Results 41 to 50 of about 7,858 (154)

Effect of rotor stiffness and lift offset on the aeroacoustics of a coaxial rotor in level flight [PDF]

, 2009
The acoustic characteristics of a twin contra-rotating coaxial rotor configuration with significant flapwise stiffness are investigated in steady forward flight.
Brown, Richard, Duraisamy, Karthikeyan, Kim, Hyo Wan   +2 more
core  

Quantification of rheological parameters in deep‐sea mining plumes

Deep Underground Science and Engineering, Volume 5, Issue 1, Page 250-265, March 2026.
This study explores the variations in rheological properties observed during the propagation of deep‐sea mining plumes, utilizing rheological test data obtained from kaolin clay plumes. Subsequently, taking into account the differences in sediment properties, the effects of clay content and clay mineral composition on the rheological parameters of ...
Xiaolei Liu, Yihan Liu, Yonggang Jia, Xingsen Guo   +3 more
wiley   +1 more source

Experimental study of nonlinear vibration characteristics of a two-rotor turbofan engine system with an intershaft support

Авіаційно-космічна техніка та технологія
The layout of the turbofan engine with coaxial rotors and intershaft rear support of the high-pressure rotor is the most compact one since the rear supports of both rotors are located in one oil cavity, provided with a joint system of communications for ...
Sergey Filipkovskij, Sergey Chaikin
doaj   +1 more source

Experimental Investigations of Acoustic Characteristics of Two Counter-Rotating Rotors. [PDF]

, 2016
The presented investigations are continuation of earlier researches performed in the Institute of Turbomachinery (Lodz University of Technology, Poland). The main aim of this paper is to investigate the acoustics properties of the chosen configuration of
Błaszczak, Jarosław R., Rydlewicz, Wojciech   +1 more
core  

Real-time evolution of an embedded controller for an autonomous helicopter [PDF]

, 2008
In this paper we evolve the parameters of a proportional, integral, and derivative (PID) controller for an unstable, complex and nonlinear system. The individuals of the applied genetic algorithm (GA) are evaluated on the actual system rather than on a ...
Coupland, Simon, Gongora, Mario, Hopgood, Adrian A., Passow, Benjamin N.   +3 more
core   +2 more sources

Simulation and Experimental Investigation of Low‐Speed Centrifugal Pump Coupled With Vertical Ultra‐Low‐Head Turbine for Small‐Scale Irrigation

Engineering Reports, Volume 8, Issue 3, March 2026.
From the reviews, a new concept of a low‐speed centrifugal pump (LSCP) driven by a vertical ultra‐low‐head hydro turbine (VULHT) was designed and tested on simulation and physical setup. It was performed with a 1.8 m delivery head, concluding as inefficient. For ultra‐low‐head conditions, different than centrifugal action is recommended.
Raj Kumar Chaulagain, Pratik Ghimire, Saugat Ojha, Pratik Bhusal, Ankit Gautam   +4 more
wiley   +1 more source

Ions as Architects of DNA Nanostructures: Mechanisms, Simulations, and Technological Frontiers

Small Structures, Volume 7, Issue 3, March 2026.
Ions are not merely passive electrolytes but active regulators of DNA nanostructures. This review shows how ion valence, hydration, and specificity govern electrostatic screening, correlation, and confinement, enabling DNA origami, metallized DNA, nanopores, hydrogels, DNAzymes, molecular machines, and energy devices through integrated experimental and
Sergiy Perepelytsya, Dmytro Piatnytskyi, Tetiana Bubon, Narcis Cibotariu, Aatto Laaksonen, Francesca Mocci   +5 more
wiley   +1 more source

Aerodynamic loading on sharp and blunt trailing-edged rotor blades at high advance ratio

Advances in Aerodynamics
Reverse flow on the retreating side of a rotor disk is an intrinsic aerodynamic limitation of high-speed, high advance ratio rotorcraft. For traditional single main rotor helicopters, the influence of flow reversal is not significant, but it is important
Oliver D. Wild, Matthew J. Murphy, Anya R. Jones   +2 more
doaj   +1 more source

Advances in Triboelectric Nanogenerators With Rotating Structure

Carbon Energy, Volume 8, Issue 2, February 2026.
The rotating TENG has been widely studied for its superiorities of simple structure, high efficiency, and stable output. This review introduced the four different principles of rotating TENG and offered a thorough summary for performance and application research through three‐level classification. Importantly, the current existing problems, challenges,
Chuguo Zhang, Chunxu Xue, Yutong Chen, Yujie Qiang, Seeram Ramakrishna   +4 more
wiley   +1 more source

Impact of Position Measurement Angle Error on Performance of PMSM Drives for Electric Power Steering in a Wide Speed Range

IET Electric Power Applications, Volume 20, Issue 1, January/December 2026.
The position measurement angle error (contains measurement delay angle and periodic angle error) plays a significant role in PMSM drives, especially when the motor is rotating in the flux weakening (FW) region. In this paper, the impact of the position angle error on the performance of the PMSM drives for EPS in a wide speed range has been elaborated ...
Xi Liu, Yingzhe Wu, Hengbin Zhang, Yuxiang Xue, Lisheng Wang, Hui Li, Shan Yin   +6 more
wiley   +1 more source