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Accept 20 answers given by other contributors
Awarded to John on 17 Jul 2023
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Awarded to John on 20 Jul 2017
Feeds
Frage
How can a Simulink State Space block state be periodically reset?
In Simulink, can a State Space block's states be periodically reset, ie not just set on startup? If not, what alternative is t...
2 Monate vor | 1 Antwort | 0
1
AntwortFrage
How to run two Simulink models at different rates, in the same workspace?
Is it possible to run two Simulink models at different rates, in the same workspace? I'm looking to run two identical models (o...
2 Monate vor | 1 Antwort | 0
1
AntwortFrage
Discrete-time Simulink not matching Matlab Connect()
I'm trying to understand why my discrete-time Simulink feedback loops are seemingly far from Matlab's Connect() results. Per he...
2 Monate vor | 1 Antwort | 0
1
AntwortFrage
Discrete Derivative block (Simulink) behaves differently than expected
I'm discretizing a known-working continuous system model that includes x state outputs from the simulink Varying State Space blo...
3 Monate vor | 1 Antwort | 0
1
AntwortLQI with time-delay system
"Did you set the Pade order (for linearization) value in the Transport Delay block parameters to a positive integer? If not, th...
3 Monate vor | 0
LQI with time-delay system
"The location of the delay(s) will also have different affects on the closed loop I/O response as well if the delay is on the fe...
3 Monate vor | 0
Frage
LQI with time-delay system
Matlab's documentation mentions that state-space systems with dead-time (eg. plant or measurement delays) can be defined with ss...
3 Monate vor | 2 Antworten | 0
2
AntwortenHow to add disturbance feedforward to LQI()
Thanks Paul. My question was confusing because i grammatically misunderstood something you wrote :) Your latest explanation said...
4 Monate vor | 0
How to add disturbance feedforward to LQI()
1) I have more to ask later :), but was hoping to clarify Matlab nomenclature first, since that may change my questions... "Def...
4 Monate vor | 0
How to add disturbance feedforward to LQI()
Thanks @Paul, that's useful. I didn't know that signal paths could be turned on and off as you showed in sampleBlock. Very handy...
4 Monate vor | 0
Frage
How to add disturbance feedforward to LQI()
I'm seeing an issue where adding disturbance FF to an LQI system is not causing any performance increase -- even though in my Si...
4 Monate vor | 1 Antwort | 0
1
AntwortFrage
Standalone Application Compiler for OSX
I'm confused on the process for generating a standalone application for OSX, using Application Compiler. I've read all the docu...
9 Monate vor | 1 Antwort | 0
1
AntwortFrage
acker(): "Error using sym/poly". Why?
I'm trying to find the eigenvalues of a matrix H manually, where H represents some system dynamics. (The system is defined by ...
10 Monate vor | 2 Antworten | 0
2
AntwortenManually compute LQI() gains using Algebraic Riccati Equation / Hamiltonian
Thanks @Paul. Good point about being able to use place() as well. The main question was this one: Is there a better manual m...
10 Monate vor | 0
Frage
Manually compute LQI() gains using Algebraic Riccati Equation / Hamiltonian
I'm attempting to compile a Matlab program for embedded use, and that program also includes lqr() and lqi(). Since neither are c...
10 Monate vor | 2 Antworten | 0
2
AntwortenFrage
Simulink Switch doesn't propagate rate transition
How can I make a Simulink Switch to propagate rate transition? Right now I have two signal paths, of variable rates, with the r...
12 Monate vor | 1 Antwort | 0
1
AntwortFrage
Extra zeros added to a TF by zero()
I'm seeing extra zeros added to a TF by zero(). Here's a state space TF, in zpk form (for compactness, as the SS form is large ...
12 Monate vor | 2 Antworten | 0
2
AntwortenFrage
Commenting out Simulink block changes in unrelated system
I have an issue where "Commenting Through" a Simulink block semmingly changes the response of an unrelated system. Say I have u...
12 Monate vor | 1 Antwort | 0
1
AntwortFrage
Simulink Matrix multiply error: unexpected scalar signal mismatch
I'm confused by a Simulink error relating to a "mismatched port size". I have a scalar signal in a feedback loop -- the exact c...
12 Monate vor | 1 Antwort | 0
1
AntwortFrage
Step() not working as expected with USS state space (Uncertain Sys)
I'm trying to figure out what step() is doing with uss (uncertain) discretized state space equations, for 2nd-order systems. Th...
etwa ein Jahr vor | 1 Antwort | 1
1
AntwortFrage
How to tell if an object is an Uncertain state-space (USS) model?
I have a function that is overloaded, and takes both standard state space, and uncertain (uss) state space as inputs. Since c2d...
etwa ein Jahr vor | 1 Antwort | 0
1
AntwortFrage
Adding InternalDelay for State Space system
Say I have a closed loop feedback system sys without any delays, represented as a state space system. It was 2 inputs: reference...
etwa ein Jahr vor | 1 Antwort | 0
1
Antwortlsim() vs step() : are different responses expected?
@Walter Roberson Thanks for verifying. I thought it was the same directory as well, ie it seems like the matching function is ca...
etwa ein Jahr vor | 0
Frage
lsim() vs step() : are different responses expected?
Are different responses expected if running lsim() and step(), both with the same unit step inputs? I have a state-space system...
etwa ein Jahr vor | 2 Antworten | 0
2
AntwortenFrage
Discretize State Space feedback controller using c2d()
I'm looking to discretize a State Space feedback controller using c2d(), to find loop rate limits with which this feedback syste...
etwa ein Jahr vor | 1 Antwort | 0
1
AntwortIs there lqid() ? Lqr() has lqrd(), but I can't find lqid()
To answer my own question, after writing to mathworks: lqr() has lqrd(), but there isn't an equivalent for lqi(). lqi() is over...
etwa ein Jahr vor | 0
| akzeptiert
Frage
Is there lqid() ? Lqr() has lqrd(), but I can't find lqid()
Is there lqid()? Lqr() (continuous-time) has lqrd() (discrete-time), but I can't find lqid(). Is lqi() overloaded for discret...
etwa ein Jahr vor | 1 Antwort | 0
1
AntwortFrage
Change rlocus() axis units to Hz?
How can I change the plotted rlocus() real axis units to Hz, vs rad/s? I tried Property Editor --> clicking on X axis --> More ...
etwa ein Jahr vor | 1 Antwort | 0
1
AntwortFrage
Simulink error: Time-Varying State Space block
I have a Simulink error I can't figure out, relating to the Time-Varying State Space block dimensions. I'm using this block so...
etwa ein Jahr vor | 2 Antworten | 0
2
AntwortenFrage
LQG issue: state estimates always perfect
I'm working through an LQG controller for a simple 2nd-order spring/mass/damper system, using an LQR controller base. See my at...
etwa ein Jahr vor | 1 Antwort | 0
1
Antwort
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