Results 21 to 30 of about 13,840,373 (231)
Aerospace, 2023 This study assesses the influence of engine dynamic characteristics on helicopter handling quality during hover and low-speed forward flight. First, we construct the helicopter–engine coupling model (HECM) based on the power-matching relationship between
Yuan Wei +3 more
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Xibei Gongye Daxue Xuebao, 2021 A conventional helicopter flight dynamics model, which can be coupled with ship airwake date, is developed in this study. In the method, the ship airwake data is obtained by the high-accuracy DES model, and a strategy which can transmit CFD data to the ...
DENG Jinghui
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Flight dynamic simulation of helicopter forward flight through microburst wind field
Advances in Mechanical Engineering, 2017 A nonlinear dynamic model of a helicopter flying through a variable microburst wind field is developed. Equivalent wind field models are established based on the Soesman and gust models to analyze quantitatively the abrupt change when a helicopter enters
Tong Liu, Yuting Dai, Guanxin Hong
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Optimal design of fixed-pitch coaxial-rotor helicopter by using Particle Swarm Optimization
Nihon Kikai Gakkai ronbunshu, 2016 In this study, the optimal mechanical design method for fixed-pitch coaxial-rotor helicopter is proposed. The fixed-pitch coaxial-rotor helicopter has several advantages compared with other type helicopters.
Masahiro TATSUNO +3 more
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Вестник Самарского университета: Аэрокосмическая техника, технологии и машиностроение, 2017 A mathematical model of helicopter vertical takeoff was created. The model takes into account operating conditions and individual performance capabilities of a given helicopter. An optimization technique based on a genetic algorithm was introduced.
Yu. P. Onushkin +3 more
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Applied Sciences, 2023 The high level of noise in helicopter cabins considerably compromises the comfort and safety of the pilot and passengers. To verify the feasibility and effectiveness of microperforated panel composite sound absorption structures for noise suppression in ...
Chenglei Li +3 more
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Advanced Science, EarlyView.A self‐powered vibration sensing platform integrates a quasi‐zero‐stiffness piezoelectric harvester, synchronized electric charge extraction, energy management, and wireless ADC acquisition. Ambient vibration is simultaneously harvested as energy and digitized as information, enabling sustained real‐time waveform monitoring without external power.
Yizhou Li +10 more
wiley +1 more source
Flight Mechanics Modeling of the New Configuration Tilt-rotor
Hangkong gongcheng jinzhan, 2019 The flight mechanical model of tilt-rotor UAV is the basis of designing flight control rate and analyzing flight characteristics.Based on the engineering reality, the nonlinear flight mechanics model of a new configuration tilt-rotor UAV is set up ...
Zhang Lian +3 more
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Hover flight control of helicopter using optimal control theory [PDF]
INCAS Bulletin, 2015 This paper represents the optimal control theory and its application to the full scale helicopters. Generally the control of a helicopter is a hard task, because its system is very nonlinear, coupled and sensitive to the control inputs and external ...
Ahmed ABOULFTOUH +2 more
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Smart Bioinspired Material‐Based Actuators: Current Challenges and Prospects
Advanced Intelligent Systems, Volume 7, Issue 3, March 2025.This work gathers, in a review style, an extensive and comprehensive literature overview on the development of autonomous actuators based on synthetic materials, bringing together valuable knowledge from several studies. Furthermore, the article identifies the fundamental principles of actuation mechanisms and defines key parameters to address the size
Alejandro Palacios +4 more
wiley +1 more source