Author: Vsevolod Kharyton
Publisher:
ISBN:
Category :
Languages : en
Pages : 206
Get Book Here
Book Description
The general aim of the study is to offer mathematical model of the process, which can allow crack identification in the compressor or turbine blade of aircraft gas-turbine engine in operation. Within the frameworks of this goal cracked blade non-linear dynamic model was elaborated and introduced to the global model of the bladed disk. Crack induced non-linearity was taken into account applying contact analysis elements in conjunction with harmonic balance method. For system size reduction the sub-structuring methodology using fixed-interface method was applied. It supposes the crack location to be considered as interface between two dependent, in this case, substructures. Such approach was applied to the both uncoupled cracked blade and bladed disk models. Also considering uncoupled cracked blade the centrifugal forces effect was examined. It was concluded, that depending on crack properties (location and size), it will be enough to use the linear crack presence formulation supposing crack to be always open (initial gap). During simulation of the bladed disk forced response containing cracked blade the effect of blade mistuning was simulated. Simulation results shown that at certain level of mistuning it becomes impossible to separate cracked blade response. Furthermore such crack detectability decreases with absence of cracked blade frequency localization. The last one phenomenon is very important diagnostic sign, which simplifies cracked blade detection at almost all cases. The last phase of the work was devoted to simulation of blade tip-timing method application for cracked blade identification. It consisted in blade arriving time generation, blade tip amplitudes reconstruction and bladed disk frequency response calculation on the base of measured (simulated) time data. Such approach allowed us to identify cracked blade in the same way as in frequency response analysis. Generally speaking, blade tip-timing method can be used as the part of engine health monitoring system for compressor or turbine blades dynamic performances monitoring.
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 18
Get Book Here
Book Description
In this paper, a bank of Kalman filters is applied to aircraft gas turbine engine sensor and actuator fault detection and isolation (FDI) in conjunction with the detection of component faults. This approach uses multiple Kalman filters, each of which is designed for detecting a specific sensor or actuator fault. In the event that a fault does occur, all filters except the one using the correct hypothesis will produce large estimation errors, thereby isolating the specific fault. In the meantime, a set of parameters that indicate engine component performance is estimated for the detection of abrupt degradation. The proposed FDI approach is applied to a nonlinear engine simulation at nominal and aged conditions, and the evaluation results for various engine faults at cruise operating conditions are given. The ability of the proposed approach to reliably detect and isolate sensor and actuator faults is demonstrated. (7 tables, 4 figures, 17 refs.).
Author: National Aeronautics and Space Administration (NASA)
Publisher: Createspace Independent Publishing Platform
ISBN: 9781720375425
Category :
Languages : en
Pages : 40
Get Book Here
Book Description
In this report, a fault detection and isolation (FDI) system which utilizes a bank of Kalman filters is developed for aircraft engine sensor and actuator FDI in conjunction with the detection of component faults. This FDI approach uses multiple Kalman filters, each of which is designed based on a specific hypothesis for detecting a specific sensor or actuator fault. In the event that a fault does occur, all filters except the one using the correct hypothesis will produce large estimation errors, from which a specific fault is isolated. In the meantime, a set of parameters that indicate engine component performance is estimated for the detection of abrupt degradation. The performance of the FDI system is evaluated against a nonlinear engine simulation for various engine faults at cruise operating conditions. In order to mimic the real engine environment, the nonlinear simulation is executed not only at the nominal, or healthy, condition but also at aged conditions. When the FDI system designed at the healthy condition is applied to an aged engine, the effectiveness of the FDI system is impacted by the mismatch in the engine health condition. Depending on its severity, this mismatch can cause the FDI system to generate incorrect diagnostic results, such as false alarms and missed detections. To partially recover the nominal performance, two approaches, which incorporate information regarding the engine s aging condition in the FDI system, will be discussed and evaluated. The results indicate that the proposed FDI system is promising for reliable diagnostics of aircraft engines.Kobayashi, Takahisa and Simon, Donald L. (Technical Monitor)Glenn Research CenterAIRCRAFT ENGINES; FAULT DETECTION; KALMAN FILTERS; SYSTEMS HEALTH MONITORING; SENSORS; ACTUATORS; COMPONENT RELIABILITY; NONLINEARITY; COMPUTERIZED SIMULATION; DEGRADATION; ENGINE PARTS; ERROR ANALYSIS; PROPULSION SYSTEM PERFORMANCE; STEADY STATE
Author: Fausto Pedro García Márquez
Publisher: BoD – Books on Demand
ISBN: 1789842131
Category : Mathematics
Languages : en
Pages : 177
Get Book Here
Book Description
This book presents the main concepts, state of the art, advances, and case studies of fault detection, diagnosis, and prognosis. This topic is a critical variable in industry to reach and maintain competitiveness. Therefore, proper management of the corrective, predictive, and preventive politics in any industry is required. This book complements other subdisciplines such as economics, finance, marketing, decision and risk analysis, engineering, etc. The book presents real case studies in multiple disciplines. It considers the main topics using prognostic and subdiscipline techniques. It is essential to link these topics with the areas of finance, scheduling, resources, downtime, etc. to increase productivity, profitability, maintainability, reliability, safety, and availability, and reduce costs and downtime. Advances in mathematics, modeling, computational techniques, dynamic analysis, etc. are employed analytically. Computational techniques, dynamic analysis, probabilistic methods, and mathematical optimization techniques are expertly blended to support the analysis of prognostic problems with defined constraints and requirements. The book is intended for graduate students and professionals in industrial engineering, business administration, industrial organization, operations management, applied microeconomics, and the decisions sciences, either studying maintenance or needing to solve large, specific, and complex maintenance management problems as part of their jobs. The work will also be of interest to researches from academia.
Author: Cengiz Kahraman
Publisher: Springer Nature
ISBN: 3031671953
Category :
Languages : en
Pages : 812
Get Book Here
Book Description
Author: Imal Liyanage
Publisher:
ISBN: 9783668054127
Category :
Languages : de
Pages : 64
Get Book Here
Book Description
Bachelor Thesis from the year 2015 in the subject Engineering - Aerospace Technology, grade: First class, Coventry University, course: Aerospace Engineering, language: English, abstract: This report paper explains the roll of a turbine blade and its analysis in today's jet engines. The report first discusses all the relevant information about how the conclusion of the turbine blade was reached from all the other probable components in the engine, then it moves on the full analysis of the turbine blade. Discussing about the maintenance and testing of the blade to see where the industry is and where its heading, then it moves on to the failure analysis. This shows the major pitfalls in the design of the blade and if a failure occurs, how the aircraft I built to react to such an incident. Material inspection and possible causes of failure is also discussed next, deformation characteristics due to thermally induced stress and new methods to prevent such failures is looked into.
Author:
Publisher:
ISBN:
Category : Hydraulic engineering
Languages : en
Pages : 600
Get Book Here
Book Description
The Army AH-64A Helicopter Systems Theory of Operation manual (TM 1-1520-238-T-9) may be used in conjunction with the wiring information in the Army AH-64A Helicopter Wiring Diagrams manual to troubleshoot any fault not isolated by the appropriate maintenance operational check and the associated fault isolation procedures. It provides troubleshooting information and theory of operation information for the Army AH-64A Helicopter only.
Author: Igor Kabashkin
Publisher: Springer
ISBN: 3319744542
Category : Technology & Engineering
Languages : en
Pages : 677
Get Book Here
Book Description
This book reports on cutting-edge theories and methods for analyzing complex systems, such as transportation and communication networks and discusses multi-disciplinary approaches to dependability problems encountered when dealing with complex systems in practice. The book presents the most noteworthy methods and results discussed at the International Conference on Reliability and Statistics in Transportation and Communication (RelStat), which took place in Riga, Latvia on October 18 – 21, 2017. It spans a broad spectrum of topics, from mathematical models and design methodologies, to software engineering and data security issues, as well as practical problems in technical systems, such as transportation, and telecommunications.
Author:
Publisher:
ISBN:
Category : Aeronautics
Languages : en
Pages : 702
Get Book Here
Book Description
Author: Christopher Lane
Publisher: Springer Science & Business Media
ISBN: 3319025171
Category : Technology & Engineering
Languages : en
Pages : 141
Get Book Here
Book Description
This thesis describes the development of a new technique to solve an important industrial inspection requirement for a high-value jet-engine component. The work – and the story told in the thesis – stretches all the way from the fundamentals of wave propagation in anisotropic material and ultrasonic array imaging through to device production and site trials. The book includes a description of a new method to determine crystallographic orientation from 2D ultrasonic array data. Another new method is described that enables volumetric images of an anisotropic material to be generated from 2D ultrasonic array data, based on measured crystallographic orientation. After extensive modeling, a suitable 2D array and deployment fixtures were manufactured and tested on in situ turbine blades in real engines. The final site trial indicated an order of magnitude improvement over the best existing technique in the detectability of a certain type of root cracking. The Development of a 2D Ultrasonic Array Inspection for Single Crystal Turbine Blades should be an inspiration for those starting out on doctoral degrees as it shows the complete development cycle from basic science to industrial usage.
