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Center of Buoyancy

Question asked by Seth Renigar on Oct 30, 2009
Latest reply on May 19, 2010 by Roy Richard

Time to put on your thinking caps for this one.



I am trying to help out a co-worker here that is trying to find the center of buoyancy of his assembly. The assembly is made up up many parts. Some parts are lighter than water. Others are heavier. Overall, the combination of all these parts and their densities makes the assembly virtually neutral when completely submerged under water like it is intended to be used.



The question is, how do we find the center of buoyancy of the assembly? We need to move parts around in order to get the center of buoyancy to be as close to the center of gravity as possible, so that the assembly does NOT have a tendency to roll over to any particular orientation.



Think of a ball for example. A balls center of buoyancy is the same as its center of gravity. Therefore it does not "try" to roll over in water. That's what we are trying to do with this assembly. But since it is made up of multiple density parts, and more importantly some parts that are lighter than water, we can't figure out how to do this.



I read a couple other threads where it talks about making a cavity in one, and make one part out of the assembly, yadda, yadda. But I'm pretty sure these techniques would only work for assemblies that A) are not completely submerged B) made up from parts that all have the same densities.



Does anyone have an idea on how we can do this? Does Simulation offer a tool to help calculate this? Remember, we're not looking to calculate the buoyant force. But rather the center of buoyancy.