Results 71 to 80 of about 3,374 (244)

Adaptive Vibration Control of the Moving Cage in the 4 ×$\times$ 4 Hyperbolic PDE‐ODE Model of the Dual‐Cable Mining Elevator

IET Control Theory &Applications, Volume 19, Issue 1, January/December 2025.
This paper proposes an observer‐based adaptive output‐feedback boundary control to stabilize the vibrations of the moving cage of a dual‐cable mining elevator. This system is comprised of two mechanically jointed winding drums that drive the two cables through the floating sheaves to lift the cage.
Elham Aarabi, Mohammadali Ghadiri‐Modarres, Mohsen Mojiri   +2 more
wiley   +1 more source

Boosting flexible electronics with integration of two‐dimensional materials

InfoMat, Volume 6, Issue 7, July 2024.
The progress was summarized in the flexible electronics empowered by the two‐dimensional materials, including electronic skins (for sweat and temperature sensors), gas sensors, touch pads, nanogenerators for mechanical energy collection, flexible supercapacitors and batteries, transistors and logic circuits, as well as memristors for neuromorphic ...
Chongyang Hou, Shuye Zhang, Rui Liu, Thomas Gemming, Alicja Bachmatiuk, Hongbin Zhao, Hao Jia, Shirong Huang, Weijia Zhou, Jian‐Bin Xu, Jinbo Pang, Mark H. Rümmeli, Jinshun Bi, Hong Liu, Gianaurelio Cuniberti   +14 more
wiley   +1 more source

Exploring liquid fuel combustion dynamics in a swirl burner using dynamic mode decomposition

Engineering Applications of Computational Fluid Mechanics
Aero gas turbine engine combustors are transitioning from traditional Rich-Quench-Lean (RQL) staging to Lean Premixed Prevaporized (LPP) operation to reduce harmful NOx emissions and improve combustion efficiency.
Alireza Ghasemi, Jim B. W. Kok
doaj   +1 more source

Time domain modelling and stability analysis of complex thermoacoustic systems [PDF]

, 2007
Dieser Beitrag ist mit Zustimmung des Rechteinhabers aufgrund einer (DFG geförderten) Allianz- bzw. Nationallizenz frei zugänglich.This publication is with permission of the rights owner freely accessible due to an Alliance licence and a national licence
Bothien, Mirko R., Lacarelle, Arnaud, Moeck, Jonas P., Paschereit, Christian Oliver   +3 more
core   +1 more source

Fluidic Ultrasound Generation for Non‐Destructive Testing

Advanced Materials, Volume 36, Issue 18, May 2, 2024.
Air‐coupled ultrasound enables material characterization and fault detection for specimens that are very large or do not allow contact with other materials. This study presents a novel fluidic transducer that can withstand harsh environments and generates a high‐amplitude ultrasonic signal without impedance mismatch to air.
Benjamin Bühling, Stefan Maack, Christoph Strangfeld   +2 more
wiley   +1 more source

Acoustic Design Parameter Change of a Pressurized Combustor Leading to Limit Cycle Oscillations

Energies
When aiming to cut down on the emission of nitric oxides by gas turbine engines, it is advantageous to have them operate at low combustion temperatures. This is achieved by lean premixed combustion.
Mehmet Kapucu, Jim B. W. Kok, Artur K. Pozarlik   +2 more
doaj   +1 more source

Research on Suppression of Vibration Caused by Combustion Pressure Pulsation in Aircraft Engines

Shock and Vibration, Volume 2024, Issue 1, 2024.
Abnormal high‐energy narrowband signals appeared in the aircraft engine test. By analyzing the characteristics of the vibration signals and the pressure pulsation signals in the measurement point data of the engine, it can be speculated that the abnormal vibration energy of the engine is not related to the operation of rotating parts, which upends a ...
Liang Hong, Chao-Ping Zang, He-Jiong Ji, Qiu-Xia Yu, Yun-Fan Jiang, Lian Shen, Cong Gao   +6 more
wiley   +1 more source

Mixed acoustic–entropy combustion instabilities in gas turbines [PDF]

, 2014
A combustion instability in a combustor terminated by a nozzle is analysed and modelled based on a low-order Helmholtz solver. A large eddy simulation (LES) of the corresponding turbulent, compressible and reacting flow is first performed and analysed ...
Motheau, Emmanuel, Nicoud, Franck, Poinsot, Thierry   +2 more
core   +3 more sources

Acoustic Losses in Cryogenic Hydrogen at Transitions Between Tubes of Different Diameters

Hydrogen
Acoustic oscillations in cryogenic systems can either be imposed intentionally, as in pulse-tube cryocoolers, or occur spontaneously due to Taconis-type thermoacoustic instabilities.
Kian Conroy, Konstantin I. Matveev
doaj   +1 more source

Accounting for Acoustic Damping in a Helmholtz Solver [PDF]

, 2017
Thermoacoustic Helmholtz solvers provide a cheap and efficient way of predicting combustion instabilities. However, because they rely on the inviscid Euler equations at zero Mach number, they cannot properly describe the regions where aerodynamics may ...
Miguel-Brebion, Maxence, Ni, Franchine, Nicoud, Franck, Poinsot, Thierry   +3 more
core   +3 more sources