Recent content by CalebP

Ok I don't know what I was doing. My algebra must suck. I finally just grabbed all 6 equations and solved it online: 1 0 -1 0 0 0 0 0 1 0 1 0 0 5 0 0 6 3 0 0 7.5 0 0 0 0 3 -3 0 0 0 1 0 -1 0 0 0 0 1 0 0 -1 0 This gets me all reactive forces = 0 besides two vertical reactions...

For the structure overall the sum of the forces do not equal zero. In the x-direction my calculated reactions are 0.833, -0.833 and 0.8333 at A, B and C respectively. I have 4.167, 0.833, -0.833 at A, B and C with a -5 force also. So my equations are satisfied on each side, but overall they do...

The way I have it set-up up, the LHS has 3 unknowns as Rby = Rbx (or Rb@45deg).. Forces in x: Rax = Rbx (=Rby) Forces in y: 5 + Rby = Ray Moments about B: 5*1.5 = 6Rax + 3Ray That gets me 4.166 in the y-dirn and -0.833 in the x.. So the final resultant at A would be 4.249kN 78.7 deg from...

If I take moments about C on the RHS only, I get: 3Rby - 3Rbx = 0 => Rby = Rbx If I sum the y's I get Rby = Rcy and Rcx = Rbx in the x-direction. The boundary conditions don't only for any moments... Is there a concentrated moment = 3Rby where the beam turns?

Grrr still can't solve this question. If I separate this into two FBDs the RHS of the structure tells me no matter what I try that all of the reactions in both directions are equal and opposite, and the same value. I'm doing something wrong, but I don't know what, but every time I try to...

Thanks, I've done a small amount of Laplace (about 5 years ago :P) but never applied it, nor was that class a prereq. The old exam was a 2008 edition so maybe I don't even need to know this for the unit. If you say it's needed then I'm guessing I don't have to know this stuff. Thanks...

I'm having quite a bit of difficulty with the question posted - even from part 1. I understand I have 6 unknowns and 2 seperable beams so we're statically determinate here. I can split the pictured beam into two parts at the hinge and apply the static equations twice. On the right part I...

Gah, I really have no idea what I'm doing. I've never seen this stuff before and it's two weeks worth of notes in one unit. What exactly have I been given in this question? Do I need any knowledge of Laplace to solve this? Is the input u(s) the controller function (involving tauI and tauD, in...

Hi Guys, Attached is a problem from an old exam for a Process Control and Instrumentation unit. I have tried everything I know (which isn't much, it's not the main assessable portion of the unit). Other questions similar involve giving us either the characteristic closed loop equation...