Subject:
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Re: Crane Steering
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Newsgroups:
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lugnet.technic
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Date:
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Thu, 3 Mar 2005 11:45:45 GMT
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Viewed:
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2871 times
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In lugnet.technic, Ross Crawford wrote:
> The suspension is active, hydraulics lifting/lowering the wheels individually.
> As well as raising/lowering the carrier bed for loading/unloading, they are able
> to correct for uneven and sloped surfaces.
If you think about it a normal bog standard trailer has 4 wheels one at each
corner, like a table has legs. This is a very stable configuration.
If you built a six line modular trailer from lego (12 stub axles, 24 tyres, 12
cylinders) you would have to subdivde the pnumatics into 4 zones, one for each
corner. Otherwise as soon as you loaded it the weight of the load would cause
the trailer to roll (or pitch). Like a sinking ship as soon as it started going
one way the situation would only get worse.
The problem with this arrangement would be that if one of the subdivided zones
went onto higher terrain the trailer would tip over slightly, and the load
acting on the other zones would be uneven, slightly defeating the point of the
exercise. This must be why the real thing has a computer to self-level.
SRL
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Message has 1 Reply:
 | | Re: Crane Steering
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| You are forgetting one thing: The system for the suspension are a locked system, where the amount of oil are the same and dont increase or decrease if you change the the height on uneven ground: (URL) airsuspensions, the only thing that controls the (...) (20 years ago, 3-Mar-05, to lugnet.technic)
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Message is in Reply To:
| | Re: Crane Steering
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| (...) Their steering is hydraulic and computer controlled (as is their suspension), each axle can be turned individually. This allows them to be tethered together in many configuration, end-to-end or side-by-side, or combinations, and all controlled (...) (20 years ago, 2-Mar-05, to lugnet.technic)
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