I am a long time Mathcad and C programmer. In C one includes header files. Since many header files are often included, it is possible that a variable or function has been defined before so there is a test to see if the variable has been defined before, so it doesn't get redefined.
In Mathcad I...
https://www.fluidpowerworld.com/pressure-makes-it-go/?spMailingID=75597&puid=738988&E=738988
Force makes it go!
I have spent years trying to teach them.
Akkamaan can verify this.
Newton did not include flow or pressure in his 3 laws of motion.
It takes a net force to make something accelerate...
The title says it all.
I am still on Mathcad 13 and I have 35 years of Mathcad files that need to be pretty printed.
Mathcad 13 can only generate fixed pixel images.
Peter Nachtwey
Delta Computer Systems
http://www.deltamotion.com
http://forum.deltamotion.com/
IFPS Hall of Fame Member
I know there are some real professorial power guys out there.
For those that aren't, IFPS is the International Fluid Power Society. Yes, it is some what international since people outside the US get inducted into the IFPS Hall of Fame.
There are a few different certifications but in general...
https://www.iso.org/standard/12740.html?browse=tc
The abstract.
https://www.iso.org/obp/ui/#iso:std:iso:6403:ed-1:v1:en
This document cost money and I don't know if it covers what I am interested in. The title is not very specific.
I need to know if it covers hydraulic servo valve testing for...
I have retired. I have over 25 years of Mathcad files that reside on a WinXP virtual machine.
I need to make this available to someone at the company.
I could just leave them the virtual machine.
Another option is to upgrade the old Mathcad 13 files to the latest Mathcad Prime.
The problem I...
I like Mathcad's ability to convert between different units but some times it is nice to remove the units. I know that dividing by the units will work but that is kind of a kludge.
A simple ru(var) function would be nice. Then one can do this
var_unitless = ru(var_with_units)
I have spent too...
The video shows how a non-linear valve can be modeled.
The same program works with linear valves too.
My problem is that I don't have a HPU big enough to really push the valve at higher frequencies.
https://deltamotion.com/peter/Videos/ValveID.mp4
I wonder if hydraulic design will ever become...
I have written a hydraulic sizing program for servo hydraulics. It calculate the minimum cylinder diameter, valve size, hpu size and accumulator size.
The units can be changed from metric to imperial. The values calculated are minimums. The minimums are not usually available so the user...
Controlling difficult systems
https://youtu.be/FxkCQV-GJIA
Controlling under damped systems
https://youtu.be/o3jR9r512Ho
Does anybody look at these?
Peter Nachtwey
Delta Computer Systems
http://www.deltamotion.com
http://forum.deltamotion.com/
Another hydraulic servo control webinar.
Some people have found these very good training while sheltering in place.
https://youtu.be/tzQXAFKgSmY
Peter Nachtwey
Delta Computer Systems
http://www.deltamotion.com
http://forum.deltamotion.com/
A YouTube video of a recorded webinar about hydraulic testing applications
https://youtu.be/AHdH5t88c2A
Our customers do a lot of hydraulic testing. We have a National Instruments VI that allow easy integration between NI Labview and our controllers. Together we compete against MTS.
Delta...
Backgound,
I have a small eaton-vickers pump that looks almost like this only mine is green.
It has a 5 HP motor driving a 5 gpm pump at full flow.
https://www.youtube.com/watch?v=81nzCdIX1aw
We no problems with setting the system pressure at about 1500 psi when there is no flow. We can't...
https://forum.deltamotion.com/t/april-22-2020-delta-hydraulic-cylinder-tuning/734
This is very basic. I tend to be a little more geeky.
Over 200 people attended this webinar.
Peter Nachtwey
Delta Computer Systems
http://www.deltamotion.com
http://forum.deltamotion.com/
I am looking for a table of standard cylinder sizes, bore and rod diameter for mm and inches.
I have found a table of ISO/metric cylinder sizes but it doesn't seem to cover cylinders with a bore over 200mm
The same goes for US/British units.
The ISO sizes do seem rather consistent with two...
We are testing 0.1 micron Temposonic rods. This will provide us 0.1m/s^2 acceleration resolution when sampling at 1 millisecond.
Peter Nachtwey
Delta Computer Systems
http://www.deltamotion.com
http://forum.deltamotion.com/
https://youtu.be/u3L8vGMDYD8
This robot is made by Omron
Can Curt Wilson tell us any more?
Peter Nachtwey
Delta Computer Systems
http://www.deltamotion.com
http://forum.deltamotion.com/
If you do a search for CTM PID you will find many links that point to about the same data on different universities websites. The link I will use is this one
http://ctms.engin.umich.edu/CTMS/index.php?example=Introduction§ion=ControlPID
They are similar with the layout changing a bit.
In...
There will be much where I support what Jack Johnson has done but there will be differences.
Jack Johnson is an educator that has written many books.
I am more practically orientated. My company has sold over 100,000+ hydraulic controls.
If you haven't figured out so far, I can do math and...
Why do I ask?
I was on a Chinese hydraulic servo forum. There is an on going dispute about different kinds of servo control. The problem I have is that no one understands Laplace transforms.
I can show the relative strengths of PID, PD, PI and P only control using Laplace transforms but no...
