"We are going to make an example hydraulic servo actuator project that those with the demo version of 20sim can load. Unfortunately there will be a lot of parameters to modify. I will post it on our FTP site when we are done. That way those with BathFP can compare."
Sounds good, I'd like to...
You can get it from:
http://ca.geocities.com/hchesser@rogers.com/pc_bathfp.zip
its the previous (alpha) version, not the version that everyone is waiting for...
For tube capacity, the correction for bulk modulus is the same as for the cylinder. I found the correction formula in the Keller reference on pg. 63. As PNachtwey points out the hydraulic capcitance is volume/(effective bulk modulus), with the effective modulus corrected to account for tubing...
PNachtwey,
I believe the capacitance of the hydrualic line is related to the stiffness of the line - just as an electrical capacitor stores charge/voltage, the hydraulic line stores pressure by expanding (like your cylinder). The line stiffness is related to the material (as well as diameter...
PNachtwey,
I looked at your previous posts and see that you are thinking of making this into a web-based tool. I like that as an idea - here are my thoughts as to how to go:
- on the technical side, I do think you should explore the parameter space of the model to see what are its limitations...
Well I finally got around to modifying the BathFP analysis so that I could reflect the same initial conditions as the analysis in PNachtwey's post.
The updated inputs and outputs can be found at:
http://ca.geocities.com/hchesser@rogers.com/Ex-Eng-Tips2.pdf
Overall the results are much closer...
Thanks, I thought it was useful for me anyway.
1. Regarding the 35 bar vs. 70 bar - I saw your dp/2 equation but thought the software was asking for the full drop across the valve. I think you're right though...
2. Unfortunately the profile you can enter is limited to 10 steps, so I couldn't...
I thought it might be a useful exercise to try to run PNachtwey's servo-valve example using the PCBathFP software.
A summary of the simulation and comparison of results is at:
http://ca.geocities.com/hchesser@rogers.com/Ex-Eng-Tips.pdf
I found that the analysis basically confirmed what...
I've recently purchased a copy of "Industrial Hydraulic Control", Peter Rohner.
It seems to be a pretty good text and not connected to any hydraulics manufacturer either (it is connected with the www.hydraulicsupermarket.com web site, though). It may be a little above my students in basic...
frans,
Yes, I've tried the "support" and its definitely not the fastest. But for a free tool, that's to be expected.
Have you tried the simulation capability? I've tried a simple example involving an unloaded hydraulic motor, pressure-compensated throttling valve and counterbalance valve and...
I've taught a course using the Parker Industrial Hydraulics Technology manual by Parker. I agree, its not the best written book I've seen.
The college where I teach the course has a number of the Parker training stations. I find the students learn alot just from putting together the...
Has anyone tried the free PCBathFP software for hydrualic circuit simulation?
I teach basic hydraulics and have gotten the students to use it to creat basic hydrualic circuit diagrams. I'm thinking of incorporating some basic simulations as well into the course. As someone previously posted...
