» Home » Search

Search WoM

Fields:

Export resources

You have chosen to export the information about resources from the result of your search for 'acoustics' as a netscape bookmark file.

This data can be downloaded and then, e.g., be imported in your browser.

Search Results

We found 1 Resources matching acoustics

Showing 10 20 30 50 100 items per page
Sort by:
  • Second Order Correction of Acoustic Helmholtz Equation

    Views: 163 Average Rating:
    •  
    If a strong sinusoidal signal is sent to a vented bass loudspeaker we will hear not only the fundamental frequency, but also higher harmonics. This nonlinear distortion is partially due to the response of the electro-mechanical components and partially due to the transfer behavior of the enclosed air. Here, we deal with the latter effect. It is well known that the edges of reflex tubes have to be chamfered to avoi...
    Tags: acousticsasymptotic_analysishelmholtzhelmholtz_equationnon_linear_acoustics
    Added by Martin on 2011-07-12 15:52


    Second Order Correction of Acoustic Helmholtz Equation If a strong sinusoidal signal is sent to a vented bass loudspeaker we will hear not only the fundamental frequency, but also higher harmonics. This nonlinear distortion is partially due to the response of the electro-mechanical components and partially due to the transfer behavior of the enclosed air. Here, we deal with the latter effect. It is well known that the edges of reflex tubes have to be chamfered to avoid noise. The present model is designed to investigate this phenomenon with minimal numerical costs . Obviously, linear acoustics are insufficient. Solving the full Euler equations, however, requires an unreasonably high effort. Therefore, we propose a correction to the linear Helmholtz equation which consists just in a second inhomogeneous Helmholtz equation for the first harmonic and an algebraic equation for the radiation pressure. For medium displacements it allows to predict how the energy inserted into the loudspeaker at a given frequency is distributed between the keynote and the first harmonic.