NDLI: Neural network system for helicopter rotor smoothing

Content Provider	IEEE Xplore Digital Library
Author	Wroblewski, D. Grabill, P. Berry, J. Branhof, R.
Copyright Year	2000
Description	Author affiliation: ORINCON Corp, San Diego, CA, USA (Wroblewski, D.)
Abstract	Helicopter rotor smoothing (track and balance) is a periodic maintenance task required to minimize rotor induced aircraft vibrations at the fundamental (once per revolution) rotor frequency. We have designed and implemented a general, neural network based software system for rotor smoothing. Neural networks provide non-parametric mappings between the spaces of adjustments and vibration measurements. In the network training process, these mappings are extracted from experimental data without any assumptions about their functional form. On the other hand, when the experimental data available for training is not complete, simulated data based on model dependencies (linear or other) may be also incorporated into the neural network model. The neural networks are easily updated (retrained) if new data becomes available thus allowing the system to evolve and mature in the course of its use. The customization of the system for helicopters of different types is facilitated by general-purpose software for application development, which includes preparation of flight data and neural network training. It is worth noting that the prototype applications developed up to date required relatively modest amount of flight data (20-30 flights). The neural network system has been applied to Apache (AH-64), Blackhawk (UH-60), and Kiowa Warrior (OH-58D) helicopters as part of the Vibration Management Enhancement Program (VMEP). Preliminary results are very encouraging. In the verification tests, we were able to shorten the smoothing time for AH-64, with all of the rotor smoothing procedures completed in 2 to 4 flights. In all cases, the neural network approach produced solutions with experimentally verified low vibration levels and small track split. The system has also demonstrated the ability to detect errors in implementation of the smoothing adjustments. Application to other types of helicopters is considered.
Starting Page	271
Ending Page	276
File Size	756484
Page Count	6
File Format	PDF
ISBN	0780358465
ISSN	1095323X
DOI	10.1109/AERO.2000.877903
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2000-03-25
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Neural networks Helicopters Smoothing methods Application software Aircraft Frequency Software systems Vibration measurement Data mining Management training
Content Type	Text
Resource Type	Article
Subject	Aerospace Engineering Space and Planetary Science

Sl.	Authority	Responsibilities	Communication Details
1	Ministry of Education (GoI), Department of Higher Education	Sanctioning Authority	https://www.education.gov.in/ict-initiatives
2	Indian Institute of Technology Kharagpur	Host Institute of the Project: The host institute of the project is responsible for providing infrastructure support and hosting the project	https://www.iitkgp.ac.in
3	National Digital Library of India Office, Indian Institute of Technology Kharagpur	The administrative and infrastructural headquarters of the project	Dr. B. Sutradhar bsutra@ndl.gov.in
4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
5	Website/Portal (Helpdesk)	Queries regarding NDLI and its services	support@ndl.gov.in
6	Contents and Copyright Issues	Queries related to content curation and copyright issues	content@ndl.gov.in
7	National Digital Library of India Club (NDLI Club)	Queries related to NDLI Club formation, support, user awareness program, seminar/symposium, collaboration, social media, promotion, and outreach	clubsupport@ndl.gov.in
8	Digital Preservation Centre (DPC)	Assistance with digitizing and archiving copyright-free printed books	dpc@ndl.gov.in
9	IDR Setup or Support	Queries related to establishment and support of Institutional Digital Repository (IDR) and IDR workshops	idr@ndl.gov.in

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