Ok. So, i have been giving the assignment of designing and testing an engine room crane for use on ship. I have designed a crane which has 2 i-beams which a trolley travels along. My questions are:-
-How do i find the second moment of area of the I-beams? The equation i am using is giving me negative answers EVERYtime.
-How do i convert the weight of the crane trolley (tonnes) into a force (Newtons).
-How do i calculate the max. deflection with a modulus of elasticity of 210G/nm squared.
I think i have the right equations for the last 2 but the answer i get for the first question is messing everything else up.
The equations i am using are:-
Ix = (bh)cubed - 2((b-tw)/2) x (h1)cubed / 12
WL = (W/No. of Beams) x (Lx - x squared)
Max Deflection = 1.25 WL ^4 / 38 x 4EI