Lidé na fakultě
Ing. Oldřich Štumbauer, Ph.D.

2024, New Trends in Civil Aviation: Proceedings of the 24th International Conference on New Trends in Civil Aviation 2024, Praha, České vysoké učení technické v Praze), p. 241-246), ISBN 978-80-01-07181-6, ISSN 2694-7854

Maintenance-related problems are one of the causal factors in microlight aircraft serious incidents and accidents. Maintenance of microlight aircraft in the Czech Republic is primarily the responsibility of the owner of the microlight aircraft and in the supervision of national regulator for microlight aircraft (a maximum weight of 600 kg) - the Light Aircraft Association (LAA) of the Czech Republic. The aim of this paper is to develop a set of systemic safety recommendations for the maintenance of microlight aircraft in the Czech Republic that could contribute to increase the level of aviation safety throughout the making of tailored safety constraints to deal with new microlight aircraft types or the transition of new users from general aviation to microlight aviation. For the definition of the safety recommendations, the STAMP model and the STPA methodology have been chosen as the most suitable for the complexity of the maintenance of the microlight aircraft. The STPA analysis was applied to the microlight

Stať ve sborníku z prestižní konf.

2022, Risk Analysis, 42 (10), ISSN 1539-6924

Evaluation of safety performance remains central to any safety and risk management. Currently, there are very few support tools and methods which allow for quantitative approach in this domain. One of the successful methods available to this end is the Aerospace Performance Factor (APF). The method is based on hierarchical clustering of taxonomy-based safety performance indicators, using simple and intelligible formula to compute the overall safety performance signal. The work presented in this study deals with one of the APF shortcomings, namely the absence of nonlinear relations among the performance indicators to capture more accurately the risk in the assessed system. It proposes an addition of new decision criteria behind the APF method as part of the application of Analytical Hierarchy Process (AHP), namely the impact of respective performance indicator on other indicators, regardless of their hierarchical structure. This addition leads to relative changes of performance indicators significance, where those with the highest potential for nonlinear interactions among the entire set of performance indicators are emphasized and the change in their weight ultimately leads to changes in the overall APF signal. The study results indicate that the extended APF signal is refined in terms of extremes and it draws more accurate picture about the actual safety performance, eventually supporting better identification of deviations from its acceptable values. The study was experimentally carried out in the aviation with data from the European Central Repository (ECR) originating from United Kingdom during the years 2013–2015 and verified further on data sets from Finland and Denmark.

Článek v periodiku excerpovaném SCI Expanded

2022

Tato zpráva pojednává o znalostních systémech v rámci hodnocení spolehlivosti a kvality letadlových systémů a komponent. Pod znalostním systémem se v praxi rozumí softwarový systém, který dokáže pracovat se znalostí a tu nabízet uživateli jako podporu v rámci jeho pracovních postupů, nebo jí přímo používat v automatizovaných procesech, kde znalostní systém simuluje rozhodování prováděné experty. Znalost se v počítačové terminologii považuje za nejvyšší formu organizace strukturovaných dat, která je daná prvky, jejich vlastnostmi a relacemi, popřípadě operacemi, které lze nad danými prvky vykonat. Vzniká zpracováním dat a informací, v rámci znalostních systémů se obvykle vyjadřuje explicitně a pro její tvorbu a uchování se využívá technologie ontologického inženýrství. Je nezbytná pro optimální rozhodování se v rámci řešení problémů.

Oponovaná výzkumná zpráva v češtině

2022, Transportation Research Procedia, Amsterdam, Elsevier B.V.), p. 256-264), ISSN 2352-1457

The paper describes the practical use of the system approach to the incident investigation at the international airport and why the airport focuses on new methods in safety engineering. The approach is shown on the test investigation of aircraft incident using the CAST methodology based on the STAMP model describing investigation steps and overall context. The outcome is compared with the traditional approach to investigation, and causal factors and safety recommendations are determined. A systemic approach significantly influences these recommendations positively. Traditional methods are proven over the years, but it is beneficial to complement them with a new approach to get the best possible lessons learned and the most effective recommendations and safety actions.

Stať ve sborníku z prestižní konf. (Scopus)

2021

Cílem projektu bylo vytvoření konceptu měření, analýzy a vyhodnocení psychofyziologické kondice pilotů jako potenciálního indikátoru selhání v závěrečné fázi přiblížení a přistání na letišti, s hlavním ohledem na analýzu variability srdečního rytmu, kvantifikaci EEG a modelování vizuální percepce. Koncept cílil na zvyšování bezpečnosti letecké dopravy tím, že umožní vyhodnocení psychofyziologické kondice a kognitivních schopností posádky ve fázi letu, která patří mezi nejrizikovější a nejvíce náchylné na nedostatky leteckého personálu. Dosažení konceptu umožní další zlepšování úrovně provozní bezpečnosti v letectví pomocí snížení rizika souvisejícího s jednotlivými úkony při přistání na letišti. Pro tyto účely byl vytvořen simulátor, který je schopen prostřednictvím virtuální reality simulovat let se společným sledováním pohybu očí ve scéně a sběr fyziologických dat. Výzkumná zpráva ukazuje na aktivity spojené s realizací tohoto zařízení, předzpracování zaznamenaných dat/signálů, jejich význam, způsob interpretace těchto dat a v neposlední řadě nastavení experimentálních měření a jejich evaluaci. Projekt probíhal od 06/2019 do 05/2021. V rámci řešení projektu vzhledem k pandemii Covid-19 neměl řešitelský tým kontinuální přístup na pracoviště a nebylo tak možné realizovat některé aktivity v plném, zamýšleném rozsahu. Tato situace trvala od 03/2020 do 03/2021 a dopadla především na měření zahrnující lidské subjekty, jejichž realizace nebyla možná vůbec nebo za velmi omezených podmínek. I přes uvedené problémy, vynaložil řešitelský tým značné úsilí pro úspěšné ukončení projektu a splnění všech závazků s ním spojených.

Oponovaná výzkumná zpráva v češtině

2020

This document provides an analysis of information extraction and semantic annotation techniques considered to be used in the implementation of the Reliability and Quality Knowledge System (RQKS) software prototype. Based on the results of the analysis, we create an ontology-based natural language processing (NLP) pipeline to support key use-cases of RQKS.

Výzkumná zpráva cizojazyčně

2020, Transportation Research Procedia, Linz, Elsevier BV), p. 37-45), ISSN 2352-1465

This article focuses on identifying limitations and deficiencies of reliability methods that are currently used in the aviation industry. The goal is to propose a solution to address these issues and, consequently, improve the way reliability analyses are carried in the industry. In collaboration with an aircraft engine manufacturer, Failure Mode and Effects Analysis (FMEA) of an aircraft engine lubrication system was carried the traditional way and with current tools used by the company. Reliability ontology suitable to carry the analysis in semi-automatic way was then proposed, implemented, and used with the same FMEA analysis. The results show that the ontology-based approach has significant potential for improving the consistency and overall quality of the reliability analyses in the aviation. This article details the process of development of an FMEA ontology model, case study of its application and the comparison of the traditional and the ontology-based approach.

Stať ve sborníku z prestižní konf. (Scopus)

2020, 2020 New Trends in Civil Aviation, Praha, IEEE Czechoslovakia Section), p. 99-103), ISBN 978-80-01-06726-0, ISSN 2694-7854

This paper deals with the operational issues of aircraft components and their reliability, from the perspective of the aircraft operators. Modern airliners are equipped with advanced ways of data collection of most flight and technical parameters that can be used to optimize their operations. This study deals with the pneumatic system (ATA36 chapter) of the B737NG aircraft that is susceptible to failures in the operations, leading to the aircraft becoming unserviceable for periods of time. A novel approach is proposed to analyze the system behavior by its modeling by means of the Unified Modeling Language (UML) and Fault-tree analysis, using real operational data. Next, this paper proposes simple operational measures than can avoid the aircraft on ground (AOG) states and decrease unexpected expenses due to the system failure. The results show that this new approach is very practical and can have significant effect on the airline operations, largely reducing extra costs and flight delays and allowing for better planning of aircraft maintenace.

Stať ve sborníku z prestižní konf. (Scopus)

2019, Safety & Security Conference Prague 2019, Praha, IRIS - Rudolf Valenta), p. 33-41), ISBN 978-80-907724-0-3

Due to current technological growth, the safety management system has evolved with complex systems. Complex causes of accidents often exceed the designation of traditional safety assessment techniques. One of the problems is the difficulty of examining all possible scenarios that may occur when combining system components, especially software products and people. In response to this problem, the paper presents conclusions from the implementation of the control structure in the field of civil aviation safety. The control structure model helps to identify hazards that may occur during processes on RWY. Further, the paper provides an evaluation of control structure changes by risk assessment and by mitigation potential of hazard. Using the mitigating potential of hazard verified that the changes have contributed to improving safety and Commission Regulation No. 139/2014 is met.

Stať ve sborníku z mezinár. konf. cizojazyčně

2019, TRANSPORT MEANS 2019 - PROCEEDINGS OF THE 23rd INTERNATIONAL SCIENTIFIC CONFERENCE, Kaunas, Kaunas University of Technology), p. 1020-1024), ISSN 1822-296X

This paper introduces a vector approach extension of basic and popular concept for risk evaluation tool - risk matrix. Due to the development of new risk analysis methods, it is appropriate to consider upgrades or extensions of the existing risk evaluation methods. Inspiration for the extension can be Failure Modes and Effect Analysis (FMEA). FMEA is a well-established method for safety and reliability improvement in various industries. A Risk Priority Number (RPN) is used by the method to evaluate risk and determine a failure mode priority in FMEA. However, RPN is not a sufficient tool for risk evaluation of the process deviations but it can be an inspiration for the extensions of risk matrix detectability. The extension requires a change in the evaluation and in the presentation of the results. Application of the vector display during the RPN evaluation process can be useful for the method accuracy and for the presentation of the results.

Stať ve sborníku z prestižní konf. (Scopus)

2018, Young Transportation Engineers Conference 2018, Praha, Fakulta dopravní), ISBN 978-80-01-06464-1

The paper aims to analyze and justify a need for more proactive airport safety data management. A numerous operations produce daily a large amount of operational data. Adequate data collection processes and understanding of their potential is currently a stumbling block for many airports. A concept of integrated airport management is not a new one however, modern trends brought a concept of wider data exploitation and analysis. It is an assumption that current airport management systems lack a structural application and utilization of such operational data, enabling on site decision making and proper immediate reactions to operational deviations.

Stať ve sborníku z mezinár. konf. cizojazyčně

2018, Safety & Security Conference Prague 2018, Praha, IRIS - Rudolf Valenta), p. 1-4), ISBN 978-80-904317-5-1

Flight operation can easily deviate from a normal safe process. These deviations can lead to an accident. Tracking the chain of event is foundation for safe system. Article attempts to find a way to monitor and evaluate process deviations. Bow-tie and Reason method is inspiration for safety barrier model. Barriers are classified by location and function in the system and use benefits of the barrier approach. Barrier classification and bow-tie method can be evaluated as a standard safety KPI and can be one piece of entire safety system.

Stať ve sborníku z mezinár. konf. cizojazyčně

2018, New Trends in Civil Aviation, Leiden, CRC Press/Balkema), p. 161-166), ISBN 978-0-8153-7602-6

In recent years, the development of air traffic management safety is focused on utilization of safety key performance indicators. The goal of this article is to propose better method for safety indicators system evaluation than Aerospace Performance Factor method used by European Organization for the Safety of Air Navigation now. In the newly designed method, we use analytical hierarchy process to divide system to clusters and elements of clusters and quantitative pairwise comparison of criteria to evaluate indicators. This comparison gives responders new possibilities to accurate evaluation against the pairwise comparison method used now. The new method gives us accurate indicators weighting and more precise results of system’s safety performance. Than it is better to decide how to invest effort and resources.

Stať ve sborníku z prestižní konf. (Scopus)

2018, Safety & Security Conference Prague 2018, Praha, IRIS - Rudolf Valenta), p. 71-77), ISBN 978-80-904317-5-1

Paper aims to provide brief view of risk assessment as an essential part of safety domain. Although safety studies are required by the Civil Aviation Authority (CAA) at this time for each new proposal and for each change with a possible impact of safety it is debatable whether there is currently a suitable tool for safety risk assessment of new proposals. Safety risk management is still permeated by simplistic methods based on risk matrices. Within this paper we will illustrate the issue of using risk matrix when considering a new proposal. This will be illustrated on the example of two specific safety studies from Prague Airport. Finally we will summarize the complete set of arguments and findings as an input to the research of a new approach to risk assessment in the context of safety studies.

Stať ve sborníku z mezinár. konf. cizojazyčně