Results 61 to 70 of about 30,707 (232)

Time domain System Identification of Longitudinal Dynamics of Single Rotor Model Helicopter using SIDPAC [PDF]

Mehran University Research Journal of Engineering and Technology, 2015
This paper presents a time-domain approach for identification of longitudinal dynamics of single rotor model helicopter. A frequency sweep excitation input signal is applied for hover flying mode widely used for space state linearized model.
Arbab Nighat Khizer, Imtiaz Hussain, Wanod Kumar   +2 more
doaj  

One‐Dimensional Finite Elements With Arbitrary Cross‐Sectional Displacement Fields

International Journal for Numerical Methods in Engineering, Volume 127, Issue 1, 15 January 2026.
ABSTRACT This paper introduces an unprecedented unified approach for developing structural theories with an arbitrary kinematic variable over the beam cross‐section. Each of the three displacement variables can be analyzed using an independent expansion function. Both the order of the expansion and the number of terms in each field can be any. That is,
E. Carrera, D. Scano, E. Zappino
wiley   +1 more source

Research of Wind–Wave–Ship Coupled Effects on Ship Airwake and Helicopter Aerodynamic Characteristics

Journal of Marine Science and Engineering
The oceanic wind and waves, as well as the resultant ship motions, significantly impact the ship airwake and the operation of shipborne helicopters. A numerical method coupling wind, wave, ship and helicopter is developed using multiphase flow, in which ...
Kun Zong, Luyao Qi, Yongjie Shi, Wei Han, Shan Ma   +4 more
doaj   +1 more source

Flight Control of a Novel Distributed Tiltrotor UAV With Experiments

IET Control Theory &Applications, Volume 20, Issue 1, January/December 2026.
Considering the mode transition control of a novel distributed tiltrotor UAV, we designed a fast fixed‐time sliding mode attitude controller to improve the response speed and robustness of the control system. Furthermore, a smooth mode transition strategy is developed to guarantee the stable conversion between fixed‐wing and helicopter modes ...
Li Yu, Yong Ding, Peng Wang, Jialong Zhang, Lei Ye   +4 more
wiley   +1 more source

Sketch of the Configuration Scheme of Two-stage Variable Speed Gear Transmission in Unmanned Helicopter Main Gearbox

Jixie chuandong, 2018
For unmanned helicopter economic cruises,main rotor speed changes could be significant. At present,the most effective method of changing the main rotor speed associated with the great speed range and low cost is a variable speed gear transmission ...
Li Zhengminqing, Li Yingming, Wang Hao, Zhu Rupeng, Jin Guanghu   +4 more
doaj  

Utilising Drones in Agriculture: A Review on Remote Sensors, Image Processing and Their Application

Modern Agriculture, Volume 3, Issue 2, December 2025.
The utilisation of drones in agriculture involves the integration of advanced sensing technologies, data analytics and targeted applications. Drones equipped with sensors such as RGB, multispectral and hyperspectral capture diverse spatial and spectral data.
Chetan Yumnam, Andyco B. Marak, Manish Kumar, Sanjay Khatri, Shravan Kumar, Sapna Soni, K. Kabil, V. Balaji, Ramesh K. Sahni, Satya Prakash Kumar, V. P. Chaudhary   +10 more
wiley   +1 more source

An investigation of coupling ship/rotor flowfield using steady and unsteady rotor methods

Engineering Applications of Computational Fluid Mechanics, 2017
A coupling numerical methodology has been developed using the Navier–Stokes solver for ship/rotor flowfield simulation during the helicopter shipboard launch.
Yongjie Shi, Yi Xu, Kun Zong, Guohua Xu
doaj   +1 more source

Modelling the Draganflyer four-rotor helicopter

IEEE International Conference on Robotics and Automation, 2004. Proceedings. ICRA '04. 2004, 2004
The Draganflyer is a radio-controlled helicopter. It is powered by 4 rotors and is capable of motion in air in 6 degrees of freedom and of stable hovering. For flying it requires a high degree of skill, with the operator continually making small adjustments.
openaire   +2 more sources

Dynamics of helicopter rotor blades

Computers & Structures, 1988
A rotating blade finite element with coupled bending, torsion and axial stretching degrees-of-freedom is developed. APL is used for symbolic manipulations required for the development of the element. The element is implemented in MSC/NASTRAN to generate the numerical results.
Magari, P. J., Shultz, L. A., Murthy, V. R.   +2 more
openaire   +1 more source

Helicopter far-field acoustic levels as a function of reduced main-rotor advancing blade-tip Mach number [PDF]

During the design of a helicopter, the weight, engine, rotor speed, and rotor geometry are given significant attention when considering the specific operations for which the helicopter will be used. However, the noise radiated from the helicopter and its
Lemasurier, Philip, Mueller, Arnold W., Smith, Charles D.   +2 more
core   +1 more source