2 replies to this topic

[ydtuerah]

Hello everyone.

 

I need some help in modelling a fluid tank into Laplace domain. The system looks like this:

 

http://blog.opticont...ol1-300x161.png

 

but the difference is that I don't have a pump at the bottom of the tank (the liquid flows directly by means of gravity and pressure). Also, the input feed can be considered constant. Thus the level in the tank is controlled by the control valve at the outlet of the tank. 

 

 I've tried searching some materials concerning this topic, but I can't find any material that discusses the height of the tank (output) in regards to the opening of the control valve (or the outflow rate as input). Is there anyone who is able to help? Thank you

[Said Salim]

Dear ydtuerah,

This link might help you regarding your topic..

http://eleceng.dit.i...ling a Tank.htm

[ydtuerah]

thank you for the reply. In the link you gave, the transfer function assumes that the outflow is dependent on h(t) and R (and R is a constant). But in my case, the R may change due to the opening percentage of the control valve. That's the problem that keeps me confused.