Hi MATLABdude,
That is the problem. I have tried that before but it generates the following error:
"??? Cell contents reference from a non-cell array object."
Do you have any resolution to the above error?
i understand that the "nyquist" command in matlab requires one to key in the transfer function..
however, i am stuck here as i am unable to form a transfer function from the following numerator and denominator:
num = s-3/2-1/2*(-24*s+1)^(1/2)
den = 1.25*s^2 +3.75*s + 2.5
i know that...
Homework Statement
A separately excited DC motor with 220V, 970rpm, 100A and Ra=0.05ohms. It is braked by plugging from an initial speed of 1000rpm.
I need to calculate i)the resistance to be placed in the armature circuit to limit braking current to twice the full load value, ii)the...
Oh so sorry, i thought what i have given is the general representation of a state space equation, where x is the state variable, u is the input and y is the output. and yes, "x(dot)" is the derivative of x with respect to t but y is just y.
Hi,
given the state equations of a system,
x(dot) = Ax + Bu
y = Cx
is the impulse response function of this system C(e^(At))B? If not, how can i identify the impulse response from a given state equations? Please advise. Thank you.
i need to convert my transfer function to t-domain format and then plot the graph of the equivalent t-domain equation. i am using the ilaplace function to convert the s-domain transfer function to the t-domain equation.
my code is
>> f = (s + 3.1)/(s^2 +3.1*s + 2.23)
f =...
Hi lanedance,
Thank you for your reply. I confused myself and is able to get the answer already.
The problem was that i have this A1 2x2 matrix, e.g. [1 2; 3 4] and i have another A2 1x1 matrix [5]. I wish to add them together, i.e. A = A1 + A2. At first i thought that the size different...
i have two sets of state equations:
1) x(dot) = (2x2)x + (2x1)u
y = (1x2)x
2) x(dot) = (0)x + (1x1)u
y = (1x1)x
given the above, since A, B and C are of different sizes, how can i add the A from 1) and 2) to get a combined A? Is that possible? Please advise. Thank you.
Hi rock.freak667,
sorry i don't get you. do you mean shift the disturbance D(s) to the left of G1(s) as in in the block diagram?
or do you mean the equation Y(s) - G2(s)D(s) = U(s)G1(s)G2(s)?
please advise. thank you.
U(s) is my input, Y(s) is the output. I have two plants, G1(s) and G2(s). Between these two plants, i have a disturbance input, D(s).
Am i right to say Y(s) = U(s)G1(s)G2(s) + G2(s)D(s)?
If that is the case, how can i get the overall transfer function Y(s)/U(s)? Please advise. Thank you.