Search for dissertations about: "airborne noise"

Showing result 11 - 15 of 24 swedish dissertations containing the words airborne noise.

  2. 11. Natural and Controlled Source Magnetotelluric Data Processing and Modeling

    Author : Chunling Shan; Thomas Kalscheuer; Laust Pedersen; Mehrdad Bastani; Thorkild Rasmussen; Uppsala universitet; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; Geophysics; Airborne Electromagnetic Method; Radio Magnetotellurics; Controlled Source Magnetotellurics; Electrical Resistivity Tomography; Moving Magnetotellurics; 2D inversion; 3D inversion;

    Abstract : In this thesis, four studies using different geophysical electromagnetic methods are presented. In the first study dealing with airborne measurements, the noise response due to the rotation of the aircraft and the aircraft itself as a metallic conductive body on the Earth's electromagnetic response in very low frequency and low frequency band was investigated. READ MORE

  4. 12. Railway Open System Tribology

    Author : Yezhe Lyu; Ulf Olofsson; KTH; []
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Wheel; Rail; Brake; Environmental conditions; Tribology; Noise; Particle; Hjul; Räl; Broms; Miljöförhållanden; Tribologi; Ljud; Partiklar; Machine Design; Maskinkonstruktion;

    Abstract : Tribology in the railway system is of increasing interest in the new railway era due to the demand for higher speed and load capacity. Since railway vehicles operate in an open environment, their performance depends greatly on temperature, humidity and natural and artificial contaminants. READ MORE

  5. 13. On Fluid Power Piston Pumps : With Special Reference to Flow Ripple Reduction

    Author : Maria Pettersson; Linköpings universitet; []
    Keywords : ;

    Abstract : Among the major disadvantages of fluid power systems, leakage and an unpleasant sound level can be mentioned. Both drawbacks increase with increasing pressure ripple. Functional problems may be caused, even fatigue and breakdown. A main source of noise is hydrostatic pumps. READ MORE

  6. 14. Assessment and control of tonal components in electric vehicles

    Author : David Lennström; Etienne Parizet; Luleå tekniska universitet; []
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Teknisk akustik; Engineering Acoustics;

    Abstract : New challenges arise for noise, vibration and harshness (NVH) engineers when electric motors are introduced into cars traditionally powered by internal combustion engines (ICE). The noise signature from an electric traction motor is characterized by speed-dependent high frequency tonal components due to electro-magnetic excitation. READ MORE

  7. 15. On Spectral Estimation and Bistatic Clutter Suppression in Radar Systems

    Author : Jacob Klintberg; Chalmers tekniska högskola; []
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Radar Signal Processing; Parametric Spectral Estimation; Maximum Likelihood Estimation; Space-Time Adaptive Processing;

    Abstract : Target detection serve as one of the primary objectives in a radar system. From observations, contaminated by receiver thermal noise and interference, the processor needs to determine between target absence or target presence in the current measurements. READ MORE