Katalog Czasopism

• Acoustic evaluation of road surfaces using different Close Proximity testing devices

  Publikacja

  • P. Mioduszewski
  • W. Sorociak,

  - APPLIED ACOUSTICS - Rok 2023

  According to the valid standard, Close Proximity (CPX) method intends to evaluate the influence of road surfaces on traffic noise. Measurements may be carried out with the use of a self-powered vehicle or a special test trailer equipped with testing tyre towed by another vehicle. Two different testing devices took part in the research organized in Poland in order to determine the ranking of road surfaces in terms of acoustic parameters....

  Pełny tekst do pobrania w serwisie zewnętrznym

• The Caustic in the Acoustics of Historic Interiors

  Publikacja

  • A. Kulowski

  - APPLIED ACOUSTICS - Rok 2018

  In the paper, caustics are discussed as ordered forms of focus broadening occurring in concave mirrors. Presented are examples of caustics formed in natural conditions and application of the phenomenon in different fields of science and technology. Against this factual background, the possibility to observe caustics in rooms is pointed out. Special emphasis is put on large rooms of historic character, as such interiors frequently...

  Pełny tekst do pobrania w portalu

• Analysis of a caustic formed by a spherical reflector: Impact of a caustic on architectural acoustics

  Publikacja

  • A. Kulowski

  - APPLIED ACOUSTICS - Rok 2020

  Focusing sound in rooms intended for listening to music or speech is an acoustic defect. Design recommendations provide remedial steps to effectively prevent this. However, there is a category of objects of high historical or architectural value in which the sound focus correction is limited or even abandoned. This also applies to indoor or outdoor concert shells, installations for teaching and acoustic presentations, etc. The...

  Pełny tekst do pobrania w portalu

• Study of probe signal bandwidth influence on estimation of coherence bandwidth for underwater acoustic communication channel

  Publikacja

  • I. Kochańska
  • J. Schmidt
  • A. Schmidt

  - APPLIED ACOUSTICS - Rok 2021

  A signal transmitted in a shallow Underwater Acoustic Communication (UAC) channel suffers from time dispersion due to the multipath propagation and the refraction phenomena. This causes intersymbol interference of the received signal and frequency-selective fading observed in its spectrum. Coherence bandwidth is one of the key transmission parameters used for designing the physical layer of a data transmission system to minimise...

  Pełny tekst do pobrania w portalu

• Development of the urban rail vehicle acoustic model

  Publikacja

  • P. Komorski
  • G. Szymański
  • T. Nowakowski
  • T. Nowakowski

  - APPLIED ACOUSTICS - Rok 2022

  Pełny tekst do pobrania w serwisie zewnętrznym

• New approach to railway noise modeling employing Genetic Algorithms

  Publikacja

  • M. Szwarc
  • A. Czyżewski

  - APPLIED ACOUSTICS - Rok 2011

  Main goal of this paper was to describe an innovative method of noise prediction based on Genetic Algorithms. First part of the paper addresses the problem of growing noise, mainly in the context of a unified method for measuring noise. Further, Genetic Algorithms are described with regards to their fundamental features. Further a description is provided as to how Genetic Algorithms were used in the area of noise modeling. Next...

  Pełny tekst do pobrania w serwisie zewnętrznym

• Inhomogeneity of low-noise wearing courses evaluated by tire/road noise measurements using the close-proximity method

  Publikacja

  • P. Mioduszewski
  • W. Gardziejczyk

  - APPLIED ACOUSTICS - Rok 2016

  Performing numerous analyses of tire/road noise measurements on low-noise pavements during the last several years, the authors observed significant inhomogeneity of the wearing course in numerous cases, while similar problems were almost non-existent when dense pavements were measured. Three main causes of low-noise pavement inhomogeneity can be defined. The first one is imperfections in the technology used for asphalt mix production...

  Pełny tekst do pobrania w serwisie zewnętrznym

• Calibration of acoustic vector sensor based on MEMS microphones for DOA estimation

  Publikacja

  • J. Kotus
  • G. Szwoch

  - APPLIED ACOUSTICS - Rok 2018

  A procedure of calibration of a custom 3D acoustic vector sensor (AVS) for the purpose of direction of arrival (DoA) estimation, is presented and validated in the paper. AVS devices working on a p-p principle may be constructed from standard pressure sensors and a signal processing system. However, in order to ensure accurate DoA estimation, each sensor needs to be calibrated. The proposed algorithm divides the calibration process...

  Pełny tekst do pobrania w serwisie zewnętrznym

• noise map validation by continuous noise monitoring

  Publikacja

  • P. Mioduszewski
  • J. Ejsmont
  • J. Grabowski
  • D. Karpiński

  - APPLIED ACOUSTICS - Rok 2011

  Artykuł dotyczy porównania dwóch rodzajów oceny hałasu w aglomeracjigdańskiej. Pierwsza ocena została przygotowana na podstawie prognozy hałasu w oparciu o mapy stworzone metodami obliczeniowymi w roku 2007. Druga ocena bazuje na rzeczywistych danych pomiarowych zarejestrowanych przez system ciągłego monitoringu działającego w aglomeracji od 2008 roku. W artykule zaprezentowano i przeprowadzono analizy występujących różnic pomiędzy...