WAVE PROPAGATION, REFLECTION AND TRANSMISSION IN TUNABLE FLUID-FILLED BEAMS

✍ Scribed by N.R. HARLAND; B.R. MACE; R.W. JONES

• Publisher: Elsevier Science
• Year: 2001
• Tongue: English
• Weight: 366 KB
• Volume: 241
• Category: Article
• ISSN: 0022-460X
• DOI: 10.1006/jsvi.2000.3316

✦ Synopsis

This paper concerns wave motion in tunable #uid-"lled beams. The beams comprise two elastic faceplates with a central core of tunable #uid such as electro-rheological or magneto-rheological #uid. Free wave propagation is considered and three wave modes are seen to exist. The corresponding wavenumbers depend on the viscoelastic properties of the tunable #uid, which in turn depend on the "eld applied to the #uid. Consequently, the wavenumbers can be controlled. A systematic technique for describing wave transmission and re#ection in one-dimensional waveguides is described. This involves transformations between wave amplitudes and waveguide displacements and internal forces. Expressions are derived which describe wave re#ection at a boundary, re#ection and transmission at a change in section and re#ection and transmission at an attachment. Numerical results are presented for electro-rheological #uid-"lled beams and the junction between such a beam and an Euler}Bernoulli beam. The re#ection and transmission coe$cients also depend on the applied "eld so that the transmission characteristics are tunable.