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Integrated mathematical modeling method for cavity noise generation and propagation law

A cavity noise and mathematical modeling technology, which is applied in the fields of electrical digital data processing, design optimization/simulation, special data processing applications, etc. Simulation ability, the effect of improving research efficiency

Active Publication Date: 2018-07-20
INST OF HIGH SPEED AERODYNAMICS OF CHINA AERODYNAMICS RES & DEV CENT
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to provide an integrated mathematical modeling method for the generation and propagation of cavity noise, so as to solve the deficiency of the existing technology for the integrated analysis of the generation and propagation of cavity noise

Method used

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  • Integrated mathematical modeling method for cavity noise generation and propagation law
  • Integrated mathematical modeling method for cavity noise generation and propagation law
  • Integrated mathematical modeling method for cavity noise generation and propagation law

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Embodiment 1

[0061] The present invention is realized through the following technical solutions, an integrated mathematical modeling method for the generation and propagation of cavity noise, which is characterized in that it specifically includes the following steps:

[0062] Step S1: Establish the key influencing parameters of the cavity noise problem and the characterization parameter system of the cavity noise problem;

[0063] Step S2: Establish and simplify the governing equation of the compressible flow in the cavity;

[0064] Step S3: Establish an integrated mathematical modeling equation for the generation and propagation of cavity noise; establish an integrated mathematical modeling equation for the generation and propagation of cavity noise, which can fundamentally ensure the correctness of the established equation;

[0065] Step S4: Establishing cavity aeroacoustic boundary conditions, and obtaining control equations of cavity aeroacoustic wall conditions and cavity aeroacousti...

Embodiment 2

[0068] This embodiment is further optimized on the basis of the above embodiments. Further, in order to better realize the present invention, the step S1 specifically refers to: establishing the key influencing parameters of the cavity noise problem by analyzing the basic law of the cavity flow System; according to the characteristic of cavity aeroacoustics, establish the characteristic parameter system of cavity noise problem;

[0069] The key influencing parameter system specifically includes cavity geometric parameters and flow condition parameters;

[0070] The cavity geometric parameters include cavity length L, cavity depth D and cavity width W;

[0071] The incoming flow condition parameters include the incoming flow medium pressure p s , density of incoming medium ρ s , incoming medium temperature T s , the viscosity of the incoming medium μ, the specific heat ratio of the incoming medium γ, the thermal conductivity of the incoming medium k s , Constant volume spec...

Embodiment 3

[0110] This embodiment is the best embodiment of the present invention: an integrated mathematical modeling method for the generation and propagation of cavity noise, which specifically includes the following steps:

[0111] Step S1: establishing the key influencing parameters of the cavity noise problem and the characterization parameter system of the cavity noise problem; the step S1 specifically refers to: establishing the key influencing parameter system of the cavity noise problem by analyzing the basic law of the cavity flow; According to the characteristics of cavity aeroacoustics, the characterization parameter system of cavity noise problem is established;

[0112] The key influencing parameter system specifically includes cavity geometric parameters and flow condition parameters;

[0113] The cavity geometric parameters include cavity length L, cavity depth D and cavity width W;

[0114] The incoming flow condition parameters include the incoming flow medium pressur...

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Abstract

The invention discloses an integrated mathematical modeling method for a cavity noise generation and propagation law. The method comprises the following steps of step S1, establishing a key influenceparameter of a cavity noise problem and a characterization parameter system of the cavity noise problem; step S2, establishing and simplifying a cavity compressible flow control equation; step S3, establishing an integrated mathematical modeling equation for cavity noise generation and propagation; step S4, establishing cavity aeroacoustic boundary conditions to obtain cavity aeroacoustic wall surface conditions and a governing equations for cavity aeroacoustic far field conditions. The method has the advantages that the integrated mathematical modeling equation of the cavity noise generationand propagation law is established, the correctness of the established equation can be ensured fundamentally, and the method is beneficial for grasping the essence and key parameters of a cavity noisegeneration and propagation coupling problem, has positive guiding effects on experiments and numerical researches of cavity noise researches, improves the research efficiency of a cavity noise problem, and lays a theoretical foundation for comprehensive analysis of a cavity noise generation and propagation mechanism.

Description

technical field [0001] The invention relates to the interdisciplinary technical fields of aerodynamics and aeroacoustics, and specifically relates to an integrated mathematical modeling method for cavity noise generation and propagation laws. Background technique [0002] Cavity-type structural layouts are common in engineering applications, such as buried weapon compartments, aircraft landing gear compartments, high-speed railway car connection areas, etc.; under high-speed incoming flow conditions, flow-induced oscillations are prone to occur in the cavity, resulting The internal noise environment is harsh. On the one hand, the cavity noise is likely to cause structural vibration of the cavity panel, accelerate the fatigue and damage of the cavity panel, and even cause structural resonance of the cavity panel and cause a safety accident; on the other hand, the cavity noise After it is generated, it will spread to the space, resulting in an increase in the noise intensity i...

Claims

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Application Information

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IPC IPC(8): G06F17/50
CPCG06F30/20G06F2119/10
Inventor 王显圣杨党国刘俊周方奇施傲杨野
Owner INST OF HIGH SPEED AERODYNAMICS OF CHINA AERODYNAMICS RES & DEV CENT
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