skip to main content
OSTI.GOV title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: Advanced signal processing of turbine rotor bore waveforms. Final report

Abstract

EPRI Research Project 502-8 was established to investigate advanced signal processing methods as applied to the ultrasonic inspection of turbine rotor bores. The rf waveform responses from near bore defects contain much information which can be used to characterize these flaws. This information is not used in conventional UT systems. The purpose of this effort has been to (1) determine which signal processing operations could be used to enhance the quality and interpretation of rotor bore inspection data, and (2) to investigate advanced methods of characterizing the defects using the rf waveforms to provide the inspector with additional knowledge as to defect type. An outcome of this effort was to develop an Adaptive Learning Network (ALN) model tested using data recorded on the (retired) Kanawha and Connors Creek rotors. Subsequent destructive results showed that the ALN was able to discriminate accurately between inclusions and crack-like flaws in the Kanawha rotor.

Authors:
; ; ;
Publication Date:
Research Org.:
Adaptronics, Inc., McLean, VA (USA)
OSTI Identifier:
5333837
Report Number(s):
EPRI-NP-2203
ON: DE82902202; TRN: 82-013331
Resource Type:
Technical Report
Country of Publication:
United States
Language:
English
Subject:
22 GENERAL STUDIES OF NUCLEAR REACTORS; 20 FOSSIL-FUELED POWER PLANTS; FOSSIL-FUEL POWER PLANTS; STEAM TURBINES; NUCLEAR POWER PLANTS; ULTRASONIC TESTING; DATA PROCESSING; PERFORMANCE; ACOUSTIC TESTING; MACHINERY; MATERIALS TESTING; NONDESTRUCTIVE TESTING; NUCLEAR FACILITIES; POWER PLANTS; PROCESSING; TESTING; THERMAL POWER PLANTS; TURBINES; TURBOMACHINERY; 220200* - Nuclear Reactor Technology- Components & Accessories; 200104 - Fossil-Fueled Power Plants- Components

Citation Formats

Whalen, M.F., Zuralow, M., Barber, J.H., and Mucciardi, A.N. Advanced signal processing of turbine rotor bore waveforms. Final report. United States: N. p., 1982. Web.
Whalen, M.F., Zuralow, M., Barber, J.H., & Mucciardi, A.N. Advanced signal processing of turbine rotor bore waveforms. Final report. United States.
Whalen, M.F., Zuralow, M., Barber, J.H., and Mucciardi, A.N. Fri . "Advanced signal processing of turbine rotor bore waveforms. Final report". United States. doi:.
@article{osti_5333837,
title = {Advanced signal processing of turbine rotor bore waveforms. Final report},
author = {Whalen, M.F. and Zuralow, M. and Barber, J.H. and Mucciardi, A.N.},
abstractNote = {EPRI Research Project 502-8 was established to investigate advanced signal processing methods as applied to the ultrasonic inspection of turbine rotor bores. The rf waveform responses from near bore defects contain much information which can be used to characterize these flaws. This information is not used in conventional UT systems. The purpose of this effort has been to (1) determine which signal processing operations could be used to enhance the quality and interpretation of rotor bore inspection data, and (2) to investigate advanced methods of characterizing the defects using the rf waveforms to provide the inspector with additional knowledge as to defect type. An outcome of this effort was to develop an Adaptive Learning Network (ALN) model tested using data recorded on the (retired) Kanawha and Connors Creek rotors. Subsequent destructive results showed that the ALN was able to discriminate accurately between inclusions and crack-like flaws in the Kanawha rotor.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Fri Jan 01 00:00:00 EST 1982},
month = {Fri Jan 01 00:00:00 EST 1982}
}

Technical Report:
Other availability
Please see Document Availability for additional information on obtaining the full-text document. Library patrons may search WorldCat to identify libraries that may hold this item. Keep in mind that many technical reports are not cataloged in WorldCat.

Save / Share:
  • A performance evaluation of a rotor boresonic examination system built by Southwest Research Institute for Taiwan Power was conducted by the Electric Power Research Institute Nondestructive Evaluation Center. The system evaluated, a Turbine Rotor Examination and Evaluation System (TREES), is used to perform ultrasonic examinations of turbine and generator rotors by transporting the ultrasonic transducers through the central bore hole in the rotor forging and directing the ultrasonic beams outward. The evaluation was a requirement of the purchase specification under which Southwest Research Institute built the system for Taiwan Power and was funded by Southwest Research Institute, accordingly. Rotor boremore » blocks containing surface-connected fatigue cracks, embedded glass beads, and embedded radial-axial disks were used in the evaluation. Ten independent scans of the blocks were conducted to provide sufficient data for a statistical evaluation. Included in the evaluation were statistical characterizations of the detection capabilities, flaw sizing and locating accuracy, and repeatability of the inspection system. The results of the evaluation and comparisons to an evaluation of an earlier TREES system are presented in this report. 5 refs., 12 figs., 4 tabs.« less
  • The feasibility of using a Fourier Transform Infrared (FTIR) spectrometer from an airborne platform for remote sensing of air pollution was investigated. Air Force Phillips Laboratory mounted a FTIR spectrometer into a small twin engine aircraft and obtained the data used in this investigation. The aircraft was flown over sections of New York and New England. The spectrometer was operated two different configurations, a passive configuration where the spectrometer viewed the warm ground and atmosphere below the aircraft, and an extractive mode where outside air was flushed through a 100 meter optical path gas cell. The spectral data were analyzedmore » at AIL Systems Inc. for the presence of atmospheric pollutants.« less
  • The purpose of this CRADA between LLNL and Kaman Aerospace/Raymond Engineering Operations (Raymond) was to demonstrate the feasibility of using Analog/Digital Neural Network (ANN) Technology for advanced signal processing, fuzing, and other applications. This cooperation sought to Ieverage the expertise and capabilities of both parties--Raymond to develop the signature recognition hardware system, using Raymond’s extensive experience in the area of system development plus Raymond’s knowledge of military applications, and LLNL to apply ANN and related technologies to an area of significant interest to the United States government. This CRADA effort was anticipated to be a three-year project consisting of threemore » phases: Phase I, Proof-of-Principle Demonstration; Phase II, Proof-of-Design, involving the development of a form-factored integrated sensor and ANN technology processo~ and Phase III, Final Design and Release of the integrated sensor and ANN fabrication process: Under Phase I, to be conducted during calendar year 1996, Raymond was to deliver to LLNL an architecture (design) for an ANN chip. LLNL was to translate the design into a stepper mask and to produce and test a prototype chip from the Raymond design.« less
  • A combined experimental and computational program was conducted to examine the heat transfer distribution in a turbine rotor passage geometrically similar to the Space Shuttle Main Engine (SSME) High Pressure Fuel Turbopump (HPFTP). Heat transfer was measured and computed for both the full span suction and pressure surfaces of the rotor airfoil as well as for the hub endwall surface. The objective of the program was to provide a benchmark-quality database for the assessment of rotor heat transfer computational techniques. The experimental portion of the study was conducted in a large scale, ambient temperature, rotating turbine model. The computational portionmore » consisted of the application of a well-posed parabolized Navier-Stokes analysis of the calculation of the three-dimensional viscous flow through ducts simulating a gas turbine package. The results of this assessment indicate that the procedure has the potential to predict the aerodynamics and the heat transfer in a gas turbine passage and can be used to develop detailed three dimensional turbulence models for the prediction of skin friction and heat transfer in complex three dimensional flow passages.« less
  • The National Renewable Energy Laboratory (NREL) installed two Advanced Research Turbines (ART) at the National Wind Technology Center near Boulder, Colorado, to use as full-scale test beds for ongoing research efforts, including three-dimensional blade aerodynamics and the effects of various control methods on turbine loads and performance. The Westinghouse WWG-0600 was selected as a baseline configuration for the ART turbines. The first turbine, ART-1, is currently operational and has been used to collect a baseline set of performance and loads data. A second turbine, ART-2A, incorporates several major modifications and may be upgraded further to a configuration designated aRT-2B. Possiblemore » features of the ART-2B turbine include a multi-degree of freedom hum and newly designed rotor blades. Global energy concepts, L.L.C. provided engineering support to NREL in designing the components for the ART-2B turbine. This document provides a summary of work performed by GEC on the aerodynamic design of ART-2B rotor blades.« less