Essays about: "reverberation"

Showing result 16 - 20 of 73 essays containing the word reverberation.

  1. 16. Track Before Detect in Active Sonar Systems

    University essay from Uppsala universitet/Signaler och system

    Author : Johnny Ljung; [2021]
    Keywords : signal processing; active sonar systems; track-before-detect; target tracking; reverberation; signalbehandling; aktiva sonarsystem; spårning innan detektion; målspårning; reverberation;

    Abstract : Detection of an underwater target with active sonar in shallow waters such as the Baltic sea is a big challenge. This since the sound beams from the sonar will be reflected on the surfaces, sea surface and sea bottom, and the water volume itself which generates reverberation. READ MORE

  3. 17. Attenuation of fan noise with passive methods : An experimental study in the implementation of a ducted fan inside the body of a blended wing body UAV

    University essay from KTH/Skolan för teknikvetenskap (SCI)

    Author : Mustafa Kulbay; [2021]
    Keywords : ;

    Abstract : This report is about a novel approach to attenuation of fan noise in aerial vehicles, by way of implementing a ducted fan in the chassis of a four meter blended wing body plane. Three different one meter PVC pipes were used and their performances as silencers were tested by measuring the sound power level and calculating the insulation loss compared to a fan by itself. READ MORE

  4. 18. Field uniformity and isotropy investigation of Halmstad University's reverberation chamber : In collaboration with Halmstad University and Ericsson AB, Lund

    University essay from Högskolan i Halmstad/Akademin för informationsteknologi

    Author : Khaled Ads; [2020]
    Keywords : Reverberation chamber;

    Abstract : This thesis is the final module of the Master's program in Electronics Design at Halmstad University. The Master Thesis work is a part of an ongoing development of Halmstad University's reverberation chamber (RC), which is aimed at frequencies in the low GHz range. The development process has been passing in several phases. READ MORE

  5. 19. Simulating Low Frequency Reverberation in Rooms

    University essay from KTH/Marcus Wallenberg Laboratoriet MWL

    Author : Mattias Svensson; [2020]
    Keywords : Low frequencies; Room acoustics; Finite Difference Time Domain method; FDTD.; Rumsakustik; låga frekvenser; Finite Difference Time Domain metoden; FDTD.;

    Abstract : The aim of this thesis was to make a practical tool for low frequency analysis in room acoustics.The need arises from Acad’s experience that their results from simulations using raytracing software deviate in the lower frequencies when compared to field measurements inrooms. READ MORE

  6. 20. Decrease radiated emission from high frequency links

    University essay from Luleå tekniska universitet/Institutionen för system- och rymdteknik

    Author : Anna Vestin; [2020]
    Keywords : EMC; Spacewire;

    Abstract : There is a need for increasing speed on external links and harmonics are often seen and are a challenge to master. Especially for products within the space industry where the requirements are narrower due to the harsh environment it needs to withstand. READ MORE