- #1

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## Homework Statement

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.

## Homework Equations

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