Wyniki wyszukiwania dla: radio wave propagation

• Measuring research on radio wave propagation

  Publikacja

  • S. J. Ambroziak

  - Rok 2010

  Telecommunication connections are increasingly based on the wireless links, both fixed and mobile, carried out under different radio systems. This kind of solution has many advantages. However, the propagation medium is a factor that causes many difficulties in designing wireless networks, because of large diversity of propagation environments. Transmission loss in each environment is determined by many variables phenomena and...

• Radio wave propagation conditions for terrestrial radiocommunications in the EHF band

  Publikacja

  • K. Bronk
  • R. Katulski
  • A. Lipka

  - International Journal of Electronics and Telecommunications - Rok 2008

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• Wave propagation in delaminated beam

  Publikacja

  • W. Ostachowicz
  • M. Krawczuk
  • M. Cartmell
  • M. Gilchrist

  - COMPUTERS & STRUCTURES - Rok 2004

  W pracy przedstawiono model oraz wyniki analizy propagacji fali sprezystejw belce z delaminacją.

• Calculation of the propagation loss in urban radio-access systems

  Publikacja

  • R. Katulski
  • A. Kiedrowski

  - IEEE ANTENNAS AND PROPAGATION MAGAZINE - Rok 2008

  Zweryfikowano eksperymentalnie modele propagacyjne opracowane dla telefonii komórkowej w mieście, stosowane przy analizach projektowych systemów dostępowych. Przeprowadzono obszerne badania pomiarowe i zebrano prawie 19 tys. pomiarów. Na tej podstawie, stosując wielowymiarową analize regresji oraz zaproponowaną charakterystykę propagacyjną radiowych łączy dostępowych, opracowano nowy wielowariantowy model propagacyjny przeznaczony...

• Propagation analysis of the point-to-point radio links operating in the band

  Publikacja

  • K. Bronk
  • R. Katulski
  • A. Lipka

  - POLISH JOURNAL OF ENVIRONMENTAL STUDIES - Rok 2009

  The theoretical possibilities of utilizing the EHF-band frequencies for point-to-point short range communications have been discussed. The most important factors that affect propagation attenuation in this band have been briefly described, as well as relevant mathematical formulas that allow for numerical analysis of these phenomena. After that, a research have been carried out in which the authors have analyzed propagation losses...

• Wave propagation in damage assessment of ground anchors

  Publikacja

  • B. Zima
  • M. Rucka

  - Journal of Physics : Conference Series - Rok 2015

  The inspection possibilities of ground anchors are limited to destructive test such as pull-out test. Guided wave propagation gives an opportunity to develop an inspection system dedicated to determine the condition of inspected element without violation of their integrity. In this paper the experimental study on wave propagation in laboratory models of ground anchors are presented. Experiments were conducted for different bonding...

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• Diagnostics of historic columns using wave propagation

  Publikacja

  • M. Zielińska
  • M. Rucka

  - Rok 2015

  This paper presents a numerical analysis of elastic wave propagation in columns of historical buildings for diagnostics purposes. Numerical calculations were performed using the finite element method in the Abaqus software package. The analysis was carried out for three types of brick columns: a full column, a column filled with debris, and a column empty inside. The excitation was in the form of a wave packet and signals of propagating...

• Analysis of wave propagation in a bolted steel joint

  Publikacja

  • R. Kędra
  • M. Rucka

  - Rok 2016

  The paper presents results of numerical and experimental investigations of elastic wave propagation in a bolted single-lap joint. The research was carried out for both symmetric and antisymmetric Lamb wave modes. In experimental studies the PZT transducers were used to excite and register wave propagation signals. The controlled value of the torque during measurements was ensured by the use of high precision torque wrenches. Numerical...

• Guided wave propagation in diagnostic of steel elements

  Publikacja

  • B. Zima
  • R. Kędra

  - Prace Studentów Politechniki Wrocławskiej. Seria : Konferencje - Rok 2014

  This paper is devoted to numerical investigations of elastic wave propagation in steel elements. The aim of this study is to conduct numerical analysis and experimental investigations on the propagation of elastic waves in steel elements in the context of damage detection. In particular, this paper is devoted to detection of damage occurring in the form of notch or changed thickness. This approach utilized the fact that any discontinuities...

• Guided wave propagation in diagnostic of steel elements

  Publikacja

  • B. Zima
  • R. Kędra

  - Rok 2014

  This paper is devoted to numerical investigations of elastic wave propagation in steel elements. The aim of this study is to conduct numerical analysis and experimental investigations on the propagation of elastic waves in steel elements in the context of damage detection. In particular, this paper is devoted to detection of damage occurring in the form of notch or changed thickness. This approach utilized the fact that any discontinuities...