Cherry Pickr Tippng Angle & Potential Energy Req To Tip

AI Thread Summary
The discussion focuses on calculating the load charts for cherry pickers on semi-submersible rigs, specifically how to de-rate them in various sea states. The main challenge is determining the potential energy required to tip a cherry picker during rig roll and pitch, as well as the angle of inclination needed for tipping. One participant clarifies that tipping does not require energy input; rather, it occurs when the center of mass moves outside the base. The conversation emphasizes the importance of understanding the mechanics of tipping in relation to the center of gravity. Overall, the thread seeks practical insights into simplifying these engineering calculations.
glocki35
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Hi,

I have been tasked with working out load charts for various MEWPS (or cherry pickers) on board semi-submersible rigs, the iddea is to de-rate these in various sea states the same as an offshore crane, i have tried to simplify this as much as i can, however i am stuck when i try to work out the potential energy required to tip a cherry picker when the rig rolls and pitches (this is not a comprehensive engineering investigation, merely a simplification of what is required), i also would like to work out the inclination or angle required to make the cherry picker tip over.

Can anyone help with this?, i have attached a doc with sketches and figures to try and show you my way of thinking...

Thanks in advance

Glocki 35
 

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Engineering news on Phys.org
It doesn't take any energy to tip - it gives off energy that's why it happens.
You just need the CoG (technicaly the centre of mass) to move outside the base (ie the wheels) all pitching and rolling of a ship does is to provide the tip
 
Hi MGB_phys,

just wanted to say thanks for the reply, much appreciated :)
 

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