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Modelling of countercurrent exchanger

Hi, I need to model a countercurrent shell-tube exchanger with slightly more accuracy than usual. The model has to resp...
5 comments posted 18yrs
posted by bxvarley
5 comments posted 18yrs posted by bxvarley

Steady state error

For unit-step, ramp, parabolic inputs, we can estimate the steady- state errors. But how to estimate the steady-state e...
6 comments posted 18yrs
posted by ken.sofin
6 comments posted 18yrs posted by ken.sofin

PROTECTED BLOCKS OF SIEMENS

CAN U HELP ME OUT TO BREAK YHE PROTECTD BLOCKS IN THE SIEMENS
0 comments posted 18yrs
posted by kalburgikiran
0 comments posted 18yrs posted by kalburgikiran

Optimal control - LQR problem

Hello, I'm reading an introductionary article about LQR controller design. In the article is stated that goal of LQR is...
10 comments posted 18yrs
posted by asim.vodencarevic
10 comments posted 18yrs posted by asim.vodencarevic

Questions of SFCs

I've done both PLC & DCS programming over the years, doing both ladder and function block programming, but I've never b...
2 comments posted 18yrs
posted by mj.hamill
2 comments posted 18yrs posted by mj.hamill

B&R Automation OR Lenze Gerit?

Hello! I'm an italian brand-new graduate, and I've got a question: as an application engineer, is better working with B&...
3 comments posted 18yrs
posted by simon_balestrazzi
3 comments posted 18yrs posted by simon_balestrazzi

Siemens S7 200

Help: Ihave a plant that has a bunch of S7-200 plcs and they are all password protected from the last guy i am told. I...
3 comments posted 18yrs
posted by jmeyer
3 comments posted 18yrs posted by jmeyer

Solenoid Valve

I'm looking for a 3 way SST diaphragm solenoid valve. I want it to be direct acting with a 24 VDC coil. I'd also like i...
3 comments posted 18yrs
posted by dfroell1
3 comments posted 18yrs posted by dfroell1

nonlinear non minimum phase system

I know some basic principle of the minimum phase system concerning the linear system, however, I cannot understand why...
0 comments posted 18yrs
posted by liuauto
0 comments posted 18yrs posted by liuauto

PID Control on Micro with PWM

I am trying to use a micro to control a pump and I intend to use a PID controller for this. Here is what I have 1. I ha...
5 comments posted 18yrs
posted by query_me2001
5 comments posted 18yrs posted by query_me2001

Servo motor control

Can anyone link me to some good sites or papers about servo motor control. Thank you
2 comments posted 18yrs
posted by incubus
2 comments posted 18yrs posted by incubus