Results 131 to 140 of about 53,427 (306)

Analysis of potential helicopter vibration reduction concepts [PDF]

, 1985
Results of analytical investigations to develop, understand, and evaluate potential helicopter vibration reduction concepts are presented in the following areas: identification of the fundamental sources of vibratory loads, blade design for low vibration,
Davis, M. W., Landgrebe, A. J.
core   +1 more source

Adaptive feedforward control design for gust loads alleviation and LCO suppression

, 2014
An adaptive feedforward controller is designed for gust loads alleviation and limit cycle oscillations suppression. Two sets of basis functions, based on the finite impulse response and modified finite impulse response approaches, are investigated to ...
Da Ronch, A., Ghandchi-Tehrani, Maryam, Li, E., Wang, Yongzhi   +3 more
core   +1 more source

Regionally Localized Electrolyte Engineering via UV Crosslinking for Stable Ether–Carbonate Lithium Metal Batteries

Advanced Functional Materials, EarlyView.
This work introduces a regionally localized electrolyte (RLE) that spatially separates ether‐ and carbonate‐based functions to stabilize both Li metal and high‐voltage cathodes. An immobilized ether‐rich layer directs Li+ transport, activates LiNO3 locally, and forms a uniform LiF‐rich SEI, enabling lower overpotential, uniform deposition, and long ...
Eunbin Lim, Jeanie Pearl Dizon Suba, Jaegu Cho, Sukeun Yoon, Kuk Young Cho   +4 more
wiley   +1 more source

Development of Acceleration Factors to Evaluate the Across-Wind and Torsional Accelerations for Wind-Sensitive Buildings

Buildings
Wind-induced acceleration represents one of the main challenges in the dynamic behavior of tall buildings. Its estimation can be carried out through experimental wind tunnel tests or using the analytical expressions proposed in various international ...
Daniel Corona-González, Adrián Pozos-Estrada   +1 more
doaj   +1 more source

Misalignment diagnosis of a planetary gearbox based on vibration analysis [PDF]

, 2014
As a critical power transmission system, planetary gearbox is widely used in many industrial important machines such as wind turbines, aircraft turbine engines, helicopters.
Abdalla, Gaballa M., Ball, Andrew, Chen, Zhi, Gu, Fengshou, Tian, Xiange, Zhen, Dong   +5 more
core  

Giant Intrinsic Chirality Amplification of Aqueous Lead Halide Perovskite Nanocrystals via H‐Bond Driven Self‐Assembly Superstructures

Advanced Functional Materials, EarlyView.
Water‐assisted monoclinic CsPbBr3 transformation strategy is applied for synthesizing aqueous CsPbBr3/CsPb2Br5 nanocrystals with superior water‐repellent and excellent optical property. Low temperature enhanced hydrogen bonding network self‐assembled CsPbBr3/CsPb2Br5 nanocrystals into asymmetric superstructures, which exhibit notable circularly ...
Mei Huang, Pengfei Liu, Zhihong Zhang, Ruijing Fu, Kar Wei Ng, Qingguang Zeng, Bo Wang, Shuangpeng Wang   +7 more
wiley   +1 more source

Multi‐Responsive Dendrimer‐Hyaluronic Acid Hydrogel With Lubricating and Immunoregulatory Functions for Synergistic Osteoarthritis Therapy

Advanced Functional Materials, EarlyView.
A hydrogel with dynamic cross‐links was formed by cross‐linking hyaluronic acid with curcumin‐preloaded, phenylboronic acid‐modified poly(amidoamine) dendrimers. This hydrogel exhibited excellent injectability and self‐healing ability, enabling controlled Cur release in response to low pH, high reactive oxygen species (ROS) generation, or mechanical ...
Junjie Liu, Mengsi Zhan, Haoyu Huang, Jianhong Wang, Cheng Ni, Xiaojun Zhou, Hannah Küttner, Cong Song, Xiangyang Shi, Andrij Pich   +9 more
wiley   +1 more source

Nonlinear Characterisation of Wind Turbine Gearbox Vibration Dynamics Driven by Inhomogeneous Helical Gear Wear

Vibration
Helical gear transmissions in wind turbine gearboxes operate under high torque, variable speed, and complex rolling–sliding contact conditions, where friction-induced wear evolves in a spatially non-uniform manner.
Khaldoon F. Brethee, Ghalib R. Ibrahim, Al-Hussein Albarbar   +2 more
doaj   +1 more source

System analysis approach to deriving design criteria (Loads) for Space Shuttle and its payloads. Volume 2: Typical examples [PDF]

The achievement of an optimized design from the system standpoint under the low cost, high risk constraints of the present day environment was analyzed.
Bullock, T., Holland, W. B., Kiefling, L. A., Kross, D. A., Ryan, R. S.   +4 more
core   +1 more source

Optimal control of the heave motion of marine cable subsea-unit systems [PDF]

, 1995
One of the key problems associated with subsea operations involving tethered subsea units is the motions of support vessels on the ocean surface which can be transmitted to the subsea unit through the cable and increase the tension.
Huang, S., Vassalos, D.
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