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  Subjects -> AERONAUTICS AND SPACE FLIGHT (Total: 120 journals)
Showing 1 - 30 of 30 Journals sorted alphabetically
Acta Astronautica     Hybrid Journal   (Followers: 484)
Advances in Aerospace Engineering     Open Access   (Followers: 66)
Advances in Aerospace Science and Technology     Open Access   (Followers: 7)
Advances in Astronautics Science and Technology     Hybrid Journal  
Advances in Space Research     Full-text available via subscription   (Followers: 454)
Aeronautical Journal, The     Hybrid Journal   (Followers: 10)
Aerospace     Open Access   (Followers: 57)
Aerospace Medicine and Human Performance     Full-text available via subscription   (Followers: 14)
Aerospace Science and Technology     Hybrid Journal   (Followers: 422)
Aerospace Scientific Journal     Open Access   (Followers: 15)
Aerospace Systems     Hybrid Journal   (Followers: 3)
Aerospace technic and technology     Open Access   (Followers: 2)
Aerotecnica Missili & Spazio : Journal of Aerospace Science, Technologies & Systems     Hybrid Journal  
AIAA Journal     Hybrid Journal   (Followers: 1177)
Air Force Magazine     Full-text available via subscription   (Followers: 11)
Air Medical Journal     Hybrid Journal   (Followers: 8)
Annual of Navigation     Open Access   (Followers: 22)
Artificial Satellites     Open Access   (Followers: 23)
ASTRA Proceedings     Open Access   (Followers: 2)
Astrodynamics     Hybrid Journal   (Followers: 1)
Aviation     Open Access   (Followers: 15)
Aviation Advances & Maintenance     Open Access   (Followers: 3)
Aviation in Focus - Journal of Aeronautical Sciences     Open Access   (Followers: 10)
Aviation Psychology and Applied Human Factors     Hybrid Journal   (Followers: 26)
Aviation Week     Full-text available via subscription   (Followers: 438)
Canadian Aeronautics and Space Journal     Full-text available via subscription   (Followers: 33)
CEAS Aeronautical Journal     Hybrid Journal   (Followers: 29)
Chinese Journal of Aeronautics     Open Access   (Followers: 20)
Ciencia y Poder Aéreo     Open Access   (Followers: 2)
Civil Aviation High Technologies     Open Access   (Followers: 5)
Control Systems     Hybrid Journal   (Followers: 317)
Cosmic Research     Hybrid Journal   (Followers: 4)
COSPAR Colloquia Series     Full-text available via subscription   (Followers: 11)
Egyptian Journal of Remote Sensing and Space Science     Open Access   (Followers: 24)
Elsevier Astrodynamics Series     Full-text available via subscription   (Followers: 12)
Fatigue of Aircraft Structures     Open Access   (Followers: 15)
Frontiers in Astronomy and Space Sciences     Open Access   (Followers: 12)
Gyroscopy and Navigation     Hybrid Journal   (Followers: 255)
IEEE Aerospace and Electronic Systems Magazine     Full-text available via subscription   (Followers: 276)
IEEE Journal on Miniaturization for Air and Space Systems     Hybrid Journal   (Followers: 2)
IEEE Transactions on Aerospace and Electronic Systems     Hybrid Journal   (Followers: 383)
IEEE Transactions on Circuits and Systems I: Regular Papers     Hybrid Journal   (Followers: 39)
International Journal of Aeroacoustics     Hybrid Journal   (Followers: 39)
International Journal of Aerodynamics     Hybrid Journal   (Followers: 36)
International Journal of Aeronautical and Space Sciences     Hybrid Journal   (Followers: 2)
International Journal of Aerospace Engineering     Open Access   (Followers: 80)
International Journal of Aerospace Psychology     Hybrid Journal   (Followers: 23)
International Journal of Aerospace Sciences     Open Access   (Followers: 30)
International Journal of Applied Geospatial Research     Hybrid Journal   (Followers: 7)
International Journal of Aviation Management     Hybrid Journal   (Followers: 8)
International Journal of Aviation Technology, Engineering and Management     Full-text available via subscription   (Followers: 7)
International Journal of Aviation, Aeronautics, and Aerospace     Open Access   (Followers: 4)
International Journal of Crashworthiness     Hybrid Journal   (Followers: 12)
International Journal of Micro Air Vehicles     Full-text available via subscription   (Followers: 11)
International Journal of Satellite Communications Policy and Management     Hybrid Journal   (Followers: 13)
International Journal of Space Science and Engineering     Hybrid Journal   (Followers: 11)
International Journal of Space Structures     Full-text available via subscription   (Followers: 17)
International Journal of Space Technology Management and Innovation     Full-text available via subscription   (Followers: 10)
International Journal of Sustainable Aviation     Hybrid Journal   (Followers: 5)
International Journal of Turbo and Jet-Engines     Hybrid Journal   (Followers: 6)
Investigación Pecuaria     Open Access   (Followers: 3)
Journal of Aerodynamics     Open Access   (Followers: 17)
Journal of Aeronautical Materials     Open Access   (Followers: 9)
Journal of Aeronautics & Aerospace Engineering     Open Access   (Followers: 28)
Journal of Aerospace Engineering     Full-text available via subscription   (Followers: 68)
Journal of Aerospace Engineering & Technology     Full-text available via subscription   (Followers: 16)
Journal of Aerospace Information Systems     Hybrid Journal   (Followers: 20)
Journal of Aerospace Information Systems     Hybrid Journal   (Followers: 32)
Journal of Aerospace Technology and Management     Open Access   (Followers: 7)
Journal of Aircraft     Hybrid Journal   (Followers: 337)
Journal of Aircraft and Spacecraft Technology     Open Access   (Followers: 8)
Journal of Airline and Airport Management     Open Access   (Followers: 12)
Journal of Astrobiology & Outreach     Open Access   (Followers: 3)
Journal of Aviation Technology and Engineering     Open Access   (Followers: 11)
Journal of Aviation/Aerospace Education & Research     Open Access   (Followers: 2)
Journal of Engineering and Technological Sciences     Open Access   (Followers: 1)
Journal of Guidance, Control, and Dynamics     Hybrid Journal   (Followers: 204)
Journal of KONBiN     Open Access   (Followers: 3)
Journal of Navigation     Hybrid Journal   (Followers: 279)
Journal of Propulsion and Power     Hybrid Journal   (Followers: 609)
Journal of Space Safety Engineering     Hybrid Journal   (Followers: 7)
Journal of Space Weather and Space Climate     Open Access   (Followers: 27)
Journal of Spacecraft and Rockets     Hybrid Journal   (Followers: 770)
Journal of Spatial Science     Hybrid Journal   (Followers: 3)
Journal of the American Helicopter Society     Full-text available via subscription   (Followers: 7)
Journal of the Astronautical Sciences     Hybrid Journal   (Followers: 8)
Journal of the Australasian Society of Aerospace Medicine     Open Access   (Followers: 1)
Journal of Wind Engineering and Industrial Aerodynamics     Hybrid Journal   (Followers: 16)
Life Sciences in Space Research     Hybrid Journal   (Followers: 3)
MAD - Magazine of Aviation Development     Open Access   (Followers: 2)
Mekanika : Jurnal Teknik Mesin i     Open Access   (Followers: 1)
Microgravity Science and Technology     Hybrid Journal   (Followers: 2)
New Space     Hybrid Journal   (Followers: 6)
Nonlinear Dynamics     Hybrid Journal   (Followers: 19)
npj Microgravity     Open Access   (Followers: 3)
Open Aerospace Engineering Journal     Open Access   (Followers: 1)
Population Space and Place     Hybrid Journal   (Followers: 9)
Problemy Mechatroniki. Uzbrojenie, lotnictwo, inżynieria bezpieczeństwa / Problems of Mechatronics. Armament, Aviation, Safety Engineering     Open Access   (Followers: 3)
Proceedings of the Human Factors and Ergonomics Society Annual Meeting     Hybrid Journal   (Followers: 16)
Proceedings of the Institution of Mechanical Engineers Part G: Journal of Aerospace Engineering     Hybrid Journal   (Followers: 45)
Progress in Aerospace Sciences     Full-text available via subscription   (Followers: 79)
Propulsion and Power Research     Open Access   (Followers: 67)
REACH - Reviews in Human Space Exploration     Full-text available via subscription   (Followers: 5)
Research & Reviews : Journal of Space Science & Technology     Full-text available via subscription   (Followers: 17)
RocketSTEM     Free   (Followers: 6)
Russian Aeronautics (Iz VUZ)     Hybrid Journal   (Followers: 24)
Science and Education : Scientific Publication of BMSTU     Open Access   (Followers: 1)
Space and Polity     Hybrid Journal   (Followers: 4)
Space Policy     Hybrid Journal   (Followers: 30)
Space Research Today     Full-text available via subscription   (Followers: 48)
Space Safety Magazine     Free   (Followers: 51)
Space Science International     Open Access   (Followers: 193)
Space Science Reviews     Hybrid Journal   (Followers: 97)
SpaceNews     Free   (Followers: 824)
Spatial Information Research     Hybrid Journal   (Followers: 1)
Technical Soaring     Full-text available via subscription   (Followers: 1)
Transport and Aerospace Engineering     Open Access   (Followers: 1)
Transportmetrica A : Transport Science     Hybrid Journal   (Followers: 8)
Unmanned Systems     Hybrid Journal   (Followers: 5)
Вісник Національного Авіаційного Університету     Open Access   (Followers: 2)

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Journal Cover
International Journal of Aviation, Aeronautics, and Aerospace
Journal Prestige (SJR): 0.174
Number of Followers: 4  

  This is an Open Access Journal Open Access journal
ISSN (Print) 2374-6793
Published by Embry-Riddle Aeronautical University Homepage  [4 journals]
  • The Detrimental Effect of Rainfall on Performance and Stability
           Characteristics of Aircrafts-A Comprehensive Review

    • Authors: Praneeth HR Mr et al.
      Abstract: The rapidly growing global market demands faster transit of human beings and goods even in unfavorable weather conditions of rainfall. The paper gives an overview of rain research methodologies, mathematical models to track raindrops in the flow field. The paper depicts the havoc rainfall causes on performance characteristics for various phases of flight in terms of evaluation of CL and CD and dynamic performance parameters such as short period mode. The knowledge obtained by this review paper could help designers to modify the design of aircraft such that it has better performance, stability, and control characteristics for all weather conditions.
      PubDate: Wed, 09 Dec 2020 07:45:46 PST
       
  • Active fault-tolerance of the unmanned aerial vehicle automatic control
           systems

    • Authors: Vuong Anh Trung et al.
      Abstract: This paper presents an introductory overview of principles of the three-layer hierarchy of active fault-tolerance, providing, determination of the fault type with as many details as enough to get recoverable fault reason and failure toleration by flexible redundancy using; the conception of active fault-tolerant control in abnormal modes is described. Developed models and methods of a systematic approach to fault tolerance in the direction of the effective use of the signal, parametric and structural redundancies and selection of parrying tools. Performed experimental researches of the unmanned aerial vehicle (UAV) automatic control systems (ACS).
      PubDate: Sun, 29 Nov 2020 20:05:23 PST
       
  • Real-Time Urban Weather Observations for Urban Air Mobility

    • Authors: Kevin A. Adkins et al.
      Abstract: Cities of the future will have to overcome congestion, air pollution and increasing infrastructure cost while moving more people and goods smoothly, efficiently and in an eco-friendly manner. Urban air mobility (UAM) is expected to be an integral component of achieving this new type of city. This is a new environment for sustained aviation operations. The heterogeneity of the urban fabric and the roughness elements within it create a unique environment where flight conditions can change frequently across very short distances. UAM vehicles with their lower mass, more limited thrust and slower speeds are especially sensitive to these conditions. Since traditional aviation weather products for observations and forecasts at an airport on the outskirts of a metropolitan area do not translate well to the urban environment, weather data for low-altitude urban airspace is needed and will be particularly critical for unlocking the full potential of UAM. To help address this need, crowdsourced weather data from sources prevalent in urban areas offer the opportunity to create dense meteorological observation networks in support of UAM. This paper considers a variety of potential observational sources and proposes a cyber-physical system architecture, including an incentive-based crowdsensing application, which empowers UAM weather forecasting and operations.
      PubDate: Sat, 28 Nov 2020 09:25:00 PST
       
  • Flight Surgeons, Aerospace Medicine And NATO Aeromedical Doctrine: Where
           Is The Alliance For Flight Safety'

    • Authors: Jacopo Frassini et al.
      Abstract: Where are flight surgeons heading to in NATO' How does the aeromedical community contribute to flight safety in allied air and space operations' What are the standards expected to deliver best practices in aerospace medicine' How can opportunities be translated in improvement' This paper describes the overall responsibilities, roles and functions of flight surgeons in the Alliance for the benefit of medical providers, policy makers, decision makers, planners and other stakeholders, wishing an easy overview of NATO aeromedical doctrine and a comprehensive reading of the core concepts otherwise fragmented in different Allied Publications.
      PubDate: Sat, 21 Nov 2020 09:18:45 PST
       
  • Prediction of Gate In Time of Scheduled Flights and Schedule Conformance
           using Machine Learning-based Algorithms

    • Authors: DEEPUDEV SAHADEVAN et al.
      Abstract: Prediction of Gate to Gate block time for scheduled flights is considered as one of the challenging tasks in Air Traffic Flow Management (ATFM)system. Establishing an effective and practically reliable model to manage the problem of block time variation is a significant work. The airlines do tend to pad or inflate block time to Actual Block time to calculate Schedule block times which is approved by aviation regulator. This will lead to flaws in air traffic flow strategic decision-making and in turn affect the efficiency, estimation and undesirable delays, which leads to traffic congestion and inefficient ground delay programs. This study evaluates the effectiveness of nonlinear and time varying regression models to predict block time with minimal attributes in order to solve the problem of difficulty in predicting the block time variation. The key research outcome of this paper is to trace the temporal variations of flying time for different aircraft types and to predict the variation of actual arrival time from the scheduled arrival time at the destination airport. Ultimately, a combination of M5P regression model and logistic regression model is proposed to predict early, delayed and on-time conformity with approved schedules. Analysis based on a realistic data set of a domestic airport pair (Mumbai International Airport and New Delhi International Airport) in India shows that the proposed model is able to predict in block time at the time of departure with an accuracy of minutes for of test instances. As a result of the scheduled arrival time performance (early, delayed and timely) has been classified accurately using Logistic regression Classifier of machine learning. The test results show that the proposed model uses a minimum number of attributes and less computational time to more accurately predict the actual arrival time and scheduled arrival performance without details on the weather.
      PubDate: Wed, 18 Nov 2020 13:14:42 PST
       
  • Experimental Evaluation of Strength Degradation Temperature for Carbon
           Epoxy Filament Wound Composite

    • Authors: Jai Krishna Mishra Mr et al.
      Abstract: Polymeric composites have been widely used in various structural and thermal aerospace applications. Polymeric composites having high strength and high modulus reinforcement are ideally suited for lot of critical aerospace applications as structure is designed with high specific strength and high specific modulus. In case of launch vehicles/ missile one such application is design and manufacturing of solid rocket motor casing with polymeric composites as it give high performance and reduces inert weight of propulsion system. The high specific strength and high specific modulus of composite materials makes it ideal choice for designing the composite rocket motor case (CRMC). These are manufactured with filament winding process. As per ASTM D 2290 test method, the apparent tensile strength can be evaluated by preparing ring specimens from filament wound shell which simulates the hoop winding and cylindrical geometry of composite motor case. During flight in trajectory, the temperature on external surface of rocket motor will rise due to kinetic heating as result of aerodynamic drag. The mechanical properties of FRP composites degrades beyond certain temperature, depending primarily upon resin system and its glass transition temperature (Tg). In present work, the method of ring fabrication using filament winding is used to prepare test samples to experimentally test and evaluate apparent tensile strength with temperature of Carbon Epoxy composite. The tensile test at ambient is also done on specimens made from carbon Epoxy laminate using filament winding technique and are compared with ring test results.. The Glass Transition temperature (Tg) for Carbon Epoxy is also determined with Dry Scanning Calorimetry (DSC) technique
      PubDate: Mon, 16 Nov 2020 13:50:48 PST
       
  • Simulation Analysis of the Effects of Performance-Based Navigation on Fuel
           and Block Time Efficiency

    • Authors: Shlok Misra
      Abstract: The commercial aviation industry has been grown steadily in the past decade in terms of the number of flights operated and passengers traveled. The Federal Aviation Administration has introduced several technologies and initiatives under the NextGen Program. Performance-Based Navigation (PBN) is one such technology that is aimed at improving the efficiency of the National Airspace System which will improve system capacity and reduce delays. The airlines operate with restrained resources and investments into reducing fuel costs and flight times will directly or indirectly impact profit margins. PBN procedures and routes can help airlines reduce block times as flights will be able to fly more direct routes and utilize more efficient procedures in the terminal airspace. The study is aimed at analyzing the effect of PBN on fuel and block time efficiency for a flight. The study utilized a quantitative research method and utilized simulations of 20 flights on 10 different city-pairs. The 10 city-pairs were selected to sample routes of different distances. 10 flights were simulated utilizing the lowest form of PBN capability and without Global Positioning System (GPS) procedures and the other 10 flights utilized the highest PBN capability and GPS procedures. A comparative analysis was carried out with the data retrieved from the simulations for the 10 city-pairs. The results indicated that flight time could be reduced by an average of 7.3% by utilizing enhanced PBN procedures and fuel usage could be reduced by an average of 2.3%. The benefits offered by PBN improved with an increase in route distances due to larger fuel and time savings.
      PubDate: Wed, 11 Nov 2020 15:48:30 PST
       
  • Solar One: A Proposal for The First Crewed Interstellar Spacecraft

    • Authors: Alberto Caballero
      Abstract: In this paper it is presented the concept and design of a new type of spacecraft that could be used to make the first manned interstellar travel. Solar one would integrate three near-term technologies, namely: compact nuclear fusion reactors, extremely large light sails, and high-energy laser arrays. A system of lenses or mirrors to propel the sail with sunlight is suggested as an alternative to laser propulsion. With a mile-long light sail, Solar One could reach an average of 22% the speed of light, arriving to the closest potentially habitable exoplanet in less than 19 years with the help of a Bussard scoop producing reverse electromagnetic propulsion. Key challenges are reducing the weight of continuous-wave lasers and compact fusion reactors as well as achieving cryo-sleep and artificial gravity.
      PubDate: Tue, 10 Nov 2020 14:25:09 PST
       
  • A Review of DJI’s Mavic Pro Precision Landing Accuracy

    • Authors: Cody Yoakum et al.
      Abstract: Precision landing has the potential to increase the accuracy of autonomous landings. Unique applications require specific landing performance; for example, wireless charging loses efficiency with a misalignment of 100mm. Unfortunately, there is no publicly available information for the DJI Mavic Pro’s landing specifications. This research investigated the ability of a Mavic Pro to land at a specified point accurately. The purpose of this research is to determine if precision landings are more accurate than non-precision autonomous landings and if the Mavic Pro is capable of applications such as wireless charging when using precision landings. A total of 128 (64 precision and 64 non-precision) landings were recorded. A two-tail two-sample t-test compared the differences between Precision Landing On vs. Precision Landing Off (PLON vs. PLOFF). Data showed statistical evidence to reject the null hypothesis indicating there was a statistical performance in mean landing accuracy with PLON (M = 3.45, SD = 1.30) over PLOFF (M = 4.40, SD = 1.89), t(109) = -3.313, p = 0.0013. A one-tail one-sample t-test comparing the landing distance of PLON to 100mm (distance for effective wireless charging) produced statistical evidence to reject the null hypothesis indicating the PLON landing accuracy (M = 87.63mm, SD = 33.02mm) was less than 100mm, t(62) = -2.98, p = 0.002. Evidence showed that precision landings increased the landing performance and may allow for future potential applications, including wireless charging.
      PubDate: Sat, 07 Nov 2020 07:39:59 PST
       
  • IMPACT OF ELECTRONIC FLIGHT BAG (EFB) ON SINGLE PILOT PERFORMANCE AND
           WORKLOAD

    • Authors: Saravanan Suppiah et al.
      Abstract: The increase of automation in the aviation industry poses challenges to human performance. To attest this point, studies about aircraft accidents reveal that pilots’ response to automated systems is not always coherent. Research findings suggest that pilots’ interaction with automated systems in highly demanding task situations results in an increase in workload, and if they are unable to resolve it in time, it will compromise flight safety. Therefore, in the interest to further explore the impact of automation on human factor constructs, the study aimed to investigate the impact of Electronic Flight Bag (EFB) on pilot workload. The study measured the workload experienced by pilots in a visual flight rule approach in expected and unexpected situations with the use of EFB and paper chart displays. The National Aeronautics and Space Administration -Task Load Index was used to measure pilot workload. The results showed a significant difference in pilot workload between expected and unexpected approaches indicating the influence of pilot workload during highly demanding tasks. However, there was no significant difference in the pilot workload between the use of EFB and paper at approach. There was also no significant interaction between approach and display. It is suggested that future studies increase the sample size and explore more demanding flight situations that allow further use of EFB functionalities.
      PubDate: Fri, 06 Nov 2020 19:39:14 PST
       
  • Experimental and Computational Evaluation of Five Hole Five Probe Flow
           Analyzer for Subsonic Wind Calibration

    • Authors: Akhila Rupesh Ms et al.
      Abstract: It is very essential to predict the flow and its related parameters to understand real life fluid flow. The real-life fluid problems are studied with wind tunnels which gives very efficient results in practice. But in the case of wind tunnel studies flow angularities plays crucial role. Flow angularity determination includes measurement of static pressure, dynamic pressure and inflow angles. Flow prediction even hold a very strong hand in design process. Designing and testing being the foundation of any process industry, flow measurements and its related parameters have to be well evaluated. In such cases, wind tunnels play important role and the researchers are usually dependent on wind tunnels to carry out experiments at different Mach numbers to obtain experimental results. It is mandatory to check the flow parameters and maturity rates including turbulence, flow angularity, strain, velocity, temperature and density distribution at the test section before testing a model. The flow field and degree of maturity within the test section can be analysed with any instrument that will provide a flow field data diagram of test parts. In this paper, the performance evaluation and truthiness of five-hole five probe flow analyser is being evaluated computationally and experimentally at various Mach Numbers.
      PubDate: Wed, 28 Oct 2020 05:39:56 PDT
       
  • Converting the Aircraft Passenger’s Cabin to an Airship When There
           Is a Danger of Crash

    • Authors: Abouzar Bahari
      Abstract: From the beginning of the airplane invention until now, many kinds of airliners have been introduced by different companies to transport the people throughout the world. However, although the manufacturing companies have highly promoted the technical and safety systems of the airliners and made them the safest traveling equipment, there is still a possibility of their failure in the technical and/ or safety systems. The serious faults that may occur in an aircraft during the flight can cause the loss of its control. Improving the aircraft safety to guarantee the security, both bodily and spiritually, is of a high demand. We have introduced a new airliner design to convert its passengers’ cabin to a Helium airship when dangerous incident happened. Nonetheless, before the mentioned conversion, the aircraft speed must be reduced. During this step, the gasoline storage must be jetted quickly into the air. To calculate how much volume of the Helium gas is required to float the passengers’ cabin, we need to know the “lifting capacity” of the Helium.
      PubDate: Sat, 24 Oct 2020 08:48:24 PDT
       
  • Performance Characteristics Design of Pulsed Plasma Thrusters for Drag
           Counter-Reacting

    • Authors: Sam Dakka Dr
      Abstract: Determining the performance characteristics of off the shelf pulsed plasma thrusters to enhance the life time of low earth orbiting platforms was investigated theoretically. Pulsed plasma thruster analysis was accomplished through development of correlations from historical data that distinguished between breech fed propellant to side fed propellant designs. Based on semi-empirical equations the power required by the thruster to counter react the drag was estimated and mapped for 1U to 27U CubeSat configurations for altitude ranging between 200km to 600km. It appears that the power required is dependent on the feeding delivery system design. For side fed designs the power required to counter react the drag is 30.03% lower as compared with breech fed pulsed plasma thrusters designs. The methodologies and analysis implemented can shorten the spacecraft preliminary design phase and reduce the time and cost associated with development of spacecraft missions
      PubDate: Mon, 19 Oct 2020 12:05:14 PDT
       
  • The Current State of Counter Unmanned Aerial System Policy in the U.S.

    • Authors: Travis L. Cline et al.
      Abstract: Threats from drones are becoming an increasing security concern throughout the U.S. and worldwide. No current standards exist for the manufacture and operation of counter unmanned aerial system technology, making it difficult to determine effective systems and components for specific uses. Current policy within the U.S. makes unmanned aerial system (UAS) interdiction illegal for all but a few Federal entities currently. This document is a summary of counter unmanned aerial systems policy within the U.S.
      PubDate: Thu, 01 Oct 2020 09:21:37 PDT
       
  • Low thrust and low power propulsion systems options for small satellites

    • Authors: Redha Amri
      Abstract: The present work focuses on the study of low thrust propulsion systems. Cold gas, thermal and monopropellant systems with a blow down depressurisation mode have been taken in consideration in this study. Most of propellants that can be used for small satellite propulsion systems were selected here in order to give the propulsion engineer many propellant options with a good idea about the performance of each propellant, and this is important to make a good trade-off during the system design. For cold gas and thermal propulsion, the propellants taken into account in this study are: Oxygen (O2), Nitrogen (N2), Hydrogen (H2), Carbon dioxide (CO2), Helium (He), Xenon (Xe), Methane (CH4), Propane (C3H8) and Butane (C4H10). The purpose of this part is to determine numerically the temperature after heating, specific impulse (Isp), C* and isentropic parameter (γ) as a function of the consumed heat (which represents the power of the heater). After heating, 2D axisymmetric fluid flow (with variable specific heat Cp(T) ) inside the nozzle was selected in this study. For monopropellants, the decomposition of hydrazine (N2H4), hydrogen peroxide (H2O2) and nitrous oxide (N2O) have been studied numerically to determine all the thermochemical and performance parameters, using 2D frozen flow (with Cp(T)) inside the nozzle. As an application, 15 watts butane thruster and hydrogen peroxide monopropellant thruster have been analysed to estimate the performance (Isp). The results obtained were compared with experimental results; the comparison shows good agreement where the difference is less than 4 %.
      PubDate: Sun, 20 Sep 2020 17:29:52 PDT
       
  • Contingency Fuel Reduction in Brazil

    • Authors: Diogo Youssef et al.
      Abstract: This project reviews the minimum fuel regulations for commercial passenger flights in different countries and intends to scientifically support a change in the existing contingency fuel requirement regulation in Brazil. This change represents fuel savings for Brazilian air operations, and it deploys into a competitive advantage for Brazilian airlines compared to foreign air operators.Discussion: The objective of this project is to provide the Brazilian civil aviation regulators with the necessary data to justify the reduction of the contingency fuel values from the current 10% to 5%. This project bases the analysis on the historical data of fuel planning and fuel consumption from two major Brazilian airlines, operating under the Civil Aviation Regulation RBAC 121. The historical evidence is analyzed by establishing relationships between flight planning and execution, indicating the fuel that was planned and consumed at each stage of the flight. The analysis of the impact in the contingency fuel change from 10% to 5% was made by simulating multiple scenarios capable of creating different fuel quantities for flight planning and random consumption values. The mathematical model is simulated using the Monte Carlo methodology, which calculates the amount of remaining fuel from each simulated flight to analyze the operational risk, then support decision making. Therefore, this project presents a theoretical and practical proposal that was implemented on April 1st, 2020, to reduce the minimum contingency fuel values required by Brazilian regulation, with a focus on safe and efficient flight operations.
      PubDate: Wed, 16 Sep 2020 20:24:13 PDT
       
  • Analysis of the ICAO USOAP Results in the Persian Gulf Region and its
           Relation to the Economic Indicators

    • Authors: Mohsen Ghahremani
      PubDate: Tue, 25 Aug 2020 14:54:59 PDT
       
  • Automatic Gaze Classification for Aviators: Using Multi-task Convolutional
           Networks as a Proxy for Flight Instructor Observation

    • Authors: Justin Wilson et al.
      Abstract: In this work, we investigate how flight instructors observe aviator scan patterns and assign quality to an aviator's gaze. We first establish the reliability of instructors to assign similar quality to an aviator's scan patterns, and then investigate methods to automate this quality using machine learning. In particular, we focus on the classification of gaze for aviators in a mixed-reality flight simulation. We create and evaluate two machine learning models for classifying gaze quality of aviators: a task-agnostic model and a multi-task model. Both models use deep convolutional neural networks to classify the quality of pilot gaze patterns for 40 pilots, operators, and novices, as compared to visual inspection by three experienced flight instructors. Our multi-task model can automate the process of gaze inspection with an average accuracy of over 93.0% for three separate flight tasks. Our approach could assist existing flight instructors to provide feedback to learners, or it could open the door to more automated feedback for pilots learning to carry out different maneuvers.
      PubDate: Fri, 14 Aug 2020 11:44:09 PDT
       
  • Risk - A Multi-Layered Approach

    • Authors: Peter S. Neff
      Abstract: This article discusses the relationship between the mandates to achieve increased operational safety and the application of risk management strategies. That commercial airlines must operate at the highest level of safety is mandated by statute. FAA regulation, 14 CFR part 5, outlines the FAA response to the requirements of ICAO Annex 19, Safety Management, by establishing requirements for certificate holders to develop a Safety Management System with 4 components: (a) Safety Policy; (b) Safety Risk Management; (c) Safety Assurance; and (d) Safety Promotion. Safety is a tangible and intangible element foundational to the successful commercial airline sector. A structured multi-layered risk analysis is the basis for operational decisions that support that premise. To achieve the next level of safety, this article outlines the multi-layered risk management practices required to support safety goals. At the strategic level, management should implement a predictive risk management process to forecast future potential hazards and allocate organizational financial and materiel resources to mitigate risks. At the intermediate tactical risk level, flight crews should use a Risk Assessment tool or a PAVE or DECIDE mnemonic as a formalized, structured proactive risk management tool. The 3P model provides a more immediate reactive risk management decision tool to analyze rapidly changing conditions and to adjust the course of action required to effect the desired safe outcome. The article posits that this multi-layered approach to analyzing hazards and implementing appropriate risk mitigation strategies is mandatory to achieve a future of continued operational safety improvements in the commercial airline sector.
      PubDate: Sun, 02 Aug 2020 07:39:10 PDT
       
  • Mini Unmanned Aerial Systems (UAV) - A Review of the Parameters for
           Classification of a Mini UAV.

    • Authors: Ramesh PS et al.
      Abstract: In the recent years, Mini Unmanned Aerial Vehicle (UAV) has generated a lot of interest both in military and civilian applications. Contemporary innovations have seen the entry of Mini UAV into a wide range of hitherto fore unexplored domains. Advancement in computer systems, miniaturisation of electronics, artificial intelligence and composite materials is propelling the development of Mini UAV. Mini UAV is a class of UAV within the large family of unmanned systems categorised by a set of parameters. However, there are glaring inconsistencies and lack of uniformity in specifying the parameters which define a Mini UAV. The paper explores the factors which define a Mini UAV to establish itself as a distinct class. Based on the review of the recent literature and various manufacturer’s data of Mini UAVs, both fixed-wing and rotary-wing, categorisation of Mini UAV have been analysed considering functional requirements of operating altitude, endurance, operating range, maximum take-off weight and size.
      PubDate: Sun, 02 Aug 2020 06:59:17 PDT
       
 
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