Recent content by Electest

Thanks Gneill, I appreciate your input.

Hi Gneill Thanks for the reply. I questioned this as every textbook I read always stated specifically R and C in series. I was initially using my textbooks by John Bird to understand this concept. The question states in relation to the diagram at the beginning of this thread Using the values...

I came across this thread this morning and it has confirmed my thinking for both Q1 and Q2, however I'm not 100% about Q3 I fully understand that for steady state, the time constant (t)=R*C times a multiple of 4-5 in seconds, but this is always shown for a capacitor and resistor in series, not...

Ok, but how is that helping me sketch the graph [emoji53]

Sorry a few typos above. Don't know how to edit. Undamped natural frequency (wo)

Yes, I also understand that too. I guess the formulas I'm using are only valid for values up to zeta=1. I think that, what I'm currently studying only scratches the surface of this subject. Why I've questioned this and because they don't just give you a value of Zeta, but also include a value...

No, and I can see that clearly on many graphs on the subject.

I know that they only say sketch, but they give you values of zeta and wo, which can be used to calculate: 1. Delay time, Td2. Rise time, Tr3. Peak time, Tp4. Maximum overshoot, Mp5. Settling time, Ts Which is fine for the first 2 lines, which are under damped (zeta=<1), but have throw in the...

Hi Gneill/Gremlin I've had a good read of my learning material and done some googling, so trying to mate sense of it I was calculating Td , Tr , Tp , Ts and Mp, to sketch my graph, which was fine for ζ less than 1. I realized that things wouldn't be straight forward as β = cos^−1 (ζ ) I have...

Unless it's complex??

Hi Gneill I've been looking at this and was trying the following ωd = ωo*SQRT(1 − ζ^2) Where wo= 1x10^3 and ζ=2 But you can't SQRT a negative number 1x10^3*SQRT(1-2^2) 1000*SQRT(-3) Any pointers Thanks

Hi RM, away for the bank holiday, but will take a look on my return. It's quite an interesting question.

Brilliant, look forward to it

How did you get on RM? I've looked at various websites to establish how things work with excel, but they all have different answers, so am curious how your assessment went.

I'm wondering if the coefficients calculated by excel (Nzn) should be divided by N to give us zn, before entering into column C. What you think?