Help with a control maths formula

newie wrote: »

Electrical engineering exam Wednesday and need help on the following control formula if possible:

Lads there is a smart bunch here and Im looking for a second opinion on a question, Ive a formula:

TP = 3.14
(Wn ×√(1-ε^2 ))

and I want to get the formula reading Wn = , i.e I need to find a value for Wn and I have TP and the rest.

I think Im right but want a second opinion.

The formatting on boards doesn't help with these, you'd be as well finding an editor that can display the formulas exactly (OpenOffice has a Math [sic] program and Microsoft's offering has a plug-in I think) as you mean and take a screenshot (or draw it in a graphics package). but assuming it's just TP = pi over (W . root stuff), just swap TP and Wn (or, equivalently multiply by Wn/TP).

So you get (in OpenOffice format) W_n = %pi over {TP cdot sqrt {1 - %epsilon ^ 2}}, which renders like the first bit of this

newie wrote: »

was thinking that was it thanks.


Also if you could how do I get the roots of this equation.


8/ s(1.5s +2)

x1= ?
x2= ?

Ah come on, this is junior cert.-level stuff. Set it equal to 0 and solve the resulting quadratic equation.

IDCI wrote: »

Reckon you've just been trolled mate! :pac:

Either that or the engineering standards in college are drastically falling.