Journal articles: 'Flight characteristics'

1

PRISACARIU, Vasile. "ANALYSIS OF UAVs FLIGHT CHARACTERISTICS." Review of the Air Force Academy 16, no. 3 (December 19, 2018): 29–36. http://dx.doi.org/10.19062/1842-9238.2018.16.3.4.

Full text

APA, Harvard, Vancouver, ISO, and other styles

2

BRUDERER, BRUNO, and ANDREAS BOLDT. "Flight characteristics of birds:." Ibis 143, no. 2 (April 2001): 178–204. http://dx.doi.org/10.1111/j.1474-919x.2001.tb04475.x.

Full text

APA, Harvard, Vancouver, ISO, and other styles

3

Wilhelm, Frank H., and Walton T. Roth. "Clinical Characteristics of Flight Phobia." Journal of Anxiety Disorders 11, no. 3 (May 1997): 241–61. http://dx.doi.org/10.1016/s0887-6185(97)00009-1.

Full text

APA, Harvard, Vancouver, ISO, and other styles

4

Bader, Gail Byrne, Maureen Terhorst, Patricia Heilman, and Judith A. DePalma. "Characteristics of flight nursing practice." Air Medical Journal 14, no. 4 (October 1995): 214–18. http://dx.doi.org/10.1016/1067-991x(95)90005-5.

Full text

APA, Harvard, Vancouver, ISO, and other styles

5

SUZUKI, Shota, Shinichiro ITO, and Masaki HIRATUKA. "Flight characteristics of flying discs." Proceedings of the Symposium on sports and human dynamics 2020 (2020): B—5–2. http://dx.doi.org/10.1299/jsmeshd.2020.b-5-2.

Full text

APA, Harvard, Vancouver, ISO, and other styles

6

Öznalbant, Zafer, and Mehmet Ş. Kavsaoğlu. "Flight control and flight experiments of a tilt-propeller VTOL UAV." Transactions of the Institute of Measurement and Control 40, no. 8 (February 26, 2018): 2454–65. http://dx.doi.org/10.1177/0142331218754618.

Full text

Abstract:

The purpose of this work is to present a study on the stability and control of an unmanned, fixed wing, vertical take-off and landing aerial vehicle. This airplane is driven by a fixed-pitch tilt-propeller system with the capability of vertical take-off and landing as well as conventional flight. The novelty of the vehicle is the use of a fixed-pitch propeller system instead of variable-pitch tilt-rotors. There are three flight modes: vertical, transitional and conventional flight modes. Each flight mode has different dynamic characteristics. Therefore, these modes each need dedicated flight control methods. In this paper, the equations of motion are generated by modelling the aerodynamic and propulsion forces and moments. After performing trim condition calculations, longitudinal stability characteristics are investigated for each flight mode. The control methods are described for vertical, transitional and conventional flight modes. Stability augmentation systems, which consist of proportional and proportional/integral controller, are applied. A number of flight tests, including vertical, transitional and conventional flights, have been successfully performed with a prototype aircraft.

APA, Harvard, Vancouver, ISO, and other styles

7

Chen, Jiu Sheng, and Xiao Yu Zhang. "Modeling of Flight Arrival Scheduling Based on Fuzzy Programming." Applied Mechanics and Materials 313-314 (March 2013): 995–98. http://dx.doi.org/10.4028/www.scientific.net/amm.313-314.995.

Full text

Abstract:

The issue of flight arrival in civil airport is a typical problem of discrete event dynamic system. IN Time is a random variable. According to the characteristics of arrival flights, flight delay cost as objective function, the fuzzy model for scheduling arrival flights is established. In the case of growing air traffic, the model is a better opinion for scientific optimum ordering matter in air traffic control system. It can improve flight operation on time.

APA, Harvard, Vancouver, ISO, and other styles

8

Karmali, Faisal, and Mark Shelhamer. "The dynamics of parabolic flight: Flight characteristics and passenger percepts." Acta Astronautica 63, no. 5-6 (September 2008): 594–602. http://dx.doi.org/10.1016/j.actaastro.2008.04.009.

Full text

APA, Harvard, Vancouver, ISO, and other styles

9

Yang, Zi-Yi, and Rong-Jiun Sheu. "EFFECTS OF FLIGHT ROUTE VARIATION AND GREAT-CIRCLE APPROXIMATION ON AVIATION DOSE ASSESSMENT FOR POPULAR FLIGHTS FROM TAIWAN." Radiation Protection Dosimetry 184, no. 1 (October 31, 2018): 79–89. http://dx.doi.org/10.1093/rpd/ncy186.

Full text

Abstract:

Abstract Galactic cosmic-ray-induced secondary particles in the atmosphere constitute an important source of radiation exposure to airline crews and passengers. In this study, a systematic dose assessment was conducted for 11 popular flights from Taiwan, with an emphasis on the effects of flight route variation and assumption. The case studies covered a broad range of commercial flights departing from Taipei, from a domestic flight of <1 h to a long-haul international flight of more than 14 h. For each route under study, information on 100 actual flight routes was retrieved from flight tracking data collected from June to September 2017, and the information was analyzed using a self-developed program called the ‘NTHU Flight Dose Calculator’. The resulting distribution of route doses provided not only the mean value and associated standard deviation but also information on the characteristics of aviation dose assessment and management. Furthermore, compared with actual flight routes, the dose differences introduced by great-circle approximation were evaluated, and the effects of solar activity on the dose assessment of these flights were reported.

APA, Harvard, Vancouver, ISO, and other styles

10

Cao, Yihua, Zhenlong Wu, Yuan Su, and Zhongda Xu. "Aircraft flight characteristics in icing conditions." Progress in Aerospace Sciences 74 (April 2015): 62–80. http://dx.doi.org/10.1016/j.paerosci.2014.12.001.

Full text

APA, Harvard, Vancouver, ISO, and other styles

11

Cao, Yihua, Guozhi Li, and R. A. Hess. "Helicopter flight characteristics in icing conditions." Aeronautical Journal 116, no. 1183 (September 2012): 963–79. http://dx.doi.org/10.1017/s0001924000007375.

Full text

Abstract:

Abstract A method to predict the effects of rotor icing on the flight characteristics of a UH-60A helicopter is presented. By considering both natural ice shedding and different types of ice accretion due to local temperature variations on the blade surface, an improved rotor icing model was developed. Next, the effects of icing on rotor force, torque and flapping were incorporated in a nonlinear helicopter dynamic model. Based upon icing design envelopes in cumuliform clouds, trim and stability characteristics were studied. Further development of the helicopter state-space model allowed control and handling qualities characteristics to be investigated with variation of the three icing-related cloud variables (atmospheric temperature, liquid water content, and median volumetric diameter). Results indicated that this method of evaluating rotorcraft icing is both feasible and useful.

APA, Harvard, Vancouver, ISO, and other styles

12

MIYATA, Takahiro, and Tomomi KOJO. "419 Flight Characteristics of Pantala flavescens." Proceedings of the JSME Bioengineering Conference and Seminar 2004.17 (2005): 169–70. http://dx.doi.org/10.1299/jsmebs.2004.17.0_169.

Full text

APA, Harvard, Vancouver, ISO, and other styles

13

Potasman, I., O. Rofe, and B. Weller. "Flight-Associated Headaches—Prevalence and Characteristics." Cephalalgia 28, no. 8 (August 2008): 863–67. http://dx.doi.org/10.1111/j.1468-2982.2008.01601.x.

Full text

Abstract:

Environmental factors in airplanes may precipitate headaches. We conducted a questionnaire-based study among consecutive travellers to determine the rate, severity and duration of flight-associated headaches (FAHA). Of the 906 eligible travellers (mean age 33.3 ± 13.8 years), 22.3% reported headaches at least once per month. FAHA occurred in 52 travellers (5.7%), of whom 34 were women ( P = 0.0023 vs. none FAHA). The duration of pain was 4.0 ± 10.2 h after takeoff and continued for 5.7 ± 14.2 h after landing. Migraine was diagnosed in 19.2% of those with FAHA. The magnitude of headache was 6 ± 2 (on a scale of 1-10). Among those who suffer from FAHA, 45.4% reported that their pain was unilateral, in contrast to 72.7% among those with ‘non-flight’ headaches ( P = 0.019). Nine travellers had headaches when descending to −400 m below sea level, and nine upon climbing to high altitude. This preliminary observation indicates that FAHA is not uncommon and should be further investigated.

APA, Harvard, Vancouver, ISO, and other styles

14

Yeadon, M. R., M. A. King, and E. J. Sprigings. "Pre-flight characteristics of Hecht vaults." Journal of Sports Sciences 16, no. 4 (January 1998): 349–56. http://dx.doi.org/10.1080/02640419808559363.

Full text

APA, Harvard, Vancouver, ISO, and other styles

15

Sherub, Sherub, Gil Bohrer, Martin Wikelski, and Rolf Weinzierl. "Behavioural adaptations to flight into thin air." Biology Letters 12, no. 10 (October 2016): 20160432. http://dx.doi.org/10.1098/rsbl.2016.0432.

Full text

Abstract:

Soaring raptors can fly at high altitudes of up to 9000 m. The behavioural adjustments to high-altitude flights are largely unknown. We studied thermalling flights of Himalayan vultures ( Gyps himalayensis ) from 50 to 6500 m above sea level, a twofold range of air densities. To create the necessary lift to support the same weight and maintain soaring flight in thin air birds might modify lift coefficient by biophysical changes, such as wing posture and increasing the power expenditure. Alternatively, they can change their flight characteristics. We show that vultures use the latter and increase circle radius by 35% and airspeed by 21% over their flight altitude range. These simple behavioural adjustments enable vultures to move seamlessly during their annual migrations over the Himalaya without increasing energy output for flight at high elevations.

APA, Harvard, Vancouver, ISO, and other styles

16

LAUK, Peep, Karl-Erik SEEGEL, and Toivo TÄHEMAA. "IMPACT OF VARIABLE GEOMETRY MINIFLAPS ON SAILPLANE FLIGHT CHARACTERISTICS." Aviation 21, no. 4 (December 21, 2017): 119–25. http://dx.doi.org/10.3846/16487788.2017.1415228.

Full text

Abstract:

Miniflaps (also known as mini-TED, active Gurnay flaps, etc.) located at the wing trailing edge enable to increase wing lift and reduce the aerodynamic drag. Variable geometry miniflaps (VGMF) elaborated at the Estonian Aviation Academy enable to expand the wing area up to 6.5%, when extended, and, at the same time, deflect 16.7 degrees downwards. The use of VGMF is especially promising for reducing the airspeed and sink speed of modern high wing loading sailplanes flying in thermals. The VGMFs were built in cooperation with the Lithuanian company JSC “Sportine Aviacija ir Ko”. They were fixed inside the sailplane LAK-17B trailing flaps. During the test flights, the VGMF effect on the sailplane’s sink speed was measured at different airspeeds and different flap positions. The flight parameters were recorded electronically and later calculated for standard atmosphere. The method of parallel flight was used for comparison. The results indicate that with the flaps position at + 9 degrees, the CAS 79.5 km/h sink speed decreased 0.775–0.555 m/s, i.e. 39.6%. The sailplane’s wing loading was 39.4 kg/m 2. With the flaps position at + 15 degrees, the optimal airspeed decreased, but the sink speed, compared to the previous, rose. Cl max increased with the VGMF 1.41–1.58 (i.e. 12%).

APA, Harvard, Vancouver, ISO, and other styles

17

Howell, Ryan G., Ryan R. Jensen, Steven L. Petersen, and Randy T. Larsen. "Measuring Height Characteristics of Sagebrush (Artemisia sp.) Using Imagery Derived from Small Unmanned Aerial Systems (sUAS)." Drones 4, no. 1 (February 19, 2020): 6. http://dx.doi.org/10.3390/drones4010006.

Full text

Abstract:

In situ measurements of sagebrush have traditionally been expensive and time consuming. Currently, improvements in small Unmanned Aerial Systems (sUAS) technology can be used to quantify sagebrush morphology and community structure with high resolution imagery on western rangelands, especially in sensitive habitat of the Greater sage-grouse (Centrocercus urophasianus). The emergence of photogrammetry algorithms to generate 3D point clouds from true color imagery can potentially increase the efficiency and accuracy of measuring shrub height in sage-grouse habitat. Our objective was to determine optimal parameters for measuring sagebrush height including flight altitude, single- vs. double- pass, and continuous vs. pause features. We acquired imagery using a DJI Mavic Pro 2 multi-rotor Unmanned Aerial Vehicle (UAV) equipped with an RGB camera, flown at 30.5, 45, 75, and 120 m and implementing single-pass and double-pass methods, using continuous flight and paused flight for each photo method. We generated a Digital Surface Model (DSM) from which we derived plant height, and then performed an accuracy assessment using on the ground measurements taken at the time of flight. We found high correlation between field measured heights and estimated heights, with a mean difference of approximately 10 cm (SE = 0.4 cm) and little variability in accuracy between flights with different heights and other parameters after statistical correction using linear regression. We conclude that higher altitude flights using a single-pass method are optimal to measure sagebrush height due to lower requirements in data storage and processing time.

APA, Harvard, Vancouver, ISO, and other styles

18

DUBKOV, A. A., B. SPAGNOLO, and V. V. UCHAIKIN. "LÉVY FLIGHT SUPERDIFFUSION: AN INTRODUCTION." International Journal of Bifurcation and Chaos 18, no. 09 (September 2008): 2649–72. http://dx.doi.org/10.1142/s0218127408021877.

Full text

Abstract:

After a short excursion from the discovery of Brownian motion to the Richardson "law of four thirds" in turbulent diffusion, the article introduces the Lévy flight superdiffusion as a self-similar Lévy process. The condition of self-similarity converts the infinitely divisible characteristic function of the Lévy process into a stable characteristic function of the Lévy motion. The Lévy motion generalizes the Brownian motion on the base of the α-stable distributions theory and fractional order derivatives. Further development on this idea lies on the generalization of the Langevin equation with a non-Gaussian white noise source and the use of functional approach. This leads to the Kolmogorov's equation for arbitrary Markovian processes. As a particular case we obtain the fractional Fokker–Planck equation for Lévy flights. Some results concerning stationary probability distributions of Lévy motion in symmetric smooth monostable potentials, and a general expression to calculate the nonlinear relaxation time in barrier crossing problems are derived. Finally, we discuss the results on the same characteristics and barrier crossing problems with Lévy flights, recently obtained by different approaches.

APA, Harvard, Vancouver, ISO, and other styles

19

Natiq qızı Nurullazadə, Fidan. "Evaluation of flight conditions at tropopause level." NATURE AND SCIENCE 07, no. 02 (April 23, 2021): 49–52. http://dx.doi.org/10.36719/2707-1146/07/49-52.

Full text

Abstract:

High-quality organization of meteorological support along the flight routes, increasing its efficiency depends on many factors. These factors include the moderate and high intensity turbulence observed in the middle and upper flight echelons, icing, jet streams, volcanic ash clouds and their distribution areas, tropopause level, its altitude, and others. In the pre-flight preparation phase, the meteorological body provides meteorological support for all types of domestic and international flights planned in the middle and upper troposphere. The organization of flight efficiency and economic profitability depends on the high-quality forecast of the above-mentioned meteorological factors. The article analyzes the characteristics of weather conditions that affect flights in the middle and upper troposphere. The main recommendations and requirements of Annex 3 (ANEX 3) and its amendments (Amendment 79), ICAO's guidelines for meteorological support for international air navigation, are relevant to many of the issues discussed in this article. Key words: turbulence, jet stream, volcanic ash, aircraft, tropopause, aviation, flight echelon, pressure, wind, temperature, meteorological support, flight route

APA, Harvard, Vancouver, ISO, and other styles

20

Yanagihara, Masaaki, Masashi Shigemi, and Takanobu Suito. "Estimating Aerodynamic Characteristics of Automatic Landing Flight Experiment Vehicle Using Flight Data." Journal of Aircraft 36, no. 6 (November 1999): 926–33. http://dx.doi.org/10.2514/2.2553.

Full text

APA, Harvard, Vancouver, ISO, and other styles

21

Watanabe, Shigeya, Shinji Ishimoto, and Yukimitsu Yamamoto. "Aerodynamic Characteristics Evaluation of Hypersonic Flight Experiment Vehicle Based on Flight Data." Journal of Spacecraft and Rockets 34, no. 4 (July 1997): 464–70. http://dx.doi.org/10.2514/2.3259.

Full text

APA, Harvard, Vancouver, ISO, and other styles

22

GAO, Honggang, Ao HE, Zhenghong GAO, Yang NA, and Yangping DENG. "Flight dynamics characteristics of canard rotor/wing aircraft in helicopter flight mode." Chinese Journal of Aeronautics 32, no. 7 (July 2019): 1577–87. http://dx.doi.org/10.1016/j.cja.2019.04.002.

Full text

APA, Harvard, Vancouver, ISO, and other styles

23

Munoz, Claudia, Henry Laniado, and Jorge Córdoba. "Airline choice model for an international round-trip flight considering outbound and return flight schedules." Archives of Transport 54, no. 2 (June 30, 2020): 75–93. http://dx.doi.org/10.5604/01.3001.0014.2969.

Full text

Abstract:

This paper quantified the impact of outbound and return flight schedule preferences on airline choice for international trips. Several studies have used airline choice data to identify preferences and trade-offs of different air carrier service attributes, such as travel time, fare and flight schedule. However, estimation of the effect return flight schedules have on airline choice for an international round-trip flight has not yet been studied in detail. Therefore, this study introduces attributes related to return flight characteristics and round-trip flight schedule interaction into the airline choice models, which have not previously been reported in the literature. We developed a stated preference survey that includes round-trip fares based on flight schedule combinations and the number of days prior to departure fares was purchased. We applied modelling techniques using a set of stated preference data. A mixed logit model was tested for the presence of heterogeneity in passengers' preferences. Our results indicated that models with attributes related to return flight and its interaction with outbound flight attributes have a superior fit compared with models only based on attributes reported in the literature review. The model found shows that airfare, travel time, arrival preference schedule in the outward journey, departure preference in the return journey and the schedule combination of round-trip flight are significantly affecting passenger choice behaviour in international round-trip flights. Sensitivity analysis of airline service characteristics and their marketing implications are conducted. The analysis reports seven policies with the greatest impact on each airline choice probabilities. It shows that by reducing travel time and airfare and by adopting an afternoon and night schedule preference for outbound and return flight, respectively, the highest probability on airline choice would be reached. This research contributes to the current literature by enhancing the understanding of how passengers choose airlines, considering both outbound and inbound journey characteristics. Thus, this study provides an analytical tool designed to provide a better understanding of international round-trip flight demand determinants and support carrier decisions.

APA, Harvard, Vancouver, ISO, and other styles

24

Woodrow, K. P., A. G. Gatehouse, and D. A. Davies. "The effect of larval phase on flight performance of African armyworm moths, Spodoptera exempta (Walker) (Lepidoptera: Noctuidae)." Bulletin of Entomological Research 77, no. 1 (March 1987): 113–22. http://dx.doi.org/10.1017/s0007485300011597.

Full text

Abstract:

AbstractThe characteristics of the high and low density forms of noctuid moths, including Spodoptera exempta (Walker), exhibiting a density-dependent phase polyphenism have frequently been discussed in relation to migration. However, the only previous (unpublished) demonstration of an effect of larval phase on adult flight performance, using a tethered-flight technique, was invalidated by the recent discovery that the principal determinant of flight potential in S. exempta is genetic. When the incidence of prolonged flight was measured in moths derived from genetically-matched (full-sib) samples, there was a clear increase in long flights by females derived from the high-density gregaria phase larvae compared with those from solitaria phase larvae. The reasons for the apparent absence of a similar effect in males is not clear, but it is possible that the tethered-flight technique provides a less reliable index of flight capacity in this sex. The characteristics and significance of phase polyphenism in migratory noctuids are discussed. It is suggested that, in S. exempta and possibly some other comparable species, the high-density phase is adapted to accelerate re-dispersal after populations become concentrated, in order to escape the detrimental consequences of high larval densities.

APA, Harvard, Vancouver, ISO, and other styles

25

Gómez-López, José Miguel, José Luis Pérez-García, Antonio Tomás Mozas-Calvache, and Jorge Delgado-García. "Mission Flight Planning of RPAS for Photogrammetric Studies in Complex Scenes." ISPRS International Journal of Geo-Information 9, no. 6 (June 16, 2020): 392. http://dx.doi.org/10.3390/ijgi9060392.

Full text

Abstract:

This study describes a new approach to Remotely Piloted Aerial Systems (RPAS) photogrammetric mission flight planning. In this context, we have identified different issues appearing in complex scenes or difficulties caused by the project requirements in order to establish those functions or tools useful for resolving them. This approach includes the improvement of some common photogrammetric flight operations and the proposal of new flight schemas for some scenarios and practical cases. Some examples of these specific schemas are the combined flight (which includes characteristics of a classical block flight and a corridor flight in only one mission) and a polygon extrusion mode to be used for buildings and vertical objects, according to the International Committee of Architectural Photogrammetry (CIPA) recommendations. In all cases, it is very important to allow a detailed control of the flight and image parameters, such as the ground sample distance (GSD) variation, scale, footprints, coverage, and overlaps, according to the Digital Elevation Models (DEMs) available for the area. In addition, the application could be useful for quality control of other flights (or flight planning). All these new functions and improvements have been implemented in a software developed in order to make RPAS photogrammetric mission planning easier. The inclusion of new flight typologies supposes a novelty with respect to other available applications. The application has been tested using several cases including different types of flights. The results obtained in the quality parameters of flights (coverage and GSD variation) have demonstrated the viability of our new approach in supporting other photogrammetric procedures.

APA, Harvard, Vancouver, ISO, and other styles

26

Wang, Kang, Yuan Xue, Hongfeng Tian, Miaosen Wang, and Xiaolong Wang. "The Impact of Icing on the Airfoil on the Lift-Drag Characteristics and Maneuverability Characteristics." Mathematical Problems in Engineering 2021 (June 12, 2021): 1–16. http://dx.doi.org/10.1155/2021/5568740.

Full text

Abstract:

Icing has now become an important factor endangering flight safety. This paper takes the icing data of the NACA 23012 airfoil as an example, establishes an icing influence model for real-time simulation based on icing time and aircraft angle of attack, and analyzes the influence of different icing geometry on aircraft characteristics. The two-dimensional interpolation method is used to improve the model of the aircraft’s stall area, which is mainly divided into the correction of the lift-drag coefficient linear area and the stall area and the correction of the aircraft stability derivative and the control derivative. The aerodynamic equation of the airplane after icing is established, and the modal analysis of the airplane under different icing conditions is completed through the linearization of the flight equation. The closed-loop simulation system of the altitude holding mode and roll attitude holding mode is used to calculate and analyze the flight quality changes of the aircraft after the wing surface is frozen. The analysis results show that, under icing conditions, in the range of small angles of attack, icing has no obvious influence on the aircraft mode. As the degree of icing increases, the throttle skewness and the negative deflection angle of the airplane’s level flight requirements continue to increase. The case of icing flight in altitude hold and roll hold modes shows that flying in the autopilot mode under severe icing conditions is very dangerous and is prone to cause the aircraft to stall.

APA, Harvard, Vancouver, ISO, and other styles

27

Lauk, Peep, and Karl-Eerik Unt. "INFLUENCE OF MINIFLAPS ON SAILPLANE FLIGHT CHARACTERISTICS." Aviation 19, no. 3 (November 13, 2015): 105–11. http://dx.doi.org/10.3846/16487788.2015.1104793.

Full text

Abstract:

The effect of miniflaps for increasing the L/D ratio and the lift coefficient has been studied on airliners as well as on UAV-s and wind turbines. For sailplanes the lift when Cl > 1.0 is of main interest. As the maximum wing loading of racing sailplanes reaches 60–62 kg/m2, it is necessary to achieve a high Cl max (1.7–1.8) in thermals. In this case the decrease in TAS caused by a high Cl max even compensates for the drop of the L/D ratio to a certain extent, as the climb speed will increase when the spiral flight radius diminishes in thermals. To bring the L/D to Cl > 1.0, a 2% chord miniflap at a 30° deflection angle was attached to the trailing edge of a Jantar-Standard 3 type sailplane wing (airfoil NN-8). In flight tests it was found that the miniflap increased the sailplane‘s Cl max to 1.35–1.66, i.e. by 23% (Re 1.0–0.92×106). At the same time the L/D ratio Cl increased by over 1.0. Especially good L/D improvement was noted with Cl at 1.13–1.19. In thermal Cl of 1.57–1.65 the roll control was good. At lower Cl < 1.0 values, the miniflap reduced the L/D ratio in comparison with a normal configuration.

APA, Harvard, Vancouver, ISO, and other styles

28

Weilmuenster, K. James, and Peter A. Gnoffo. "Aeroassisted Flight Experiment aerodynamic characteristics at flightconditions." Journal of Spacecraft and Rockets 27, no. 6 (November 1990): 684–86. http://dx.doi.org/10.2514/3.26200.

Full text

APA, Harvard, Vancouver, ISO, and other styles

29

SUDO, Seiichi, Hideya NISHIYAMA, Toshiaki IKOHAGI, and Kazunari KATAGIRI. "On the Frequency Characteristics of Flight Feathers." Proceedings of the Bioengineering Conference Annual Meeting of BED/JSME 2001.13 (2001): 240–41. http://dx.doi.org/10.1299/jsmebio.2001.13.240.

Full text

APA, Harvard, Vancouver, ISO, and other styles

30

HISHIKAWA, Genkiro, and Osamu KOBAYASHI. "3201 Flight Characteristics in the Backside Region." Proceedings of the Transportation and Logistics Conference 2008.17 (2008): 309–12. http://dx.doi.org/10.1299/jsmetld.2008.17.309.

Full text

APA, Harvard, Vancouver, ISO, and other styles

31

Tian, Fang-Bao, Sheila Tobing, John Young, Joseph C. S. Lai, Simon M. Walker, Graham K. Taylor, and Adrian L. R. Thomas. "Aerodynamic characteristics of hoverflies during hovering flight." Computers & Fluids 183 (April 2019): 75–83. http://dx.doi.org/10.1016/j.compfluid.2018.10.008.

Full text

APA, Harvard, Vancouver, ISO, and other styles

32

Nalepa, C. A., L. R. Miller, and M. Lenz. "Flight characteristics of Mastotermes darwiniensis (Isoptera, Mastotermitidae)." Insectes Sociaux 48, no. 2 (June 2001): 144–48. http://dx.doi.org/10.1007/pl00001757.

Full text

APA, Harvard, Vancouver, ISO, and other styles

33

Pham, Duy Long, Yasuto Ito, Ryuichi Okada, Hidetoshi Ikeno, and Michimasa Yamasaki. "Females invest more energy in flight: flight characteristics of Platypus quercivorus (Murayama) revealed by a flight mill." Journal of Forest Research 26, no. 2 (January 19, 2021): 143–51. http://dx.doi.org/10.1080/13416979.2021.1872761.

Full text

APA, Harvard, Vancouver, ISO, and other styles

34

Chiang, Kwo-Tsao, Hsin Chu, Min-Yu Tu, You-Jin Lin, Sing-Hong Lin, Yu-Hsin Wen, and Chung-Yu Lai. "Analysis of Altitude Hypoxia Training and In-Flight Hypoxia Events among the Helicopter Aircrews." International Journal of Environmental Research and Public Health 18, no. 16 (August 9, 2021): 8405. http://dx.doi.org/10.3390/ijerph18168405.

Full text

Abstract:

All aircrews are required to undertake the altitude hypoxia training and be familiarized with the hypobaric effect on their physiological regulation. Due to the characteristics of the helicopter aircrafts, few researches have reported in-flight hypoxia events among the helicopter aircrews. The main goal of this study was designed to compare the hypoxia symptoms of helicopter aircrews between the altitude hypoxia training and during flight. We developed a questionnaire to collect the details of chamber flights and in-flight hypoxia events in 2019. All data were managed by the SPSS software and two-tailed 0.05 alpha level was considered as a significant level. Of the 213 study participants, there were eight (3.8%) cases that experienced hypoxia symptoms during the flight. The top five symptoms that appeared both in the last and current altitude hypoxia trainings were visual impairment (20.7%), difficulty concentrating (12.7%), tiredness (12.2%), cognitive impairment (8.0%), and air hunger (5.2%). Meanwhile, the frequency of those symptoms above was not significantly different from the last or current training compared with those in-flight hypoxia events. The survey unveiled a series of consistency correlations of hypoxia symptoms between the chamber flights and in-flight environment for the helicopter aircrew group.

APA, Harvard, Vancouver, ISO, and other styles

35

Falk, Martin Thomas, and Eva Hagsten. "Characteristics of Middle European Holiday Highfliers." Urban Planning 6, no. 2 (June 9, 2021): 246–56. http://dx.doi.org/10.17645/up.v6i2.3972.

Full text

Abstract:

This article estimates a count-data model on the flight behaviour of Austrian holiday-makers based on information from a large representative quarterly survey spanning the years 2014–2016. On average, the number of holiday flights ranges between 0.6 and 1.2 per year for residents in the least populated region and the capital, respectively. Results of the estimations reveal that the number of holiday flights is highest for persons with tertiary degrees, of a young age (16–24 years) and capital city residents, while it is lowest for individuals with children and large households. Residents of the capital city fly 78 percent more often in a given quarter than those living in Carinthia, the most rural region. The Oaxaca-Blinder decomposition analysis reveals that the difference is rather related to location than to variations in individual characteristics. Socio-demographic aspects such as age, household size and travelling with children are of no relevance for the holiday flying behaviour of capital residents.

APA, Harvard, Vancouver, ISO, and other styles

36

Wang, Yalong, Wenqiang Yin, and Shenjun Qi. "Dynamic Characteristics Analysis and Flight Test of Free Flight Model with Four Propellers." IOP Conference Series: Materials Science and Engineering 887 (July 10, 2020): 012035. http://dx.doi.org/10.1088/1757-899x/887/1/012035.

Full text

APA, Harvard, Vancouver, ISO, and other styles

37

SUN, Ying, Mikhail Yu KUPRIKOV, and Elena L. KUZNETSOVA. "Effect of flight range on the dimension of the main aircraft." INCAS BULLETIN 12, S (July 28, 2020): 201–9. http://dx.doi.org/10.13111/2066-8201.2020.12.s.19.

Full text

Abstract:

The purpose of the article is to analyze the characteristics of aircraft, including aircraft of the Boeing and Airbus families, as well as to highlight the factors affecting the flight range depending on the dimension of the main aircraft. The possibilities of competition with Boeing and Airbus were considered and options for solving this problem were proposed. Formulas were used to identify the economic excellence of the aircraft and an analysis was made of the distribution of flights and major airports around the globe. A graphical model for the search for the rational appearance of the aerodynamic balancing scheme of long-range aircraft was presented. Among them were Boeing 747-400, Airbus A380-800 and VHI-5, the characteristics of which correspond to three specific zones of flight range. Conclusions were drawn about the dependence of the mass of the aircraft on the flight range, a scheme was determined according to which the dimension is the smallest, and a relationship was established between the duration of the flight and the fatigue of passengers and their impact on the requirements for comfort and ergonomics of a passenger seat depending on the duration of the flight.

APA, Harvard, Vancouver, ISO, and other styles

38

Berketova, L., and R. Iginova. "Nutrition on Aircrafts: a Menu Analysis (Part 1)." Bulletin of Science and Practice 6, no. 2 (February 15, 2020): 170–81. http://dx.doi.org/10.33619/2414-2948/51/17.

Full text

Abstract:

The organization of passenger service for air transport consists not only in the transportation of passengers to their destination, but also in the provision of various types of food, which can include hot meals according to the free choice menu or complete rations on board the aircraft, desserts, drinks. The range of dishes depends on the budget of the airline, season, flight duration, class of service, departure time, principles of healthy eating, national characteristics, specific tastes and age of the passenger. In this paper, the menu of the company Aeroflot — Russian Airlines is considered. Food in Aeroflot airplanes is divided into two cycles. Depending on the direction and duration of the flight, a choice of two dishes is provided: cold or hot breakfast, hot or cold lunch, snacks and drinks. The menu of this airline is updated every six weeks. Economy class menu: depending on the direction, departure time and duration of the flight, it contains breakfast, lunch or snacks. A selection of hot and cold drinks is also provided depending on the duration and direction of the flight. Flights lasting up to 3 hours of flight offer passengers breakfast or lunch or dinner, soft and hot drinks. On flights lasting from 3 to 6 hours of flight, the menu includes appetizer, main course, dessert, soft and hot drinks. There is also the option of ordering special meals in the Economy class on flights over 3 hours. On flights over 12 hours of flight to Los Angeles, Miami, Havana, passengers will be offered an additional diet — a sandwich and fruits. The Comfort class menu offers passengers a welcome drink and a menu card is provided. During the flight in the Comfort class, two meals are provided for flights lasting more than 6 hours. The menu of this class is presented for 14 directions (from Moscow to Bangkok, Phuket, Beijing, Hong Kong, Dubai, Los Angeles, New York, Vladivostok, Khabarovsk, Petropavlovsk–Kamchatsky, Seoul, Shanghai, Tel Aviv, Yuzhno–Sakhalinsk and back). The paper presents a menu with the calculation of nutritional value and calorie content.

APA, Harvard, Vancouver, ISO, and other styles

39

Zhang, Dong, Yong Chen, Xinmin Dong, Zongcheng Liu, and Yang Zhou. "Numerical Aerodynamic Characteristics Analysis of the Close Formation Flight." Mathematical Problems in Engineering 2018 (August 29, 2018): 1–13. http://dx.doi.org/10.1155/2018/3136519.

Full text

Abstract:

The aerodynamic characteristics of the close formation flight are numerically analyzed to facilitate a greater understanding of the vortex effects between UAVs and technically support the application of close formation flight for UAVs. The aerodynamic characteristics of a single UAV are calculated, the results of which are used as the reference to the variation of aerodynamic values in the comparison with close formation flight. The vortex effects of the leading UAV on the aerodynamic characteristics of the trailing UAV in the two UAV close formation flight are analyzed. The position where the trailing UAV obtains the maximum lift-to-drag ratio is defined as the optimal position. Based on the optimal position, three different types of three UAV formations are designed to explore the preliminary application of the aerodynamic benefits in the close formation flight for multiple UAVs. It is observed that the incremental aerodynamic forces and moments of the trailing UAV vary with the lateral and vertical spacing between the two UAVs, and the trailing UAV can obtain significant aerodynamic improvement if positioned at optimal position behind the leading UAV while in close formation flight. It is also proved that the aerodynamic characteristics of the close formation for three UAVs can be improved when the formation is designed based on the optimal position, and this will increase the range and endurance of the UAVs in operational application.

APA, Harvard, Vancouver, ISO, and other styles

40

Figat, Marcin, and Agnieszka Kwiek. "Aerodynamic optimisation of the rocket plane in subsonic and supersonic flight conditions." Proceedings of the Institution of Mechanical Engineers, Part G: Journal of Aerospace Engineering 231, no. 12 (August 14, 2017): 2266–81. http://dx.doi.org/10.1177/0954410017723672.

Full text

Abstract:

This paper presents the results of a numerical study of the aerodynamic shape of the Rocket Plane LEX. The Rocket Plane is a main part of the Modular Airplane System – MAS; a special vehicle devoted to suborbital tourist flights. The Rocket Plane was designed for subsonic and supersonic flight conditions. Therefore, the impact of the Mach number should be considered during the aerodynamic design of the Rocket Plane. The main goal of the investigation was to determine the sensitivity of the Rocket Plane aerodynamic characteristics to the Mach number during the optimisation of the LEX geometry. The paper includes results of the optimisation process for Mach number from the range Ma = 0.5 to Ma = 2.5. These results reveal that the aerodynamic characteristics of models optimised for the subsonic and transonic regime of Mach numbers (up to Ma = 1) were also improved for the supersonic speed regime. However, in the case of models optimised for the supersonic flight regime the aerodynamic characteristics in subsonic flight regime, are inferior compared to the model before the optimisation process.

APA, Harvard, Vancouver, ISO, and other styles

41

Asakura, T., and Y. Takagi. "Case study: Effect of acoustic characteristics of interior aircraft noise on pilot." Noise Control Engineering Journal 68, no. 2 (March 20, 2020): 125–36. http://dx.doi.org/10.3397/1/376811.

Full text

Abstract:

The influence of acoustic characteristics of in-flight noise on airplane operations and sound impression has been investigated through objective and subjective measure including the flight simulation. The authors verified the influence of the noise conditions including seven conditions, in which the sound pressure levels and frequency characteristics of them were parametrically changed, on the airplane operations using shortterm flight simulation. Resultantly, the change of the sound pressure levels of the in-flight noise did not greatly affect the operation accuracy although clearly affected the subjective impressions. On the other hand, it has been suggested that the change of the frequency characteristics of in-flight noise affected not only the subjective impressions but also the operation accuracy.

APA, Harvard, Vancouver, ISO, and other styles

42

Stickland, M. T., and T. J. Scanlon. "A novel method for the provision of flight experience and flight testing for undergraduate aeronautical engineers at the University of Strathclyde." Aeronautical Journal 108, no. 1084 (June 2004): 315–18. http://dx.doi.org/10.1017/s0001924000000178.

Full text

Abstract:

Abstract The Department of Mechanical Engineering at the University of Strathclyde has developed a novel flight experience/test course for undergraduate Aeronautical Engineers. In common with similar courses at undergraduate level the course contains practical instruction in how an aircraft is flown, an analysis of its stall characteristics and an assessment of an aircraft’s performance and stability. However, uniquely, the Strathclyde course consists of dual instructional flights in two seat gliders. This paper contains a detailed description of the flight experience/test course developed at Strathclyde and its incorporation into the undergraduate curriculum. A critical analysis of its delivery is also presented.

APA, Harvard, Vancouver, ISO, and other styles

43

Spathopoulos, V. M. "An investigation of the flight dynamic characteristics of gyroplanes by use of flight tests." Aeronautical Journal 108, no. 1088 (October 2004): 531–35. http://dx.doi.org/10.1017/s0001924000000361.

Full text

Abstract:

AbstractAn analysis is presented both of flight test and simulation data obtained from a gyroplane aircraft. This class of rotary-wing vehicle has found limited application in areas other than recreational flying, however the accident rate has been such that it has prompted the study of the configuration’s stability and control characteristics. It is concluded that the flight dynamic response of the gyroplane examined is dominated by a fast, non-stable mode, affecting all states and thus increasing pilot workload. Simulation results indicate that the position of the centre of gravity significantly influences the stability of this mode.

APA, Harvard, Vancouver, ISO, and other styles

44

SPAAR, RETO. "Flight strategies of migrating raptors; a comparative study of interspecific variation in flight characteristics." Ibis 139, no. 3 (July 1997): 523–35. http://dx.doi.org/10.1111/j.1474-919x.1997.tb04669.x.

Full text

APA, Harvard, Vancouver, ISO, and other styles

45

vanZanten, M. C., B. Stevens, G. Vali, and D. H. Lenschow. "Observations of Drizzle in Nocturnal Marine Stratocumulus." Journal of the Atmospheric Sciences 62, no. 1 (January 1, 2005): 88–106. http://dx.doi.org/10.1175/jas-3355.1.

Full text

Abstract:

Abstract In situ and radar data from the second field study of the Dynamics and Chemistry of Marine Stratocumulus (DYCOMS-II) have been used to study drizzle in stratocumulus. Measurements indicate that drizzle is prevalent. During five of seven analyzed flights precipitation was evident at the surface, and on roughly a third of the flights mean surface rates approached or exceeded 0.5 mm day−1. Additional analysis of the structure and variability of drizzle indicates that the macroscopic (flight averaged) mean drizzle rates at cloud base scale with H3/N where H is the flight-averaged cloud depth and N the flight-averaged cloud droplet number concentration. To a lesser extent flight-to-flight variability in the mean drizzle rate also scales well with differences in the 11- and 4-μm brightness temperatures, and the cloud-top effective radius. The structure of stratocumulus boundary layers with precipitation reaching the surface is also investigated, and a general picture emerges of large flight-averaged drizzle rates being manifested primarily through the emergence of intense pockets of precipitation. The characteristics of the drizzle spectrum in precipitating versus nonprecipitating regions of a particular cloud layer were mostly distinguished by the number of drizzle drops present, rather than a change in size of the median drizzle drop, or the breadth of the drizzle spectrum.

APA, Harvard, Vancouver, ISO, and other styles

46

Battipede, Manuela. "Boomerang Flight Mechanics: Unsteady Effects on Motion Characteristics." Journal of Aircraft 36, no. 4 (July 1999): 689–96. http://dx.doi.org/10.2514/2.2492.

Full text

APA, Harvard, Vancouver, ISO, and other styles

47

Janković, Aleksandar M., Boško P. Rašuo, and Čedomir Lj Kostić. "Aerodynamic characteristics and load of aerostats during flight." Tehnika 70, no. 6 (2015): 967–74. http://dx.doi.org/10.5937/tehnika1506967j.

Full text

APA, Harvard, Vancouver, ISO, and other styles

48

YASUDA, Kunio. "Flight- and Aerodynamic Characteristics of a Flying Disc." Journal of the Japan Society for Aeronautical and Space Sciences 47, no. 547 (1999): 314–20. http://dx.doi.org/10.2322/jjsass.47.314.

Full text

APA, Harvard, Vancouver, ISO, and other styles

49

Osborn, Robert G., Charles D. Dieter, Kenneth F. Higgins, and Robert E. Usgaard. "Bird Flight Characteristics Near Wind Turbines in Minnesota." American Midland Naturalist 139, no. 1 (January 1998): 29–38. http://dx.doi.org/10.1674/0003-0031(1998)139[0029:bfcnwt]2.0.co;2.

Full text

APA, Harvard, Vancouver, ISO, and other styles

50

Knuth, Kevin H., Robert M. Powell, and Peter A. Reali. "Estimating Flight Characteristics of Anomalous Unidentified Aerial Vehicles." Entropy 21, no. 10 (September 25, 2019): 939. http://dx.doi.org/10.3390/e21100939.

Full text

Abstract:

Several Unidentified Aerial Phenomena (UAP) encountered by military, commercial, and civilian aircraft have been reported to be structured craft that exhibit `impossible’ flight characteristics. We consider a handful of well-documented encounters, including the 2004 encounters with the Nimitz Carrier Group off the coast of California, and estimate lower bounds on the accelerations exhibited by the craft during the observed maneuvers. Estimated accelerations range from almost 100 g to 1000s of gs with no observed air disturbance, no sonic booms, and no evidence of excessive heat commensurate with even the minimal estimated energies. In accordance with observations, the estimated parameters describing the behavior of these craft are both anomalous and surprising. The extreme estimated flight characteristics reveal that these observations are either fabricated or seriously in error, or that these craft exhibit technology far more advanced than any known craft on Earth. In many cases, the number and quality of witnesses, the variety of roles they played in the encounters, and the equipment used to track and record the craft favor the latter hypothesis that these are indeed technologically advanced craft. The observed flight characteristics of these craft are consistent with the flight characteristics required for interstellar travel, i.e., if these observed accelerations were sustainable in space, then these craft could easily reach relativistic speeds within a matter of minutes to hours and cover interstellar distances in a matter of days to weeks, proper time.

APA, Harvard, Vancouver, ISO, and other styles

Journal articles on the topic 'Flight characteristics'

Create a spot-on reference in APA, MLA, Chicago, Harvard, and other styles