Results 41 to 50 of about 2,244,832 (340)

Blockwise Subspace Identification for Active Noise Control [PDF]

, 2000
In this paper, a subspace identification solution is provided for active noise control (ANC) problems. The solution is related to so-called block updating methods, where instead of updating the (feedforward) controller on a sample by sample base, it is ...
Doelman, N.J., Fraanje, P.R., Verhaegen, M.   +2 more
core   +3 more sources

Investigation of the Uniformity of Gel Shrinkage by Imaging Tracer Particles Using X‐Ray Microtomography

Advanced Engineering Materials, EarlyView., 2023
A novel method for tracking structural changes in gels using widely accessible microcomputed tomography is presented and validated for various hydro‐, alco‐, and aerogels. The core idea of the method is to track positions of micrometer‐sized tracer particles entrapped in the gel and relate them to the density of the gel network.
Anja Hajnal, Mimololorun Lucy Aiyelari, Martin Dirauf, Pavel Gurikov   +3 more
wiley   +1 more source

Characterization of the aircraft bay/landing gear coupling noise at low subsonic speeds and its suppression using leading-edge chevron spoiler

Advances in Mechanical Engineering, 2019
When the aircraft opens the bay door to let the landing gear either drop or retract, the incoming flow will result in a significant amount of coupling noise from the bay and the landing gear.
Kun Zhao, Yong Liang, Tingrui Yue, Zhengwu Chen, Gareth J Bennett   +4 more
doaj   +1 more source

Sound pressure-dependent acoustic absorption by perforated rigid-frame porous materials

Acta Acustica
Porous materials are one of the most common classes of sound absorbers for acoustic treatments. However, thin layers of these classical materials are not efficient at absorbing low-frequency sound waves, which is a practical shortcoming.
Cavalieri Théo, Van Damme Bart
doaj   +1 more source

Dynamical Generation of Noiseless Quantum Subsystems [PDF]

, 2000
We present control schemes for open quantum systems that combine decoupling and universal control methods with coding procedures. By exploiting a general algebraic approach, we show how appropriate encodings of quantum states result in obtaining ...
A. M. Steane, C. Search, D. A. Lidar, D. Vitali, E. Knill, E. Knill, Emanuel Knill, G. Burkard, G. S. Agarwal, L. M. Duan, L. Viola, L. Viola, L. Viola, Lorenza Viola, P. W. Shor, P. Zanardi, P. Zanardi, P. Zanardi, S. Lloyd, Seth Lloyd, U. Haeberlen, W. Thirring   +21 more
core   +2 more sources

A Method for Determining the Optimal Location of a Distributed Sensor/Actuator

Shock and Vibration, 1994
The optimal location problem of distributed sensor/actuator for observation and control of a flexible structure is investigated. Using a property of controllability and observability grammian matrices, this approach employs a nonlinear optimization ...
Byeongsik Ko, Benson H. Tongue, Andrew Packard   +2 more
doaj   +1 more source

Effects of Background Sounds on Annoyance Reaction to Foreground Sounds in Psychoacoustic Experiments in the Laboratory: Limits and Consequences

Applied Sciences, 2019
In a variety of applications, e.g., psychoacoustic experiments, virtual sound propagation demonstration, or synthesized noise production, noise samples are played back in laboratories.
Armin Taghipour, Eduardo Pelizzari
doaj   +1 more source

Effect of offset distances for rod-airfoil interaction noise

Frontiers in Physics, 2023
The noise generated by the interaction between the wake of rods and airfoils is a universal phenomenon in the engineering field. The noise generation mechanism is mainly caused by the violent changes of the pulsating pressure on the airfoil surface ...
Shujie Jiang, Lanqing Li, Xiaokun Guo, Xiaokun Guo, Weiming Zhao, Rongping Zhang, Chao Wang   +6 more
doaj   +1 more source

Design and Evaluation of Active Noise Control on Machinery Noise [PDF]

APSIPA 2021, 2021
Construction workers and residents live near around construction sites are exposed to noises that might cause hearing loss, high blood pressure, heart disease, sleep disturbance and stress. Regulations has been carried out by national governments to limit the maximum permissible noise levels for construction works.
arxiv  

Numerical modeling techniques for noise emission of free railway wheels

Railway Engineering Science
In this article, we consider the numerical prediction of the noise emission from a wheelset in laboratory conditions. We focus on the fluid–structure interaction leading to sound emission in the fluid domain by analyzing three different methods to ...
Linus Taenzer, Urs Pachale, Bart Van Damme, Andrea Bergamini, Domenico Tallarico   +4 more
doaj   +1 more source