Search results for query: *

Can anyone tell me how I can define my P I and D parameters in Simulink. If I change my parameters of my PID-regulator, my proces value graph changes very much with each change of PID values. I tried to use Ziegler Nichols but it gives very bad results. I need to know a method how I can...

Hello, I have a question. How can I simulate a linear actuator? This actuator gets a signal between 4...20 mA and it takes 6sec to open the actuator complete. So for example, if I have a signal of 12 mA and i go to 20 mA it should take 3sec to go to that value. How can I build such a model...

hello, I have a guestion. Different producents of valves give the flow caracteristics for Kv values. I need to kwow if these caracteristics stay the same if i use air as medium. Example: if i have a linear flow caracteristic for %opening of valve versus %Kv, does the caracteristic stays linear...

In Simulink.

Hello, I need to simulate the working of a control valve (all kinds of valves) and then I need to analyse the results of the different types of valves to choose the perfect one for my application. So I thought to simulate a constant flow, then the caracteristic of the control valve, and at the...

The volume at the inlet of the compressor remains constant, but the mass increases because of the increase of density. Now I want to know the relation that the flow through the compressor becomes greater because of an increase of density. The reason is because the compressor compresses the...

Hello, I'm looking for an equation which shows a relation between the fact that when the density of air becomes larger the flow through a centrifugal compressor increases For example: the flow increases with a factor 1.15 from 35°C to 5°C. This is with constant pressure of the compressor...

Hello, The flowrate is 7000 m3/hr and the inlet pressure is 7 bar I hope this is helpful. And yes, I work with an air system

Hey, I have a question to anyone who can answer me. I need to choose a valvetype which fits the most in my application and why. I have a compressor who delivers a constant flow. On the other side I have clients who use a variable flow but NEED a constant pressure. I need to place a valve in a...

Hello, can anyone tell me the Kv equation for air. All the equations are for water and I would like to calculate it for air. And in the equation the term DeltaP (pressure drop) what does it stand for. Is it a property of the valve itself and how can I find the term??? Thanks a lot