The Aeronautical Journal (1968)最新文献_第10页

Stability criteria of Samara-like decelerator in unsteady transitions 非定常过渡下萨马拉型减速器的稳定性判据

The Aeronautical Journal (1968) Pub Date : 2022-12-02 DOI: 10.1017/aer.2022.95

H.-C. Wang, R. Breidenthal

引用次数: 0

Estimation of safe flight envelope considering manoeuver overload based on cost-limited reachable set 基于成本限制可达集的机动过载安全飞行包线估计

The Aeronautical Journal (1968) Pub Date : 2022-12-01 DOI: 10.1017/aer.2022.96

Feng Zhou, H. Nie

引用次数: 1

A fuzzy model to predict the mechanical characteristics of friction stir welded joints of aluminum alloy AA2014-T6 采用模糊模型预测AA2014-T6铝合金搅拌摩擦焊接接头力学特性

The Aeronautical Journal (1968) Pub Date : 2022-12-01 DOI: 10.1017/aer.2022.90

A. S. Kannusamy, S. Ponni alias sathya

{"title":"A fuzzy model to predict the mechanical characteristics of friction stir welded joints of aluminum alloy AA2014-T6","authors":"A. S. Kannusamy, S. Ponni alias sathya","doi":"10.1017/aer.2022.90","DOIUrl":"https://doi.org/10.1017/aer.2022.90","url":null,"abstract":"\u0000 Friction stir welding is a prominent technique for making defect-free joints of aluminum alloys. The aluminum alloy AA2014-T6 finds wide applications in aerospace, naval and automotive applications. This paper attempts to predict the tensile strength and hardness characteristics of friction stir welded aluminum alloy AA2014-T6 by a fuzzy logic model. Friction stir welding was carried out by varying tool rotational speed (700, 1,000 and 1,400rpm), welding speed (20, 35, 50mm/min) and axial force (10, 12, 14kN) at three levels. The tensile strength and hardness characteristics of the welded specimens were obtained from the experiments conducted as per Taguchi’s L27 orthogonal array. A Mamdani-type fuzzy logic model was developed to predict the tensile strength and nugget hardness characteristics of the FSW joints. The fuzzy model was evaluated by comparing the results of confirmation experiments with that of the results predicted by the model. The confirmation experiments were conducted with a new set of parameters other than the ones used for building the model. The fuzzy model exhibits marginal variations of 2.53% for tensile strength and 2.42% for weld nugget hardness compared to the results of the conformation experiments.","PeriodicalId":22567,"journal":{"name":"The Aeronautical Journal (1968)","volume":"34 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75305925","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

Optimisation design of turbofan engine using infrared stealth technology 采用红外隐身技术的涡扇发动机优化设计

The Aeronautical Journal (1968) Pub Date : 2022-11-28 DOI: 10.1017/aer.2022.88

M. Chen, H. Chen, H. Zhang, J. Luo

引用次数: 0

Historical development of the coaxial contra-rotating propeller 同轴对转螺旋桨的历史发展

The Aeronautical Journal (1968) Pub Date : 2022-11-25 DOI: 10.1017/aer.2022.92

A. Filippone

{"title":"Historical development of the coaxial contra-rotating propeller","authors":"A. Filippone","doi":"10.1017/aer.2022.92","DOIUrl":"https://doi.org/10.1017/aer.2022.92","url":null,"abstract":"\u0000 We review the development of the contra-rotating propellers from the origins to the present. Initially, these systems were proposed to increase speed, then to increase propulsive efficiency, and thus reduce fuel burn. Ultimately, they hit another environmental limit: too much noise. Acoustics has been in fact the main focus of the development in the past 30 years. Pioneering work done across countries demonstrated several unique features of this propulsor. Various embodiments are available, namely contra-rotating, counter-rotating, co-axial, tandem, open rotor and prop-fans, collectively named contra-rotating propellers. This review only considers concepts that have been applied to real aircraft, prototypes that are known to have been flight tested (about 70 vehicles), or representative laboratory models. Five classifications are proposed: pioneers (before 1940), golden years (1940–1950), Western airplanes (1950s onwards), Soviet-Russian airplanes (1950s onwards) and modern developments (1980s onwards). Selected experimental aircraft and laboratory concepts are mentioned, where these appear to advance the state-of-the-art. Power plants evolved from internal combustion engines to the modern gas turbine engines requiring new solutions. Engine layouts and propulsion configurations are analysed where appropriate. It is concluded that propulsive efficiency can only be achieved at a cost of multiple engineering problems, some of which remain unsolved.","PeriodicalId":22567,"journal":{"name":"The Aeronautical Journal (1968)","volume":"59 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-11-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83421013","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

Prescribed-time cooperative guidance with time delay 有时间延迟的定时合作指导

The Aeronautical Journal (1968) Pub Date : 2022-11-23 DOI: 10.1017/aer.2022.87

W. Ma, W. Fu, Y. Fang, S. Liu, X. Liang

引用次数: 2

Impact on Vectran/Epoxy composites: Experimental and numerical analysis 对Vectran/环氧复合材料的影响:实验和数值分析

The Aeronautical Journal (1968) Pub Date : 2022-11-21 DOI: 10.1017/aer.2022.93

S. Syed Abdullah, L. Iannucci, E. Greenhalgh, F. Yusof

引用次数: 0

Aircraft sequencing under the uncertainty of the runway occupancy times of arrivals during the backtrack procedure 返航过程中到达跑道占用时间不确定下的飞机排序

The Aeronautical Journal (1968) Pub Date : 2022-11-21 DOI: 10.1017/aer.2022.91

K. Dönmez

{"title":"Aircraft sequencing under the uncertainty of the runway occupancy times of arrivals during the backtrack procedure","authors":"K. Dönmez","doi":"10.1017/aer.2022.91","DOIUrl":"https://doi.org/10.1017/aer.2022.91","url":null,"abstract":"\u0000 In some small airports, a parallel taxiway is not built due to space restrictions or financial issues; hence, the runway itself is often used as a taxiway in this type of airport. After touch down, aircraft move to the U-turn area at the end of the runway and turn 180 degrees, then move back to the desired point, such as a gate or the apron, using the runway. The runway is blocked to other arrivals and departures during this process. This process, called backtrack or back-taxi, can result in high delays for both arrivals and departures. Runway occupancy times (ROTs) vary depending on numerous conditions, including pilot performance, weather conditions, aircraft type, etc. Although there are speed restrictions and procedures announced in advance, the actual performance can be uncertain. In addition, most aircraft can make a U-turn as soon as they sufficiently reduce their speed before they reach the U-turn area especially if they are already delayed. These situations bring enormous uncertainties for traffic management at such an airport. Controllers may need help to sequence aircraft, particularly in busy traffic. In this study, a stochastic mathematical model is developed to sequence arrival/departure operations at such an airport considering the ROT uncertainties of arrivals. The objective function of the developed model is determined as the minimisation of the total delay. ROT data was obtained by observing radar tracks of 120 arriving flights. Reasonable ROT scenarios with various probabilities to represent ROT uncertainties were integrated into the mathematical modeling. In addition, two different sequencing approaches are presented as well as the first come first serve (FCFS) approach. As a result, the proposed stochastic approach provides robust sequences applicable for all ROT scenarios with significant delay savings up to an average of 18.4% and 39.5% compared to deterministic and FCFS approaches, respectively.","PeriodicalId":22567,"journal":{"name":"The Aeronautical Journal (1968)","volume":"20 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-11-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73873695","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

Effective aero-optical suppression by steady wall blowing and wall suction schemes for supersonic turbulent boundary layer 超声速湍流边界层的稳定壁面吹风和壁面吸力气动光学抑制

The Aeronautical Journal (1968) Pub Date : 2022-11-21 DOI: 10.1017/aer.2022.84

H. Zou, X. Yang, X.-W. Sun, W. Liu, Q. Yang

引用次数: 1

An investigation of aerodynamic behaviours and aerodynamic performance of a model wing formed from different profiles 不同型面组成的模型机翼气动特性和气动性能的研究

The Aeronautical Journal (1968) Pub Date : 2022-11-16 DOI: 10.1017/aer.2022.85

A. Askan, S. Tangöz, M. Konar

{"title":"An investigation of aerodynamic behaviours and aerodynamic performance of a model wing formed from different profiles","authors":"A. Askan, S. Tangöz, M. Konar","doi":"10.1017/aer.2022.85","DOIUrl":"https://doi.org/10.1017/aer.2022.85","url":null,"abstract":"\u0000 In this study, the aerodynamic performances and the flow separation behaviour of the wing profiles, used in the wing of Boeing 737-Classic aircraft, and a model wing formed of these profiles were investigated at 2 × 105 Reynolds number (Re) and different angles of attack ranging from −4° to the angle, which maximum lift point obtained. The experiments were conducted in a low-speed wind tunnel in Erciyes University Faculty of Aeronautics and Astronautics Aerodynamic Laboratory. Four profiles and the model wing, which was obtained from the combination of the four profiles were produced in a rectangular shape with dimensions of 0.21m × 0.21m. In the first part of this two-part study, the wing profiles were examined individually regarding aerodynamic performance and flow separation. In the second phase of the study, the aerodynamic performance and the flow separation behaviour of the model wing were examined and the results were compared with the data obtained from each profile. The study results showed that the slopes of the numerical graphics are generally quite consistent with experimental results. In addition, the pressure and velocity distributions have followed the normal trend until the angle-of-attack (AoA) of 20°. In contrast, the negative speed values and negative pressure zones have appeared on the profile above this angle. The air flowed as laminar on the profiles and the model wing until 20°, while laminar separation bubbles are begun to take place at about 24° AoA. Finally, the best aerodynamic performance has been obtained with the model wing.","PeriodicalId":22567,"journal":{"name":"The Aeronautical Journal (1968)","volume":"52 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-11-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90753448","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