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1 – 10 of over 10000
Article
Publication date: 5 September 2008

Seref Demirci, Chingiz Hajiyev and Andreas Schwenke

The purpose of this paper is to develop an automated engine health monitoring system (AEHMS) for commercial aircraft.

1542

Abstract

Purpose

The purpose of this paper is to develop an automated engine health monitoring system (AEHMS) for commercial aircraft.

Design/methodology/approach

The AEHMS is developed by using fuzzy logic. The input of the fuzzy logic is engine performance parameters gathered from aircraft for every flight during cruise. The fuzzy rule inference system for different engine faults is based on expert knowledge and real life data in the Turkish Airlines fleet. The very smallest is used for defuzzification, since it provides a more meaningful result than others. The complete loop of engine health monitoring (EHM) is automatically performed by the programs and Fuzzy Logic Toolbox in MATLAB. The system produces output values between 0 – faulty and 1 – not faulty for every fault or deterioration on a time series. The program triggers an alert if any output exceeds a specified value. Finally, the method is utilized for monitoring the engines in the Turkish Airlines fleet.

Findings

Health monitoring has been a very popular subject to increase aircraft availability with the minimum maintenance cost. Fuzzy logic is a very useful method for automated health monitoring strategies.

Research limitations/implications

It does not provide long‐term engine maintenance decisions such as scheduling overhaul times, predicting the remaining life of the engine components.

Originality/value

The paper provides a robust method for EHM with the application to real aircraft data. The AEHMS can greatly simplify the EHM system for airlines and minimizes its drawbacks, such as extra labor hours, human error and requirement for engineering expertise.

Details

Aircraft Engineering and Aerospace Technology, vol. 80 no. 5
Type: Research Article
ISSN: 0002-2667

Keywords

Article
Publication date: 2 December 2019

Bartosz Stanisław Przybyła, Radoslaw Przysowa and Zbigniew Zapałowicz

EC-135P2+ helicopters operated by Polish Medical Air Rescue are highly exposed to environmental particles entering engines when performing helicopter emergency medical…

Abstract

Purpose

EC-135P2+ helicopters operated by Polish Medical Air Rescue are highly exposed to environmental particles entering engines when performing helicopter emergency medical services. This paper aims to assess the effectiveness of inlet barrier filters installed to protect the engines, including their impact on maintenance.

Design/methodology/approach

The organisation adopted a comprehensive set of measures to predict and limit the impact of dust ingestion including visual inspections, health management and engine trend monitoring based on ground power checks’ (GPC) results. Three alternative particle separation solutions were considered. Finally, helicopter inlets were modified to allow the selected filter system to be installed, which reduced the number of particles ingested by the engine and prevented from premature overhauls.

Findings

The analyses carried out enabled not only the selection of the optimal filtration solution and its seamless implementation into the fleet but also confirmed its efficiency. After installing the filters, engines’ lifetime is extended from 500 to 4,500 flight hours while operating costs and the number of maintenance tasks was reduced significantly.

Originality/value

Lessons learned from operational experience show that a well-matched particle separation system can mitigate accelerated engine deterioration even if the platform is continuously exposed to environmental particles. The remaining useful life of engines can be predicted using performance models and data from GPC.

Details

Aircraft Engineering and Aerospace Technology, vol. 92 no. 1
Type: Research Article
ISSN: 1748-8842

Keywords

Article
Publication date: 19 June 2018

Emre Kiyak, Gulay Unal and Nilgun Fazilet Ozer

This paper aims to discuss engine health monitoring for unmanned aerial vehicles. It is intended to make consistent predictions about the future status of the engine

Abstract

Purpose

This paper aims to discuss engine health monitoring for unmanned aerial vehicles. It is intended to make consistent predictions about the future status of the engine performance parameters by using their current states.

Design/methodology/approach

The aim is to minimize risks before they turn into problems. In accordance with these objectives, temporal and financial savings are planned to be achieved by contributing processes such as extending the engine life, preventing early disassembly-reassembly and mechanical wears and reducing the maintenance costs. Based on this point of view, a data-based software is developed in MATLAB (Matrix Laboratory) program for the so-called process.

Findings

The software is operated for the performance parameters of the turbojet engine that is used in a small unmanned aerial vehicle of Tusas Engine Industry. The obtained results are compared with the real data of the engine. As a result of this comparison, a fault that may occur in the engine can be detected before being determined.

Originality/value

It is clearly demonstrated that the engine operation in adverse conditions can be prevented. This situation means that the software developed operates successfully.

Details

Aircraft Engineering and Aerospace Technology, vol. 90 no. 5
Type: Research Article
ISSN: 1748-8842

Keywords

Article
Publication date: 14 June 2021

Jiachen Guo, Heng Jiang, Zhirong Zhong, Hongfu Zuo and Huan Zhang

Electrostatic monitoring technology is a useful tool for monitoring and detecting component faults and degradation, which is necessary for engine health management. This…

Abstract

Purpose

Electrostatic monitoring technology is a useful tool for monitoring and detecting component faults and degradation, which is necessary for engine health management. This paper aims to carry out online monitoring experiments of turbo-shaft engine to contribute to the practical application of electrostatic sensor in aero-engine.

Design/methodology/approach

Combined with the time and frequency domain methods of signal processing, the authors analyze the electrostatic signal from the short timescale and the long timescale.

Findings

The short timescale analysis verifies that electrostatic sensor is sensitive to the additional increased charged particles caused by abnormal conditions, which makes this technology to monitor typical failures in aero-engine gas path. The long scale analysis verifies the electrostatic sensor has the ability to monitor the degradation of the engine gas path performance, and water washing has a great impact on the electrostatic signal. The spectrum of the electrostatic signal contains not only the motion information of the charged particles but also the rotating speed information of the free turbine.

Practical implications

The findings in this article prove the effectiveness of electrostatic monitoring and contribute to the application of this technology to aero-engine.

Originality/value

The research in this paper would be the foundation to achieve the application of the technology in aero-engine.

Details

Aircraft Engineering and Aerospace Technology, vol. 93 no. 5
Type: Research Article
ISSN: 1748-8842

Keywords

Article
Publication date: 7 March 2016

Tonci Grubic and Joe Peppard

Remote monitoring technology (RMT) is widely acknowledged as an important enabler of servitisation however, there is a dearth of understanding about how RMT is used by…

1429

Abstract

Purpose

Remote monitoring technology (RMT) is widely acknowledged as an important enabler of servitisation however, there is a dearth of understanding about how RMT is used by manufacturing firms to support servitised strategies. The purpose of this paper is to contribute to this important yet somewhat ignored topic in servitisation research. It attempts to address the following questions: what has constrained, and what has enabled the exploitation of RMT in the context of servitised strategies?

Design/methodology/approach

The research adopts an exploratory multiple-case study design. Four in-depth descriptive case studies of companies operating in aerospace, industrial equipment, marine, and transport sectors were conducted. The collected data were analysed and synthesised, drawing out conclusions.

Findings

The study describes how four manufacturers are using RMT and identifies ten factors that have enabled and constrained the realisation of expected outcomes. The enabling factors identified include: skills, experience, and knowledge; support from customers and other complementary data sources, processes, and structures; operations centres; historical data; and presence of in-house knowledge and capabilities. While the constraining factors include: defining benefits of RMT; limitations of RMT; limited understanding about true capabilities of RMT; knowledge management; and lack of alignment between services and manufacturing strategies.

Research limitations/implications

While considerable attention and effort have been invested in designing and conducting the research and analysing the data from the case studies, more empirical work is required to validate and enrich findings and conclusions. For this purpose several research questions to guide further theory development in this area are formulated.

Originality/value

This paper is an in-depth study examining the role of RMT in supporting servitised strategies. In particular, it explores how this technology is used in practice to support service-oriented value propositions of manufacturers and identifies the factors that are key to successfully executing this strategy. As such it qualifies as one of the first studies of this kind.

Details

Journal of Manufacturing Technology Management, vol. 27 no. 2
Type: Research Article
ISSN: 1741-038X

Keywords

Article
Publication date: 1 August 1992

AEM will be exhibiting in Hall 4, Stand G1. The exhibit will illustrate AEM's comprehensive range of accessory repair and overhaul services for electrical, hydraulic…

Abstract

AEM will be exhibiting in Hall 4, Stand G1. The exhibit will illustrate AEM's comprehensive range of accessory repair and overhaul services for electrical, hydraulic, avionic and safety equipment. Farnborough will also be used as the official launch of AEM's Boeing 737 Landing Gear Total Support Pro‐gramme, which encompasses a complete exchange and overhaul service. Copies of Aviation Accessory News will be available on the stand.

Details

Aircraft Engineering and Aerospace Technology, vol. 64 no. 8
Type: Research Article
ISSN: 0002-2667

Article
Publication date: 16 January 2019

Maria Grazia De Giorgi, Antonio Ficarella and Laura De Carlo

The purpose of this paper is to propose and develop artificially intelligent methodologies to discover degradation trends through the detection of engine’s status. The…

Abstract

Purpose

The purpose of this paper is to propose and develop artificially intelligent methodologies to discover degradation trends through the detection of engine’s status. The objective is to predict these trends by studying their effects on the engine measurable parameters.

Design/methodology/approach

The method is based on the implementation of an artificial neural network (ANN) trained with well-known cases referred to real conditions, able to recognize degradation because of two main gas turbine engine deterioration effects: erosion and fouling. Three different scenarios are considered: compressor fouling, turbine erosion and presence of both degraded conditions. The work consists of three parts: the first one contains the mathematical model of real jet engine in healthy and degraded conditions, the second step is the optimization of ANN for engine performance prediction and the last part deals with the application of ANN for prediction of engine fault.

Findings

This study shows that the proposed diagnostic approach has good potential to provide valuable estimation of engine status.

Practical implications

Knowledge of the true state of the engine is important to assess its performance capability to meet the operational and maintenance requirements and costs.

Originality/value

The main advantage is that the engine performance data for model validation were obtained from real flight conditions of the engine VIPER 632-43.

Details

Aircraft Engineering and Aerospace Technology, vol. 92 no. 3
Type: Research Article
ISSN: 1748-8842

Keywords

Article
Publication date: 28 January 2014

Tonci Grubic

Servitization centres on the transfer of risks from the customer to manufacturer. By providing real-time information about current and predicted health of a product in the…

3463

Abstract

Purpose

Servitization centres on the transfer of risks from the customer to manufacturer. By providing real-time information about current and predicted health of a product in the field, remote monitoring technology can mitigate some of those risks. Although recognised as one of the key enablers of servitization, the mainstream servitization research community has shown very little interest in this topic. The aim is to identify and critically analyse relevant research addressing the topic of remote monitoring technology and servitization and, based on this analysis, propose an agenda to guide future research in this area.

Design/methodology/approach

The methodology adopted is literature review consisting of three steps: define purpose and research questions, select keywords and databases, and identify and analyse relevant papers.

Findings

Ten findings have been made, which characterise current state of research under categories of examples, benefits, and challenges of using remote monitoring technology to support servitized strategies. Several areas that call for further research are suggested, but general impression is that the understanding about the role and contribution of remote monitoring technology in service delivery and strategy is still in its infancy and much greater effort will have to be invested to change this. It is also suggested that this technology holds a great potential for service and business model innovation; hence, more research is needed to further the knowledge about these topics.

Originality/value

This paper qualifies as the first attempt to consolidate and analyse relevant research at the intersection of servitization and remote monitoring technology.

Details

Journal of Manufacturing Technology Management, vol. 25 no. 1
Type: Research Article
ISSN: 1741-038X

Keywords

Article
Publication date: 6 March 2017

Isil Yazar, Tolga Yasa and Emre Kiyak

An aircraft engine control system consists of a large scale of control parameters and variables because of the complex structure of aero-engine. Monitoring and adjusting…

2249

Abstract

Purpose

An aircraft engine control system consists of a large scale of control parameters and variables because of the complex structure of aero-engine. Monitoring and adjusting control variables and parameters such as detecting, isolating and reconfiguring the system faults/failures depend on the controller design. Developing a robust controller is based on an accurate mathematical model.

Design/methodology/approach

In this study, a small-scale turboprop engine is modeled. Simulation is carried out on MATLAB/Simulink for design and off-design operating conditions. Both steady-state and transient conditions (from idle to maximum thrust levels) are tested. The performance parameters of compressor and turbine components are predicted via trained Neuro-Fuzzy model (ANFIS) based on component maps. Temperature, rotational speed, mass flow, pressure and other parameters are generated by using thermodynamic formulas and conservation laws. Considering these calculated values, error calculations are made and compared with the cycle data of the engine at the related simulation conditions.

Findings

Simulation results show that the designed engine model’s simulation values have acceptable accuracy for both design and off-design conditions from idle to maximum power operating envelope considering cycle data. The designed engine model can be adapted to other types of gas turbine engines.

Originality/value

Different from other literature studies, in this work, a small-scale turboprop engine is modeled. Furthermore, for performance prediction of compressor and turbine components, ANFIS structure is applied.

Details

Aircraft Engineering and Aerospace Technology, vol. 89 no. 2
Type: Research Article
ISSN: 1748-8842

Keywords

Open Access
Article
Publication date: 10 August 2018

Yishou Wang, Zhibin Han, Tian Gao and Xinlin Qing

The purpose of this study is to develop a cylindrical capacitive sensor that has the advantages of high resolution, small size and designability and can be easily…

1448

Abstract

Purpose

The purpose of this study is to develop a cylindrical capacitive sensor that has the advantages of high resolution, small size and designability and can be easily installed on lubricant pipeline to monitor lubricant oil debris.

Design/methodology/approach

A theoretical model of the cylindrical capacitive sensor is presented to analyze several parameters’ effectiveness on the performance of sensor. Numerical simulations are then conducted to determine the optimal parameters for preliminary experiments. Experiments are finally carried out to demonstrate the detectability of developed capacitive sensors.

Findings

It is clear from experimental results that the developed capacitive sensor can monitor the debris in lubricant oil well, and the capacitance values increase almost linearly when the number and size of debris increase.

Research limitations/implications

There is lot of further work to do to apply the presented method into the application. Especially, it is necessary to consider several factors’ influence on monitoring results. These factors include the flow rate of the lubricant oil, the temperature, the debris distribution and the vibration. Moreover, future work should consider the influence of the oil degradation to the capacitance change and other contaminations (e.g. water and dust).

Practical implications

This work conducts a feasibility study on application of capacitive sensing principle for detecting debris in aero engine lubricant oil.

Originality/value

The novelty of the presented capacitance sensor can be summarized into two aspects. One is that the sensor structure is simple and characterized by two coaxial cylinders as electrodes, while conventional capacitive sensors are composed of two parallel plates as electrodes. The other is that sensing mechanism and physical model of the presented sensor is verified and validated by the simulation and experiment.

Details

Industrial Lubrication and Tribology, vol. 70 no. 7
Type: Research Article
ISSN: 0036-8792

Keywords

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