Sökning: "Broadband noise level."

Hittade 4 uppsatser innehållade orden Broadband noise level..

  1. 1. Experimental Study of Installation Effects on Cooling Fan Noise

    Master-uppsats, KTH/Marcus Wallenberg Laboratoriet MWL

    Författare :Yu-Yu Lu; [2021]
    Nyckelord :Electric vehicles; Cooling fan noise; Installation effects; Free-space measurement; Wall-mounted measurement; In-vehicle measurement; Spectral decomposition method; Tonality; Broadband noise level.;

    Sammanfattning : Owing to the ever-changing developments of battery and electric powertrain, vehicle electrification is the trend in the future. Without the presence of a combustion engine, masking effect from it reduces and noises from other components become perceivable. Among all, the cooling fan is one of the major noise sources. LÄS MER

  3. 2. Nonlinear Properties of Acoustic Liners Under High Level Random Excitation in Combination with Single-Tone Excitation

    Kandidat-uppsats, KTH/Skolan för teknikvetenskap (SCI)

    Författare :Julius Fritzell; [2017]
    Nyckelord :;

    Sammanfattning : With the increase in air travels the last decades the number of airplanes have increased dramatically. The sound generated by the engines have become a significant problem. The last 60 years a lot has been made trying to reduce the noise levels. Modern jet-engines generates a combination of broadband random noise and tonal components. LÄS MER

  4. 3. Stabilization of an optical frequency comb to an external cavity

    Uppsats för yrkesexamina på avancerad nivå, Umeå universitet/Institutionen för fysik

    Författare :Olof Rydberg; [2014]
    Nyckelord :;

    Sammanfattning : The subject of this master's thesis is stabilizing a frequency comb laser to an external cavity using a couple of servo controllers. The aim of the project was to build a pair of servo controllers, replacing parts of the existing commercial and proprietary solution already in use. LÄS MER

  5. 4. Wideband Amplifier Design for STO Technology

    Master-uppsats, KTH/Integrerade komponenter och kretsar

    Författare :Tingsu Chen; [2011]
    Nyckelord :Wideband Amplifier STO CMOS microwave;

    Sammanfattning : Spin Torque Oscillator (STO) is a promising technology for microwave and radar applications due to its large tunability, miniature size, high operation frequency, high integration level, etc. However, the technology comes also with issues and challenges,such as low output power and spectrum impurity. LÄS MER