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1answer
54 views

Identification of the system with zeros

I need to identify two systems. Those are their Unit Step responses: I don't know, what order of the system that is. It could be second order system with zero in 0. Lecturer told me it was third ...
0
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1answer
64 views

Logarithm in state space equations

I want to linearize a system to this form $$\begin{bmatrix} \Delta\dot{x}_1\\ \Delta\dot{x}_2\\ \Delta\dot{x}_3 \end{bmatrix} = A\begin{bmatrix}\Delta x_1\\ \Delta x_2\\ \Delta ...
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0answers
22 views

Estimating Model Weights for Point-Process Input/Output Systems using Probability Theory

Problem: I have a point-process input & output, x & y and I am attempting to estimate a 2nd order nonlinear Volterra-like model for them in the form: $$ Eq. 1: y[t] = k_0 + ...
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0answers
24 views

How I calculate to system identification of shear building with wavelet?

I have a 3 story shear building and I excited with acceleration and then taken displacement of stories with SAP and then. I want to calculate the frequencies of system with wavelet. I attached my ...
0
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1answer
36 views

choosing an input signal for system identificaiton [closed]

I know we can use a -step -impulse -sinus -multisine -random phase multisine To identify a system. But what are the advantages/disadvantags of each type of ...
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0answers
26 views

Using output error model to model colored noise (using a prefilter)

I have a "black box" SISO system. I use zero input to measure pure noise on the output. After preprocessing (peakshave and removing DC) I try to model the noise using AR (and also ARMA). When ...
1
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1answer
83 views

Periodogram: an inconsistent estimator

What is the reason that a periodogram is not a consistent method for obtaining information about frequency response of a system? To be more precise, why even after increasing number of samples ...
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2answers
2k views

What are Lumped and Distributed Systems?

What is the exact difference between Lumped and Distributed systems? Also, Lumped systems are said to be ordinary differential equations while the latter is said to be partial differential equation. ...
3
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1answer
128 views

What are some suitable methods for removing low-frequency line noise from measured data prior to system identification/deconvolution?

I am performing a system identification by striking an experimental model with an instrumented impact hammer and measuring the strain response. The timebase for the recorded signals is 5 microseconds ...
1
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1answer
273 views

Comparing multiple armax models

I would like to create an algorithm that, given an iddata, estimates different armax models with different na, nb, nc, nk, and finally it show the compare plot. I know how to use the armax ...
4
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2answers
2k views

How can filter data to remove noise in matlab?

I have 2 arrays of 800000 input and output data samples. The system is a kind of oven that works among 0 and 10 volts. The sample time is 0.001s. I have to identify the model of this system, but ...
3
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1answer
83 views

Is this input function time varying?

I'd like to understand when an input signal is time varying or time invariant. Specifically, I have this function: $y(n) = x(n) + 0.1 + (0.2)^n + x(n-3)$ I thought that this is time varying because ...
3
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1answer
121 views

How to perform model fitting for system identification

I am having a really hard time in understanding how to formulate a model say linear AR model to represent a communication channel or maybe any motion. I have the experimental data representing the ...
6
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0answers
90 views

Estimating the input to a system from a system state using EKF

[ Cross-posted from: http://math.stackexchange.com/questions/164169/estimating-the-input-to-a-system-from-a-system-state ] I have a system for which I have obtained a non-linear time-varying ...
12
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1answer
161 views

Deconvolving the measurement system from the system response

I'm preforming a system identification measurement, and would like to deconvolve the measurement system's response from the measured response. The set up of the system is as follows; the signal is ...
6
votes
3answers
314 views

choosing drive signals for system identification?

(I'm just learning a little about system identification so apologies in advance if this question is badly worded) How do you go about choosing drive signals for system identification? I've seen PRBS ...
5
votes
1answer
121 views

State space system identification

Suppose I have a real (physical) dynamical system with some sensors and actuators, and I also have an idealized state-space model of this same system. How, in general, can I adjust the model to match ...
7
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1answer
789 views

System identification packages

I've been hunting around for an alternative to Matlab's System Identification Toolbox, but the commonality of the terms "system" and "identification" are confounding the search. Are there any ...