Control Definition and 965 Threads

Reason for taking "birth control" pills One time my sister told me she was taking 'birth control' pills. She has never had sex. She never does either. I asked her why she was taking them and she couldn't give me an answer. So my question is, why would someone take them if they have no risk of...

hi ! basically i need help in simulink plotting the output can anyone help i have attached the output desireed for my model in pic below below pleasez help me out guys thnx in advance

I am a computer programmer and not an electrical engineer so please pardon my ignorance in your field. I am interested in turning a knob 5 times per day, the fifth turn is for returning to the neutral position at the end of the day using a servo (unless you know of another method). I...

Hi, I would imagine this is a quite a common concept in electronics. I am currently trying to make a small circuit which will switch a voltage supply to a small 12V motor on and off. I've had some help on here which has enabled me to pin down the type of circuit I need to get the output I...

Many newer cars have engines that can over power the brakes. Don't pump the brakes. Don't turn off the ignition. Hit the brakes and shift to neutral. Sounds easy but is it? Practice it first in a safe area according to Consumer Reports I understand that the Toyota's involved in the big...

Hey guys, I understand remote control cars and such use their little antennas and shoot radio waves to the car and control it... My question is can I make some kind of device such that I can remove the antenna on the car and instead hook up to the reciever a digital input processor which will...

I want to know the proper nomenclature about control theory. Problem is below. " There is the system, which is controlled by P control or I control (anything is Ok.) where a is proportional gain and b is integral gain. When proportional gain, a is slightly changed, system output is big...

Hey there, I’d like to know, is there any possible way to control love? How to get rid of this feeling and beat it to death! [[[Story is, there’s this guy who I really like, but I've never met him in person and he doesn't know about me, I only read his posts here. :biggrin: But I know it...

Any good tips or sites where to get started? I was thinking of making a flying wing R/C and want to put a stability augmentation system on it to keep it stable. Anyone recommend a good R/C site, control site? thanks

I want to mount some type of measuring device on a remote control car, and then crash it into a wall. As a result of the impact, I want to look at the speed the car was traveling at point of impact, as well as the rate of decelleration that occurred after impact (using various bumpers). I think...

I am doing a paper regarding active techniques to control/manipulate vortex shedding in the near wake behind a 2D or axisymmetric bluff body, such as cylinder. May I know what are the available active techniques used in controlling vortex shedding? Thank you.

I am looking into some automation of basic tasks, and think that a PLC is the best approach. http://www.entertron.com/ This is a site that another forum recommended. Has anyone else used anything from these guys in the past? I have very very basic programming skills and need something...

Hi, I am an inventor with mechanical expertise but I am a novice with electrical controls. I want to control the rotation of a horizontal cylinder so it rotates 360 degrees, returning to the same start/stop position each cycle. The cylinder is being driven by a 1hp 110v electric motor, at a rate...

Hey Guys, I'm a mechanical engineer (please forgive my ignorance) with an electrical engineering problem. I'm trying to control a small DC motor with speed and duration controls using a remote cell phone. I might also like the ability to receive temperature data from the motor back at the...

I am building a H-bridge to control motor in forward mode and reverse mode , in the attachment i draw the schematic of the circuit , my problem is that the output signal looks like in the picture DSC07167 black signal and i need it like the red signal. How should the input signal of 2 PWM to...

I have an electric smoker with a 1500 watt heat element I would like to be able to control the heat level inexpensively. Could I use a router speed control box to just dial down the power level, would I need a 15 or 20 amp model. THANKS

Hi everyone, I'm designing a light-weight hovercraft (2 light fans, 4x1.5 V batteries, 30x20cm in size). It needs to travel 6m straight ahead, then make a 90deg turn to the right and travel on for another 2m. The problem is that the craft must make this turn ON ITS OWN, meaning that there...

Is it possible to create an active noise control stereo that works like the headphones except they are stereos used to silence noise in a a room?

I want to create an active noise stereo which works like the headphones except it's a big speaker. I need your help on how i would go about doing this? I ain't no electrical engineer or anything, in fact I have no knowledge whatsoever so try to help me using simple terms.

I want 2 build a remote control circuit , but don't know how ! Who can teach me?

Dear PF Friends, Given the system to be controlled. I'm stuck in finding the inverse laplace (to find y(t) from Y(S)) - any advice?

I work for a company which performs repairs on exercise equipment. One of my biggest problems is a constant failure of a Thermistor resistor on a certain brand treadmills motor control board. I am guessing poor design, but I am hoping somebody can clear up exactly what a thermistor resistor is...

I am a second year student studying mechanical engineering and I severely need a good textbook or lecture notes(preferably) for control engineering that covers the followings: -Review of: partial fractions, complex numbers, Laplace transform techniques. - Introduction of open and closed loop...

Hi, I am a 24/7 carer for my wife who has Huntingtons disease. This has caused her to loose the ability to hold a cup. I want to devise a swinging arm with a cup attatched to one end. It will be operated electricaly with a small LEGO motor that has been geared to give plenty of torque...

Hi I have a question. Does the worth of control rod in a typical reactor is dependent upon power of reactor? Thank you in advance

ELEG -- DC Motor Control Systems Problem Homework Statement The voltage equation of a dc motor is written: ea(t)= Ra*ia(t) + La*[dia(t)/dt] + Kb*wm(t) where ea(t) is the applied voltage; ia(t) is the armature current; Ra is the armature resistance; La is the armature inductance; Kb is...

I have just bought an oopic module to control a robot, the problem is the cable for programing has a plug that will not fit into my laptop. http://www.oopic.com/pricing.htm Is there a way around this?

Is it possible to... Minimize the distance the flux travels in the x-axis from the centre of a magnet. (in 2d representation) Ive attached an cross-section image detailing what I'd like to happen. A "shield" is wrapped around the magnet, leaving only the N and S poles exposed. The flux is...

I have in mind to build a robot which needs 8 servos to provide movements, what i can not find is a control board, i want the robot to be completely autonomous, no radio control or wires to computer doe's anyone know if a board is made for what i want? Thanks.

Analog Signal Loop/Switch Control? Hello fine people of this board. I have been working on a custom project here for a year or two and I'm stumped at this point. I am working with 16 analog sensor/signal loops (16 ins and 16 outs). There would be 2 main signal inputs, and 2 signal outputs...

Homework Statement I have a transfer function in the laplace domain, and I have been asked to: "Develop Relationships in terms of the constant parameters and adjust K such that the constants are: A = 2, B = 1, C = 3, a = 3, b = 1" After finding this relationship, I am asked to convert it back...

need a tutorial on how to model piezometric material in ansys.. i am working on a project related to piezometric control of vibration..please need it very urgently!

Hi I have to question which i can not find any information on !st question: is it possible to control the length of a light beam 2nd question: is there any form of light which are viable in daylight and air without the use of a haze machine or is the plasma phenomenon the only...

I have been worried about my mother lately, because of the way she behaves. She has a serious lack of ability to concentrate. It is almost impossible to tell her a full sentence sometimes because she will interupt, change the subject, and it is clear she didn't absorb anything I said. On top...

I was wondering if I had two inputs going to my headphones, one being the intercom on my airplane and the other being an ipod. Could I put two pnp transistors with collector and emitter on the ipod connections and the base connect to the intercom. So when audio comes threw the intercom the ipod...

Dynamic Soaring takes advantage of differeing wind flows separated by a thin wind shear boundary. Recently the record for radio control glider reached 392 mph (peak speed is over 400mph, but the convention is to measure the uphill return speed: http://www.youtube.com/watch?v=WaQB16ZaNI4&fmt=18

Q: 1) A thermometer requires 1min to indicate 98% of the response to be a step input. Assuming the thermometer to be a first order system, find the time constant. 2)If the thermometer is placed in a bath, the temperature of which is changing linearly at a rate of 10degrees/min, how much...

Does anyone know of any good university labs that do research in flow control and its many applications? I know RPI has a flow control lab and Maryland does some research in this as well.

Im trying to figure out how a certain example is working. in this example the function x = g - \frac{k}{m} \frac{(z-z0)^2}{(i-i0)^2} where g, k, m, z0, i0 are fixed values and z, i are variables The function above is written as x = f(i,z) ( \sqrt{g} (z-z0) - y (i-i0) ) where f(i,z) is a...

Hello I have a project in the works that requires a DC motor to turn a somewhat heavy (but with good bearings) gear assembly. The whole thing will be running off of a common computer power supply at 12V. I haven't selected the motor just yet but am leaning toward maybe an old cordless power...

Hi, I'm new in this forum. Nice to meet you all. I'm currently working on a project that uses AC motor. The goal is to make a position control system for the motor. Currently I'm using the Altivar 16 Square D inverter to control the speed of the motor. It uses a logic voltage to control the...

Hello. I am building an LED striplight for my room. For the device, I would like to have three separate channels so that I can easily color mix Cyan, Magneta, and Yellow. I know the basics of circuitry and wiring the channels, but I am not sure how to control the channels. I was considering...

apparently the green pills are placebo pills I was going to start taking them when my period started it hasnt started yet & my friend said it hasn't started yet because I haven't started taking the green pills I've just been taking the pink pills obviously, I don't want to take the placebo...

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...

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...