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Search: Posts Made By: WojtekSz
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Forum: Tech Log
14th Feb 2011, 19:15
Replies: 746
Views: 209,671
Posted By WojtekSz

Derg: exposing such information to public poses...

Derg:
exposing such information to public poses a threat to national security :ugh:
Now you can understand why some countries do close internet access at all - remember what some BIG money makers...
Forum: Tech Log
14th Feb 2011, 19:06
Replies: 746
Views: 209,671
Posted By WojtekSz

what do you want to say, really?

U415967:
looks like you may have not spent too much time reading all this forum before starting to write ;)
And possibly that is why RR is currently at 3rd iteration (C) of the solution for...
Forum: Tech Log
10th Feb 2011, 00:48
Replies: 746
Views: 209,671
Posted By WojtekSz

Turbine D, Derg: hey, you are both right !-...

Turbine D, Derg:
hey, you are both right !- there are basic problems somewhere within RR design and business but being an European i am a little biased towards trying to understand RR problems while...
Forum: Tech Log
9th Feb 2011, 21:30
Replies: 746
Views: 209,671
Posted By WojtekSz

yeah, you're right but would you build anything...

yeah, you're right but would you build anything valuable (say: a 0,1M$ house or a 10M$ bridge or a 10M$ turbine engine) based on such facts as we have here ;)
I would say these are good for...
Forum: Tech Log
9th Feb 2011, 18:25
Replies: 746
Views: 209,671
Posted By WojtekSz

Derg: have you invented a new Deduction...

Derg:
have you invented a new Deduction Generator ;) ?
Looks like too much of a guesswork at play, why don't we stick to facts pls
Fan - carbon fibre is lighter but more expensive. Companies do...
Forum: Tech Log
8th Feb 2011, 19:45
Replies: 746
Views: 209,671
Posted By WojtekSz

Turbine D: thanks - your clear explanation +...

Turbine D:
thanks - your clear explanation + some web search produced much better understanding that the combustor tech can be very simple (available to enthusiasts) or complicated (professional big...
Forum: Tech Log
8th Feb 2011, 06:37
Replies: 746
Views: 209,671
Posted By WojtekSz

Turbine D, Barit1 thanks for good examples - it...

Turbine D, Barit1
thanks for good examples - it really is a case by case operation then ;) like fine tunung relative natural frequencies so they would not happen together. Does this tuning also...
Forum: Tech Log
7th Feb 2011, 22:49
Replies: 746
Views: 209,671
Posted By WojtekSz

Turbine D: thanks - it is a pure pleasure to...

Turbine D:
thanks - it is a pure pleasure to read such posts :)

could you pls tell a little more on techniques to absorb vibrations? The lower the weight and stiffer the shape the higher is the...
Forum: Tech Log
7th Feb 2011, 09:03
Replies: 746
Views: 209,671
Posted By WojtekSz

Derg: look also at the second article...

Derg:

look also at the second article mentioned: http://www.eng.ox.ac.uk/samp/pubs/clifton_transfer.pdf and check fig 2.2 referring to trent 900 engine with data "...constructed from 200 hours of...
Forum: Tech Log
7th Feb 2011, 05:22
Replies: 746
Views: 209,671
Posted By WojtekSz

Derg i believe the problem is actually not the...

Derg
i believe the problem is actually not the bearings but the structure supporting the bearings - forces, temperatures and vibrations do significantly impair bearings geometry and hence the...
Forum: Tech Log
6th Feb 2011, 20:21
Replies: 746
Views: 209,671
Posted By WojtekSz

yeah, i know there is some difference between...

yeah, i know there is some difference between micro and nano - i was boring holes to micrometer tolerances ;)
still we are discussing the accuracy of balls and the track: overall bearing...
Forum: Tech Log
6th Feb 2011, 12:43
Replies: 746
Views: 209,671
Posted By WojtekSz

thanks ;) this one should do better : ...

thanks ;) this one should do better :
http://mdrl.mne.psu.edu/papers/bearinganalyzer.pdf
Forum: Tech Log
6th Feb 2011, 10:54
Replies: 746
Views: 209,671
Posted By WojtekSz

Derg bearings: i am learning from this...

Derg

bearings: i am learning from this thread rather than trying to teach anyone ;) even if having some experience from high precision machine tools spindles which needed the speeds and accuracies...
Forum: Tech Log
5th Feb 2011, 12:26
Replies: 746
Views: 209,671
Posted By WojtekSz

bear, Derg: the grease is not a solution - keep...

bear, Derg:
the grease is not a solution - keep in mind that the bearings need cooling which comes from the flow of cooling medium - in this case oil or oil mist (depending on load/speed). So the...
Forum: Tech Log
23rd Jan 2011, 22:47
Replies: 746
Views: 209,671
Posted By WojtekSz

Bearfoil: do i get you right: technically they...

Bearfoil:
do i get you right: technically they could have made a mistake but instead of making it clear they kept on selling the stuff hoping to get away with it?
Do you believe RR have already...
Forum: Tech Log
23rd Jan 2011, 22:35
Replies: 746
Views: 209,671
Posted By WojtekSz

Derg: using the finite element method...

Derg:
using the finite element method scientist/engineers can predict mechanical beahviour of any part in known conditions. Actually they can model it according to known and proven cases. Problem...
Forum: Tech Log
23rd Jan 2011, 22:07
Replies: 746
Views: 209,671
Posted By WojtekSz

Bearfoil: i can agree to certain level of...

Bearfoil:
i can agree to certain level of vibrations from the burning process but i do belive that it must be very much similar to the very process eqisting in all other aero engines flying all...
Forum: Tech Log
23rd Jan 2011, 09:03
Replies: 746
Views: 209,671
Posted By WojtekSz

TurbineD: torsional load on the shaft and on...

TurbineD:
torsional load on the shaft and on the spline coupling comes form hot gases from burning process. Bearfoil calls it fluid drive but the fluid is still very compressable compared to any...
Forum: Tech Log
20th Jan 2011, 22:03
Replies: 746
Views: 209,671
Posted By WojtekSz

Spline Damage Due To Torque Stress

Derg:

actually both two-spool and three-spool engines have shafts inside shafts
when discussing different load components acting in any joint it is important to evaluate actual values of these...
Forum: Tech Log
15th Jan 2011, 10:59
Replies: 746
Views: 209,671
Posted By WojtekSz

there is also another difference concerning...

there is also another difference concerning spline location
in GP the spline is located directly 'inside' bearing and in T900 the IP spline is 'outside' of the bearing plane. The difference becomes...
Forum: Tech Log
9th Jan 2011, 15:58
Replies: 746
Views: 209,671
Posted By WojtekSz

bearfoil the strange thing with vibrations...

bearfoil

the strange thing with vibrations is that sometimes you can get better results by getting the item actually lighter (remember the famous story of Mr Citroen?). The trick is to get away...
Forum: Tech Log
9th Jan 2011, 14:34
Replies: 746
Views: 209,671
Posted By WojtekSz

Derg: thanks ;) i have posted the link to...

Derg:

thanks ;)
i have posted the link to both books to propose an explanation on how the shaft's splines have gone away as this is the problem RR has to solve. And this may in fact also include...
Forum: Tech Log
9th Jan 2011, 10:28
Replies: 746
Views: 209,671
Posted By WojtekSz

Handbook of case histories in failure analysis ...

Handbook of case histories in failure analysis


Handbook of case histories in ... - Google Ksi??ki (http://books.google.pl/books?id=SG81FlgeSSgC) @ transportation components pp.17
provides...
Forum: Tech Log
9th Jan 2011, 07:55
Replies: 746
Views: 209,671
Posted By WojtekSz

wobble at separation

TurbineD, bearfoil
there is no damage at the end bearings (roller) but the damage may be seen closer to front bearings, where the IP shaft splines are located

what bothers me is the way the drive...
Forum: Tech Log
8th Jan 2011, 13:40
Replies: 746
Views: 209,671
Posted By WojtekSz

Derg: if it only would have been so simple - we...

Derg:
if it only would have been so simple - we have had in Poland a case last April when in the plane crash some 96 people died including a President and practically all top brass people (for the...
Forum: Tech Log
6th Jan 2011, 22:42
Replies: 746
Views: 209,671
Posted By WojtekSz

derg: unfortunately i am fully in support...

derg:

unfortunately i am fully in support for these statements.
So have we reached the point where the globalisation and production concentration has practically killed competition and...
Showing results 1 to 26 of 26


 
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