Vibroacoustic Analysis of a Finite Cylindrical Shell With Internal Floor Partition

Analysis of Structural Acoustic Coupling of a Cylindrical Shell With an Internal Floor Partition

“…The one used in the present work was experimentally validated in our previous work [20]. Basically, the cavity was formed by a steel cylinder with a #oor welded to the inner shell skin.…”

“…The criteria are the same as those used in our previous work [20]. By a careful convergence study, the number of terms in decomposition series is determined as follows: shell: (8, 10) (longitudinal, circumferential), #oor: (8,5,5) (transversal, in-plane motion in x, y), cavity: (5,5,5) (longitudinal, circumferential, radial).…”

“…Detailed expressions for each term can be found in reference [20]. The coupling matrix is symmetrical in which each non-zero term indicates the coupling between two di!erent motions.…”

“…The existence of the #oor produces two e!ects on the sound "eld: one is its direct sound radiation, the other is its changing cavity shape from a regular one to an irregular one. Our previous work [20] has shown that when excitation is applied to the shell, the sound radiation from the #oor becomes weak because of the small vibration of the #oor. Therefore, the analysis of the sound radiation from the shell will be emphasized herein.…”

Vibration Transmission of a Cylindrical Shell with an Interior Rectangular Plate with the Receptance Method

“…Missaoui et al [10] investigated free and forced vibration of a cylindrical shell with a floor partition based on a variation formulation in which the structural coupling was simulated with an artificial spring system. Missaoui and Cheng [11] and Li et al [12] presented findings on the structural acoustic coupling characteristics of a cylindrical shell with an internal floor partition. Missaoui also pointed out that the receptance method might be difficult to exploit for a shell partitioned by a longitudinal floor since no information on forces distributing along the joint is priori available.…”