Control Definition and 1000 Threads

Hi I have a 9v motor (can run to 24v). I need to control the speed of the motor and reverse the direction. I also wanted to control it with a duel-potentiometer, but i can't seem to find any way to do this. can someone help with a circuit diagram please? (This is my first time building a...

Hi, I am a bit confused about somethings. I want to determine the mode shapes of a free-free beam. I assume that I can use the following? 1. the Euler-Bernoulli theory 2. the generalised wave equation 3. modal analysis With modal analysis I can use the eigenvalue problem to finally...

Hello everybody! I am a beginner in electronics and mechanical but i really want to know more in that field. Now, i want to make a remote control car with a high speed possible. I have already made one with a 3Volts DC MOTOR controlled by a PWM (LM555) and potential-meters, the power supply...

i need to find a way to control the syringe pump in my lab so that i can control the flow rate in real time from the computer, ideally from a simple dial i scale up or down. the pump can connect to the computer using a rs-232 port and someone suggested to me that labview would be the easiest...

I was told by my teacher that fire is plasma and that plasma can be controlled by magnets. Does that mean it is possible to effectively use magnets to control fire?

Hi all Im very new to all of this and require help and guidance with my project. The aim of my project is to rotate an inner tube (35mm long 20mm diameter) within another tube (21mm diameter - 80mm length) one full 360' turn and then stop in 0.05 seconds, ready for the next command. If the...

I'm new to Hardware programming, Can you give me an idea on how to create a controller on recloser via PC?? The recloser has a rs232 Port, and its a 9 pin.. Thanks... i need it badly thank you

Nanotechnology, is a study of the control of matter on an atomic and molecular scale right? I'm currently studying taking this course in my college and I'm wondering if Nanotechnology plays a part in researching cancer cells. Does Nanotechnology helps in treatment of cancer cells? If...

Hey guys, I'm not exactly sure on which forum I should be posting this topic but I decided to post it here. Any mod can move it if deemed necessary. Anyway, I have been wondering about the infrared wavelengths that a remote control emits when trying to control, say, a TV or VCR/DVD player...

Hello, I have two questions: 1- How can I control the size of a multi-line equation? 2- In a multi-line equation, I always need to open a brace in one line and end it at another line. But the problem is by using the following code: \begin{equation} \begin{split} X=&\left\{...\right.\\...

Hi guys, can u guys help me on this?? I want to design and construct an automatic light dimmer circuit that controls the energy delivered to a 12V or 24V DC light bulb corresponding to the ambient light intensity. The control of energy will be established through switching action to improve...

Hi guys, can u guys help me on this?? I want to design and construct an automatic light dimmer circuit that controls the energy delivered to a 12V or 24V DC light bulb corresponding to the ambient light intensity. The control of energy will be established through switching action to improve...

Hi guys, I have this problem for my undergrad final year project. I'm trying to design a control system to regulate the voltage output for a boost converter and I am not too familliar with control theory. I've built the control system in MATLAB based on the basic boost equation...

Yikes! :bugeye: http://www.youtube.com/watch?v=vMG-LWyNcAs&feature=fvhl

Hi all, One of my guys was working on a control ciruit for a fan bank. The control circuit in powered by a 480-120 V control xfmr. His voltages from x1-x2 were 123 Vac. Across all energized relays: 123 Vac. But when he took voltages to ground he got around 40 Vac from the X1 bus to ground...

Hi, I'm thinking about doing a small home project where I can control certain things away from home with my cellphone. I want to do this with minimal items, i.e. servers motors etc... what I'd like to do is basically send an email to my computer at home and have it operate external devices...

Homework Statement If the steady-state error of the proportional-plus-derivative-plus acceleration system is to be less than 10% determine a suitable value for Kp. Homework Equations The input of the system is: v The output of the system is: y The transfer function of the system...

To the viewer of this post, I wish to create a device which can replicate a rotation at point A at point B. What I was thinking was using a stepper motor to replicate the rotation at point B through the use of a controller and have some sort of mechanical-to-digital device which could incode...

Homework Statement F = Fahrenheit A particular temperature control system uses electrical heaters, exterior thermal insulation and a thermostat for maintaining the temperature at 170 F +/- 1 F. The thermostat turns the heater on when the temperature drops to 169 F and on at 171 F. Heater...

Hey everyone, I have a hypothesis that I would like to confirm. I won't bore anyone with the nitty gritty details, so I will try to be as general as possible. I'm doing a project on gradient ascent methods and their application to quantum control. The quantum part isn't important as my...

Hi there guys, I'm trying to design a bidirectional buck boost converter as part of a larger three way solar charge controller project. The buck boost part will be connected to an energy storage device, which will probably be a 2F 5V ultracapacitor. The aim is to step down 9v source to...

when my pc shuts off, i want to shut off a bunch of other things too-speakers, light, monitor. to do this i need a relay but am a little perplexed on the correct wiring. (Please ignore the periods. they are necessary to make this drawing look right but have no meaning) Voltage_____| . ...

Homework Statement I have an experimental setup consisting of a 755ml stainless steel cylinder being fed with Hydrogen from atmospheric unitl 10 bar. I am using a Brooks Mass flow controller to measure and control the flow of Hydrogen into the cylinder while at the same time recording the flow...

hi, sorry my English isn't perfect but please try to understand : my teacher gave me a project in which i have to use a small dc motor,op amp,and a "servo amplifier" to control the rotation of the shaft of the motor, so can you tell me what is the servo amplifier? and how to use it to control...

How to control the electron occupation numbers separately in coupled quantum dots? please give some references or some explanation Thanks.

Is a control theory class usueful for someone who wants to do experimental physics in grad school?

I have an operation where I need to reduce the speed of a 24v DC bilge blower. My question is: Can I put any 12volt or 24volt DC motor on a speed controller and reduce the speed of the blower/motor without damaging the motor, creating an unsafe/over-heating condition, or without reducing the...

I am making a project to control the speed of a DC motor using an astable. I need to be able to change the speed of an astable (555, or one made from gate) using about 8 different voltages. The only way I can think to do this is with a MOSFET was a voltage controlled resistor, but no one can...

-------------------------------------------------------------------------------- Hi All I am using a ULN2064B to control 2 stepper motors, and the input to the IC is directly from an I/O port on an 8051 microcontroller. The stepper motors are 24V, and "apparently" need 800mA each to...

Homework Statement Air enters a car radiator at 50 km/hr, 25 C. The radiator is 1 m2 facial area. 2 kg/s of water enters the radiator from the engine at 10 bar, 200 C and leaves at 10 bar, 180 C. What is the temperature of the air as it leaves the radiator? Homework Equations I did...

Homework Statement Steam flows through an uninsulated pipe at 0.5 kg/s, entering at 5 bar, 440 C and exiting at 3 bar, 320 C. How much energy is lost from the steam per hour? Homework Equations Which terms in the energy eqn can drop out? I'm having trouble with that. Is there only...

Hi all, Long time lurker, very seldom poster. I have a need for an aqueous soluble compound that will thermally decompose or oxidize to form acidic products in the temperature range 100-300 C. It's well known that, on the other end of the scale, urea is water-soluble and near-neutral pH at...

I heard its possible to control your own dreams. Can you do it? Any tips on how to do it?

hi everyone I've jst started a control unit at college and i hope some one can help me out with this question? Explain the effect of load variation on open and closed loop control systems. State the purpose of each stage and clearly show the direction of information flow. Explain the effects...

I want to build a porter governor to control the speed of a shaft via a varible dia double cone pulley. The speed range to be considered is b/w 250-750 rpm. I would like to know the equations involved. My textbook provides theoretical equations, I would be obliged if I could get the actual...

I'm ready to begin proof of concept experiments on the Mk IV Tesseract, following on the limited success of https://www.physicsforums.com/showthread.php?t=205845" What I need is a motor that - is reasonably compact (we're talking <2 centimeters) though weight is not a factor - can be...

Hi, I need some good amount of information regarding the types of control surfaces being used to control and maneuver the missiles. i couldn't find this stuff on my own. so, please help me. thanks in anticipation Abhishek

Just wanted to control if i made my math homework correctly. Just one exercise. Made it on paper and scanned into computer. The task was to simplify. Here it is: http://img504.imageshack.us/img504/6669/mathexecisewq0.jpg Please check it before 5th Januar, because i have to show it to my...

Homework Statement question: find maximum velocity error constant(Kv) feedback is :1 positive the book says the right answer is:0.75 but every time i calculate E(s) it goes to the wrong answer! please help!

Hello All, I'm currently upgrading my homebrew equipment, in order to have more control over the whole brewing process. At this point, I use store bought malt extract (sugars extracted from grains) to create the fermentable liquid that becomes beer, but I would like to start brewing with all...

So I know I am getting in over my head here, which is why I haven't started anything. I have never done any advanced electronics work, but I know what resistors, capacitors, ICs, and the like are. I can't design a circuit aside from a switch and an LED, but I can build them. Ok, enough of that...

I was just wondering if any of the females know of any good forms/kinds of birth control? If so, what are they? I know you can't really recommend any, but which one(s) worked good for you? I work at a pharmacy, but I would prefer not to work with any of the people I work with, it might be...

Hey there PF! I'm currently working on building an Infrared Remote to control a series of triacs. The objective is to create a "remote control power bar". The original plan was to use push button switches to toggle the Q lead of a 4013, each of which houses two switching circuits. Q and NOT-Q...

In my control theory textbook, frequency response descriptions is one of three main areas of the subject (the others being Laplace transfer functions and state space representations). My questions are: What is the purpose with frequency response in control theory? Why are not transfer...

I want to build a digital timer that will switch my geyser on and off at a preset time in order to save power. I don’t know much about PICs so I would rather try using only logic ICs. It has to have at least 3 preset ‘on-times’ and 3 ‘off-times’. Can anyone help me to get started?

Hello, first time poster (can't say I am a long time reader) and I've been looking for the answer to a question in regards to Aerospace Engineering. First a bit of background about my degree. I graduated with a bachelor's degree in Engineering Physics with a focus on electrical engineering. I...

Process is Out of control if 1 point plots outside 3-sigma limits or 2 consecutive points between 2-sigma & 3-sigma on same side... if mean changes to mean1=mean0 + 9...what is probability to detect shift on 1st or 2nd sample following shift? Point outside 3 sigma is ok but what @ the 2...

what is the most efficient way to pull voltage off a large dc bus(230-400) to power a control board

I recently encountered (not for the first time) a situation in which a PWM output from a microcontroller is sent to a MOSFET bridge that drives a motor (a very high current, inductive load). I started to wonder exactly WHY it is that the duty cycle of the PWM controls the motor speed. I know...

I'm taking a course in control theory, and have been wondering for a while what the benefits are when you describe a system based on the Laplace method with transfer functions, compared to when you use the state space representation method. In particular, when using the Laplace method you are...