Control Definition and 1000 Threads

Homework Statement I have the following matrix: A=[0 -1; 0 -1] and i need to calculate: exp(At) in several ways, 2 of them are using the reverse Laplace transform and using: I + Ʃ(A^kt^k)/k! i have tried to start the series but i am getting an expression that i can't say which series it...

For a senior engineering class I need to design a device that, using a 5 volt source I need to deliver a 5mA current with a load that can vary from 500-100K ohms. Using transistors I know one can create a current limiting circuit, but once the resistance gets high enough (not sure how to...

Excuse my lack of knowledge on PWM and fans, but can a fan configured with 4 wires (power, ground, tach. signal, and PWM input) be run off of a DC power supply without using the PWM to control its speed? As in, not using the PWM lead and just hooking up power/ground and controlling fan speed...

Hi Everyone I am new to this forum. I currently work for a company that uses a flow waterjet. It is an awesome machine but of course it can be super loud. I am in the process of researching a way of reducing or even canceling out the noise that it produces. I believe that Active Noise Control...

I am fairly new with simulink and only went through a couple of tutorials on how to use it. but i am looking to do some control system design with a 3D model. I know i have lots to learn so i would like to get some directions as to where i should go to reach my goal. I am looking to...

I'm programming a camera for a game, and to achieve some effect I think the best solution would be some kind of function. What I need to achieve, is a function that: - 'starts' at x1, with a y value of y1. - 'ends' at x2, with a y value of y2. - I also need some parameter to control the...

Homework Statement So I have this question given to me, basically there is a aero simulator which makes the ground shake so the data logger gets false readings, now to solve this problem a vibration absorption system has been added. Please see the attached System A.png file for the complete...

Hi, I am currently designing a stabilisation device for use in water. The general idea is using an inertial motion sensor to detect the orientation and propellors to correct it. I have very little knowledge in this area and was wondering whether I can use a phidget to achieve a wireless feedback...

So an electrical motor converts electrical energy to mechanical one. But an electric motor can just produce a single motion in of itself. How come connecting a mechanical arm to it allows a diversity of movements like rotation, verticial and horizontal motions to both directions!?

Hello, I have abnormal situation on a site, there are installed 3 valves in parallel (cascade) in Fuel gas skid, upstream pressure of the valve is 30 bar, downstream pressure 25-26 bar, when 2 GTG starts up to load 40 MWt (100 %) the downstream pressure of the control valves decreses to 21 bar...

Hi, I want to modify a program that was written long ago. I would like to give the output from hardware as user input. Here, user input deals with current at maximum duty cycle allways. My task is to control the current according to the user input. Let say, if user wants 2kA as O/P and i...

"engine and control systems" vs "powertrain" I am interested in working for a person in charge of "powertrains" on cars, and I have an interview for a co-op opportunity to work with someone in charge of aviation "engine and control systems" how much would these things overlap? i guess both...

Hi anyone I have 7 small 12v dc motors RF-500 TB, max efficiency 0.08 amp max speed 2180 rpm. These motors are just holding plastic reflectors of an american police car's roof barlight, they are individually fitted in separate pods with their own 50 watt bulbs. I need 5 pods to spin slower...

Hello all. I have a platform that is controlled by two electric motors (one for elevation, one for rotation). During the application, I would like to have the platform maintain it's current position. I'm imagining a system where you set the position manually, and then press a button that...

Does anybody know of any good resources they can point me to for implementing PI control in an embedded system? I'm not necessarily looking for PID control - just PI. Books, websites, etc. - any suggestions are welcome.

We have recently (Oct) fitted 7 IR heaters which use triac based controllers. There have been any number of problems with the controllers and IR halogen elements failing. The supplier has now suggested that we may have interference or spikes on our mains supply which they claim may affect or...

[b]1. I'm carrying out the modeling of control valve using Physical method as part of my project. The first step is to get the physical model representation of a valve and then carry out the modeling. Secondly, I need to incorporate friction in the modeling to see the effect. I've seen a number...

hello friends, how can i generate a PWM control 2 kHz with PIC16F84

Hello, I've got an extremely limited background in electronics, so I'd like to ask for some advice regarding this circuit: I found the diagram online, It's supposed to allow variable control of a load up to 1500w at 120v, using an ordinary light dimmer and a 600V / 40A triac. After...

I've been looking at nonlinear control system and fuzzy control in particular. If I simply want to do trajectory control (have the system to follow a certain trajectory in phase space), can I use much simpler local linear control? I mean, for each point in phase space, do a local...

Hello, I have been obsessed with PID control concept and i want to notice you my doubt here. PID controllers are very useful in industrial applications to make the error free process(learned from the web). Basic PID controller mechanism is to tune the values P(Proportional gain)...

How should we understand "control the voltage, not the current"? And provide "roundabout" for spikes? I mean seriously, isn't V and A closely related? You regulate one, you end up regulate both?

Good day to you people, I have just started learning control theory at Uni, as part of my course, and I have to admit it is quite difficult to grasp. I am starting from the basics, and I am having difficulty understanding what 's' is supposed to represent as regards the Laplace transform...

I understand that in theory one can adjust the blade pitch or the speed or the yaw to control a wind turbine. Every time I do a search on turbine control this is all I come across. However I want to ask the question at a more "actual" level. What actually happens. Do they use PI control...

I'm toying around with the idea of writing a simulator, ideally for a less automated and relatively operator workload-heavy reactor like the pre-Chernobyl RBMK design (as watching a machine run itself is no fun), and I'm trying to find information on the function of an actual control room's...

Hi, First post here, but I've been reading the forums for a while getting answers for various projects. I am currently working on a lightweight motion control camera arm (kind of a small jib arm, but with servo actuators). I've researched a lot to figure out what force I would need in...

http://img20.imageshack.us/img20/2350/qqqqmf.jpg http://img220.imageshack.us/img220/5246/transfixed.jpg I'm pretty sure I got the right system reaction. My problem is whether I got the right system output. Did I?

Can you draw a force diagram to explain how a positive caster angle makes wheels return to a straight line in a shopping kart (as an example), while a negative caster angle would have the opposite effect. Thx

Here is a link to Cal Polys ACS they built. My question is: they claim each reaction wheel is angled at 29.3 degrees. Why would that be? My only guess is that they are each pointed at the CoM.

Hello, I am an undergraduate in EE, for the last year I have taken two control courses (classical control theory, and digital control) which I find very interesting and considering taking an Msc in this subject. Are any of you a control engineer and could you describe what kind of job you do...

Any one interested in a job in the wild and woolly world of Instrumentation and Control Engineering? If so ask away.

Hi ! My name is Max and I'm a Mechanical Engineer. I'm working on Control Moment Gyroscope project, but because for a long time I didn't deal with theory, I'm stuck at some very basic dynamics problem. In this article http://www. spacecraft research.com/files/BrownPeck_JGCD2009 the author writes...

Hey folks wondering if anyone knows some good books on the following subjects... Orbital transfers, specifically to Lagrange points with information on stable/unstable manifolds. Control theory of satellites, new to control theory so perhaps I should be looking at a general control theory...

Hey guys and gals, I'm not an electrical-anything so please forgive my lay-person speak. I work in a lab. One of our rooms has a high magnetic field. It is causing interference with some analytical and computer equipment. Of course there is some health concern as well... Half of this...

Hi there, we recently completed a laboratory session on MATLAB relating to an RLC Circuit and arrive at a code and relevant inputs and got our graphs as shown below. I was just wondering if anyone know if these are correct and make any sense? Or any other comments appreciated. We also have...

I am a hobbyist, and I am not too familiar on to how to run motors. Can someone help me design a simple circuit that drives a dc motor on pulley drive of a conveyor belt. I only need a steady speed, I am not changing speeds. The conveyor belt has to stay on for 5 seconds after a switch is turned...

There are three speed control methods in a shunt DC motor - Field resistance control Terminal voltage control Armature resistance control In the field/flux control method induced torque decreases and speed increases due to decrease in flux, that is why power remains constant. This is what I got...

So I'm taking a bunch of pics at regular intervals to show my class how this borax/glue slime slowly collapse and spread. This happens over the course of a few minutes and it gave me an idea. Is there any software out there that you could hook up your digital camera to and have the software take...

I'm working on a thought experiment and I have a question about trapping a pulse inside a looped preparation . If a pulsed particle beam is prepared with a definite energy(E), bandwidth(ΔE) and positional uncertainty/coherence length(Δx) is the pulse able to be trapped inside of a loop type...

I'm trying to make a small crystal radio and have managed to wire up the antenna and the head phone jack but I haven't got any diodes suitable for the voltages I'm using. I have some LEDs but will these dissipate too much current or cause any harmonics or interference with the signal?

(Go on easy on me, this is my first attempt and first course at control engineering) Homework Statement In systems who has a huge consumption of hot water, such as food factories, chemical industries or hospitals, it's customary to heat the water through fuel type "mazut". the hot water...

I require for a project a rotating stand, much like these... http://www.cokerexpo.co.uk/rotating-display-stand.htm ... Which are used in shops However as you can see they have some preset rotation speeds which have nothing like the accuracy that I will require. I need to control the speed of...

Homework Statement Identify 10 feedback systems that you encounter in your everyday environment. For each system, identify the sensing mechanism, actuation mechanism and control computation. Describe the uncertainty with respect to which the feedback system provides robustness and/or the...

How are cell membranes enlarged? What is known about how this process is controlled? How might I read more about this topic? I am mainly asking about animal cells.

Hello All, A friend and I took on a senior project design that is certainly proving to be more difficult than anticipated. Here are the details: Design Challenge: Self Balancing Motorcycle Description: A picture of our prototype is attached. The motorcycle is remote controlled with...

hello friends..i really need some help on my project, i am going to design a control system for a lawn mower..this mower must be able to move by itself using PIC as the brain,can avoid obstacle,move along path created on the field..what details component must i buy aand how to assemble this...

Hey everyone, I am an undergraduate mechanical engineering major considering a EE feedback controls course as an upper division elective. I have taken ME Control Systems and am also the Lab Instructor for it this semester. I am familiar with signals, filters, sensors, controllers etc. My...

hi member! i would like to have your ideas on how to program my microcontroler to input a specific value to the light bulb so as the brightness to be as specific as i require, if any fore circuit is also required,i'm here to accept and utilise ideas

Homework Statement The system is given by: G(s) = 1/((s+0.1)(s+3)) I need to convert it to G(z), it's discrete form. The sample time T is 0.1 seconds. Homework Equations To convert it they give G(z) = (1-z^(-1))*Z-transform[G(s)/s] The Attempt at a Solution Obviously I...

Hi guys, I am trying to put a series of differential equations into sate space form. The problem that I have come up against is that I end up with a differential in my B term (control matrix) and I am unsure of how to deal with this. Is there an easy way of doing this? Does anyone have any...