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Re: Restraining a suspended assy
In an assembly, you could simply model the tethers as distance mates.
If you are doing a motion analysis, I would skip the distance mates and model the tethers as very stiff springs.
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Re: Restraining a suspended assy
The analysis is a linear static study with a 40kN load. I need to check stress and deflection in the frame when hoisted fully-laden.
For this instance I have assumed an evenly disributed load.
I have simplisticly modelled the lifting point and tethers by drawing a 3D sketch representing the lifting straps extending from the centre of the pad eye holes at 30 degrees, and placing a coordinate system at the intersection.
I was thinking the coordinate system would be of some use in the study?-
Re: Restraining a suspended assy
There are different ways to get there. I would start by using SW Motion to determine the resultant forces. At the very least, it is a good reality check. From there, you could use the SW Motion results to apply to your FEA.
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You could model the actual tethers and include them in your FEA.
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You could model pins through the padeyes and constrain the pins to be a certain distance from a fixed point. Apply gravity and see what happens.
If I was working in NASTRAN, I would model the pins and constrain them with rigid elements to a fixed point.
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Re: Restraining a suspended assy
alternately, you could place unit loads on the pad eyes at the resultant angles and constrain the frame appropriately at the points where it supports the load.
for a statice linear analysis, all deflections and stresses etc can them be scaled to determine maixmum load.