Download or read book Effect of Individual Component Life Distribution on Engine Life Prediction written by National Aeronautics and Space Administration (NASA) and published by Createspace Independent Publishing Platform. This book was released on 2018-05-30 with total page 28 pages. Available in PDF, EPUB and Kindle. Book excerpt: The effect of individual engine component life distributions on engine life prediction was determined. A Weibull-based life and reliability analysis of the NASA Energy Efficient Engine was conducted. The engine s life at a 95 and 99.9 percent probability of survival was determined based upon the engine manufacturer s original life calculations and assumed values of each of the component s cumulative life distributions as represented by a Weibull slope. The lives of the high-pressure turbine (HPT) disks and blades were also evaluated individually and as a system in a similar manner. Knowing the statistical cumulative distribution of each engine component with reasonable engineering certainty is a condition precedent to predicting the life and reliability of an entire engine. The life of a system at a given reliability will be less than the lowest-lived component in the system at the same reliability (probability of survival). Where Weibull slopes of all the engine components are equal, the Weibull slope had a minimal effect on engine L(sub 0.1) life prediction. However, at a probability of survival of 95 percent (L(sub 5) life), life decreased with increasing Weibull slope.Zaretsky, Erwin V. and Hendricks, Robert C. and Soditus, Sherry M.Glenn Research CenterENGINE PARTS; LIFE (DURABILITY); TURBINE BLADES; PROBABILITY THEORY; STATISTICAL ANALYSIS; RELIABILITY ENGINEERING; AIRCRAFT ENGINES; WEIBULL DENSITY FUNCTIONS; HIGH PRESSURE; STEADY STATE; SYSTEM EFFECTIVENESS; AIRCRAFT PERFORMANCE

Download or read book Effect of Individual Component Life Distribution on Engine Life Prediction written by and published by . This book was released on 2003 with total page 28 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Effect of Individual Component Life Distribution on Engine Life Prediction written by EV. Zaretsky and published by . This book was released on 2004 with total page 18 pages. Available in PDF, EPUB and Kindle. Book excerpt: The effect of individual engine component life distributions on engine life prediction was determined. A Weibull-based life and reliability analysis of the NASA Energy Efficient Engine was conducted. The engine's life at a 95 and 99.9 % probability of survival was determined based on the engine manufacturer's original life calculations and assumed values of each of the component's cumulative life distributions as represented by a Weibull slope. The lives of the high-pressure turbine (HPT) disks and blades also were evaluated individually and as a system in a similar manner. Knowing the statistical cumulative distribution of each engine component with reasonable engineering certainty is a condition precedent to predicting the life and reliability of an entire engine. The life of a system at a given reliability will be less than the lowest-lived component in the system at the same reliability (probability of survival). Where Weibull slopes of all the engine components are equal, the Weibull slope had a minimal effect on engine L0.1 life prediction. However, at a probability of survival of 95% (L5 life), life decreased with increasing Weibull slope.

Download or read book Probabilistic Aspects of Life Prediction written by W. Steven Johnson and published by ASTM International. This book was released on 2004 with total page 292 pages. Available in PDF, EPUB and Kindle. Book excerpt: As fatigue and fracture mechanics approaches are used more often for determining the useful life and/or inspection intervals for complex structures, realization sets-in that all factors are not well known or characterized. Indeed, inherent scatter exists in initial material quality and in material performance. Furthermore, projections of component usage in determination of applied stresses are inexact at best and are subject to much discrepancy between projected and actual usage. Even the models for predicting life contain inherent sources of error based on assumptions and/or empirically fitted parameters. All of these factors need to be accounted for to determine a distribution of potential lives based on combination of the aforementioned variables, as well as other factors. The purpose of this symposium was to create a forum for assessment of the state-of-the-art in incorporating these uncertainties and inherent scatter into systematic probabilistic methods for conducting life assessment.

Download or read book Probabilistic Aspects of Life Prediction written by and published by ASTM International. This book was released on with total page 279 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Forensic Systems Engineering written by William A. Stimson and published by John Wiley & Sons. This book was released on 2017-12-27 with total page 368 pages. Available in PDF, EPUB and Kindle. Book excerpt: A systems-level approach to reducing liability through process improvement Forensic Systems Analysis: Evaluating Operations by Discovery presents a systematic framework for uncovering and resolving problematic process failures. Carefully building the causal relationship from process to product, the discussion lays out in significant detail the appropriate and tactical approaches necessary to the pursuit of litigation with respect to corporate operations. Systemic process failures are addressed by flipping process improvement models to study both improvement and failure, resulting in arguments and methodologies relevant to any product or service industry. Guidance on risk analysis of operations combines evaluation of process control, stability, capability, verification, validation, specification, product reliability, serial dependence, and more, providing a robust framework with which to target large-scale nonconforming products and services. Relevant to anyone involved in business, manufacturing, service, and control, this book: Covers process liability and operations management from both engineering and legal perspectives Offers analyses that present novel uses of traditional engineering methods concerning risk and product quality and reliability Takes a rigorous approach to system tactics and constraints related to product and service operations and identifies dysfunctional processes Offers both prescriptive and descriptive solutions to both the plaintiff and the defendant The global economy has created an environment in which huge production volume, complex data bases, and multiple dispersed suppliers greatly challenge industrial operations. This informative guide provides a practical blueprint for uncovering problematic process failures.

Download or read book Fatigue Design and Reliability written by G. Marquis and published by Elsevier. This book was released on 1999-02-19 with total page 251 pages. Available in PDF, EPUB and Kindle. Book excerpt: This volume represents a selection of papers presented at the Third International Symposium on Fatigue Design, Fatigue Design 1998, held in Espoo, Finland, 26-29 May, 1998.One objective of this symposium series was to help bridge the gap that sometimes exists between researchers and engineers responsible for designing components against fatigue failure. The 21 selected papers provide an up-to-date survey of engineering practice and a preview of design methods that are advancing toward application. Reliability was selected as a key theme for FD'98. During the design of components and structures, it is not sufficient to combine mean material properties, average usage parameters, and pre-selected safety factors. The engineer must also consider potential scatter in material properties, different end users, manufacturing tolerances and uncertainties in fatigue damage models. Judgement must also be made about the consequences of potential failure and the required degree of reliability for the structure or component during its service life. Approaches to ensuring reliability may vary greatly depending on the structure being designed. Papers in this volume intentionally provide a multidisciplinary perspective on the issue. Authors represent the ground vehicle, heavy equipment, power generation, ship building and other industries. Identical solutions cannot be used in all cases because design methods must always provide a balance between accuracy and simplicity. The point of balance will shift depending on the type of input data available and the component being considered.

Download or read book Weibull Based Design Methodology for Rotating Aircraft Engine Structures written by and published by . This book was released on 2002 with total page 28 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Scientific and Technical Aerospace Reports written by and published by . This book was released on 1995 with total page 702 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Materials Lifetime Science and Engineering written by The Minerals, Metals & Materials Society (TMS) and published by John Wiley & Sons. This book was released on 2013-09-19 with total page 345 pages. Available in PDF, EPUB and Kindle. Book excerpt: Materials Lifetime Science and Engineering ...

Download or read book NASA Technical Memorandum written by and published by . This book was released on 1994 with total page 492 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Engine Structures written by and published by . This book was released on 1988 with total page 232 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Ceramic Gas Turbine Component Development and Characterization written by Mark Van Roode and published by American Society of Mechanical Engineers. This book was released on 2003 with total page 800 pages. Available in PDF, EPUB and Kindle. Book excerpt: Focusing on the work of component suppliers and materials characterization laboratories, this book provides a valuable insider's view of ceramic gas turbine development over the last two decades. Contributors who have been intimately involved with the manufacture and characterization of advanced ceramics for gas turbine-related work, share their first-hand experience and lessons learned. These important perspectives have led to improved materials and the development of new techniques to assess life prediction. This volume includes an insightful retrospective and examines the current status and prognosis of the industry, along with its future needs. This book will be of interest to engineering and management personnel at turbomachinery equipment manufacturers, suppliers of ceramic materials and components, researchers in government and private laboratories, university teaching staff and students, and personnel involved in planning and monitoring technology development programs.

Download or read book Applied Mechanics Reviews written by and published by . This book was released on 1992 with total page 348 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Energy Research Abstracts written by and published by . This book was released on 1988 with total page 752 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book NASA Tech Briefs written by and published by . This book was released on 1995 with total page 716 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Reliability Abstracts and Technical Reviews written by and published by . This book was released on 1967 with total page 644 pages. Available in PDF, EPUB and Kindle. Book excerpt: