Quantitative calculation method and system for underwater acoustic radiation of complex composite shell structures

Abstract

The invention discloses a quantitative calculation method and system for underwater acoustic radiation of a complex composite structure, wherein the method includes the following steps: obtaining the structural parameters and excitation parameters of the composite shell system in the fluid medium; according to the obtained structural parameters and excitation parameters, in Collocate points on the surface of the composite shell along the direction of the generatrix, use the fine integration method to calculate the field transfer matrix and point transfer matrix between the collocation points of the composite shell system, and calculate the external force vector; The dynamic model of the medium-combined shell system; the vibration response of the fluid medium-combined shell system is obtained by solving the Moore-Penrose generalized inverse matrix; the underwater acoustic radiation of the conical shell-cylindrical shell-spherical shell composite structure is solved using the wave superposition method . The invention can quantitatively calculate the underwater acoustic radiation generated by the external excitation of the complex combined shell in the fluid medium, and provides reference and basis for the acoustic characteristic analysis of the underwater vehicle.

Description

technical field [0001] The invention relates to the field of structural acoustic design of ship structures, especially underwater vehicles, and specifically designs a quantitative calculation method and system for underwater acoustic radiation of complex composite structures. Background technique [0002] Vibration and noise of ships has always been a research hotspot at home and abroad. Sea friction caused by the development and utilization of marine resources is increasing day by day. Naval powers are constantly improving the technical level of their sea and air detection equipment. The challenge, its concealment is the main factor that determines the combat effectiveness and survivability. On the one hand, the radiated noise of the ship will expose itself to the enemy; on the other hand, the sonar detection of the ship also needs to consider the noise limit. The military importance of the ship's structure-acoustic stealth performance is becoming more and more prominent. ...

AI Technical Summary

Problems solved by technology

The engineering estimation method is a forecasting method based on the summarization and induction of test data and empirical formulas under the premise of theoretical derivation and test verification. widely used

[0004] Therefore, none of the above methods can well simulate the underwater acoustic radiation of ships, especially underwater vehicles.

Moreover, there is no report on the calculation and processing methods of complex composite shell systems including structures such as spherical shells and bulkheads and fluid media.

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