scholarly journals Aeroelastic Assessments and Functional Hazard Analysis of a Regional Aircraft Equipped with Morphing Winglets

Aerospace ◽  
2019 ◽  
Vol 6 (10) ◽  
pp. 104 ◽  
Author(s):  
Noviello ◽  
Dimino ◽  
Concilio ◽  
Amoroso ◽  
Pecora

The application of morphing wing devices can bring several benefits in terms of aircraft performance, as the current literature shows. Within the scope of Clean Sky 2 AirGreen 2 European project, the authors provided a safety-driven design of an adaptive winglet, through the examination of potential hazards resulting from operational faults, such as actuation chain jamming or links structural fails. The main goal of this study was to verify whether the morphing winglet systems could comply with the standard civil flight safety regulations and airworthiness requirements (EASA CS25). Systems functions were firstly performed from a quality point of view at both aircraft and subsystem levels to detect potential design, crew and maintenance faults, as well as risks due to the external environment. The severity of the hazard effects was thus identified and then sorted in specific classes, representative of the maximum acceptable probability of occurrence for a single event, in association with safety design objectives. Fault trees were finally developed to assess the compliance of the system structures to the quantitative safety requirements deriving from the Fault and Hazard Analyses (FHAs). The same failure scenarios studied through FHAs have been simulated in flutter analyses performed to verify the aeroelastic effects due to the loss of the actuators or structural links at aircraft level. Obtained results were used to suggest a design solution to be implemented in the next loop of design of the morphing winglet.

1980 ◽  
Vol 13 (8) ◽  
pp. 283-283 ◽  

The British Pressure Gauge Manufacturers Association has always emphasised the need for strict observance of recognised safety requirements when using pressure gauges. Unfortunately, gauges are both available and used that do not meet the rigid safety regulations laid down in British Standard 1780 and this could lead to serious accidents. The provisions of the Health and Safety at Work Act coupled with the strengthened proposals for Product Liability will place a greater statutory responsibility upon the manufacturer and user alike. The Association has therefore prepared the following statement:


Aviation ◽  
2012 ◽  
Vol 16 (4) ◽  
pp. 130-135
Author(s):  
Vaidotas Kondroška ◽  
Jonas Stankūnas

This work reviews the innovative and progressive methods of determination and analysis of safety objectives using Vilnius A-SMGCS example. The aim of the analysis is to determine how failures in this system could affect flight safety in Vilnius aerodrome. Identified safety objectives will limit the frequency of occurrence of hazards enough for the associated risk to be acceptable, and will ensure that appropriate mitigation means are reflected subsequently as Safety Requirements for the system. Analysis reflects aspects of A-SMGCS Safety objectives, which should be taken into consideration. Santrauka Darbe apžvelgiami progresyvūs saugos tikslų analizės metodai pagal Vilniaus aerodromo automatizuotos antžeminio eismo stebėjimo ir kontrolės sistemos veiklos pavyzdį. Analizuojama, kaip šios sistemos sutrikimai gali paveikti skrydžių saugą Vilniaus aerodrome. Remiantis galimų pavojų skrydžių saugai analize, tyrime nustatyti saugos tikslai, pagal kuriuos vėliau bus numatomos riziką mažinančios priemonės (galimų pavojų neutralizavimui ar kylančios rizikos sumažinimui iki priimtino lygio). Straipsnyje pateikiami veiksniai, kuriuos reikėtų įvertinti nustatant aerodromo automatizuotos antžeminio eismo stebėjimo ir kontrolės sistemos saugos tikslus.


Author(s):  
Mykhailo Prodanchuk

Purpose. Problems of the existing theory, methodology and organization of accounting need to be solved taking into account practical requirements of modern management. In turn, this provides an opportunity to expand the functionality of accounting to make informed decisions, focused on achieving the efficiency of business operations and maximize the value of business, which contributes to the increased importance of accounting in management. This testifies to the relevance of the chosen topic , which determined the directions of the research, which requires in-depth scientific research, its scientific-methodological and practical importance. Purpose. The purpose of the article is to systematize existing approaches and to improve the classification of accounting functions in accordance with the requirements of the management system. Methods. In the process of researching the growth of accounting functionality in the management of agrarian business used general scientific methods of knowledge of reality, including: structural-logical and semantic analysis - to clarify and streamline the terminology in the conceptual apparatus; induction and deduction - for parameterization of accounting functionality in management; grouping and classification - to develop methodological principles and systematize the classification features of accounting functions. The research is based on general and specific methods of studying the economic processes, facts and phenomena of management requests for increasing the functionality of accounting for agricultural business management. The scientific base of the research was scientific works of domestic and foreign scientists on accounting functions in the management system, materials of international scientific-practical conferences and seminars, results of personal experience and observations. Results. Accounting as an information system, which is designed to make operational and strategic management decisions, needs to expand its functionality and increase its tasks. These categories have become one of the main ones in accounting, but also in management, as indispensable tools of managerial relations in business. Today, accounting is facing a scientific problem that needs theoretical and methodological justifications and practical solutions. It is necessary to expand the functionality of accounting in agrarian enterprises in order to meet management requests focused on achieving the strategic goal of the enterprise and maximize the value of business. The analysis of the evolution of information requests of the branch management and the priority of accounting functions in the development of agrarian business makes it possible to conclude that the priority task characterizes the process of information support for customers and consumers. According to the results of studying the classifications of functions, we have concluded that most often the scientists indicate the information function, the second most important is the control, and then the analytical and evaluation. Considering different approaches of scientists to classification of accounting functions and summarizing the results of the research, we concluded that the existing set of accounting functions does not allow to fully fulfill the tasks set before it. Therefore, in the current conditions of development of the global economy, the solution of this problem requires both theoretical and methodological justifications. That is why an important component of increasing the importance of accounting in the management of agrarian business is the expansion of its functionality, in particular by isolating new objectively formed functions. Given the priority of accounting functions in the development of agrarian business, they should be classified according to the information requests of the management system, as a result of which we propose to introduce a cost-oriented function and the function of saving capital and economic security of business. The capital saving function is a tool through which the formation of equity, regulation of property relations and business management, which provides a legal platform for completeness of payments with owners and guarantees the economic security of the enterprise. This function will facilitate the management of capital formation and its use. The value-oriented function is based on creating the market value of the business or providing the assets with the characteristics of the most valuable investments. It reflects the change in the value of the property of the enterprise from the point of view of transformation of its value in the external environment and allows to better understand the alternative advantages of investment sources. The proposed functions are aimed at identifying the degree of participation of owners in the management of the business entity, completeness of payments with them and determining the market value of agricultural businesses, increasing the investment attractiveness of Ukrainian agricultural enterprises. Discussion. Further scientific research in the direction of increasing the functionality of accounting in the management of agricultural business, it is advisable to carry out on the basis of domestic and foreign experience where the basis is the assertion that is built on the basis that accounting becomes the main function of management, which will facilitate the implementation of all functions of the management system. This will allow you to determine the place of accounting functions in achieving the goal of the management system, which will help in the formation of feedbacks between management and accounting. In-depth study of accounting functions will create the basis for improving the theoretical and methodological level of its development and will enhance functionality in the management system of agricultural business. Functional approach will allow to study the object of accounting not from the point of view of internal structure, set of interrelations of elements of its system, but on the other hand - interrelations with the external environment.


2019 ◽  
Vol 17 (1) ◽  
pp. 370-379
Author(s):  
Oksana Korolovych ◽  
Olha Chabaniuk ◽  
Natalia Ostapiuk ◽  
Yurii Kotviakovskyi ◽  
Nelia Gut

The conditions for doing business at this stage are often similar in a game in which you need to calculate your actions a few steps ahead. At the same time, it is important to highlight several possible current options and make the necessary decision at the control moment. Moreover, each of the options formed should be justified, understandable and take into account the risk factors and available resources.Today, the main problem of assessing and minimizing the risk of “unfriendly takeover” is due to the fact that in most cases the raider is a player who acts quite legitimately and relies on the loopholes of the current legislative framework. Therefore, it is easier to identify possible actions of the raider and to avoid them within the limits of the reverse game than to deal with the consequences.The purpose of the research is to study the specificity of the individualized assessment and minimization of the risk of “unfriendly takeover” by using elements of game theory.It has been taken into account that the effect of individualization in assessing the risk of unfriendly takeover of enterprises can possibly be achieved on the basis of the application of game theory, the elements of which provide simulation of the unfriendly takeover process within the mathematical description of the inherent combinations of attack/defence as if they actually occurred in time both within one state of the external environment and for their given set.The results allowed forming mathematical decision-making models based on the elements of the antagonistic game “raider-target enterprise” and “raider games with the external environment”, which proved the possibility to: 1) identify possible functions of wins/losses; 2) combinations of attacks that can be neglected (that is, from the point of view of the rationality of decisions, will be rejected by the raider); 3) the ranking of the raider’s “attack combinations” for the reliability of their use during “unfriendly takeover”. Under such conditions, the target company can provide not only a detailed assessment, but also an effective minimization of the risk of “unfriendly takeover” and allocate the best combination of protection.


2020 ◽  
Vol 144 ◽  
pp. 126-135
Author(s):  
Anna A. Voloshinskaya ◽  

There is no generally accepted definition of a territory’s mission either in Russia or abroad. So is it worth including a mission in the strategy of socio-economic development of a territory and what definition of the mission is better to choose? To answer these questions, a content analysis of Russian and foreign definitions of the territory's mission has been carried out, from which common units of meaning were identified. It was established that a number of semantic units in definitions of the territory's mission and the mission of organization coincide. However, from the point of view of the mission statement, there are a number of significant differences between a territory and an organization, which makes some definitions of the territory’s mission hardly applicable in practice. Conclusion is made: it is better to define the territory's mission through its role in the external environment, functions and unique features of the territory. The article examines advantages and disadvantages of alternative options: not to develop a mission at all or to develop it in a purely formal way. Practical recommendations on developing a territory mission, examples from Russian and foreign experience are given.


Author(s):  
A.V. Novikov ◽  
K.V. Panevnikov ◽  
I.V. Pisarev

To ensure industrial and mining safety the established safety rules for coal mines envisage the use of a number of complexes and systems, combined into multifunctional safety systems. These automated systems provide for people to be involved in the management of technological processes. The purpose of this paper is to assess how the coal mine safety requirements are aligned with other regulatory documents as they apply to modern safety systems in coal mines. To achieve this goal, the personnel location (positioning) and emergency alert systems in coal mine workings are analyzed for compliance with the requirements of the national standard for multifunctional safety systems in coal mines. It is shown that the current requirements for positioning systems are met by systems that have high accuracy in determining the location coordinates of people. It is suggested that positioning systems of the zonal type should be either upgraded to increase the number of readout devices to bring them up to the requirements of safety regulations in coal mines or replaced.


Author(s):  
V.A. Malyshev ◽  
A.S. Leontyev ◽  
S.P. Poluektov ◽  
Е.М. Volotov

Low-altitude flight of an aircraft is an effective, but at the same time, a very complex tactical technique, during which the crew does not always have the opportunity to timely recognize the occurrence of an abnormal case, determine the way out of it and counteract an aviation accident development. Despite many advantages of the automatic mode of low-altitude flight performing, its practical implementation is associated with a number of features and disadvantages, which determined the preference for the manual mode of low-altitude flight control. These are the presence of telltale factors, limited ability of performing flights at night and in difficult weather conditions, insufficient reliability etc. The considered features determined the relevance of the of low-altitude flight safety ensuring problem in relation to the manual control mode. As a result of an experimental study of the low-altitude flight performing process in a manual control mode, it was found that when performing manually-controlled low-altitude flight, a hazard assessment of the flight situation becomes pivotal. However the crew being under such conditions is not always able to correctly assess the flight situation hazard due to a combination of objective reasons. The current state of the adaptive and on-board flight safety systems theory makes it possible to increase the safety of the manuallycontrolled low-altitude flight by using adaptive control algorithms based on the flight situation hazard assessment. To solve this problem an adaptive control algorithm is proposed that ensures the formation of a security corridor in the longitudinal control channel, where the upper limit is determined by the critical value of the aircraft detection hazard, and the lower limit is determined by the critical value of the error in maintaining a given flight altitude. For a continuous assessment of the flight situation hazard and the timely formation of control signals the complex information about the current true flight altitude and the foreground is needed. Taking into account the peculiarities of low-altitude flight a digital terrain map containing data on natural and artificial obstacles along the flight route is a more rational source of information, that will make it possible to predict the development of the flight situation hazard. The above reasoning makes it possible to form an aircraft low-altitude flight adaptive control algorithm. A distinctive feature of the proposed algorithm is the implementation of a combined control variety where the pilot is provided with ample manual control opportunities within the security corridor, and the automatic flight control system is assigned the role of a safety subsystem that ensures control and timely return of the flight situation to normal flight conditions. The presented algorithm will allow to increase the crew logical-analytical activity information support during continuous analysis of the existing flight situation due to the formation of protective control actions based on the current flight situation hazard analysis.


Author(s):  
Dingding Lu ◽  
Robyn R. Lutz ◽  
Carl K. Chang

This chapter introduces an analysis process that combines the different perspectives of system decomposition with hazard analysis methods to identify the safety-related use cases and scenarios. It argues that the derived safety-related use cases and scenarios, which are the detailed instantiations of system safety requirements, serve as input to future software architectural evaluation. Furthermore, by modeling the derived safety-related use cases and scenarios into UML (Unified Modeling Language) diagrams, the authors hope that visualization of system safety requirements will not only help to enrich the knowledge of system behaviors but also provide a reusable asset to support system development and evolution.


2020 ◽  
Vol 10 (21) ◽  
pp. 7400
Author(s):  
Lei Chen ◽  
Jian Jiao ◽  
Tingdi Zhao

ISO26262: 2018 is an international functional safety standard for electrical and/or electronic (E/E) systems within road vehicles. It provides appropriate safety requirements for road vehicles to avoid unreasonable residual risk according to automotive safety integrity levels (ASILs) derived from hazard analysis and risk assessment (HARA) required in the ISO26262 concept phase. Systems theoretic process analysis (STPA) seems to be designed specifically to deal with hazard analysis of modern complex systems, but it does not include risk evaluation required by most safety related international standards. So we integrated STPA into Failure Mode and Effect Analysis (FMEA) template to form a new method called system theoretic process analysis based on an FMEA template, STPAFT for shot, which could not only meet all the requirements of the concept phase in ISO26262, but also make full use of the advantages of the two methods. Through the focus of FMEA on low-level components, STPAFT can obtain more detailed causal factors (CFs), which is very helpful for derivation of safety goals (SGs) and the functional safety requirements (FSRs) in the concept phase of ISO26262. The application of STPAFT is described by the case study of fuel level estimation and display system (FLEDS) to show how the concept phase of ISO26262 could be supported by STPAFT.


2013 ◽  
Vol 380-384 ◽  
pp. 191-194
Author(s):  
Qin Yu Yang ◽  
Jin Bo Yao ◽  
Yue Ming Yang ◽  
Xue Wei Liu

Aircraft in flight, such as supercooled water droplets encountered icing conditions suitable for the external environment, the relevant parts of the body will freeze, making the aircraft's aerodynamic performance deterioration, severe endanger flight safety, in addition, the aircraft parked in the open winter months , there will be icing, you need to clean up before takeoff. We should grasp the mechanism of aircraft icing, environmental factors and easy to freeze parts of the body. This paper presents a simulation using the wind tunnel icing device icing wind tunnel simulations can reproduce the real situation of aircraft icing, for guiding practice and got good results.


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