AngeloB
Guest
for me this is a recurring argument.
I wanted an opinion on these considerations
I have to evaluate the efforts transmitted to the bridge by a tree bears signals.
in particular I must find the order of magnitude of the moment flempting transmitted to the structures of the ship, in case of sea very moved.
1. the ship is small, 56-60 meters long. Therefore I imagine that roll and beaking are very accentuated.
2. in tree head I have a p1 weight, about 150 kg
3. the height of the tree from the bridge is l1, about 10 mt
4. the tree has its own weight pa, which I consider concentrated to l1/2
5. the tree in reality will be torn, but in favor of safety, I do not consider this condition.
6. I consider the tree as a framed beam, length l
7. I consider the ship disbanded of 20°
8. p1 and pa in the respective perpendicular components; p1p and pap, and parallel to the vertical axis of the tree.
9. I find the moment generated by the perpendicular components, mf=p1p*l1+pap*(l1/2)
10. I consider, arbitrarily, that the roll and beaking motions can at most cause an acceleration of 3g.
11. as mentioned above multiplic multiplic mf of a factor 3, and I find indicatively the maximum flender moment transmitted to the bridge.
the other load conditions could be:
a. evaluation of wind effect
b. any resonance effects
I wanted an opinion on these considerations
I have to evaluate the efforts transmitted to the bridge by a tree bears signals.
in particular I must find the order of magnitude of the moment flempting transmitted to the structures of the ship, in case of sea very moved.
1. the ship is small, 56-60 meters long. Therefore I imagine that roll and beaking are very accentuated.
2. in tree head I have a p1 weight, about 150 kg
3. the height of the tree from the bridge is l1, about 10 mt
4. the tree has its own weight pa, which I consider concentrated to l1/2
5. the tree in reality will be torn, but in favor of safety, I do not consider this condition.
6. I consider the tree as a framed beam, length l
7. I consider the ship disbanded of 20°
8. p1 and pa in the respective perpendicular components; p1p and pap, and parallel to the vertical axis of the tree.
9. I find the moment generated by the perpendicular components, mf=p1p*l1+pap*(l1/2)
10. I consider, arbitrarily, that the roll and beaking motions can at most cause an acceleration of 3g.
11. as mentioned above multiplic multiplic mf of a factor 3, and I find indicatively the maximum flender moment transmitted to the bridge.
the other load conditions could be:
a. evaluation of wind effect
b. any resonance effects