RADIATION IMPEDANCE OF TUBES WITH DIFFERENT FLANGES: NUMERICAL AND EXPERIMENTAL INVESTIGATIONS

✍ Scribed by J.-P. DALMONT; C.J. NEDERVEEN; N. JOLY

• Publisher: Elsevier Science
• Year: 2001
• Tongue: English
• Weight: 512 KB
• Volume: 244
• Category: Article
• ISSN: 0022-460X
• DOI: 10.1006/jsvi.2000.3487

✦ Synopsis

End corrections for open-ended cylindrical tubes are determined theoretically and experimentally. For the zero and low frequencies, the wave equation is solved numerically by using a "nite di!erence method. For higher frequencies the complex radiation impedance is measured and for circular #anges, calculated with the boundary element method. For low frequencies the BEM links up with the FDM and for higher frequencies "ts with experimental results. Various #anges found in particular in musical instruments are considered: circular #anges of various sizes, spherical and cylindrical #anges, square #anges, the normalised #ange (used for loudspeaker testing), short #aring horns and a disk at a certain distance above the open end. Analytical "t formulas are proposed for each case.