HOME  |  NEWS  |  BLOGS  |  MESSAGES  |  FEATURES  |  VIDEOS  |  WEBINARS  |  INDUSTRIES  |  FOCUS ON FUNDAMENTALS
  |  REGISTER  |  LOGIN  |  HELP
Martin
User Rank
Bronze
Re: GTF bearings article
Martin   8/4/2011 2:19:59 PM
NO RATINGS
Very Nice.

 

note:

\The gearbox picture is missing a "/".

 

http://www.purepowerengine.com/images/photo_galleries/new_gallery/purepower_gear_sys/lg1.jpg

 

fixed.............Martin

Kapadget33
User Rank
Iron
Re: GTF bearings article
Kapadget33   8/4/2011 8:37:47 AM
NO RATINGS
Martin, You can find more photos - and high res photos - on the PurePower website:  http://www.purepowerengine.com/photos.html

apresher
User Rank
Blogger
Wear Resistant Bearings Information
apresher   8/3/2011 5:06:54 PM
NO RATINGS
Here is link to article and additional information on Wear Resistant Bearings from Gary Doll, Chief Technologist at Timken published in September 2010.

http://www.designnews.com/document.asp?doc_id=229336

Martin
User Rank
Bronze
GTF bearings article
Martin   8/3/2011 4:52:06 PM
NO RATINGS
Am disappointed the engine images are so small and not detailed. P&WC or Big Pratt itself have very little actual product drawings on their web sites....Martin

Douglas Smock
User Rank
Platinum
Fluroropolymers
Douglas Smock   8/3/2011 4:31:38 PM
NO RATINGS
Good stuff. Are there any details available on the wear-resistant coatings from Timken? I'm curious if they're using a fluropolymer base or if they are achieving superior tribological properites through some other technology.

apresher
User Rank
Blogger
Re: No Tapered Roller bearings?
apresher   8/3/2011 1:56:40 PM
NO RATINGS
There isn't a typo but the quote: “One reason the PurePower engine is a first is because there are no tapered roller bearings in main shaft positions,” might be slightly more clear if it had read “there are currently no tapered roller bearings in main shaft positions”.   You're right this is a major innovation becausethe PurePower engine is the first to use this type of bearing for a jet engine design. Thanks.

Kapadget33
User Rank
Iron
Re: No Tapered Roller bearings?
Kapadget33   8/3/2011 1:28:45 PM
NO RATINGS
Ivan, the Pratt & Whitney PurePower® geared turbo fan (or GTF) uses a speed reduction gearbox between the engine’s low-pressure turbine and fan. The GTF allows the engine’s low-pressure turbine to operate at higher rotational speeds for peak efficiency, while the engine’s fan operates at lower speeds compatible with optimum propulsive efficiency and significantly lower levels of noise. In combination, the GTF provides enhanced fuel efficiency and reduced levels of noise in an engine that is also lighter, and lower in maintenance cost, than conventional turbo fan engines.

Ivan Kirkpatrick
User Rank
Platinum
No Tapered Roller bearings?
Ivan Kirkpatrick   8/3/2011 12:45:52 PM
NO RATINGS
I suspect a misquote!  The article's quote says there are no tapered roller bearings but then goes on to tout their advantages over a combination of ball and cylindrical bearings. Subsequent details show this to be a major improvement.

The geared fan feature is interesting but it is not clear exactly how this contributes to the efficiency improvements.  Does the geared section step up the main fan rotation speeds or step them down?  I would guess down so the power turbine section can rotate faster and drive a slower but larger main fan section for the bypass air.

In my power systems class in college my classmate and I wrote a computer program to analyze the Thrust Specific Fuel Consumption (tsfc) on a low bypass turbofan engine.  I wish I had the code for that now.  It would be interesting to note some of the technical characteristics of the engine compared to previous designs.  The improvements sound dramatic and I would like to know more details about how they were achieved.  A specially optimised combustor and tapered roller bearings are interesting but only whet my appetite for the details.  



Partner Zone
Latest Analysis
Hacking has a long history in the movies, beginning with Tron and War Games and continuing through The Girl with the Dragon Tattoo.
In a move that strengthens its 3D design business, Stratasys continued a 15-month buying spree this week by announcing its plan to acquire GrabCAD, a provider of a cloud-based collaboration environment for engineers.
Feature-advantage-benefit could help engineers in how we approach design problems, how we sell our ideas to management, and how we market ourselves when it comes to jobs.
Many diverse markets take advantage of semiconductor IP; so many that no one can recite the entire list without leaving off several. So why do we track all the vertical markets? They all have a unique set of requirements and value attributes differently. One major vertical market segment is automotive.
Adam Berger hacked a computer keyboard into a mini key-tar to play with his band.
More:Blogs|News
Design News Webinar Series
9/10/2014 11:00 a.m. California / 2:00 p.m. New York
7/23/2014 11:00 a.m. California / 2:00 p.m. New York
7/17/2014 11:00 a.m. California / 2:00 p.m. New York
6/25/2014 11:00 a.m. California / 2:00 p.m. New York
Quick Poll
The Continuing Education Center offers engineers an entirely new way to get the education they need to formulate next-generation solutions.
Sep 22 - 26, MCU Software Development A Step-by-Step Guide (Using a Real Eval Board)
SEMESTERS: 1  |  2  |  3  |  4  |  5  |  6


Focus on Fundamentals consists of 45-minute on-line classes that cover a host of technologies. You learn without leaving the comfort of your desk. All classes are taught by subject-matter experts and all are archived. So if you can't attend live, attend at your convenience.
Next Class: September 30 - October 2
Sponsored by Altera
Learn More   |   Login   |   Archived Classes
Twitter Feed
Design News Twitter Feed
Like Us on Facebook

Sponsored Content

Technology Marketplace

Copyright © 2014 UBM Canon, A UBM company, All rights reserved. Privacy Policy | Terms of Service