Vibro-acoustic characteristics of rubber matrix cord-reinforced combined shells of revolution under hydrostatic pressure. (15th March 2022)

• Record Type: Journal Article
• Authors: Hua, Gao; Changgeng, Shuai; Jianguo, Ma; Yuqiang, Cheng
• Is Part Of: Applied acoustics. Volume 190(2022)
• Publication Date: 2022-03-15
• Subjects: Hydrostatic pressure -- Rubber matrix composites -- Combined shells of revolution -- Vibro-acoustic characteristics -- Precise transfer matrix method; Acoustical engineering -- Periodicals; Periodicals; 620.2
• DOI: 10.1016/j.apacoust.2022.108642
• Languages: English
• ISSNs: 0003-682X

Abstract

Highlights: The deformation and stress of the rubber matrix composite shell is considered into the differential equation of motion. Considering the fluid–solid coupling boundary condition, the continuous condition of the state vector of the shell and the transformation relationship of the coordinate system, the whole vibration equation of the fluid-filled combined shells of revolution is established. The accuracy and reliability of the proposed method are verified by the results of experiment Effects of the structural parameters on the acoustic radiation characteristics of the fluid-filled combined shells of revolution are also discussed. Abstract: The vibro-acoustic characteristics of rubber matrix cord-reinforced combined shells of revolution under hydrostatic pressure are investigated. Under internal pressure of the shell, stress and deformation is generated in the rubber matrix cord-reinforced shell. According to the deformation characteristics of the rope structure under hydrostatic pressure, the axial and circumferential deformation of the shell is discussed. The stress of shell caused by the hydrostatic pressure is considered in the differential equation of motion. Then the transformation relationships of different coordinate systems, and the continuous conditions of state vectors of the shell are established. The transfer matrices for the connection position of the spherical shell and the cylindrical shell, the position of the ring-stiffener are derived. Therefore, the whole vibration transfer equation of the combined shells is assembled. The response of the shell under the excitation force and the generalized sound pressure is calculated separately, and the sound pressure coefficient is solved by the continuous condition at the acoustic-structure coupling boundary. The radiated sound power of the combined shells is obtained. Eventually, the reliability and accuracy of the proposed method is verified by experimental results. Effects of the number of circumferential waves, radius of curvature of spherical shell, the hydrostatic pressure, the ring-stiffeners on the acoustic radiation characteristics of the combined shells are also discussed.