Recent content by KIPP

  1. K

    Active Heave Compensation

    Dear Waled, My studies lie in the field of electromechanical engineering, with a brief spin-off into the maritime industry with this thesis. My spare time activities focus more on the music recording industry (audio engineering/production). A frequency-nerd as well, if you will. Could I...
  2. K

    Active Heave Compensation

    Hi Waled Gaber, The crane is used on a ship that assists cutter and suction hopper dredgers, so the boat and cranes go anywhere the ships go. This is indeed usually in coastal and harbour regions, but the occasional tanker that passes by, can lead to bigger waves, and bigger dynamic loads on...
  3. K

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

    I am always more than willing to listen, if you have more information about the acceleration analysis. I know the time frame of this thesis, and the fact that I have very little background means my research can't be very in depth, but I figure the more I can learn from this the better.
  4. K

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

    I'm afraid I lack the experience, both practical as in design of hydraulics, to be able to work this out properly, covering all the bases. Needless to say I'm in desperate need of people that know their hydraulics and can teach me a thing or two, things that can't be taught through textbooks, or...
  5. K

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

    Thank you for your replies everyone. I had a meeting with a company that makes dynamic heave compensation platforms for ships today, and inverse kinematics is indeed the way to go. This translates into a forces, if the weight of the booms and craneload are known (which they aren't, but I can...
  6. K

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

    Hi Pkruse, I know about free body diagrams and linkages, but I've never had to calculate one this complex, so I'm having some trouble working it out. Best solution indeed we be to do testing on the crane, or have the company that made the crane send me their test data. The crane...
  7. K

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

    Hi there. I've got issues. Big ones. 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...
  8. K

    Active Heave Compensation

    Thanks Crobb, I'll have a look into those DNV codes. I have considered strain gauges in the hook of the crane, and an MRU to measure the ship's angular and vertical movements. These signals can be sent to a motion controller and used to control the movement of the hydraulic cylinders of the...
  9. K

    Active Heave Compensation

    The mobile crane is from an italian manufacturer named Heila. I contacted them a couple times, but they didn't reply. I contacted their distrubutor in the Netherlands but they only had a very basic Acad plan, no actual production plans. I've also tried contacting Liebherr and Huismann, other...
  10. K

    Active Heave Compensation

    For my master's thesis I've been given the assignment to design an active heave compensation system for a mobile shipboard crane. The problem is that I have very little information about the crane itself. There's little or no information about the hydraulic cylinders for example, materials...
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