I am using simulink to model a process with time delay, compensators and MPC controller.
Problem is when I hit the Simulate button I get this error:
MPC: Utility: Kalman1, Message = Problems encountered when designing the overall state observer(Kalman Filter).
The overall system has unobservable modes in z=1
The overall system Transfer Function is:
0.2713 z^4 - 1.755 z^3 + 4.05 z^2 - 3.919 z + 1.353
--------------------------------------------------------------
z^7 - 6.21 z^6 + 11.57 z^5 - 3.192 z^4 - 8.476 z^3 + 5.311 z^2
Can anyone help with this error?
Thanks
Related
I keep getting the error below:
Continuous state '1' of 'untitled/Battery/Model/Current filter' at time 0.00010049124961226976 is not finite. Simulink will terminate the simulation. There may be a singularity in the solution. Check the model 'untitled' for errors. Try reducing the fixed step size or tighten the error tolerances for variable-step solvers.
The image of the model is as below:
https://i.stack.imgur.com/zkCBl.png
https://i.stack.imgur.com/mVzr6.png
https://i.stack.imgur.com/2cDOW.png
I would need more information, but have you tried changing the solver parameters?
Usually with block from sympowersystems (or similar) I have better numeric performance using a stiff solver, like ode23tb.
To do so, go to your Model Settings (Ctrl + E), go to Solver, Select Variable Step Solver and in the droplist select ode23tb.
I'm designing DSS System, the problems is when I execute it this error occurs:
Error in 'DSS_System_withANFIS/Synchronization Unit/Acquisition/Integrate and Dump1': All sample times for this block must be discrete. No continuous or constant sample times are allowed.
Here is my overall system design:
and this is my acquisition subsystem of Synchronization unit:
The error occurred at integrate and dump unit.
Any help?
I found the solution.
I just changed the solver to discrete in configuration parameters in simulink UI
I have two model references - Slow model and Fast model, each running at its own rate for concurrent execution on the grt "generic real time" . However when I attempt to build the block I get the following error:
Simulink cannot generate code for the signal at output port 1 of block
'Multirate/Fast' because the signal requires data transfer that
generates lock-free code for a rate monotonically scheduled task.
I am not sure what to configure in simulink to overcome this error. I attempted to add rate transition from the Fast model to the Slow model but the error remains.
Any thoughts
Since there are many possibilites I can't give you a simple answer but you can try the following:
Check if simulink can determine your sample rates... Did you configure that correctly (go to view and set sample rate colors) then you see if Simulink detects the execution times correctly.
If your Simulink Block ('Fast') is contained in a single subsystem make it an atomic subsystem... an configure the sample rate on the subsystem properties.
Set the strictest constrains in the rate transition block...
How is your Model configuration? is it set to multitaskig....
I'am trying to speedup my simulink project and want to use the Accelerator-Simulation mode.
The aim of my project is to control a cyclic process and is structured as followes:
matlab-script, where all parameters and a feedforward control with
parameter estimation is implemented. Also it starts simulating the
simulink model for each iteration.
simulink model, where the dynamic system and the feedforward control (basically a lookup-table) together with a feedback control
is implemented. Parameters of all blocks are set by workspace variables/structs generated by the script.
The feedforward control variable is calculated and parameter are estimated from the simulated data after every simulation pass. Then the model is simulated again. The model is not changing during the iterations, but still it is compiling at every cycle. From the first: Is this solution appropriate for using the Accelerator mode?
I tried to follow theses proposed steps to determine, why it is built at every iteration: mathworks
If i run it with the Accelerator-Mode (referring to the documentation of this function, it now compiles for simulation), I still cannot reproduce why it is compiled at every iteration.
csdet1.ContentsChecksum.Value ~= csdet2.ContentsChecksum.Value
is true, but the proposed code does not find any details.
csdet1.InterfaceChecksum.Value ~= csdet2.InterfaceChecksum.Value
is also true, the proposed code outputs that
UserDefinedTypesChecksum
is different. What does that mean and how can I resolve this?
Sidefact: When I run Simulink.BlockDiagram.getChecksum() with the Model opened in Simulink and Normal-Mode chosen, I get this error:
Continuous update specified for this chart chartname This is not
supported for RTW."
But this chart is a Matlab-Function block, not a stateflow chart?!
I try to generate code with the embedded matlab coder from a Simulink model.
Then this error occurs: Unable to honor user-specified priorities.
It seems to me that this algebraic loop triggers this error. As you can see in the picture below, there are a higher execution-order at the sum as at the integrator.
I changed the continuous block integrator to an discrete, I put a memory block in the back-path, also an unit-delay-block. But nothing lead to success.
I hope you can give me some approaches to find out a workaround.
Regards
Alex