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Any ideas on the following Screenshot? The question is to stop the control valve at a postion so , the Piston stays at 0.8m where, 1m being the full stroke Length of the piston!http://files.engineering.com/getfile.aspx?folder=d98bc262-76b6-4689-8353-630417b3d278&file=Image_000_2011-11-19_16_58.jpg

ok here, posted.http://files.engineering.com/getfile.aspx?folder=187cadfc-c684-474f-9a55-0c4d490fa31b&file=hopsan_2011-11-17_new.hmf

I cant stabilize the directional valve to be open at a certain position and similarly I cant make the piston to be open at a particular position! I dont know what to do. Help any one?

I think MINITAB is awesome stats software!

Ok. I think I have managed to put the 2 Step sources correctly. But still the Piston opens completely. The reason is the directional valve opens completely. How to make it open just half way and it stays there....I have posted here since its a control problem. I see it as the Step Signal is...

Ok, this is what I did....When I use the second step as a +ve .8 value, the piston moves completely. But when I make it -ve 0.8 it just doesnt move....Screen shot belowhttp://files.engineering.com/getfile.aspx?folder=7eb82ab9-93ec-47ef-a881-4ccce5bcaed2&file=Image_000_2011-11-19_04_45.jpg

I forgot to paste link to file.http://files.engineering.com/getfile.aspx?folder=0408cbcf-dfb8-4a7c-b66d-14646961645f&file=Image_000_2011-11-18_07_49.jpg

What I am trying to do is in figure below, but then it still doesnt work. Is there a way to just completely shut off the Step Signal, once my piston reaches 0.8m. Yes, Hopsan works like AMESIM....and downloaded by googling it, the first link is download for Hopsan.

The System overview is as in attachment. The idea is to stop the piston before it reaches end position. Using just a Step Signal, it completely closes the piston.... http://files.engineering.com/getfile.aspx?folder=c745023c-595a-4fd5-87d9-1bd60a379aa2&file=hopsan_model.jpg

Well ok. Since people here have the idea about the system. The desired result is to stop the piston before it reaches end position in the software. This allows to reduce the high pressure buildup in the system as the piston is completely closed. Or in simple words, stop the piston after .8m, as...

lol, sure.... thanks i guess i ought to do that...

I cant use M.C in this simulation Software...

The program is Hopsan NG. If you google the name, the first link gives the download link.

I think the best way to deal with my problem is to use 1 step signal... But What I need to achieve is for 10 secs i need Amplitude as 5 and then drop it down to 3. How do i achieve this?

uC is?

I need the Step Signal for a certain time and then need to reduce it for a certain time and then once again so on... yes it is unusual. Is it possible to do something like this? I tried using Pulse but then Pulse signal completely goes down to zero and its of no use to me. tried Step with...

How to insert an extra Negative Step Signal in the Circuit Diagram to reduce the amplitude.

http://www.boschrexroth.com/country_units/america/united_states/sub_websites/brus_brh_i/en/products_ss/08_proportional_servo_valves/a_downloads/re29088_2009-01.pdf

2dye4 Its Hopsan Program. Download Location http://www.iei.liu.se/flumes/system-simulation/hopsanng?l=en I have made the equations but I need one thing to clarify For the calculation of Kce (the servo valve’s flowpressure coefficient) how do i find del qL (flow) / del pL (load pressure) Are...

2dye4 Its Hopsan Program. Download Location http://www.iei.liu.se/flumes/system-simulation/hopsanng?l=en I have made the equations but I need one thing to clarify For the calculation of Kce (the servo valve’s flowpressure coefficient) how do i find del qL (flow) / del pL (load pressure) Are...