Modelling and analysis of acoustic field in a rectangular enclosure bounded by elastic plates under the excitation of different point force

Abstract

The coupled acoustic field of fully elastic plate model is described by the modal analysis method. The acoustic potential energy resonance peaks of the fully elastic plate model are significantly more than that of the one elastic plate model due to the influence of the vibration of multi elastic plates. The acoustic field characteristics of the fully elastic plate model are analyzed when the primary excitation source is applied on the different elastic plates. The results show that the coupled acoustic field of the fully elastic plate model is dominated by the structural mode of the elastic plate with primary excitation, and the acoustic mode of the enclosure, and the structural-acoustic coupling between the plate and the enclosure; the structure modes of the other elastic plates have less effects on the acoustic field in the enclosure except the first ones of them.

Vibro-acoustic analysis of a trapezoidal cavity with a clamped flexible wall

“…., (3,4), four more, i.e. (1,2), (1,4), (3,2), and (3,4) and cavity mode (0,2,1) when the flexible wall located at z ¼ L z have nonzero coupling coefficients for a ¼ 10 and a ¼ 45 compared with the rectangular cavity as shown in Tables 1 and 2. As for the flexible wall located at y ¼ 0, among the researched clamped Table 1.…”

“…. ., (3,4), five more, i.e. (1,1), (1,3), (1,5), (3,1), and (3,3) and cavity mode (0,2,1) have nonzero coupling coefficients for a ¼ 10 and a ¼ 45 compared with the rectangular cavity as shown in Tables 3 and 4.…”

“…When the cavity shape is changed from rectangular to trapezoidal with a ¼ 10 or a ¼ 45 , the additional cavity-controlled mode (0,1,0) is evoked. Meanwhile, the additional panel-controlled mode (3,4) and (1,4) is evoked when a ¼ 10 and a ¼ 45 , respectively. The reason is the same as mentioned above.…”

“…0.766 0.125 0.186 0.202 0.000 0.000 0.000 0.000 0.327 (1,2) 0.056 0.432 0.448 0.565 0.000 0.000 0.000 0.000 0.000 (1,3) 0.339 0.076 0.088 0.151 0.000 0.000 0.000 0.000 0.143 (1,4) 0.033 0.238 0.245 0.313 0.000 0.000 0.000 0.000 0.000 (1,5) 0…”

Modelling and Analysis of Global Vibroacoustic Coupling Characteristics of a Rectangular Enclosure Bounded by a Flexible Panel

“…As an extension of the work carried out by Pan and Bies [3] and Sung and Jan [6], Wang et al [8] analyzed the e ect of di erent variables, including panel thickness, panel internal damping, and enclosure depth, on the coupling features of the coupled system, which include resonance frequency and modal decay time. Recently, large amount work has been carried out to study the forced response of the coupled system with di erent kinds of excitation [9][10][11][12] and active noise control [12][13][14][15][16], based on the analysis of vibroacoustic coupling. However, the existing literatures are concentrated on the coupling property between a single panel mode and an enclosure mode, and the in uence of the structural parameters on the global coupling degree between multiple panel modes and multiple enclosure modes has not been considered.…”