Relevant bibliographies by topics / Helicopters

Academic literature on the topic 'Helicopters'

Author: Grafiati
Published: 4 June 2021
Last updated: 29 July 2024

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

Select a source type:

Contents

Consult the lists of relevant articles, books, theses, conference reports, and other scholarly sources on the topic 'Helicopters.'

Next to every source in the list of references, there is an 'Add to bibliography' button. Press on it, and we will generate automatically the bibliographic reference to the chosen work in the citation style you need: APA, MLA, Harvard, Chicago, Vancouver, etc.

You can also download the full text of the academic publication as pdf and read online its abstract whenever available in the metadata.

Journal articles on the topic "Helicopters"

1

Trethewey, Diane. "Development of an index for quick comparison of helicopter costs and benefits." International Journal of Wildland Fire 16, no. 4 (2007): 444. http://dx.doi.org/10.1071/wf06108.

Full text
Abstract:
A helicopter comparison index was developed to incorporate cost and benefit information for individual helicopters for large wildland fire suppression operations. The costs and benefits for individual helicopters are unique. Costs consist of daily availability and hourly flight rates. Benefits depend on the payload, which depends on the altitude and temperature of operation, weight of the helicopter, equipment on board, crew, and fuel. Because of the complexity of calculating payload, previous methods for deploying helicopters classified helicopters into three types according to their typical payload. The least expensive helicopter of the desired type was deployed. Because this classification system produces a broad range of benefits within each helicopter type, this method may not deploy the most efficient helicopter. The helicopter comparison index can be calculated at representative altitudes and temperatures before it is needed. As the work is done beforehand, the helicopters can be compared quickly when they are needed. The helicopter comparison index allows helicopters to be compared based on the efficiency of the individual helicopters rather than just their cost of operation. Evaluation of Type I helicopters shows that using the helicopter comparison index instead cost of operation has savings potential of 20 to 45 percent.
APA, Harvard, Vancouver, ISO, and other styles
2

Frey, Felix, Jakob Thiemeier, Constantin Öhrle, Manuel Keßler, and Ewald Krämer. "Aerodynamic Interactions on Airbus Helicopters' Compound Helicopter RACER in Cruise Flight." Journal of the American Helicopter Society 65, no. 4 (October 1, 2020): 1–14. http://dx.doi.org/10.4050/jahs.65.042001.

Full text
Abstract:
With the pursuit of extending the flight envelopes of helicopters toward higher cruise speed, helicopter manufacturers increasingly have come up with nonconventional configurations in recent years. Among these, Airbus Helicopters' RACER (Rapid And Cost-Efficient Rotorcraft) is a compound helicopter equipped with a boxwing and lateral pusher rotors. In combination with the main rotor, these additional components determine the aerodynamic characteristics of the helicopter. Thereby, depending on the flight conditions, their individual performance is influenced by a variety of interactions. As the understanding of these interactions is vital for the evaluation of the overall system, the respective mutual influence of main rotor, wings, and lateral rotors is analyzed in this paper for cruise flight. For this reason, high-fidelity coupled aerodynamic simulations are conducted not only for the full RACER configuration but also for reduced setups omitting individual components to isolate the effect of these components on the helicopter's aerodynamic performance.
APA, Harvard, Vancouver, ISO, and other styles
3

Szilvássy, László. "Why Does the Attack Helicopter Have More Survival Ability than the Armed Utility Helicopter?" Repüléstudományi Közlemények 34, no. 3 (2022): 167–80. http://dx.doi.org/10.32560/rk.2022.3.11.

Full text
Abstract:
The author highlights the difference between attack and armed utility helicopters and supports this with professional arguments. He also presents the most common weapon systems of combat helicopters. Points out that an armed transport helicopter or multipurpose helicopter cannot substitute attack helicopters at all.
APA, Harvard, Vancouver, ISO, and other styles
4

Krivolutsky, Yu V. "Optimization of types and quantity of the national helicopter park as a factor of customer’s cost reduction." Entrepreneur’s Guide 15, no. 1 (March 4, 2022): 80–83. http://dx.doi.org/10.24182/2073-9885-2022-15-1-80-83.

Full text
Abstract:
The article shows that the main cause, which restrains wide implementation of helicopters, is the incongruity of the current park of helicopters to the character and the high cost of the performing tasks. The solvation of the problem would be a saturation of the helicopter park by the new types of helicopters. The method of calculation of the possible reduction of exploitation expenses under optimization of helicopter types in accordance with market demand is offered. The optimization of types and quantity of helicopters park enables the customers to reduce their costs and widen the possibilities of helicopters exploitation in national economy.
APA, Harvard, Vancouver, ISO, and other styles
5

Televnyi, I. "CREATION OF MATHEMATICAL MODELS FOR PARAMETRIC IDENTIFICATION DURING TESTS TO DETERMINE THE FUEL CONSUMPTION OF THE HELICOPTER WITH EXHAUST- HEAT SHIELDS." Наукові праці Державного науково-дослідного інституту випробувань і сертифікації озброєння та військової техніки, no. 8 (June 29, 2021): 134–39. http://dx.doi.org/10.37701/dndivsovt.8.2021.14.

Full text
Abstract:
With the increasing effectiveness of guided missile weapons, the problem of protecting helicopters from these means of destruction is becoming increasingly important. To date, the issue of assessing the protection of helicopters in tests of helicopter equipment are insufficiently developed and require more careful consideration. Therefore, the research of the protection of helicopters equipped with an integrated protection system against guided missiles with infra-red target seeker devices and the impact of exhaust-heat shields on the values of flight characteristics of the helicopter is quite relevant. The article researches the influence of exhaust-heat shields on the flight technical characteristics of helicopters, their change during the installation of exhaust-heat shields. The estimation of the change in geometric, mass and center characteristics of helicopters by the calculation method is given and the method determining the characteristics of fuel consumption by the calculation and experimental method is given. The methodology and results of experimental researches of flight technical characteristics of the helicopter with the established exhaust-heat shield are described. The basic result of the research is the study of existing methods for determining the impact of exhaust-heat shields on the flight characteristics of helicopters. Methods of parametric identification for determination of fuel consumption are worked out and the analysis of flight technical characteristics of the helicopter is developed. The fuel consumption of the helicopter with exhaust-heat shield is defined. Integrated assessment of the effectiveness of protection of helicopters from guided missiles with infra-red targeting device can be directly used in practice in test systems for the protection of upgraded and the latest models of helicopters. According to the results of research, mathematical models for determining the fuel consumption of a helicopter with exhaust-heat shields have been developed.
APA, Harvard, Vancouver, ISO, and other styles
6

Češkovič, Marek, Martin Schrötter, Róbert Huňady, Pavol Kurdel, and Natália Gecejová. "Unwanted Supplementary Vibrations of Helicopter Radio Communication Systems." Aerospace 10, no. 7 (July 13, 2023): 632. http://dx.doi.org/10.3390/aerospace10070632.

Full text
Abstract:
A helicopter in flight can be considered an unstable dynamic system with many unwanted vibrations originating from multiple sources, such as the operation of the engines and individual components. These vibrations cause the degradation of the structural and functional components of a helicopter, thereby generally reducing the utility and technical efficiency of the aircraft. During the analysis of frequently recurring errors of medium-heavy helicopters, partial damage to antenna elements with vertical polarisation was detected. These damages provided the basis for the presented research, based on which supplementary vibrations caused by unwanted electromagnetic oscillations were revealed. These oscillations were detected in the process of communication between the helicopter crew and the ground ATC (air traffic control) station. This phenomenon’s existence and negative influence were confirmed via measurements and modal analysis, based on which an exact synergy between harmonic frequencies of the helicopter’s normal vibrations was discovered. The obtained results serve as a theoretical and practical basis for the future monitoring of this phenomenon, especially in the process of determining the “health status” of medium-heavy helicopters.
APA, Harvard, Vancouver, ISO, and other styles
7

Нерубасский, Вадим Владимирович. "РЫНОК И ПЕРСПЕКТИВЫ ЛЕГКИХ ВЕРТОЛЕТОВ С ГАЗОТУРБИННЫМИ ДВИГАТЕЛЯМИ." Aerospace technic and technology, no. 5 (August 29, 2020): 5–12. http://dx.doi.org/10.32620/aktt.2020.5.01.

Full text
Abstract:
In the introductory part of the article, it is provided brief information about the main activity of JSC “Element”- developer and manufacturer of electronic control systems for aircraft engines, in particular unit RDTs-450M for AI-450M helicopter turboshaft gas turbine engines, created by SE “Ivchenko-Progress”. JSC ”Element”, together with its partners - SE “Ivchenko-Progress” and JSC “Motor-Sich” – for more than 10 years involved in the modernization of Mi-2 light helicopter.In the next section is gave the classification of helicopters, as well as a segment of light helicopters with turbine engines. It is outlined the scope of light helicopters. It is noted that the segment of light helicopters with turbine engines – the most popular in the world market of civil helicopters and provides a forecast of the supply of these helicopters for the next 10 years.Lists the world's major developers and manufacturers of light helicopters, and the technical characteristics of 12 models of light helicopters with turbine engines are depicted. It is noted that most helicopter models are not entirely new developments and have been modernized over many years. The characteristic design features of light helicopters with turbine engines, especially the layout of plant and equipment are depicted. There is a trend of using one model of helicopter multiple engine types.Lists the world's major developers and manufacturers of engines for light helicopters, as well as the technical characteristics of the six models of gas turbine engines are depicted. The main structural and compositional features of gas-turbine engines of different manufacturers and types of a helicopter on which they installed are described. Separately, brief information about the Ukrainian gas-turbine engines: AI-450M and MS-500V. It is noted that all, without exception, mentioned in the article, engines are equipped with a digital single or dual-channel FADEC type control system with hydro-mechanical redundancy.Brief information about individual conceptual samples of rotary-wing technology introduced in recent years is given. The main directions of work in the field of helicopter engines are described.In conclusion, the Ukrainian helicopter and Aero-engine industry are in a difficult economic situation, but remain competitive and require assistance and the expansion of the market.
APA, Harvard, Vancouver, ISO, and other styles
8

Bisták, Andrej, and Zdenka Hulínová. "Construction of ropeways in Slovakia in terms of pre-construction design using helicopters (case study)." MATEC Web of Conferences 263 (2019): 01002. http://dx.doi.org/10.1051/matecconf/201926301002.

Full text
Abstract:
Ropeways usually provide access to locations inaccessible to other means of transport. Due to this fact, the construction of ropeways is extraordinarily taxing in terms of both, technology and logistics. The site location is often in terrain difficult to access, which often precludes deployment of common construction mechanisms in ropeway construction. In such case, it is advisable to deploy a transport mechanism independent of the terrain – a helicopter. Functioning as “flying cranes“, the helicopters have been used in construction industry in Slovakia for six decades now. Having amassed positive experience, even the “conventional“ construction industry of the time, especially its ropeway transport segment, started to use the benefits of helicopters, with helicopter deployment subsequently gaining ground and becoming the mainstream technological procedure. Ropeway construction can hardly be feasible without them even nowadays. Throughout the history of helicopter deployment in construction industry, a constant search of improving the efficiency of their work has been under way, necessitated by the helicopter’s sensitivitiy to weather conditions and work procedures alike. The paper presents an analysis of the factors affecting helicopter operation together with a proposed methodology of modeling their work in simulation models and the benefits of such approach.
APA, Harvard, Vancouver, ISO, and other styles
9

Yin, Ze Yong, Bi Bo Fu, Tong Bo Xue, Yong Hong Wang, and Jie Gao. "Development of Helicopter Power Transmission System Technology." Applied Mechanics and Materials 86 (August 2011): 1–17. http://dx.doi.org/10.4028/www.scientific.net/amm.86.1.

Full text
Abstract:
The helicopter power transmission system technology is the key technical area for improving the helicopter performance, reducing the noise/vibration level of helicopters and decreasing the cost of life cycle of helicopters. In this paper, the technical characteristics of the helicopter power transmission system are introduced first. Then, the development history and trend of the transmission configuration, the component and the design and analysis technique of the transmission system are described. The advanced material and process technology applied in the helicopter power transmission system are also described. Finally, the power transmission system technology used in the high speed helicopters is briefly presented.
APA, Harvard, Vancouver, ISO, and other styles
10

Huliak, O., L. Kinderknekht, V. Minasov, M. Smolyanyi, and V. Klimenko. "ACTIONS OF THE ARMY AVIATION DURING THE RAID BY THE AIR ASSAULT FORCES’ UNITS." Collection of scientific works of Odesa Military Academy 2, no. 14 (January 25, 2021): 209–13. http://dx.doi.org/10.37129/2313-7509.2020.14.2.209-213.

Full text
Abstract:
The article analyzes the foreign and domestic experience of combat use of Army Aviation Helicopters (AA) in modern wars and local conflicts when conducting raid operations by the units of Air Assault (Airmobile) forces, as well as the experience of transfer of the Air Assault Forces by helicopters in time of action. During a raid, air assault battalion can use combat helicopters. In this case, helicopter ambushes are most expedient to use in the ways of raising the nearest enemy reserves and in case of the enemy's mobile objects to strike suddenly, using various tactical techniques. The use of ambushes will be most effective in the area, which provides the secretive action of helicopters and the selection of enough quantity of fields. The use of Army aviation allows the airborne assault units to be transferred during a raid. Helicopters must fly at extremely low altitudes using terrain masking, individual and group means of EW. Exit of helicopters at the landing field of the air assault force is carried out suddenly and accurately in relation to place and time. AA units are widely used to evacuate units. Transport and combat helicopters provide for the admission on board and transportation of personnel, weapons, documents; conducting intelligence. At the same time combat helicopters perform the task of destroying air defense on the flight route; concealment of AA combat order from possible attacks by enemy helicopters in the air; landing and take-off of transport and combat helicopter. Commanders of air assault units must be aware of the tactics of combat, transport-combat and transport helicopters and their tactical characteristics, which will significantly improve the effectiveness of the raid and be able to apply it during the raid. Keywords: Army aviation helicopters, combat control group, advanced aircraft commander, Air Assault Forces, helicopter units.
APA, Harvard, Vancouver, ISO, and other styles
More sources

Dissertations / Theses on the topic "Helicopters"

1

Peitso, Loren E. "Visual field requirements for precision nap-of-the-earth helicopter flight." Thesis, Monterey, Calif. : Springfield, Va. : Naval Postgraduate School ; Available from National Technical Information Service, 2002. http://library.nps.navy.mil/uhtbin/hyperion-image/02sep%5FPeitso.pdf.

Full text
Abstract:
Thesis (M.S. in Modeling, Virtual Environments and Simulation)--Naval Postgraduate School, September 2002.
Thesis advisor(s): Rudolph P. Darken, Joe Sullivan. Includes bibliographical references (p. 65-66). Also available online.
APA, Harvard, Vancouver, ISO, and other styles
2

Perkins, Keith M. "Implementing realistic helicopter physics in 3D game environments." Thesis, Monterey, Calif. : Springfield, Va. : Naval Postgraduate School ; Available from National Technical Information Service, 2002. http://library.nps.navy.mil/uhtbin/hyperion-image/02sep%5FPerkins.pdf.

Full text
Abstract:
Thesis (M.S. in Modeling, Virtual Environments and Simulations)--Naval Postgraduate School, September 2002.
Thesis advisor(s). Includes bibliographical references (p. 79-80). Also available online.
APA, Harvard, Vancouver, ISO, and other styles
3

Cook, Jeffrey S. "Analysis of consolidation of intermediate level maintenance for Atlantic Fleet T700-GE-401 engines." Thesis, Monterey, Calif. : Naval Postgraduate School, 1992. http://handle.dtic.mil/100.2/ADA257754.

Full text
APA, Harvard, Vancouver, ISO, and other styles
4

Ference, Edward W. "Case study of the development of the Apache attack helicopter (AH-64)." Thesis, Monterey, Calif. : Springfield, Va. : Naval Postgraduate School ; Available from National Technical Information Service, 2002. http://library.nps.navy.mil/uhtbin/hyperion-image/02Dec%5FFerence.pdf.

Full text
Abstract:
Thesis (M.S. in Program Management)--Naval Postgraduate School, December 2002.
Thesis advisor(s): Michael W. Boudreau, Richard G. Rhoades. Includes bibliographical references (p. 63-65). Also available online.
APA, Harvard, Vancouver, ISO, and other styles
5

Howard, Christopher B. Bradley Walter Lee. "Fatigue methodology for analysis of helicopter dynamic components." Waco, Tex. : Baylor University, 2008. http://hdl.handle.net/2104/5188.

Full text
APA, Harvard, Vancouver, ISO, and other styles
6

Ozturk, Dogan. "Development of a Myklestad's rotor blade dynamic analysis code for application to JANRAD." Thesis, Monterey, Calif. : Springfield, Va. : Naval Postgraduate School ; Available from National Technical Information Service, 2002. http://library.nps.navy.mil/uhtbin/hyperion-image/02sep%5FOzturk.pdf.

Full text
Abstract:
Thesis (M.S. in Aeronautical Engineering)--Naval Postgraduate School, September 2002.
Thesis advisor(s): E. Roberts Wood, Mark A. Couch. Includes bibliographical references (p. 213-214). Also available online.
APA, Harvard, Vancouver, ISO, and other styles
7

Van, Riper Steven G. "Investigation of increased forward flight velocities of helicopters using second harmonic control and reverse velocity rotor concept." Thesis, Monterey, Calif. : Springfield, Va. : Naval Postgraduate School ; Available from National Technical Information Service, 2003. http://library.nps.navy.mil/uhtbin/hyperion-image/03Dec%5FVanRiper.pdf.

Full text
Abstract:
Thesis (M.S. in Aeronautical Engineering)--Naval Postgraduate School, December 2003.
Thesis advisor(s): E. Roberts Wood, Raymond Shreeve. Includes bibliographical references (p. 145-146). Also available online.
APA, Harvard, Vancouver, ISO, and other styles
8

Prichard, Devon S. "Development of a full potential solver for rotor aerodynamics analysis." Diss., Georgia Institute of Technology, 1990. http://hdl.handle.net/1853/12033.

Full text
APA, Harvard, Vancouver, ISO, and other styles
9

Schaefer, Carl George. "Enhanced energy maneuverability for attack helicopters using continuous, variable rotor speed control." Master's thesis, This resource online, 1990. http://scholar.lib.vt.edu/theses/available/etd-03302010-020156/.

Full text
APA, Harvard, Vancouver, ISO, and other styles
10

Wasikowski, Mark E. "An investigation of helicopter individual blade control using optimal output feedback." Diss., Georgia Institute of Technology, 1989. http://hdl.handle.net/1853/12387.

Full text
APA, Harvard, Vancouver, ISO, and other styles
More sources

Books on the topic "Helicopters"

1

Liberatore, E. K. Helicopters before helicopters. Malabar, Fla: Krieger Publishing, 1998.

Find full text
APA, Harvard, Vancouver, ISO, and other styles
2

David, Baker. Helicopters. Vero Beach, FL: Rourke Enterprises, 1987.

Find full text
APA, Harvard, Vancouver, ISO, and other styles
3

Wolf, Jill. Helicopters. Yellow Springs, OH: Antioch, 1991.

Find full text
APA, Harvard, Vancouver, ISO, and other styles
4

Graham, Ian. Helicopters. New York: Gloucester Press, 1989.

Find full text
APA, Harvard, Vancouver, ISO, and other styles
5

Colson, Rob. Helicopters. London: Wayland, 2014.

Find full text
APA, Harvard, Vancouver, ISO, and other styles
6

Messenger, Charles. Helicopters. New York: F. Watts, 1985.

Find full text
APA, Harvard, Vancouver, ISO, and other styles
7

Bodden, Valerie. Helicopters. Mankato, MN: Creative Education, 2012.

Find full text
APA, Harvard, Vancouver, ISO, and other styles
8

Cooke, Tim. Helicopters. Mankato, Minn: Smart Apple Media, 2013.

Find full text
APA, Harvard, Vancouver, ISO, and other styles
9

Rickard, Graham. Helicopters. New York: Bookwright Press, 1987.

Find full text
APA, Harvard, Vancouver, ISO, and other styles
10

Stille, Darlene R. Helicopters. New York: Children's Press, 1997.

Find full text
APA, Harvard, Vancouver, ISO, and other styles
More sources

Book chapters on the topic "Helicopters"

1

Roy, John Scott. "Helicopters." In Birddog, 226–27. Dordrecht: Springer Netherlands, 1995. http://dx.doi.org/10.1007/978-94-011-0535-4_20.

Full text
APA, Harvard, Vancouver, ISO, and other styles
2

Nixon, John. "Helicopters." In Modern English for Aeronautics and Space Technology, 69–81. München: Carl Hanser Verlag GmbH & Co. KG, 2011. http://dx.doi.org/10.3139/9783446428348.006.

Full text
APA, Harvard, Vancouver, ISO, and other styles
3

Nixon, M. A., and Joseph Michaels. "Helicopters." In Modern English for Aeronautics and Space Technology, 77–91. 2nd ed. München: Carl Hanser Verlag GmbH & Co. KG, 2021. http://dx.doi.org/10.3139/9783446470118.006.

Full text
APA, Harvard, Vancouver, ISO, and other styles
4

Nixon, John D., and Joseph Michaels. "Helicopters." In Modern English for Aeronautics and Space Technology, 77–91. München, Germany: Carl Hanser Verlag GmbH & Co. KG, 2021. http://dx.doi.org/10.1007/978-3-446-47011-8_6.

Full text
APA, Harvard, Vancouver, ISO, and other styles
5

Fahimi, Farbod. "Autonomous Helicopters." In Autonomous Robots, 1–55. Boston, MA: Springer US, 2008. http://dx.doi.org/10.1007/978-0-387-09538-7_8.

Full text
APA, Harvard, Vancouver, ISO, and other styles
6

Remuß, Volker, Carsten Deeg, Marek Musial, Günter Hommel, Manuel Béjar, Federico Cuesta, and Aníbal Ollero. "Autonomous Helicopters." In Springer Tracts in Advanced Robotics, 111–46. Berlin, Heidelberg: Springer Berlin Heidelberg, 2007. http://dx.doi.org/10.1007/978-3-540-73958-6_5.

Full text
APA, Harvard, Vancouver, ISO, and other styles
7

Johnson, Malcolm. "GBR Helicopters." In Regional Businesses in a Changing Global Economy, 113–17. London: Routledge, 2022. http://dx.doi.org/10.4324/9781003256717-9.

Full text
APA, Harvard, Vancouver, ISO, and other styles
8

Chapuis, J., C. Eck, M. Kottmann, M. Sanvido, and O. Tanner. "Control of Helicopters." In Control of Complex Systems, 359–92. London: Springer London, 2001. http://dx.doi.org/10.1007/978-1-4471-0349-3_16.

Full text
APA, Harvard, Vancouver, ISO, and other styles
9

Freedman, Lawrence. "Westland and Helicopters." In The Politics of British Defence 1979–98, 175–202. London: Palgrave Macmillan UK, 1987. http://dx.doi.org/10.1007/978-1-349-14957-5_12.

Full text
APA, Harvard, Vancouver, ISO, and other styles
10

El-Sayed, Ahmed F. "Evolution of Helicopters." In History and Evolution of Aircraft, 514–34. Boca Raton: CRC Press, 2024. http://dx.doi.org/10.1201/9781003450115-13.

Full text
APA, Harvard, Vancouver, ISO, and other styles

Conference papers on the topic "Helicopters"

1

Kumar, Anil, and Pinhas Ben-Tzvi. "An Inertial Sensor to Measure Wind Turbulence With RC Helicopters." In ASME 2017 Dynamic Systems and Control Conference. American Society of Mechanical Engineers, 2017. http://dx.doi.org/10.1115/dscc2017-5354.

Full text
Abstract:
This paper presents a wireless sensor system developed to use RC helicopter dynamics to measure wind turbulence. Wind turbulence is a safety concern for naval helicopter operations due to typical scarcity of landing/takeoff area on naval vessels. Wind turbulence affects the dynamics of helicopters by creating uneven thrust on the rotor blades. The proposed telemetry system, when retrofitted on an RC helicopter, extracts these external disturbances in the helicopter’s dynamics and maps the wind conditions. This study focuses on learning the helicopter’s dynamics in controlled wind conditions using machine learning algorithms. The presented telemetry system uses sensors such as an Inertial Measurement Unit (IMU), optical trackers, and GPS sensors to measure the dynamics of the flying RC helicopter. The system also measures the pilot’s radio inputs to account for pilot inputs in the helicopter’s dynamics. The telemetry system is trained and tested in a large indoor facility where turbulent wind conditions were created artificially using large wind circulation fans.
APA, Harvard, Vancouver, ISO, and other styles
2

Frey, Felix, Jakob Thiemeier, Constantin Öhrle, Manuel Keßler, and Ewald Krämer. "Aerodynamic Interactions on Airbus Helicopters' Compound Helicopter RACER in Cruise Flight." In Vertical Flight Society 75th Annual Forum & Technology Display. The Vertical Flight Society, 2019. http://dx.doi.org/10.4050/f-0075-2019-14505.

Full text
Abstract:
With the pursuit of extending the flight envelopes of helicopters towards higher cruise speed, helicopter manufacturers increasingly have come up with non-conventional configurations in recent years. Amongst these, Airbus Helicopters' RACER is a compound helicopter equipped with a boxwing and lateral pusher rotors. In combination with the main rotor, these additional components determine the aerodynamic characteristics of the helicopter. Thereby, depending on the flight conditions, their individual performance is influenced by a variety of interactions. As the understanding of these interactions is vital for the evaluation of the overall system, the respective mutual influence of main rotor, wings and lateral rotors is analysed in this paper for cruise flight. For this reason, high-fidelity coupled aerodynamic simulations are conducted not only for the full RACER configuration but also for reduced setups omitting individual components in order to isolate the effect of these components on the helicopter's aerodynamic performance.
APA, Harvard, Vancouver, ISO, and other styles
3

Frey, Felix, Manuel Keßler, Ewald Krämer, Jakob Thiemeier, and Constantin Öhrle. "Aerodynamic Interactions on Airbus Helicopters' Compound Helicopter RACER in Hover." In Vertical Flight Society 76th Annual Forum & Technology Display. The Vertical Flight Society, 2020. http://dx.doi.org/10.4050/f-0076-2020-16470.

Full text
Abstract:
In recent years, helicopter manufacturers have developed an increasing number of non-conventional configurations in order to extend flight envelopes of helicopters towards higher cruise speed. Airbus Helicopters' approach is the compound helicopter RACER, which is equipped with a boxwing and lateral pusher rotors. As the combination of these components with the main rotor induces a variety of mutual interactions, influencing their individual aerodynamic performance depending on the flight conditions, the understanding of these interactions is vital for the evaluation of the overall system. For this reason, the respective mutual influence of main rotor, wings and lateral rotors is analysed in this paper for hover. With the help of high-fidelity coupled aerodynamic simulations for the full RACER configuration as well as for setups omitting individual components, first- and second-order interactions of these components are isolated and analysed for their effect on the helicopter’s aerodynamic performance.
APA, Harvard, Vancouver, ISO, and other styles
4

Kumar, Anil, and Pinhas Ben-Tzvi. "Extraction of Impact of Wind Turbulence on RC Helicopters Using Machine Learning." In ASME 2016 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. American Society of Mechanical Engineers, 2016. http://dx.doi.org/10.1115/detc2016-59384.

Full text
Abstract:
This paper presents a new cost effective wireless telemetry system capable of estimating ambient air turbulence using RC helicopters. The proposed telemetry system correlates the RC helicopter’s flight dynamics with ship air wake patterns generated by cruising naval vessels. The telemetry system consists of two instrumentation units each equipped with aviation grade INS/IMU sensors to measure dynamics of the helicopter with respect to the concerned naval vessel. The presented telemetry system extracts ship air wake patterns by removing the helicopter dynamic effects from actual measurements. This paper presents a comprehensive comparison between popular machine learning algorithms in eliminating effects of pilot inputs from helicopter’s dynamics measurements. The system was tested on data collected in a wide range of wind conditions generated by modified YP676 naval training vessel in the Chesapeake Bay area over a period of more than a year.
APA, Harvard, Vancouver, ISO, and other styles
5

Lotoa, R. T. "VIBRATION CHARACTERISTICS AND FAULT ANALYSIS OF HELICOPTER PEDALS." In Topics In Chemical & Material Engineering (TCME). Volkson Press, 2023. http://dx.doi.org/10.26480/smmp.01.2023.102.107.

Full text
Abstract:
Helicopters have numerous rotating components, and the vibrations generated during flight are significant, which negatively affects the pilot’s flight control and physical and mental health. Therefore, vibration reduction and noise attenuation of helicopters are crucial research areas. Pilots complete flight missions through the flight control system, and the usability and comfort of the control system directly affect flight quality and safety. For a certain type of helicopter where excessive pedal vibration caused a “pedal-kick” fault, this paper employed a real-time vibration monitoring system to test and monitor the helicopter pedal vibration. Based on the flight test data, a spectral analysis was conducted on the helicopter pedal vibration signal to determine the abnormal vibration frequency. Then, by combining the comfort decrease limits and evaluation criteria for whole-body vibration exposure, the helicopter’s aft cabin pedal vibration was diagnosed for faults. The source of the pedal “kick” vibration was accurately located, and after implementing relevant measures, the fault was successfully resolved.
APA, Harvard, Vancouver, ISO, and other styles
6

Leong, Michael. "Attack Helicopter Generations." In Vertical Flight Society 76th Annual Forum & Technology Display. The Vertical Flight Society, 2020. http://dx.doi.org/10.4050/f-0076-2020-16261.

Full text
Abstract:
Attack helicopters have gone through several notable changes in development and capabilities throughout their history, changes which are continuing to this day. These changes can be captured in distinct generations of attack helicopters, with significant similarities to generations of fighter aircraft development. Understanding the technological development contained in each generation of attack helicopters gives a relative comparison of the capabilities contained in each and the technology trajectory of improvement. This paper will attempt to categorize attack helicopter development by generations, providing the various characteristics and rationale for each, as well as defining the implications of this development for current design and future attack helicopter improvements.
APA, Harvard, Vancouver, ISO, and other styles
7

Oltheten, Erik. "Restoring Practical Single Engine IFR to the Marketplace." In Vertical Flight Society 76th Annual Forum & Technology Display. The Vertical Flight Society, 2020. http://dx.doi.org/10.4050/f-0076-2020-16343.

Full text
Abstract:
Attempting to pick through bad weather - becoming disoriented in diminished visibility or striking a wire or obstacle at low altitude - remains one of the major causes of fatal helicopter accidents. It is more common than engine failure, more common than mechanical failures, and more common than systems failures. While some feel the answer involves more tools to enable low-flying helicopters to avoid terrain and obstacles, a better solution is to keep helicopters safely away from terrain and obstacles using instrument flight rules (IFR) when weather conditions demand. For single engine helicopters, which form the largest population of helicopters, this means finding cost effective ways to provide them with safe and practical IFR capability. IFR capability is commonplace in airplanes, even among entry-level and training aircraft. An IFR rating is typically the first rating sought after an airplane pilot receives their license. For helicopters, there is currently not a parallel culture of shifting to the safety of IFR operations when weather demands. The reasons are complex, but a significant factor affecting this culture today is that the entryl evel IFR rotorcraft is generally a twin-turbine-engine helicopter. By the time a helicopter pilot gets to this level of machine, he or she is typically well versed in the "alternate" methods of weather avoidance. Unfortunately, even IFR rated helicopter pilots tend to default to a practice of attempting to fly below the weather using visual flight rules (VFR). Increasing the availability of IFR-capable helicopters by restoring practical, low-cost IFR solutions to single engine rotorcraft is the first step in a process intended to change the rotorcraft safety culture. This paper describes a 5-year effort by associations, industry, and regulators to remove the obstacles to certifying low-cost IFR helicopters. By mid-year 2019, two single-engine helicopters were certified for IFR operations, ending an absence of more than 20 years from the marketplace, but these were newly-manufactured aircraft. The remaining challenge is to apply what has been done in order to allow cost-effective retrofits of IFR capability to the existing fleet of VFR helicopters. The hope is that, with the trail now blazed, others will follow, and we will see even more single-engine rotorcraft with IFR capability and fewer weather-related accidents.
APA, Harvard, Vancouver, ISO, and other styles
8

(Retd.), Colonel. "Perseverance: Some Reflections on 55 Years of the Canadian Sea King." In Vertical Flight Society 76th Annual Forum & Technology Display. The Vertical Flight Society, 2020. http://dx.doi.org/10.4050/f-0076-2020-16262.

Full text
Abstract:
On August 1, 1963, the first two Canadian Sea King helicopters arrived at their new home station, Shearwater, Nova Scotia and joined the Royal Canadian Navy. On Saturday, December 1, 2018, three Canadian Sea King helicopters, now part of the Royal Canadian Air Force, made their final flight over their home station at Patricia Bay, British Columbia. This paper outlines some of the highlights of the intervening 55 years with particular emphasis on procurement and fleet introduction, the helicopter's rapid change of roles from dedicated anti-submarine warfare helicopter to a general-purpose surveillance platform for the First Gulf War and finally, the truly amazing accomplishments of the Canadian Sea Kings in the year 2010. It is worth bearing in mind that although the personnel may have changed and the roles and equipment of the aircraft have been modified, the requirement to provide ‘Wings for the Fleet’ has remained constant over the years.
APA, Harvard, Vancouver, ISO, and other styles
9

Green, David, Dr Harrison, Dr Bayoumi, and Hamid Nouri. "An Innovative Approach for Establishing Power Train Inspection Intervals of Modern Helicopters." In Vertical Flight Society 75th Annual Forum & Technology Display. The Vertical Flight Society, 2019. http://dx.doi.org/10.4050/f-0075-2019-14654.

Full text
Abstract:
Modern transmissions are the product of years of development. The newest materials and software are typically used to design helicopter power trains that are expected to safely endure operations traditionally characterized as representing composite worst-case usage, a level of usage severity that is well above the limits established in the OEM flight manual. In addition, the introduction of Helicopter Flight Data Monitoring programs has systematically constrained the actual usage to a level of severity that is substantially below that allowed by the OEM flight manual. Validation projects have enabled experience to be accumulated with a variety of helicopters and this has demonstrated that many helicopters are currently operating in a way that is best described as involving benign usage. This is partially because the assemblies are so robust and partially because some helicopter usage is systematically constrained to the flight profiles that are actually needed to accomplish the missions. This paper finds that a significant portion of most modern helicopter fleets actually experience benign usage. This finding supports the conclusion that helicopter OEMs can and should provide operators with the option to choose either the traditional inspection intervals for unmonitored operations or choose a set of longer supplemental inspection intervals for helicopters involved in monitored flight operations.
APA, Harvard, Vancouver, ISO, and other styles
10

F. Sansón, Lázaro, Victor A. de Campos, and Alain S. Potts. "Robust Model-Based Fault Detection and Isolation of a Six Degree of Freedom Helicopter." In Congresso Brasileiro de Automática - 2020. sbabra, 2020. http://dx.doi.org/10.48011/asba.v2i1.1048.

Full text
Abstract:
Helicopters are high cost and safety systems with a strong control system designed to maintain the helicopter performance, stability, and flight qualities. However, there exist faults that negatively aect the helicopter desirable behaviour; therefore, fault detection and isolation must be done to early detect, isolate and eliminate these faults. Because of helicopters are strongly nonlinear systems, and are aected by uncertainties and by external disturbances aswind bursts, robust residuals generation is required to correctly detect and isolate faults in the helicopter actuators and sensors. This paper leads with the robust fault detection and isolation of a six-degree of freedom helicopter benchmark using the disturbance decoupling method and the unknown input observer robust residuals generator. A generalized observer scheme is employed for fault isolation purposes.
APA, Harvard, Vancouver, ISO, and other styles

Reports on the topic "Helicopters"

1

Johnson, Norman T. Why Aren't Helicopters Operating Jointly: A Case for a Joint Helicopter Doctrine. Fort Belvoir, VA: Defense Technical Information Center, October 2010. http://dx.doi.org/10.21236/ada535470.

Full text
APA, Harvard, Vancouver, ISO, and other styles
2

Alexander, Townsend G. Armed Helicopters for the U.S. Navy. Fort Belvoir, VA: Defense Technical Information Center, February 1992. http://dx.doi.org/10.21236/ada249902.

Full text
APA, Harvard, Vancouver, ISO, and other styles
3

Parker, Robert G. Planetary Gear Dynamics in Military Helicopters. Fort Belvoir, VA: Defense Technical Information Center, May 2000. http://dx.doi.org/10.21236/ada378777.

Full text
APA, Harvard, Vancouver, ISO, and other styles
4

Tucker, Heather, and Jennifer Crawford. Cockpit Accommodation in USN/USMC Helicopters. Fort Belvoir, VA: Defense Technical Information Center, January 2000. http://dx.doi.org/10.21236/ada384560.

Full text
APA, Harvard, Vancouver, ISO, and other styles
5

Germanos, John T., G. P. Raiford, and Gus G. Zakhem. Lifting and Tiedown of US Military Helicopters. Fort Belvoir, VA: Defense Technical Information Center, January 1995. http://dx.doi.org/10.21236/ada294618.

Full text
APA, Harvard, Vancouver, ISO, and other styles
6

Benson, L. J., Micheal J. White, and Kevin J. Murphy. Operational Noise Data for OH-58D Army Helicopters. Fort Belvoir, VA: Defense Technical Information Center, January 1992. http://dx.doi.org/10.21236/ada246822.

Full text
APA, Harvard, Vancouver, ISO, and other styles
7

Bessee, Gary B. Analysis of Debris from Helicopters from the Field. Fort Belvoir, VA: Defense Technical Information Center, January 2010. http://dx.doi.org/10.21236/ada516544.

Full text
APA, Harvard, Vancouver, ISO, and other styles
8

McCall, Wes. Naval Helicopters and SOF: How Joint Are We. Fort Belvoir, VA: Defense Technical Information Center, February 2005. http://dx.doi.org/10.21236/ada464524.

Full text
APA, Harvard, Vancouver, ISO, and other styles
9

Redman, James M. Changing Roles: Attack Helicopters as the Dominant Maneuver Force. Fort Belvoir, VA: Defense Technical Information Center, May 1998. http://dx.doi.org/10.21236/ada370750.

Full text
APA, Harvard, Vancouver, ISO, and other styles
10

Shender, Barry S. Human Tolerance to Acceleration Loads Generated in High-Performance Helicopters. Fort Belvoir, VA: Defense Technical Information Center, January 2000. http://dx.doi.org/10.21236/ada378150.

Full text
APA, Harvard, Vancouver, ISO, and other styles
You might also be interested in the extended bibliographies on the topic 'Helicopters' for particular source types:
Journal articles Dissertations / Theses Books
We offer discounts on all premium plans for authors whose works are included in thematic literature selections. Contact us to get a unique promo code!

To the bibliography