Pneumatic Cylinder to open Hatch

AI Thread Summary
The discussion focuses on designing a pneumatic system to open a 500lb hatch using a pneumatic cylinder and bell crank mechanism. The user seeks assistance in calculating the necessary force to size the cylinder appropriately, aiming for the hatch to open 110 degrees in 10 seconds. A suggested approach includes calculating acceleration using the equation of motion and determining torque based on the inertia of the hatch. From the torque, the required force can be derived using the formula F=Tr, where r is the radial distance of rotation. Diagrams and a clear layout of the hatch's constraints are recommended for better understanding.
jrobinson
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Hey everyone,

Having a little trouble with something a little out of my element. I've been tasked to design a pneumatic system to open a ~500lb hatch. I think I'm leaning towards a pneumatic cylinder to act on a bell crank. I need the hatch to open to 110 degrees from zero in about 10 seconds.

Where I'm getting stuck is on the force necessary to perform this action so I can size my cylinder and then the rest of the system. Any help would be greatly appreciated.
 
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What is the layout like? You need to describe how the hatch is constrained and what it looks like. Diagrams are really helpful in these cases.
 
jrobinson said:
Hey everyone,

Having a little trouble with something a little out of my element. I've been tasked to design a pneumatic system to open a ~500lb hatch. I think I'm leaning towards a pneumatic cylinder to act on a bell crank. I need the hatch to open to 110 degrees from zero in about 10 seconds.

Where I'm getting stuck is on the force necessary to perform this action so I can size my cylinder and then the rest of the system. Any help would be greatly appreciated.

1st of all calculate the acceleration

acceleration can calculated by using equation of motion,

aceeleration= 2ө/ (tXt)
where ө= total angle travelled, (in your case it is 110 degrees)
t= time taken for traveling the angle ө(in your case it is 10 sec.)

torque, T= (inertia of the rotating object) X acceleration


From th torque u can calculate the force required...

Force F=Tr, where r is the radial distance @ which u r rotating the object...
 
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