The invention provides a statistical energy analysis parameter acquisition method based on a finite element method and a power input method. A finite element model of a structure is established according to a geometric model of the structure, boundary conditions are applied, the finite element model of the structure is subjected to mode analysis, a mode of a system and a rigidity matrix and a mass matrix of a subsystem are obtained, vibration energy of the subsystem and input power of the system are obtained through a power flow model, and statistical energy analysis parameters are obtained through calculation through the power input method. The finite element method and the power input method are combined to obtain the statistical energy analysis parameters of the structure, the calculated rigidity matrix, mass matrix, mode shape and inherent frequency are obtained through the finite element method, the input power and the vibration energy are obtained through calculation through the power flow model, and the input power and the vibration energy are substituted into the power input method for calculation to obtain the statistical energy analysis parameters. According to the method, statistical energy analysis can be carried out aiming at the problem of strong coupling between structures, the limitation about weak coupling assumption between the structures in existing statistical energy analysis is solved, and the method can be popularized to complex structures.

Statistical energy analysis parameter acquisition method based on finite element method and power input method

The invention provides a method for calculating the intermediate and high frequency dynamic response of an acoustic vibration system. The method comprises the following steps of: firstly dividing the acoustic vibration system to be researched into N subsystems; then, determining analysis frequency ranges to which a modal energy analysis method and a statistical energy analysis method are applicable; when the analysis frequency is in an intermediate frequency range, calculating the intermediate frequency dynamic response of the researched acoustic vibration system by adopting the modal energy analysis method; and when the analysis frequency is in a high frequency range, calculating the high frequency dynamic response of the researched acoustic vibration system by adopting the statistical energy analysis method, wherein the modal energy analysis method comprises the following steps of: firstly determining the number of resonance modes and resonance frequency values of all the subsystems in the intermediate frequency range, and then establishing a power flow balance relationship among the resonance modes of the N subsystems, and finally solving the modal energy of each mode of all the subsystems according to the power flow balance relationship, summing the modal energy of the modes of each subsystem in an analysis frequency band so as to obtain the energy response of each subsystem in the analysis frequency band.

Method for calculating intermediate and high frequency dynamic response of acoustic vibration system

A system for reducing noise emissions in underwater environments is presented. The system can be extended to applications in any two-fluid environments where one fluid (gas) is contained in an enclosed resonator volume connected to the outside environment at an open end of the resonator body. The resonators act as gas-containing (e.g., air) Helmholtz resonators constructed into solid panels that are submerged in the fluid medium (e.g., sea water) in the vicinity of a noise generating source. The oscillations of the trapped air volume in the resonators causes reduction of certain noise energy and a general reduction in the transmitted noise in the environment of the system.

Underwater noise abatement panel and resonator structure

The invention relates to a multilayer material combined cavity anechoic tile which consists of a surface layer, a punching layer and a base layer, wherein mixed type cavity structures consisting of circular-table-shaped cavities and horn-shaped cavities are arranged in the punching layer in an arrayed manner; a punching rate of the circular-table-shaped cavities is 10-20%; a punching rate of the horn-shaped cavities is 1-2%; each mixed type cavity structure consists of one circular-table-shaped cavities and two to six horn-shaped cavities; the surface layer is made of sound transmission polyurethane elastomer; the punching layer is made of polyurethane double-layer compound foam sound absorption material; the base layer is made of butyl rubber matched with the impedance of a housing of an underwater navigation vehicle; and the surface layer, the punching layer and the base layer are glued through an adhesive sequentially, and are subjected to integrated cold-press moulding.

Multilayer material combined cavity anechoic tile

The invention discloses a train inside aerodynamic noise prediction method, which includes steps of blocking a train body surface of a train to obtain a blocked train model; performing air dynamics computation on the basis of the blocked train model and acquiring the train surface pulsating pressure; calculating vibration and sound radiation of the train body structure under the train surface pulsating pressure, and acquiring medium-low frequency aerodynamic noise and medium-high frequency aerodynamic noise; performing frequency domain combination on the medium-low frequency aerodynamic noiseand medium-high frequency aerodynamic noise and acquiring a full domain aerodynamic noise. The train inside aerodynamic noise prediction method has the advantages of effectively solving the predictionof aerodynamic noise in a high-speed train and further acquiring the property of the aerodynamic noise in the high-speed train in a full domain. The invention further discloses a train and a computerreadable storage medium, which also has the beneficial effect as above.

Train inside aerodynamic noise prediction method and a train

The invention relates to a porous rubber material member The member comprises a thin covering layer and a hole sound absorption layer which are integrated and made of a rubber material, wherein holes of the hole sound absorption layer are blind holes The hole condition of the porous rubber material member is different from that of the common porous sound insulation material; in order to exert asound absorption function, air holes of the common porous material are open and intercommunicated, and sound absorption property is higher when the number of the air holes is larger; the blind holes are directly and vertically punched on a rubber plate, so the porous rubber material member is suitable for vibration reduction and sound insulation in an air medium, and meets the requirement of certain pressure resistance when underwater equipment works in a deep water area; movement resistance can be reduced because the porous rubber material member has smooth appearance; in addition, the hole sound absorption layer and the thin covering layer are combined to form a composite structure, so the porous rubber material member has high sound absorption and sound insulation properties

Porous rubber material member and full-frequency range vibration acoustical property analysis method thereof

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Porous rubber material member and full-frequency range vibration acoustical property analysis method thereof