Essays about: "sound pressure level SPL"

Showing result 6 - 9 of 9 essays containing the words sound pressure level SPL.

  1. 6. Ultrasound induced cavitation and resonance amplification using adaptive feedback Control System

    University essay from Blekinge Tekniska Högskola/Institutionen för tillämpad signalbehandling

    Author : Vipul. vijigiri; Taraka Rama Krishna Pamidi; [2014]
    Keywords : Acoustic cavitation; optimization; FFT analysis; pure sine excitation; Sonotrode or ultrasonic horn; High intensity ultrasound; Sound pressure level SPL Acoustic pressure field; Feedback control; Master of Science Programme in Electrical Engineering with emphasis on Signal Processing Masterprogram i Elektroteknik med inriktning mot signalbehandling;

    Abstract : Acoustic cavitation in fluids using high powered ultrasound has been of great interest in industries and biomedical engineering. The need for high-intensity focused ultrasound (sound with frequencies between 20 kHz to 10 MHz) and modeling of such systems has drawn great attention in engineering. READ MORE

  3. 7. 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

  4. 8. Active Noise Control in Forest Machines

    University essay from Institutionen för fysik

    Author : Fredrik Forsgren; [2011]
    Keywords : Active Noise Control ANC ; Forest machine; Adaptive signal processing; Noise reduction; Adaptive filter; Feedforward; Feedback; Leaky; NLMS; FxLMS;

    Abstract : Achieving a low noise level is of great interest to the forest machine industry. Traditionally this is obtained by using passive noise reduction, i.e. by using materials for sound isolation and sound absorption. READ MORE

  5. 9. Active Noise Control of a Forest Machine Cabin

    University essay from Institutionen för systemteknik

    Author : Mårten Hedborg; Patrik Grylin; [2007]
    Keywords : Active Noise Contol; Aktiv Bullerdämpning;

    Abstract : Today, a high noise level is considered a problem in many working environments. The main reason is that it contributes to stress and fatigue. Traditional methods using passive noise control is only practicable for high frequencies. As a complement to passive noise control, active noise control (ANC) can be used to reduce low frequency noise. READ MORE