A5008802473- Acoustic Wave Phenomena Research
- Advanced Adaptive Filtering Techniques
- Wind and Air Flow Studies
- Geophysical and Geoelectrical Methods
- Aerodynamics and Acoustics in Jet Flows
- Music and Audio Processing
- Hearing Loss and Rehabilitation
- Magnetic Properties and Applications
- Seismic Imaging and Inversion Techniques
- Aeroelasticity and Vibration Control
- Music Technology and Sound Studies
Technical University of Denmark
2023-2024
Ørsted (Denmark)
2023
Sound field control can be applied to the problem of reducing noise emissions from outdoor live music events. One method employed in this type applications is pressure matching. Different approaches used find a solution problem. Many these methods provide reduction more than 10 dB frequency range subwoofer, between 30 and 120 Hz, thus loudness half original. Such performance adequate, but it comes with drawbacks and/or practical limitations such as side lobes that create new problems areas,...
Simulations are widely used to predict noise emissions from traffic, railroad, aircraft, and wind farms for sound field control. The latter employs multiple sources interacting it requires accurate phase information. Acoustic models require precise characterization of the medium properties. logarithmic profile is one most commonly forms model speed. However, this only in neutral conditions, i.e., when there not heat flux at surface. conventionally boundary layer (CNBL) frequently occurring...
In outdoor sound propagation, the variation of wind speed with height plays an important role and a logarithmic profile is often assumed.This accurate description in neutral boundary layer according to MOST.However, can be either truly or conventionally depending on stability condition at top ABL.While suitable regime, more commonly found.This regime characterized by stable stratification aloft that result super geostrophic close ABL higher steeper gradient ground than predicted profile.This...
In sound field control, a set of control sources is used to match the pressure generated by noise but with opposite phase reduce total level in defined area commonly referred as dark zone. This usually an ill-posed problem. The approach presented here employs subspace iterative method where number iterations acts regularization parameter and controls unwanted side radiation, i.e. lobes. More lead less more controlled problem-specific stopping criteria. Simulations show increase lobing...