.com Thanks a mill. K xo

Hello. I know that control rods in reactors work by absorbing neutrons that would otherwise be used to collide with say, Uranium, to cause fission. But here is the part I do not understand: As far as I understand, a Uranium atom fissions because it absorbs a neutron causing it to become...

I am in the early stages of the design of a telescope mount and I need a control motor. I am hoping to run it on a battery so I think a DC motor is the way to go, but I need to be able to keep the rotation speed extremely constant for photographic purposes. So, to my question: Does anyone...

Could anyone suggest me good books for mastering control systems?

I am designing a bluetooth remote control car using the pic16f628A. any suggestion of how I should start designing my program?

hi everybody i need to design a temperature control unit that works in acordance to light, ie: when there is minimal light then the heating element must come on, and when there is lots of light the heating element must go off... these are the following specs of the design: -555 timer must...

Hello, I've been trying to figure out how to design a control circuit for a project of mine with no success. I could use a little guidance. The proposed circuit is a board powered by a simple 9V battery. It will have a temperature probe connected to it. The circuit is supposed to close...

Homework Statement (See Attachment for image) Part 1) This system is a model of an actuator with internal springiness, also called a series-elastic actuator.The system naturally decomposes into two subsystems: i) the mass of the actuator m1 with viscous friction b1 due to sliding on the...

Homework Statement Consider a system in which R 134-A is moved through an evaporator. The evaporator removes energy from the the surroundings at a rate of 0.54 kW. The pressure = 120 kPa and x = 0.2 right before the fluid enters the evaporator. After exiting the evaporator, the pressure = 120...

Hello, First time posting here as I havn't been able to find a suitable answer to my question to help me understand some issues I am having with DC motors. I am trying to calculate the maximum speed and acceleration of a dc motor being driven by a current source with a known inertia. I...

Homework Statement A unity feedback system of the form: X(s)-------->Gc(s)---------->G(s)------------>Y(s) | | | | ----<------------1---------<---- has a plant: G(s) =...

http://arxiv.org/abs/1102.0270 "The first hazard is well known in Euclidean quantum gravity. It is called “minbus” or “baby universe” [6]. ... The approach is called “causal dynamical triangulation” (CDT) and has been shown numerically to provide “birth control” [9]"

I want to ask if it is possible to remotely monitor and alter the signals of the brain of an individual and whether this require the use of some sort of electronic neuroimplant or not. Would be interesting to know if and how this can be done without the use of an implant. (Because seems to me...

I am building a Cigar Humidor, and need to have a fan control to operate 18 3.5"Computer Fans simotaniously as well as controll there speed. Here are some specs on the fans... Rated Voltage: 10.8~13.2VDC Starting Voltage: 7VDC Rated Current: 0.16A Power Input: 1.92W I have found...

King wants to make it illegal to knowingly carry a gun within 1000 feet of an elected federal official or judge. What's his point? If some lunatic wants to shoot a Congressman, will he be deterred by such a law? I simply don't see how such a law would give additional protection to public...

I'm trying to control the temperature of a wire/steel rod in my experiment. (of various size from a simple wire to a steel rod of diameter 5mm) In my preliminary experiment, I simply heated with alcohol lamp. But I'm not so sure which equation to use and if Q=cmT is the right equation, how I...

I've been trying to learn about home automation devices that can be controlled from a remote location. Most of what I've read requires that I have a computer running at home and that I send the commands through the computer. I'm trying to figure out if there are devices that I can plug into my...

I'm trying to refurbish a Heliostat and utilize a computer to control the three phase motors that came with the device. However, I'm having an issue with my control circiut for the three phase relays I've purchased. I'm using two Struthers-Dunn 645RT series SS motor reversing relays which...

Homework Statement Calculate the Kalman-Bucy Filter equations Homework Equations F=(0 1)' K is unknown but y = X_1 + d/dt(v) E=((Fw-Kv)(Fw-Kv)')=FQF' + KRK' Q = E(ww') and R = E(vv') The Attempt at a Solution There is more to this question but I am just having trouble understanding where Q...

Homework Statement Find T,K value such that the system's percent overshoot is .254 and peak time is 3 http://img560.imageshack.us/img560/6139/problemz.png Homework Equations [PLAIN]http://img46.imageshack.us/img46/51/releq.png The Attempt at a Solution...

CONTROL Fluorescent light!111 Why is it hard to control the intensity level in a fluorescent light? Thanks -_-!

I'm not a science student; have some basic knowledge of it. So, please explain in as much detail as possible. Thanks. I have seen some old TV sets with a round knob to adjust volume. A guy told me that it's an analog volume control while the new TVs come with digital volume control where you...

Building a wind simulator. Control amount of electricity?? I have about 20 6" fans that i'd like to mount to something in which I can control electricity to each fan and essentially simulate wind. I looked at light DMX controllers for DJ's and that would be perfect except the electricty...

We are designing a foot pedal mechanism to actuate two hydraulic pistion pumps. But the torque to actuate a pump is more than 50In-lbs at full stroke. In addition, a spring is used to make the control shaft of a pump return to its neutral position. Totally the torque to actuate a pump is...

1. What does the ”P” in PID control stand for? How does it work? 1. What does the ”P” in PID control stand for? How does it work? 2. What does the ”I” in PID control stand for? How does it work? 3. What does the ”D” in PID control stand for? How does it work? 4. give me 3 examples of...

Hello everyone, I'm slightly confused here. After ovulation, progesterone increases markedly. Now progesterone is also used as a contraceptive for creating a hostile environment for fertilisation and not allowing sperm to enter. So after ovulation how does fertilisation occur normally, if...

I am studying for an exam coming up and came across a question that i am having a little trouble with. [PLAIN]http://img442.imageshack.us/img442/825/screenshot20101112at110.png I think i could do this in MATLAB, however i will obviously not have MATLAB in this exam. I have a set of equations...

http://www.washingtonpost.com/wp-dyn/content/article/2010/11/09/AR2010110904915.html Perhaps. I do know that in my eyes, Palin has discredited the GOP. Palin and the tea party are claiming credit for a sweeping victory in the House, but the economy alone was likely sufficient to account for...

Homework Statement Show that the geometric multiplicity (denoted by Qi) associated with an eigenvalue(lamda i) of an nxn matrix A can also be expressed as Qi=n-rank(A-(Idendity Matrix)*(lamda i)). P.S.:: Lamda i is simply a scaler quantity since it is an eigenvalue where A and...

Hello, I am currently half way through my forth year of undergraduate electrical engineering at the University of Waterloo (Canada) and am considering going to graduate school for control engineering. Unfortunately, mostly due to poor work ethic on my part, my GPA is only about 3.3/4.0...

A normal servo motor gives a highly accurate response to an input, with the output being an angular position of the shaft. For example, give it a 2ms pulse and it might go to +63 degrees. I am wondering what sort of motor (or system) is used to control an amount of force or pressure. For...

In speed control of a induction motor, why E/f or V/f control is employed mostly rather than variable frequency control? I've read few books on this topic but still I feel ambiguous. Please can anyone come up with clear explanation.

Hello Everyone, I am trying to put together a PI controller for a boost converter. Vin = 150V Vout = 300V (Require this much boost) Switching Frequency = 25KHz I am attaching a schematic in PSPICE. Please , someone, tell me if the connections are right. Also V-PULSE / SAWTOOTH = (0...