Hi there. I've got issues. Big ones.(adsbygoogle = window.adsbygoogle || []).push({});

I need to simplify this crane structure, and calculate the strength on cilinder |c1c2| when applying a vertical load on the crane's hook. The purpose of this is to find how much of the strength is absorbed by the first cylinder (and possible the second one |c3c4| as well). I need to devise aheave compensator. If the crane tip has a certain downward acceleration due to ship movement, I need to know how much |c1c2| has to extend in order to compensate the movement and keep the crane tip the same vertical position.

- Points A, B, c1 are fixed.

- The first hydraulic cylinder can rotate around c1

- joint c3 of the first hydraulic cylinder can rotate around B

- c4 rotates around c3

- Distances |DE| and |EF| are variable and controlled by two hydraulic cylinders mounted on top of the crane's boom.

How do I get at this? I've learned how to calculate trusses and beams, but this structure is highly dynamic, complex, and a little beyond my reach at the moment. Is there an easy way to do this? Or a difficult way? By using certain software programs for example... ?

All help is appreciated, even if it is just sending me to the library or whatever. I've been looking through crane books, and books about static & dynamic strength calculations, but I've gotten none the wiser on how to tackle this one...

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# CRANE: How to calculate the strengths on hydraulic cylinders? (static + dynamic)

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