Anything that would change the velocity. That requires acceleration and that requires force which requires pressure. Obstructions will cause this. Do you have an encoder on the motor, even a tachometer a would be good as long as it as be recorded. Instrumenting things can get expensive real...
I have seen this when the over hauling load is traveling fast and the valve is shut quickly.
Good data will help find what is wrong but one should record much more than just the pressure. Other things that might be important should be recorded too so it is easy to see a correlation...
Since no one has come up with a solution.
Our cheapest analog motion controller can to that easily but it will blow your budget. It can capture data at rates as short as 250 micro seconds and can be configured to trigger on events so when the pressure spike occurs, you won't miss it an the data...
You can get a HMI for that price. I doubt you will get a sensor and HMI for that price. The HMI will not have any data logging.
The Raspberry PI, analog "hat", display and sensor wil probably cost more than $500 and then there is "some assembly required"
I doubt you can do what you want to...
What is the vessel filled with before starting?
What is the volume? At sea level air weighs 1.225 kg/m^3
One could measure by the weight change using the density and pressure. This assumes there is only one type of gas inside.
https://en.wikipedia.org/wiki/Density_of_air
Peter Nachtwey...
@FluidPowerUser. I have a YouTube channel called Peter Ponters PID. It is advanced and covers many topics not just hydraulics. You better be up on your Laplace transforms and differential equations. I cover motor, temperature, level control too.
I could teach control theory. I just happened...
It looks good but what are you going to do with the stiffness value? I usually compute the natural frequency.
Peter Nachtwey
Delta Motion
http://www.deltamotion.com
http://forum.deltamotion.com/
IFPS Hall of Fame Member
Few in the hydraulic world have even figured out the control theory for controlling hydraulics. You won't find it in a book. Buy a hydraulic motion controller unless the system is very basic. A simple PI or PID control is not enough.
Me neither.
I/we have solutions but without info we can do...
I agree. A boom is not a rigid structure. The natural frequency will change with load changes and boom extensions. Bang-bang valves may induce oscillations. So will rapid acceleration or deceleration attempts with a proportional valve.
The required motion appears to be very slow. Is there...
I am responding to the poor tracking. Kp*(0-act_vel) subtracts from the control signal all gthe time. Kp*(tar_vel-act_vel) does not. If the actual trajectory is following the target trajectory the change in control output is zero whereas the P and D gains subtract from the control output on...
Feedback is negative!
A simple incremental PID is
u(n)=u(n-1)=Ki*(tar_pos-act_pos)+Kp*(tar_vel-act_vel)+Kd*(tar_acc-act_act)
An I-PD is the same but the tar_vel and tar_acc are set to 0 because the Kp and Kd act only on the feed back state, not the target...
Now I see what you are getting at.
The closed loop gains can interfere with the feed forwards if the closed loop gain is only used in the feed back path ( act only on changes in the actual position instead of the error ).
Simply put, there are different forms of PID.
The 22 Dec picture shows a...
I am here now.
I am going to use motion control as an example.
The output due to feed forwards are generated by mulitpying the target speed by the velocity feed foward and adding the target acceleration by the acceleration feed forward gain. Our motion controllers also add the target jerk x the...
@samirhyatkhan. I will try the trial versions. I have over 800 Mathcad worksheets. I have been using Mathcad since version 3. It is the devil I know. I am retired now. The problem is that no one where I used to work wants to get into the math so I don't know how useful it will be. At this...
I find Maple Flow interesting, but I stopped upgrading Mathcad at version 13. I would be interested if Maple Flow can import Mathcad 13 files. I still use Mathcad but try to do more in python.
Peter Nachtwey
Delta Motion
http://www.deltamotion.com
http://forum.deltamotion.com/
IFPS Hall of...
There are now simple formulas. I use a simulator. If necessary I can simulate the motion of two actuators running asynchronously but usually two are running in tandem so it is simple...
How precise does this need to be?
What to you mean by capacity? When you use the word push I think of force.
Are you really trying to control force? In this case force = pressure1*area1-pressure0*area0.
Even if you vent the exhausting side there will still be atmospheric pressure opposing the...
way back I did a simulation for the department of energy. It was about fuel injection for a diesel. Some of the fuels they were experimenting with would compress a lot. These light fuels would enter a diaphragm pump at 150 PSI and be injected at 40,000+ psi into the fuel header for the...
It would really help to know what it is.
You need to know how many parameters are significant to your model. Then be able to write the differential equation.
First I would use system identification to find the values for the parameters of your model. If the system is SISO then a file of...
I don't understand the problem. I used to write parts of magazine articles in Mathcad and then import them into Word.
In Mathcad 13 I could export worksheets in .rtf format. The rtf needs to be messaged at bit.
THe problem I had with this is that the pictures were of a fixed size and couldn't...
