Aviation最新文献_第10页

GRADIENT-BASED OPTIMIZATION OF SPACECRAFT AND AIRCRAFT THERMAL DESIGN 基于梯度的航天器和飞行器热设计优化

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Aviation Pub Date : 2020-09-11 DOI: 10.3846/aviation.2020.13045

Laurynas Mačiulis, R. Belevičius

{"title":"GRADIENT-BASED OPTIMIZATION OF SPACECRAFT AND AIRCRAFT THERMAL DESIGN","authors":"Laurynas Mačiulis, R. Belevičius","doi":"10.3846/aviation.2020.13045","DOIUrl":"https://doi.org/10.3846/aviation.2020.13045","url":null,"abstract":"Steady-case thermal analysis plays an important role in dimensioning thermal control systems for spacecrafts and aircrafts. Usually a trial and error approach is used based on engineering judgement and experience. When thermal models become complex or there are conflicting thermal requirements, however, it becomes harder for an engineer to gain insight as to which design decisions will lead to better results. Numerical optimization, on the other hand, could provide a more robust approach for the thermal design of complex spacecraft or aircraft models. In this paper, we suggest a gradientbased multidisciplinary optimization of thermal models where the coupled derivatives of the multidisciplinary system are obtained with the adjoint method. We show that in the case of steady-state thermal analysis, there is an analytic solution of a partial derivatives of implicit heat-transfer equation that can be used to derive total derivatives of the system. We present a practical application of this method by solving a small interplanetary spacecraft thermal optimization problem consisting of one objective, 15 design variables, and 10 constraints. We found that by using gradient-based optimization with exact derivatives, the best results can be achieved by exploring the design space at multiple initial starting points without major computational overhead.","PeriodicalId":51910,"journal":{"name":"Aviation","volume":"24 1","pages":"105-116"},"PeriodicalIF":1.0,"publicationDate":"2020-09-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47678654","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

ASPECTS OF COMPLEXITY OF METAL-FIBROUS MICROSTRUCTURE FOR THE CONSTRUCTION OF HIGH-PERFORMANCE HEAT EXCHANGERS: THERMAL PROPERTIES 高性能热交换器结构中金属纤维微观结构的复杂性:热性能

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Aviation Pub Date : 2020-09-10 DOI: 10.3846/aviation.2020.12086

Ł. Orman

引用次数: 4

AIRPORT TYPOLOGY FOR LCC POLICY CHANGES: A EUROPEAN PERSPECTIVE 低成本航空公司政策变化的机场类型:欧洲视角

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Aviation Pub Date : 2020-08-27 DOI: 10.3846/aviation.2020.12051

A. Kazda, M. Turiak, K. Gotz

{"title":"AIRPORT TYPOLOGY FOR LCC POLICY CHANGES: A EUROPEAN PERSPECTIVE","authors":"A. Kazda, M. Turiak, K. Gotz","doi":"10.3846/aviation.2020.12051","DOIUrl":"https://doi.org/10.3846/aviation.2020.12051","url":null,"abstract":"This paper proposes a new airport typology that might arise from the expansion of airports with dominant low cost carrier traffic. In the first part of the paper, the typologies and different airport categorizations are reviewed with examples of current taxonomies used by principal international organizations. However, none of the current airport taxonomies takes into account low cost (LCC) carriers and cannot be used to create an airport market strategy with LCC operation. The paper highlights the characteristic of LCC features, the differences between the LCC airlines, and the characteristics of secondary – low cost airports. Finally, the paper proposes a new taxonomy of airports with low cost operations based on the airport data analysis and expert panel elucidation. For identification of airports with a high share of low cost carriers, Eurocontrol 2013 data on airline types and movements were used. The novel classification of low cost airports enables management to design marketing strategies to respond to LCC dominance and its implications. The main contribution of this research is to provide a novel classification for low cost airports which is relatively new phenomenon comparing with the problems of full service carriers dominance at large airports.","PeriodicalId":51910,"journal":{"name":"Aviation","volume":"24 1","pages":"90-98"},"PeriodicalIF":1.0,"publicationDate":"2020-08-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47416350","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: 5

EFFECT OF AN IN-FLIGHT VERTICAL ACCELEROMETER CALIBRATION ON LANDING ACCURACY AFTER BARO-INERTIAL SYSTEM FAILURE 飞行中垂直加速度计标定对气压惯性系统故障后着陆精度的影响

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Aviation Pub Date : 2020-07-08 DOI: 10.3846/aviation.2020.12424

Man Nguyen, V. Kostiukov, C. Tran

引用次数: 2

SPECIAL EDITION OF "AVIATION" 《航空》特刊

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Aviation Pub Date : 2020-07-08 DOI: 10.3846/aviation.2020.13110

G. Bureika

引用次数: 0

EFFECTIVENESS ANALYSIS OF UCAV USED IN MODERN MILITARY CONFLICTS UCAV在现代军事冲突中的效能分析

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Aviation Pub Date : 2020-07-08 DOI: 10.3846/aviation.2020.12144

M. Adamski

引用次数: 5

ALGORITHM FOR ANALYZING DEVIATIONS AND IRREGULARITIES IN THE FUNCTIONING OF THE AIRLINE'S STRUCTURAL UNITS AND PERSONNEL IN THE FACE OF UNCERTAINTY 在面对不确定性时，分析航空公司结构单位和人员运作中的偏差和不规则现象的算法

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Aviation Pub Date : 2020-07-08 DOI: 10.3846/aviation.2020.12375

Jevgēnijs Tereščenko, Аleksandrs Bitins, V. Shestakov, R. Chatys, Juris Maklakov

{"title":"ALGORITHM FOR ANALYZING DEVIATIONS AND IRREGULARITIES IN THE FUNCTIONING OF THE AIRLINE'S STRUCTURAL UNITS AND PERSONNEL IN THE FACE OF UNCERTAINTY","authors":"Jevgēnijs Tereščenko, Аleksandrs Bitins, V. Shestakov, R. Chatys, Juris Maklakov","doi":"10.3846/aviation.2020.12375","DOIUrl":"https://doi.org/10.3846/aviation.2020.12375","url":null,"abstract":"At the heart of airline flight safety management is a systematic approach to identifying hazards and controlling risk factors, which ICAO requires to collect, analyze all deviations in the activities of units, services and personnel airlines and use of its results to develop and implement management activities. That kind of the system enables the organization to predict and fix problems before they lead to an aviation accident. Thus, the organizational management structure should ensure high efficiency, reliability and completeness of the control over all components that ensure the process of the air transportation: the course of transportation, the clear operation of all units in the uninterrupted transport process and their correct matching. In modern conditions, this result is achieved based on a process approach, when the company’s activities are presented as a set of production processes (activities). For each of these areas, the airline has appropriate management systems that are developed, certified, implemented and operated in accordance with international standards. As a result of the interaction of these processes, the goals of the aviation enterprise, which determine its competitiveness, are achieved.","PeriodicalId":51910,"journal":{"name":"Aviation","volume":"24 1","pages":"51-56"},"PeriodicalIF":1.0,"publicationDate":"2020-07-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44032324","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: 3

TRIPLE PROBABILITY DENSITY DISTRIBUTION MODEL IN THE TASK OF AVIATION RISK ASSESSMENT 航空风险评估任务中的三概率密度分布模型

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Aviation Pub Date : 2020-07-08 DOI: 10.3846/aviation.2020.12544

I. Ostroumov, Karen B. Marais, N. Kuzmenko, Nicoletta Fala

{"title":"TRIPLE PROBABILITY DENSITY DISTRIBUTION MODEL IN THE TASK OF AVIATION RISK ASSESSMENT","authors":"I. Ostroumov, Karen B. Marais, N. Kuzmenko, Nicoletta Fala","doi":"10.3846/aviation.2020.12544","DOIUrl":"https://doi.org/10.3846/aviation.2020.12544","url":null,"abstract":"The probability of an airplane deviation from pre-planned trajectory is a core of aviation safety analysis. We propose to use a mixture of three probability density distribution functions it the task of aviation risk assessment. Proposed model takes into account the effect of navigation system error, flight technical error, and occurrence of rare events. Univariate Generalized Error Distribution is used as a basic component of distribution functions, that configures the error distribution model from the normal error distribution to double exponential distribution function. Statistical fitting of training sample by proposed Triple Univariate Generalized Error Distribution (TUGED) is supported by Maximum Likelihood Method. Optimal set of parameters is estimated by sequential approximation method with defined level of accuracy. The developed density model has been used in risk assessment of airplane lateral deviation from runway centreline during take-off and landing phases of flight. The efficiency of the developed model is approved by Chi-square, Akaike’s, and Bayes information criteria. The results of TUGED fitting indicate better performance in comparison with double probability density distribution model. The risk of airplane veering off the runway is considered as the probability of a rare event occurrence and is estimated as an area under the TUGED.","PeriodicalId":51910,"journal":{"name":"Aviation","volume":"24 1","pages":"57-65"},"PeriodicalIF":1.0,"publicationDate":"2020-07-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42649842","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: 23

ESTIMATION OF EVACUATION TIME OF PASSENGERS IN AIRCRAFT ACCIDENTS WITH FIRE IN AIRFIELD AREAS 机场着火飞机事故中乘客疏散时间的估计

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Aviation Pub Date : 2020-07-08 DOI: 10.3846/aviation.2020.12653

A. Suharev, V. Shestakov, L. Vinogradov

引用次数: 4

RPAS COMMUNICATION CHANNELS BASED ON WCDMA 3GPP STANDARD Rpas通信信道基于wcdma 3gpp标准

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Aviation Pub Date : 2020-05-11 DOI: 10.3846/aviation.2020.12166

A. Grekhov, V. Kondratiuk, S. Ilnytska

引用次数: 9