Experiment and modeling of vibro-acoustic response of a stiffened submerged cylindrical shell with force and acoustic excitation

Based on precise transfer matrix method (PTMM), the analytical model of the double-walled steel cylindrical shell was setup by taking into account of the annular plate and interlayer water. Under the linear sweep frequency excitation or the fixed frequency excitation, an experimental model of the double-walled steel cylindrical shell has been designed, which is performed to gain the natural frequencies, forced vibration in air and water, underwater acoustic radiation. The analytical model was established to calculate natural frequencies, vibration acceleration level and sound pressure level and compare with the relevant experimental results. The compared results show that analytical results coincide with the experimental value and prove that the analytical model established by PTMM is reliable and credible. Meanwhile, the forced vibration behaviour of measuring positions at inner and outer shells was investigated both theoretically and experimentally. Effects of different types of external excitations on the vibration and sound radiation of the double-walled cylindrical shell are discussed. As to acoustic radiation, the acoustic excitation plays a leading role in the low-frequency range. The force excitation is a major contributor in middle-high frequency range conversely. Keywords Double-walled cylindrical shellsꞏ Sound source excitationꞏ Acoustic radiationꞏ Vibration IntroductionAs a general structural configuration, steel cylindrical shells have been widely applied to the design and manufacturing of marine, aerospace and automotive engineering. The excessive dynamic responses of steel cylindrical shells subjected to different loads greatly affect the safety, comfort and health. Due to their superior mechanical and acoustical performance, double-walled steel cylindrical shells are widely applied in Chinese and Russian submarines to realize the insulation and control of vibration and sound radiation. A reliable assessment Xian-Zhong Wang

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“…When kr is a real number, G k r k x can be obtained according to the solution procedure from literature (Wang et al 2018).…”

Section: The Vibro-acoustic Responsesmentioning

confidence: 99%

“…Based on the precise transfer matrix method (Wang et al 2018), the analytical model is improved by taking into consideration of annular plate and interlayer water. Firstly, the field transfer relationship between the inner and outer ends of the annular plate is the first time obtained to construct the interactions between the inner and outer shells in PTMM.…”

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confidence: 99%

An Experimental and Modeling Study on Vibro-Acoustic Response of Double-Walled Steel Cylindrical Shells

Wang

Chen

et al. 2020

Int J Steel Struct

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“…The sound field solution was based on the Helmholtz integral. Wang and their colleagues [15][16][17][18] have conducted extensive studies on the vibration response of single-shell structures and coupled shell structures, extended the exact transfer matrix method (PTMM), calculated the vibration response and sound radiation of ring-rib cylindrical shells under light and heavy fluids within [1,3k] Hz, and studied the relationship between the peak sound pressure and the natural frequency of the structure. Based on the energy method, Jin et al [19] studied the external response and acoustic radiation of a conecylindrical-hemispherical coupled shell with bulkhead and ring ribs in a heavy fluid and verifies the effectiveness of the proposed method by comparing it with the finite element results.…”

Section: Introductionmentioning

confidence: 99%

Vibro-Acoustic Analysis of an Underwater Cylindrical Shell with Internal Structures and a Comparison with Experiment

Chen,

Li,

Chen

2023

J. Mod. Mech. Eng. Technol.

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In this work, the low-frequency vibration response and full-band acoustic radiation characteristics of an underwater reinforced cylindrical shell with internal structures are studied by combining the FEM with SEA. The stiffened cylindrical shell contains internal structures such as the F-shape plates and the support valve frames. The exciting sources have two different exciting forces corresponding to two experimental conditions. In the low-frequency band, the FEM was employed, and in the medium and high-frequency bands, the SEA was used. A comparison of the numerical results and the experiment shows that they agree well. The FEM and SEA give better results at [1,1k] Hz and [1k,10k] Hz, respectively. Due to mesh quality limitations, the FEM is not favorable for medium and high-frequency calculations. The SEA focuses on the structural mean power flow but cannot obtain position-specific vibrational responses. The results show that the internal excitation source mainly causes the structural vibration and sound radiation and are closely related to the free vibration characteristics of the structure. In addition, with the increase in frequency, the circumferential sound pressure level of the underwater structure has more substantial directivity.

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A unified prediction solution for vibro-acoustic analysis of composite laminated elliptical shells immersed in air

Guan

Zhong

Qin

et al. 2021

J. Cent. South Univ.

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Experiment and modeling of vibro-acoustic response of a stiffened submerged cylindrical shell with force and acoustic excitation

Cited by 25 publications

References 26 publications

An Experimental and Modeling Study on Vibro-Acoustic Response of Double-Walled Steel Cylindrical Shells

An Experimental and Modeling Study on Vibro-Acoustic Response of Double-Walled Steel Cylindrical Shells

Vibro-Acoustic Analysis of an Underwater Cylindrical Shell with Internal Structures and a Comparison with Experiment

A unified prediction solution for vibro-acoustic analysis of composite laminated elliptical shells immersed in air

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