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Tool for Blade Stress Estimation during Multiple Simultaneous Vibratory Mode Responses

Award Information
Agency: Department of Defense
Branch: Air Force
Contract: FA9550-14-C-0040
Agency Tracking Number: F11B-T22-0116
Amount: $749,855.00
Phase: Phase II
Program: STTR
Solicitation Topic Code: AF11-BT22
Solicitation Number: 2011.0
Solicitation Year: 2011
Award Year: 2014
Award Start Date (Proposal Award Date): 2014-04-01
Award End Date (Contract End Date): 2016-03-31
Small Business Information
2780 Skypark Drive Suite 400
Torrance, CA 90505
United States
DUNS: 000000000
HUBZone Owned: No
Woman Owned: No
Socially and Economically Disadvantaged: Yes
Principal Investigator
 Principal Investigator
 (310) 626-8653
Business Contact
 Zoltan Feher
Title: Manager, Contracts and Pricing
Phone: (310) 626-8384
Research Institution
 San Diego State University
 Sandra Nordahl
5250 Campanile Drive SDSU Research Foundation
San Diego, CA 92182-1931
United States

 (619) 594-4172
 Nonprofit College or University

ABSTRACT: NextGen Aeronautics, leveraging past experience in generating stress spectra from static and vibratory loads as well as knowledge of gas turbines, is proposing a method for estimating blade stresses from multiple vibratory loads in rotating systems from limited manufacturer data from Campbell diagrams and strain gage blade stresses. The method hinges on utilizing 3D parametric generic integrally bladed rotor and single blade models, extracting lower order equivalent models and tuning the lower order models to reproduce the manufacturer modal data and forced response multi-modal stresses on discrete or all locations on a blade. Additionally, uncertainty bounds on the stresses will be provided to life estimation predictions. An easy-to-use software application will be developed for the entire generic model development and stress extraction and integrated into a commercial-of-the-shelf CAE pre and post processor. Our team consists of experts in dynamics and vibration and has strong support from P&W for the technology transition phase. BENEFIT: The technology finally developed in this program will directly benefit safe operation of gas turbines in the aviation industry as well as industrial steam and wind turbines, through better estimation of stresses generated from multiple vibratory loads. Costly re-designs from pre-mature failures in ground and flight test programs will be avoided and will aid in intelligent inspection intervals for safe operation of rotating systems.

* Information listed above is at the time of submission. *

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