Essays about: "acoustic emission"

Showing result 21 - 25 of 29 essays containing the words acoustic emission.

  1. 21. The effect on noise emission from wind turbines due to ice accretion on rotor blades

    University essay from KTH/MWL Marcus Wallenberg Laboratoriet

    Author : Peter Arbinge; [2012]
    Keywords : wind turbine; wind turbines; noise; sound; acoustics; acoustic; ice; icing; ice accretion; rotorblades; rotor blades; IEC 61400-11;

    Abstract : Swedish EPA (Naturvårdsverket) noise level guide-lines suggest that equivalent A-weighted sound pressure levels (SPL) must not exceed 40 dBA at residents. Thus, in the planning of new wind farms and their location it is crucial to estimate the disturbance it may cause to nearby residents. READ MORE

  3. 22. A method to apply ISO 3745 for the sound power measurement of I.C. Engines in a limited space

    University essay from KTH/MWL Marcus Wallenberg Laboratoriet

    Author : Mehdi Mehrgou; [2012]
    Keywords : ;

    Abstract : The Reduction of engine noise, one of the primary noise sources in trucks and busses, is essential in order to fulfill various noise emission regulations such as ISO 362 [1]. At the same time, it is equally important to meet market demands in order to attract new customers while competing with other brands to lower overall noise levels. READ MORE

  4. 23. Directivity of sound from wind turbines : A study on the horizontal sound radiation pattern from a wind turbine

    University essay from KTH/MWL Marcus Wallenberg Laboratoriet

    Author : Manne Friman; [2011]
    Keywords : Directivity; wind; turbine; noise;

    Abstract : In the present paper, a study on the directivity of sound from a wind turbine has been conducted. The aim of the study is to investigate the horizontal sound radiation pattern through a field study compared to a noise prediction. READ MORE

  5. 24. Acoustic Emission in Alarm Applications

    University essay from Lunds universitet/Avdelningen för Biomedicinsk teknik

    Author : Niclas Olsson; Niklas Isaksson; [2011]
    Keywords : Technology and Engineering;

    Abstract : This thesis, issued by Securitas Direct, investigates the possibility of using acoustic emission as a basis for an intrusion alarm application. Piezoelectric elements were used to detect and characterize fractures in glass, metal and wooden materials. READ MORE

  6. 25. ANALYSIS & STUDY OF AI TECHNIQUES FORAUTOMATIC CONDITION MONITORING OFRAILWAY TRACK INFRASTRUCTURE : Artificial Intelligence Techniques

    University essay from Datateknik

    Author : Tanmay Podder; [2010]
    Keywords : Artificial intelligence; Non-destructive testing; Condition Monitoring; Machine Vision; Neural Network; Genetic Algorithm; Fuzzy Logic; Expert System.;

    Abstract : Since the last decade the problem of surface inspection has been receiving great attention from the scientific community, the quality control and the maintenance of products are key points in several industrial applications.The railway associations spent much money to check the railway infrastructure. READ MORE