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How Does Gyroscopic Rigidity Affect A Turbofan?  
User currently offlineKaddyuk From Wallis and Futuna, joined Nov 2001, 4126 posts, RR: 26
Posted (9 years 10 months 5 days 5 hours ago) and read 5441 times:

Just a question that I asked myself that I couldnt answer...

Does gyroscopic rigidity affect an engine and its frame? If so, How? and When and what can it effect?


Whoever said "laughter is the best medicine" never had Gonorrhea
6 replies: All unread, jump to last
 
User currently offlinePhilsquares From , joined Dec 1969, posts, RR:
Reply 1, posted (9 years 10 months 5 days 4 hours ago) and read 5242 times:

The biggest area affected is the fan section. On the PW 2000/4000, the outer fan ring and fan blade tips have been the subject of several ADs. When the 4000 first entered service on the -400, there was substantially much more fan tip erosion than expected, some of this was attributable to FOD, but there was an issue with gyroscopic effects on the N1 section.

User currently offlineSATL382G From , joined Dec 1969, posts, RR:
Reply 2, posted (9 years 10 months 5 days 3 hours ago) and read 5225 times:

OK, what is gyroscopic rigidity?

Is this related to the ovalization problems the first 747s had?


User currently offlineKaddyuk From Wallis and Futuna, joined Nov 2001, 4126 posts, RR: 26
Reply 3, posted (9 years 10 months 5 days 3 hours ago) and read 5221 times:

http://www.howstuffworks.com/gyroscope.htm

I know what it is, but its god damned hard to explain it... I hope that by reading that article you might find an answer :S



Whoever said "laughter is the best medicine" never had Gonorrhea
User currently offline411A From United States of America, joined Nov 2001, 1826 posts, RR: 8
Reply 4, posted (9 years 10 months 4 days 22 hours ago) and read 5186 times:

This slight problem has manifested itself on several aircraft, but only to a rather minor degree.

Nacelle 'pod-nod' on the Lockheed TriStar, for example.
Altho initially caused by VIGV oscillations, the entire nacelle gets to a movin' and sure can look rather odd to the unwary passenger.


User currently offlineAvt007 From Canada, joined Jul 2000, 2132 posts, RR: 5
Reply 5, posted (9 years 10 months 4 days 11 hours ago) and read 5127 times:

Gyroscopic forces are blamed for ripping the engines off the Airbus that lost its' vertical stabilizer.

User currently offlineMD11Engineer From Germany, joined Oct 2003, 14030 posts, RR: 62
Reply 6, posted (9 years 10 months 4 days 10 hours ago) and read 5126 times:

On many modern jet engines, esp. the PW4000 series, the reverser cowl supports the engine housing and gives it additional rigidity especially on rotation to prevent it from bending under the gyroscopic forces of the shaft. This feature is called a load sharing cowl and incorporates additional latches. You can´t run the engine with the c-duct open.
If the load sharing latches are not properly adjusted or closed in the correct sequence, on rotation the fan or the rear turbine stages can touch the fan case, respectively the turbine housing. You can see it by irregular wear on the rub strip in the fan case.

Jan


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