Peter Nachtwey
Member
http://www.controleng.com/single-ar...c-controls-for-runway-testing/e17b8b3882.html
Someone else on this forum was involved in replacing the drives that move the machine up and down the rails. I have driven that machine although it is no big deal since it can only roll on the tracks.
The hydraulic motion controllers are controlling the force on the runway in an effort to quickly see how a runway will wear out and how to make better runways.
This project was very complex but it worked the way I thought it would until we discovered that the whole contraption flexes. Then we had to get a laser measuring device to detect the flex of the fram.
I can explain more if anybody is interested.
http://machinedesign.com/hydraulics/electrohydraulics-drives-engine-research
The department of energy was trying to make their high pressure fuel injection system work for two years. What they didn't realize is that the hydraulic designer had screwed up the design terribly. I should have been consulted on the original design. However, I was paid for 15 hours to simulate the system. There were about 30 simultaneous linear and non-linear differential equations in the simulation. I was able to tell how the system would run and predict the gains so the system did work. What was good is that the Department of Energy used Mathcad. Since they paid for the simulation I gave them the worksheets so they can do their one predictions, modelings, and estimates in the future.
I have many more. Most of the controllers we sell are installed without any problems. There is always the 2% that are mostly due to poor mechanical and hydraulic design. Of those about 1 in 50 is just a difficult project that requires lots of real engineering where the customer or original designer is over their heads.
I am a math, physics and control geek ok? I can program PLCs but it isn't what I like to do. I prefer look at the bigger picture getting into the physics of the system and algorithms required to control them.
Someone else on this forum was involved in replacing the drives that move the machine up and down the rails. I have driven that machine although it is no big deal since it can only roll on the tracks.
The hydraulic motion controllers are controlling the force on the runway in an effort to quickly see how a runway will wear out and how to make better runways.
This project was very complex but it worked the way I thought it would until we discovered that the whole contraption flexes. Then we had to get a laser measuring device to detect the flex of the fram.
I can explain more if anybody is interested.
http://machinedesign.com/hydraulics/electrohydraulics-drives-engine-research
The department of energy was trying to make their high pressure fuel injection system work for two years. What they didn't realize is that the hydraulic designer had screwed up the design terribly. I should have been consulted on the original design. However, I was paid for 15 hours to simulate the system. There were about 30 simultaneous linear and non-linear differential equations in the simulation. I was able to tell how the system would run and predict the gains so the system did work. What was good is that the Department of Energy used Mathcad. Since they paid for the simulation I gave them the worksheets so they can do their one predictions, modelings, and estimates in the future.
I have many more. Most of the controllers we sell are installed without any problems. There is always the 2% that are mostly due to poor mechanical and hydraulic design. Of those about 1 in 50 is just a difficult project that requires lots of real engineering where the customer or original designer is over their heads.
I am a math, physics and control geek ok? I can program PLCs but it isn't what I like to do. I prefer look at the bigger picture getting into the physics of the system and algorithms required to control them.