Sökning: "sound measurement"

Visar resultat 1 - 5 av 178 uppsatser innehållade orden sound measurement.

  1. 1. DRONAR: Obstacle echolocation using ego-noise

    Master-uppsats, Linköpings universitet/Institutionen för systemteknik

    Författare :Henrik Nilsson; [2023]
    Nyckelord :Drone; Autonomous systems; Obstacle avoidance; Sound; Noise; Planning; SONAR; Ego-noise; Multi-rotor aerial vehicle; Unmanned areal vehicle; Drönare; Autonoma system; Hinderundvikning; Ljud; Oljud; Planering; SONAR; Egenljud; Multirotorfordon; Obemannat luftfordon;

    Sammanfattning : You do not want your drone to crash. Therefore, safety systems should be put in place to prevent such an event, and obstacle avoidance is a major part of this. Today, the most successful techniques use cameras or light detection and ranging (LIDAR) to find and avoid obstacles; but to improve resiliency, multiple systems should be used. LÄS MER

  3. 2. Calibration of the Measurement System for Methane Pyrolysis in Rocket Nozzle Cooling Channels

    Master-uppsats, KTH/Skolan för industriell teknik och management (ITM)

    Författare :Jennifer Ly; [2023]
    Nyckelord :Correlational method; gas analysis; real time measurements; speed of sound; thermal conductivity; methane pyrolysis; rocket nozzle cooling; Korrelationsmetod; gasanalys; mätningar i real tid; ljudhastighet; värmeledningsförmåga; metanpyrolys; kylning av raketmunstycken iv;

    Sammanfattning : Methane-based rocket propellant is gaining traction as a green technology with advantages in sustainability, cost-effectiveness, and performance. However, under high temperatures found in rocket nozzle cooling channels, methane can undergo thermal decomposition known as methane pyrolysis, resulting in the generation of hydrogen and solid carbon. LÄS MER

  4. 3. Analys av ljudabsorberande spaltpaneler med varierande spjälbredd : En studie med mål att tillförse mätdata samt analysera stående våg över spjälbredd

    Kandidat-uppsats, KTH/Skolan för elektroteknik och datavetenskap (EECS)

    Författare :Johan Wangärd; Arthur Öhman; [2023]
    Nyckelord :Akustik; Spaltpanel; Membranabsorbent; Ljudabsorption; Helmholtzresonans;

    Sammanfattning : This study is based on a hypothesis from Delta Akustik AB regarding standing waves in slotted panels and the requisite for measurement data regarding its sound absorption. The purpose is to acquire measurement data and to examine three types of slotted panels and the possibility of a standing wave vertically in the boards. LÄS MER

  5. 4. Accounting for the Measurement Bias: A Study of Market Efficiency in the United States and the Relevance of Extensive Fundamental Analysis in Equity Valuation

    D-uppsats, Handelshögskolan i Stockholm/Institutionen för redovisning och finansiering

    Författare :Erik Bergmark; Hugo Freudenthal; [2023]
    Nyckelord :Accounting valuation bias; Fundamental analysis; Horizon Value; Market mispricing; Residual income valuation;

    Sammanfattning : This thesis investigates abnormal returns over the period 1983-2021 from an investment strategy that is based on public accounting information. Investment positions are taken in US manufacturing firms and are held for 36 months using a self-financing (hedged) portfolio. LÄS MER

  7. 5. Prediction of Reverberation Time in Office Spaces by Investigation of the Scattering Factor in Odeon

    Master-uppsats, KTH/Teknisk akustik

    Författare :Viktor Söderlund; [2023]
    Nyckelord :Scattering Factor; Reverberation Time; Odeon; Sabine; Arau-Puchades; Spridningsfaktor; Efterklangstid; Odeon; Sabine; Arau-Puchades;

    Sammanfattning : Accurate estimations of the reverberation time of furnished office spacesis essential as an acoustic consultant. A time efficient way to predict thefurniture’s effect is to investigate it by software modelling. The room acousticsoftware Odeon is suitable for doing this. LÄS MER