Aviation最新文献_第3页

A SIMULTANEOUS PATH PLANNING AND POSITIONING BASED ON ARTIFICIAL DISTRIBUTION OF LANDMARKS IN A GNSS DENIED ENVIRONMENT GNSS拒绝环境下基于地标人工分布的同时路径规划与定位

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Aviation Pub Date : 2023-03-07 DOI: 10.3846/aviation.2023.18461

S. Elahian, M. A. Amiri Atashgah, Bahram Tarverdizadeh

{"title":"A SIMULTANEOUS PATH PLANNING AND POSITIONING BASED ON ARTIFICIAL DISTRIBUTION OF LANDMARKS IN A GNSS DENIED ENVIRONMENT","authors":"S. Elahian, M. A. Amiri Atashgah, Bahram Tarverdizadeh","doi":"10.3846/aviation.2023.18461","DOIUrl":"https://doi.org/10.3846/aviation.2023.18461","url":null,"abstract":"In recent years, exploration operations by autonomous robots are expanding into unknown environments on Earth, under the sea, or even on other planets. This paper proposes the idea of Concurrent Path Planning and Positioning (CPPAP) using artificially distributed landmarks, while no GNSS signal is available. The method encompasses an observability-based direction search algorithm for path planning in parallel with Simultaneous Localization and Mapping (SLAM) for localization. Most of the path planning methods utilize offline algorithms; however, the proposed method determines the robot’s direction of motion in real-time, concurrently with the positioning tasks by the inclusion of the system observability, related to the features’ distribution. Same as in all feature-based SLAMs, features play an important role in determination of the most observable direction, and hence the direction of the robot’s motion. Moreover, the effectiveness of the distribution of the features and their pattern in the proposed method is investigated. To evaluate the efficiency and accuracy of the CPPAP, outcomes are compared with an existing random SLAM.","PeriodicalId":51910,"journal":{"name":"Aviation","volume":" ","pages":""},"PeriodicalIF":1.0,"publicationDate":"2023-03-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45273578","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

METHOD OF EVALUATION OF MILITARY HELICOPTER PILOT SELECTION CRITERIA: A NOVEL GREY SWARA APPROACH 军用直升机飞行员选拔标准的评估方法:一种新的灰色swara方法

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Aviation Pub Date : 2023-02-28 DOI: 10.3846/aviation.2023.18596

Salim Kurnaz, Aşkın Özdağoğlu, M. Keleş

{"title":"METHOD OF EVALUATION OF MILITARY HELICOPTER PILOT SELECTION CRITERIA: A NOVEL GREY SWARA APPROACH","authors":"Salim Kurnaz, Aşkın Özdağoğlu, M. Keleş","doi":"10.3846/aviation.2023.18596","DOIUrl":"https://doi.org/10.3846/aviation.2023.18596","url":null,"abstract":"Helicopter is a very important defence and attack tool for a country’s armed forces (army) (air force). With the rapid progress of technology, the designs of helicopters, the hardware and software elements in the helicopter have also been renewed and developed in parallel with advanced technology. Therefore, it is expected that the pilots who will use helicopters, which are an important flight tool of armed forces, will also have the qualifications to provide the necessary knowledge, skills, and criteria. The aim of the study is to determine the military helicopter pilot selection criteria and to find the importance levels of these criteria. For this purpose, three main criteria as “Health”, “Psychomotor” and “Education and Training” and thirteen sub-criteria were determined. The weights of the determined criteria were found by the Grey SWARA method, which is a current multi criteria decision making tool. According to the results of the analysis, it is found that the most important sub-criteria was “Practical Training”, while the lowest important criteria was the “Height and weight limits” criterion. With this study, the weights of the military helicopter pilot selection criteria were found for the first time with the Grey SWARA method.","PeriodicalId":51910,"journal":{"name":"Aviation","volume":" ","pages":""},"PeriodicalIF":1.0,"publicationDate":"2023-02-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42848464","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

A LAMINAR FLOW, PROPULSIVE, JET-FLAPPED CONCEPT FOR ELECTRICALLY POWERED TRANSPORT AIRCRAFT 一种用于电动运输机的层流、推进、喷气重叠概念

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Aviation Pub Date : 2023-02-23 DOI: 10.3846/aviation.2023.18498

N. Kehayas

{"title":"A LAMINAR FLOW, PROPULSIVE, JET-FLAPPED CONCEPT FOR ELECTRICALLY POWERED TRANSPORT AIRCRAFT","authors":"N. Kehayas","doi":"10.3846/aviation.2023.18498","DOIUrl":"https://doi.org/10.3846/aviation.2023.18498","url":null,"abstract":"Friction drag constitutes approximately half of the total drag of subsonic civil transport aircraft at cruise conditions. Several means were examined to control the flow over an aircraft and achieve laminar flow. Here, a new concept for friction drag reduction in the form of an integration of the aerodynamics and propulsion of the aircraft is put forward. Engines buried in the wing and at the rear of the fuselage suck the boundary layer of the entire wing and fuselage surface, and then, they used it as intake air and exhaust through ducts. At the wings, the engines exhaust in the form of a jet flap at the trailing edge providing distributed propulsion. By this laminar flow, propulsive concept laminar flow is established over the entire aircraft, resulting in substantial drag reduction. The analysis showed that out of the four electrically powered aircraft versions considered only the combined lift distribution with tailless fuselage is about to be feasible. It was also found that the example aircraft design is inappropriate. It is expected that a design purposely based on the proposed concept would bring electrically powered transport aircraft within the specific energy levels of present batteries.","PeriodicalId":51910,"journal":{"name":"Aviation","volume":"1 1","pages":""},"PeriodicalIF":1.0,"publicationDate":"2023-02-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42606280","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

EXPERIMENTAL STUDY OF PHYSICAL-CHEMICAL PROPERTIES OF ADVANCED ALCOHOL-TO-JET FUELS 先进醇制喷气燃料理化性质的实验研究

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Aviation Pub Date : 2023-02-23 DOI: 10.3846/aviation.2023.18564

A. Yakovlieva, S. Boichenko, Vasyl Boshkov, L. Korba, M. Hocko

{"title":"EXPERIMENTAL STUDY OF PHYSICAL-CHEMICAL PROPERTIES OF ADVANCED ALCOHOL-TO-JET FUELS","authors":"A. Yakovlieva, S. Boichenko, Vasyl Boshkov, L. Korba, M. Hocko","doi":"10.3846/aviation.2023.18564","DOIUrl":"https://doi.org/10.3846/aviation.2023.18564","url":null,"abstract":"The paper presents an analytical review of technological processes of alternative jet fuel production from alcohols and experimental results on the study of its physical-chemical properties. State-of-the-art in the sphere of civil aviation development within the framework of sustainable development and minimization of transport’s negative impact on the environment is presented. The development and implementation of sustainable aviation fuels are considered the main measure for reaching carbon-neutral growth. Two technologies of alcohol-to-jet fuel production are considered, and possible feedstock and processing pathways are presented. Physical-chemical properties of two kinds of alcohol-to-jet fuels are studied experimentally, as well as the properties of conventional jet fuels blended with alternative ones. It is shown that the physical-chemical properties of jet fuels blended with alcohol-to-jet component containing aromatics are very close to conventional jet fuels. All of the studied fuel blends with alcohol-to-jet components completely satisfy the requirements of specifications. Basing on the received results it is expected that alcohol-to-jet component containing aromatics may be successfully used for blending with conventional jet fuel and used as a drop-in fuel.","PeriodicalId":51910,"journal":{"name":"Aviation","volume":" ","pages":""},"PeriodicalIF":1.0,"publicationDate":"2023-02-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43019574","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

EVALUATION OF WING STRUCTURES AT THE CONCEPTUAL STAGE OF TRANSPORT CATEGORY AIRCRAFT PROJECTS 运输机项目概念阶段机翼结构的评估

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Aviation Pub Date : 2022-12-09 DOI: 10.3846/aviation.2022.18041

A. Kretov, D. Tiniakov

{"title":"EVALUATION OF WING STRUCTURES AT THE CONCEPTUAL STAGE OF TRANSPORT CATEGORY AIRCRAFT PROJECTS","authors":"A. Kretov, D. Tiniakov","doi":"10.3846/aviation.2022.18041","DOIUrl":"https://doi.org/10.3846/aviation.2022.18041","url":null,"abstract":"The purpose of this research is to improve the approach for evaluating of new design solutions based on sensitivity analysis of takeoff mass (SFM) to initial changes in the basic project. The approach is based on the changes assessment in maximum takeoff mass of a developed project or an already existed basic variant of an aircraft with local design (project) changes, including the aerodynamic ones, that ensure the developing of a more advanced aircraft. In comparison with the existed known approaches based on the mass growth factors, which were considered constant, the proposed approach takes into account more exactly the dependence of the takeoff mass on the initial local change in mass in terms of their functional purpose, as well as the aerodynamic characteristics. This approach allows the designer to calculate more precisely the final maximum takeoff mass changes in the early (preliminary) stages of conceptual design when looking for new design solutions. On numerical examples, carried out on the examples of transport category airplanes, a significant dependence of the wing aspect ratio influence on fuel efficiency is shown. The considered approach using SFM with semi-analytical aerodynamic analysis combination is simple, reliable and convenient in the analysis and synthesis of a new project for the design process based on the base variant.","PeriodicalId":51910,"journal":{"name":"Aviation","volume":" ","pages":""},"PeriodicalIF":1.0,"publicationDate":"2022-12-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46340836","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

THE EFFECT OF MOTION FORMATION ON COOPERATIVE NAVIGATION 运动编队对协同导航的影响

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Aviation Pub Date : 2022-12-08 DOI: 10.3846/aviation.2022.17552

Mohammad Saberi Tavakkoli, G. Kahe, F. Sadeghikia

引用次数: 0

MODELLING A QUANTITATIVE ASSESSMENT METHOD OF PILOTS’ PERFORMANCE IN EVIDENCE-BASED TRAINING 基于实证的飞行员培训绩效定量评估方法建模

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Aviation Pub Date : 2022-11-30 DOI: 10.3846/aviation.2022.18037

Zarif Zabirov, A. Zabirov, V. Shestakov

引用次数: 0

A METHOD FOR AUTOMATIC AIRPORT OPERATION COUNTS USING CROWD-SOURCED ADS-B DATA 一种利用众包ads-b数据进行自动机场运行计数的方法

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Aviation Pub Date : 2022-11-29 DOI: 10.3846/aviation.2022.18025

Nicoletta Fala, Christos Falas, Anastasios Falas

引用次数: 0

QUANTIFICATION MODEL OF AIRPORT GROUND SUPPORT EQUIPMENT EMISSIONS 机场地勤设备排放量化模型

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Aviation Pub Date : 2022-11-29 DOI: 10.3846/aviation.2022.17967

Lucas Sznajderman, M. Coppa, Juan F. Martiarena, O. D. Olariaga

{"title":"QUANTIFICATION MODEL OF AIRPORT GROUND SUPPORT EQUIPMENT EMISSIONS","authors":"Lucas Sznajderman, M. Coppa, Juan F. Martiarena, O. D. Olariaga","doi":"10.3846/aviation.2022.17967","DOIUrl":"https://doi.org/10.3846/aviation.2022.17967","url":null,"abstract":"Emissions of aircraft support vehicles (called Ground Support Equipment or GSE) are produced by a series of factors depending mostly on the following: aircraft arrivals and departures and time spent in parking stands, aircraft type, operation type (traditional, with scale or low cost), geometrical arrangement of the apron and fleet charactistics, including power and years of use, among others. The aim of this work is to develop an integrated model identifying the required GSEs and the gaseous emissions produced by them due to apron traffic and aircraft service. In order to do this, in the case of service, the model proposes considering loading and unloading and dividing them into the following stages: wait, connection, service and disconnection. The advantage of the proposed model over other proposals is that this model aims at copying the real movements of support vehicles in service according to the aircraft and its corresponding operation (Full-Service, Low-Cost or scale). In order to do that, the program discretizes GSE movements into loading and unloading processes through different stages and for circulation where the tool itself sets the parameters of the apron.","PeriodicalId":51910,"journal":{"name":"Aviation","volume":" ","pages":""},"PeriodicalIF":1.0,"publicationDate":"2022-11-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44361040","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

THE CONNECTION BETWEEN AN AIRPORT TYPE AND REVENUE STRUCTURE AT BALTIC STATES AIRPORTS 波罗的海国家机场类型与收入结构之间的关系

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Aviation Pub Date : 2022-11-28 DOI: 10.3846/aviation.2022.17854

Kristine Uzule, I. Kuzmina-Merlino

{"title":"THE CONNECTION BETWEEN AN AIRPORT TYPE AND REVENUE STRUCTURE AT BALTIC STATES AIRPORTS","authors":"Kristine Uzule, I. Kuzmina-Merlino","doi":"10.3846/aviation.2022.17854","DOIUrl":"https://doi.org/10.3846/aviation.2022.17854","url":null,"abstract":"Airports are not only engines of transportation of passengers and cargo, but also commercial enterprises offering services far beyond transportation, which is why their revenues are formed by both aeronautical and non-aeronautical sales. Aeronautical revenues of some large European airports are higher than non-aeronautical revenues, whereas some regional and secondary European airports demonstrate the opposite trend. The aim of this research was to determine if there is a connection between an airport type and the ratio of aeronautical and non-aeronautical revenues at Baltic States airports in way that is consistent with the previous research. The aim was attained in three stages. The first, the definitions of the main and secondary airports were constructed via discourse analysis. The second, the structure of airport revenues of the selected Baltic States airports was analysed. The third, conclusions were made regarding a connection between an airport type and the revenue structure of these Baltic States airports. On the one hand, the research results suggested there might be a connection between an airport type and the revenue structure although this question requires further research, and on the other hand, the financial analysis showed that airports with a higher share of non-aeronautical revenues than aeronautical revenues were more resilient to crises.","PeriodicalId":51910,"journal":{"name":"Aviation","volume":" ","pages":""},"PeriodicalIF":1.0,"publicationDate":"2022-11-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46509864","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0