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Optimal design method for reducing transient acoustic radiation of plate structure

A technology for optimizing design and sound radiation, applied in the direction of design optimization/simulation, calculation, instrument, etc., can solve unlikely problems, and achieve the effect of reducing transient sound radiation and realizing transient radiation sound pressure

Active Publication Date: 2019-01-01
HUAQIAO UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These difficulties have made it impossible to obtain the optimal parameters by calculating the structural properties one by one by traditional methods (such as the enumeration method).

Method used

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  • Optimal design method for reducing transient acoustic radiation of plate structure
  • Optimal design method for reducing transient acoustic radiation of plate structure
  • Optimal design method for reducing transient acoustic radiation of plate structure

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] Embodiment one (structural schematic diagram sees figure 2 and image 3 ) The specific optimization steps are as follows:

[0041] Step 1. Based on the time-domain finite element-boundary element coupling method, establish a theoretical calculation equation for the transient sound radiation of a flat plate structure suitable for any boundary conditions:

[0042]

[0043] The derivation of the above formula is based on the time-domain finite element-boundary element coupling method, where SPL max is the maximum instantaneous radiated sound pressure level of the flat plate structure, p(ξ,t) is the instantaneous radiated sound pressure at ξ position at time t; S p is the plate area, ρ 0 is the air density, x is the coordinates of the plate nodes, c is the speed of sound, {R} is the transformation matrix, which is used to convert the node displacement of the plate structure into the transverse deflection, δ is the Dirac function, is the instantaneous nodal accelera...

Embodiment 2

[0087] Step 1. Based on the time-domain finite element-boundary element coupling method, establish a theoretical calculation equation for the transient sound radiation of a flat plate structure applicable to any boundary conditions;

[0088] Step 2. Set various known parameters of the plate structure, including plate material, plate damping factor, plate size and plate thickness, and set the specific position ξ for calculating the instantaneous radiated sound pressure. In this embodiment, ξ is set at a position 1m away from the flat structure on the center normal of the flat structure; the specific parameter values ​​of the set flat structure are shown in the following table:

[0089]

[0090]

[0091] Step 3. Set the adjustable range of boundary parameters, as shown in the table below:

[0092]

[0093] Step 4. The initial state of the plate structure and the transient excitation received are given. The initial state given in this example is The center of the plat...

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Abstract

The invention provides an optimization design method for reducing transient acoustic radiation of a plate structure, which comprises the following steps: 1. using coupled boundary element method to establish the transient acoustic radiation equations of plate structures with arbitrary boundary conditions. 2, setting each known parameter of the plate structure and calculating the specific positionof the instantaneous radiated sound pressure; 3, setting the adjustable range of boundary parameters; 4, giving the initial state of the plate structure and the transient excitation; 5, selecting theoptimization algorithm, combining the transient acoustic radiation equation of plate structure with the optimization algorithm, aiming at the known parameters of plate structure, the adjustable rangeof boundary parameters, the initial state of plate structure and the transient excitation, the optimal solution being searched to obtain the optimal boundary parameters of minimizing the maximum instantaneous radiation sound pressure level SPLmax of plate structure. 6, foring a plate structure according to the optimal boundary parameter. The invention can not only keep the original structure of the plate structure, but also effectively improve the transient sound insulation and noise reduction performance.

Description

technical field [0001] The invention relates to an optimal design method for reducing the transient sound radiation of a flat structure. Background technique [0002] Flat plate structure is one of the most common structures in engineering, widely used in shipbuilding and ocean engineering, aerospace engineering, civil engineering, vehicle engineering and other structures. The transient sound radiation characteristics of flat plate structures are closely related to the overall sound insulation and noise reduction performance of the structure (especially the isolation ability to external transient excitation or transient noise). Performance plays an important role and has always attracted the attention of engineers in the fields of construction and machinery. It is well known that the boundary installation conditions of flat-plate structures have an important influence on the transient sound radiation characteristics of structures that cannot be ignored. If the optimal desi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F17/50
CPCG06F30/23G06F30/13Y02T90/00
Inventor 欧达毅
Owner HUAQIAO UNIVERSITY
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