Results 181 to 190 of about 3,999 (214)
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Takeoff optimisation of coaxial compound helicopter with uncertainty quantification
Optimization and Engineering, 2023zbMATH Open Web Interface contents unavailable due to conflicting licenses.
Zhao, Yanqin, Yuan, Ye, Chen, Renliang
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Flight Dynamics of a Coaxial Helicopter Hovering on Mars
2023This thesis develops a fundamental understanding of the flight dynamics and stability of a coaxial helicopter hovering on Mars. A simple flight dynamics solver is built to identify and investigate unique characteristics of Martian hover and validated with Ingenuity chamber test data from NASA JPL. The impact of two key parameters that are unique to the
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Stability Augmentation System for Coaxial Ultralight Helicopters
Proceedings of the Vertical Flight Society 76th Annual Forum, 2020In this paper, the concept, design and implementation of a stability augmentation system for coaxial ultralight helicopters is presented. For an exemplary realization, the CoAX 2D ultralight helicopter is used. It is a 2-seated helicopter with two teetering mainrotors in a coaxial configuration with a maximum take-off mass of 450kg developed by
Benedikt Grebing +4 more
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Redistributed Allocation for Flight Control Failure on a Coaxial Helicopter
Proceedings of the Vertical Flight Society 77th Annual Forum, 2021An elastic blade flight dynamics model for a coaxial helicopter based on the Sikorsky X2 Technology™ Demonstrator is presented and validated with steady trim and frequency response flight test data. A full authority explicit model following control architecture along with weighted pseudoinverse control allocation is implemented for the model in
Tom Berger +4 more
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Aeromechanics for a High Advance Ratio Coaxial Helicopter
Proceedings of the Vertical Flight Society 71st Annual Forum, 2015A comprehensive analysis for evaluating performance and vibratory loads of a coaxial helicopter is developed, and some validations are carried out against existing experimental data. The methodology is extended from baseline UMARC to include interactional rotor wake between the coaxial rotors, modeling of relative phase between rotors and trim ...
Joseph Schmaus, Inderjit Chopra
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Altitude control using limited pole placement on coaxial-helicopter
2014 IEEE 13th International Workshop on Advanced Motion Control (AMC), 2014This paper introduces an altitude control technique on coaxial-helicopter. Unmanned aerial vehicle (UAV) has been widely used with high performance computer (HPC) so far. Generally, advanced mathematics is used for flight control of the UAV on the HPC. However. the HPC has several problems, such as increase of cost and processing delays in calculation.
Yasunori Sugawara, Akira Shimada
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Indoor autonomous hovering control for a small unmanned coaxial helicopter
IEEE ICCA 2010, 2010For the nonlinear and open-loop unstable characteristics of the small helicopter, autonomous flight control is a challenging problem. In order to reduce the complexity of the helicopter autonomous control, this paper constructs an indoor autonomous flight control platform for a small coaxial helicopter ESky LAMA4, which is convenient for data ...
Shanjie Wu +2 more
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Inflight Measurements of the Empennage of an Ultralight Coaxial Helicopter
Proceedings of the Vertical Flight Society 81st Annual Forum and Technology DisplayThe empennage of a helicopter is largely responsible for its stability in forward flight. Its performance is mainly determined by its aerodynamics. In this paper, the empennage of a CoAX 2D ultralight research helicopter is analyzed in detail.
Lukas Rottmann +3 more
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Modelling and control of a coaxial helicopter UAV in an indoor laboratory
2016 3rd Conference on Control and Fault-Tolerant Systems (SysTol), 2016This paper describes the modelling, the control algorithm and the flight experiments performed with an Unmanned Aerial Vehicle (UAV). The vehicle is a coaxial toy helicopter and the control platform is an indoor platform with a computer vision sensor. The dynamic model of the vehicle as well as the identification process of its parameters are described.
Bartomeu Rubí +2 more
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Conceptual Design for the Performance Optimization of Compound Coaxial Helicopter
Applied Mechanics and Materials, 2016The purpose of this paper is to study the conceptual design and optimization of a compound coaxial helicopter. At the conceptual design phase, the compound coaxial helicopter design work was based on the conventional helicopter and fix-wing aircraft design method. The intersection of these aspects makes the design work more complex, thus, a program for
Fei Cao, Ming Chen, Mei Li Wen Wu
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