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Stability Control/prevent Tilting  
User currently offlineSH@VIE From Austria, joined Mar 2001, 38 posts, RR: 0
Posted (10 years 7 months 1 week 4 days 21 hours ago) and read 1933 times:


I'm a student at the Vienna university of business administration and at the moment I'm working on a project with the company Palfinger (a manufacturer of truck mounted knuckle-boom crane in Austria) on the topic of stability control.

We are trying to solve the stability problems of mobile cranes / cranes built on trucks. In practice a lot of times the crane / truck cannot be fully stabilized while working with the crane. This situation is often caused because of missing space at the construction site / workplace or because of timing reasons.

In this situation a system is needed, which helps the crane driver to recognize the point, where the crane is going to tilt. It should tell the driver beforehand that the crane is going to tilt and that he can take reverse measures!

- I wonder whether this topic poses a problem in the aviation business too?!
(regarding for example this 2 photos: http://www.airliners.net/open.file/520237/L/ http://www.airliners.net/open.file/520236/L)
- And if yes, which existing systems prevent tilting?
- Are there any other fields in the civil aviation where the described problem is also immanent? (if yes - which fields)

Thanks for any hints & tips!


3 replies: All unread, jump to last
User currently offlineBri2k1 From United States of America, joined Dec 2004, 988 posts, RR: 3
Reply 1, posted (10 years 7 months 1 week 4 days 17 hours ago) and read 1899 times:

From those photos, it's fairly obvious that there are no automatic anti-tilting systems on aircraft. For this reason, before every flight, it is prudent (and required, under certain operations) to complete a weight and balance sheet. Every single time I've flown an RJ that wasn't full, passengers were asked to "volunteer" to move to different parts of the plane to make the weight and balance work.

It would probably be possible to install a system of levels on the crane, compute the maximum load lifted by the boom, compute the moment arm about the center of the crane, and raise alarms when the maximum tilt is reached. However, in most cranes, the critical angle will be reached so suddenly, it will be impossible to do anything quickly enough to prevent tipping. Always using all available supports, ensuring the crane is level before lifting, and never exceeding load limits is the best policy.

Position and hold
User currently offlineFredT From United Kingdom, joined Feb 2002, 2185 posts, RR: 26
Reply 2, posted (10 years 7 months 1 week 4 days 16 hours ago) and read 1890 times:

As for the cranes, install load sensors in all supports (suspension and support arm feet). Alert the operator when the load on one support goes below a given threshold. Unless you allow a support to become unloaded, the crane will not tip.

I thought I was doing good trying to avoid those airport hotels... and look at me now.
User currently offlineNZ1 From New Zealand, joined May 2004, 2319 posts, RR: 23
Reply 3, posted (10 years 7 months 1 week 3 days 9 hours ago) and read 1823 times:

Quoting FredT (Reply 2):
As for the cranes, install load sensors in all supports (suspension and support arm feet). Alert the operator when the load on one support goes below a given threshold. Unless you allow a support to become unloaded, the crane will not tip.

You beat me too it. Thats exactly what I would do.


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