Results 231 to 240 of about 3,544,653 (296)

Acoustic performance of noise barrier based on sonic crystals with resonant elements

Applied Acoustics, 2019
Recent years have seen a growing interest in the potential for the use of sonic crystals as noise barriers. The frequencies of highest attenuation can be found by assuming that an integer number of half wavelengths fits the distance between the ...
Jan Radosz
exaly   +2 more sources

Aerodynamic Effects as a Maglev Train Passes Through a Noise Barrier

Flow, Turbulence and Combustion, 2020
John Sheridan, Guang Chen, Siniša Krajnovic   +2 more
exaly   +2 more sources

Skip Connection YOLO Architecture for Noise Barrier Defect Detection Using UAV-Based Images in High-Speed Railway

IEEE transactions on intelligent transportation systems (Print), 2023
Noise barriers play a critical role in reducing noise and preventing foreign object from invading railway. Noise barrier structural defects such as rusted column, deteriorated mortar layer and other damages make its structure unstable, thereby ...
Jingwen Cui, Yong Qin, Yunpeng Wu, Changhong Shao, Huaizhi Yang   +4 more
semanticscholar   +1 more source

Breaking the Heavy-Tailed Noise Barrier in Stochastic Optimization Problems

arXiv.org, 2023
We consider stochastic optimization problems with heavy-tailed noise with structured density. For such problems, we show that it is possible to get faster rates of convergence than $\mathcal{O}(K^{-2(\alpha - 1)/\alpha})$, when the stochastic gradients ...
Nikita Puchkin, Eduard A. Gorbunov, Nikolay Kutuzov, A. Gasnikov   +3 more
semanticscholar   +1 more source

Design optimization of noise barrier tunnels through component reuse: Minimization of costs and CO2 emissions using multi-objective genetic algorithm

, 2021
Reuse is known to be an effective method to increase the sustainability of the architecture, engineering, and construction industries, which account for a majority of CO2 emissions and waste generation.
Seong-Jun Kim, Sung-Ah Kim
semanticscholar   +1 more source

Airframe Noise-The Next Aircraft Noise Barrier

Journal of Aircraft, 1974
Progress in quieting the commercial aviation fleet has been achieved by reducing the noise generated by jet engines. Recent tests have indicated that noise produced by airflow over aircraft surfaces (lifting surfaces, landing gear, flaps, and cavities) is only 8 to 10 EPNdB below certification requirements for current aircraft and will likely be a ...
H. MORGAN, J. HARDIN
openaire   +1 more source

The Performance Of Multiple Noise Barriers

Journal of Sound and Vibration, 1994
Abstract A numerical model, based on boundary element techniques, was used to solve the acoustic wave equation in two dimensions, in order to study the performance of various configurations of road traffic noise barriers. The mean insertion loss for a broadband road traffic noise source over a range of receiver positions behind the barrier is used as
Crombie, D. H., Hothersall, D. C.
openaire   +1 more source

Analysis of barrier function based adaptive sliding mode control in the presence of deterministic noise

at - Automatisierungstechnik
Barrier function-based adaptive sliding mode control (BFASMC) is analyzed in presence of deterministic measurement noise. It is shown that, considering only boundedness of the measurement noise, it is impossible to select the controller parameters to ...
Luis Ovalle, Andrés González, Leonid M. Fridman, S. Laghrouche, Hussein Obeid   +4 more
semanticscholar   +1 more source

Aeroacoustic topology optimization of noise barrier based on Lighthill's acoustic analogy

, 2020
Topology optimization for the shape of noise barrier taking into account the aeroacoustic sound source is presented based on Lighthill's acoustic analogy approach.
Ki-Hyun Kim, G. Yoon
semanticscholar   +1 more source

Noise control by barriers—Part 2: Noise reduction by an absorptive barrier

Applied Acoustics, 1977
This paper presents a method of estimating the excess attenuation of a noise by an absorptive barrier covered with sound-absorbing materials. The approximate theory of diffraction by the absorptive barrier is derived from rigorous theory for a hard barrier.
K. Fujiwara, Y. Ando, Z. Maekawa
openaire   +1 more source