Control Definition and 965 Threads

Hello, I'm having hard times with the following simple linear ODE coming from a control problem: $$u(t)' \leq \alpha(t) - u(t)\,,\quad u(0) = u_0 > 0$$ with a given smooth α(t) satisfying $$0 \leq \alpha(t) \leq u(t) \quad\mbox{for all } t\geq 0.$$ My intuition is that $$\lim_{t\to\infty}...

Hi everyone, I have a 24V, 15A D.C motor, and need to control its RPM. I know RPM is directly proportional to voltage, and so the answer lies in a technique to vary the voltage across the motor. I have looked into potentiometers, variable resistors, and pulse-width-modulation, but since I...

I have an air turbine, and it's critical that the motor speed be precisely regulated. It's very voltage-sensitive, so the fluctuations in the line voltage between 120-126 A make the motor speed too variable. How can it be regulated? A UPS might work. But it would have to output voltage...

I am looking to power a heater. According to the product specifications it will require 11.1V/26.4A to heat to 800C and 16.9V/33.1A to heat to 1000C. The manufacturer sells an expensive temperature controller which we would like to avoid using. It has been suggested to me that I use a variable...

Hi. I've just started working with the MPR121 capacitive sensor (at the moment I'm working with the MPR121 breakout board sold by sparkfun) for an application that involves detecting a toolhead's distance above a work surface. It's not a problem to ground part of the tool head and some initial...

If we were to introduced a set of un-entangled, but same polarized, photons as control experiment what would the results be of the control experiment? So we have the following three cases: Bell test Experiment: Send entangled photons Result is that P(-30,30) is not equal to P(0,30) + P...

I am trying to build a model of CANDU reactor core using a software called DYMOLA.For this purpose,I am trying to figure out a mathematical relation between coolant temperature and Power developed in a reactor.I have the following questions: 1.What is the effect of increasing the neutron...

I currently have available a 12V DC source and from that I want to power 3 LED strips but I want to be able to either have them all on at the same time, blink the strips in a pattern, or have them off. I have done some research into 555 timers but it looks like they won't be able to handle the...

http://abcnews.go.com/blogs/health/2012/05/23/epilepsy-miracle-diet-prevents-seizures-scientists-may-know-why/ It's been known for over a century that the ketogenic diet is effective but a lot of parents won't adopt it because it requires complete control of every meal. They opt to try and...

Hi all, I have a MIMO system which I have developed in Simulink and I have also work out the Model predictive control for it. Now I have a manipulated variable which I want to be used during night and remained turned off during day. I have tried but could not figure out how to do this in...

Homework Statement This question came up in a computer science / robotics exam and I still don't know the solution for it. I figured out that it's classical mechanics related, so I thought this might be the best place to ask it. Homework Equations C = A*x + B*dx/dtThe Attempt at a Solution I've...

I'm working on a unlimited time final exam. There is a problem that I have been thinking about for the last three days but I still couldn't get it. It is worth about 15% of the final and the final is 35% of my grade. I could work on the final for another 5 days before I turn it in. Now the...

Homework Statement I am supposed to design a control system with feedback and disturbance feed-forward, with all relevant transfer functions. The system consists of an oven where the temperature T is controlled by an electric heater that dissipates power P_{in}. The temperature outside...

Homework Statement C = 4 μF L = 0.2 Hy E is DC current. No internal resistance. Write an expression the the laplace plane transfer function, that relates current (that flows through resistor R) to the voltage E. (There is another question. I will just address the first one for...

Not sure if this is the right forum, but I'm an electrical engineer studying controls so here goes. Here's my background on what I know. Lead or lag compensators generally have the form C(s) = K*(s+z)/(s+p), i.e. the controller has a DC gain and introduces a pole-zero pair. In the case of a...

Homework Statement http://img543.imageshack.us/img543/7906/ddd2e.jpg To translate from Hebrew from left to right: Net Voltage 220 Vac, Pull Down Transformer, full wave rectifier (marked with a, b, c, d), below it is a "load" (or resistance), and to the right it says "a circuit to control the...

We use this plane called the "Laplace plane" to solve problem in control-engineering, second order systems. Can anyone help explain the Laplace plane in simple words? I find the wiki article too fancy for me... it says that it "is a mean or reference plane about whose axis the instantaneous...

Let's say I have the following transfer function: G(s)=\frac { s-1 }{ { s }^{ 4 }+2{ s }^{ 3 }+{ 3 }s^{ 2 }+{ 4s }+5 } Which is run through MATLAB to obtain the pole-zero format: G(s)=\frac { s-1 }{ ({ s }^{ 2 }+2.576s+2.394)({ s }^{ 2 }-0.5756s+2.088) } Using a quadratic solver...

Hey everyone, I'm brand new here, so please bare with me if my question doesn't come out right. Homework Statement So for my senior design class I am working with a control system that balances an inverted pendulum. Here is my SIMULINK diagram...

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'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...

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...

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...