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An Optimal Design Method for Plate Structures to Improve Low-Frequency Sound Insulation Performance

A technology for optimizing design and flat plate, applied in geometric CAD and other directions

Active Publication Date: 2020-10-20
HUAQIAO UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there is currently no optimal design method that can effectively guide the optimal design of the boundary conditions of flat plate structures, so as to achieve the maximum improvement of low-frequency sound insulation performance

Method used

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  • An Optimal Design Method for Plate Structures to Improve Low-Frequency Sound Insulation Performance
  • An Optimal Design Method for Plate Structures to Improve Low-Frequency Sound Insulation Performance
  • An Optimal Design Method for Plate Structures to Improve Low-Frequency Sound Insulation Performance

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0054] Embodiment 1, the specific optimization steps are as follows:

[0055] Step 1. Establish the calculation equation for the sound transmission loss of the plate structure applicable to any boundary conditions:

[0056]

[0057] Among them, TL is the sound transmission loss of the plate structure, {δ} is the node displacement vector matrix, and ω is the natural angular frequency. is the global transformation matrix, which can convert the unit load pressure into the equivalent nodal force; is the global transformation matrix, which can convert the nodal displacement into lateral deflection; {P 0} is the incident acoustic wave matrix acting on the inner surface of the plate, {M}, {C} and {K} are the overall mass matrix, damping matrix and overall stiffness matrix of the plate structure respectively, which can be obtained by the finite element method, as follows: {M } by the equivalent mass matrix of the plate element {M p} e Composed of, {K} consists of the equivalen...

Embodiment 2

[0112] Step 1. Establish the calculation equation of the sound transmission loss of the plate structure applicable to any boundary conditions;

[0113] Step 2. Set various known parameters, wherein the incident sound wave is a vertical incident sound wave (that is, the incident direction of the incident sound wave is consistent with the normal direction of the flat plate structure), and other specific parameter values ​​are shown in Table 5 below:

[0114]

[0115] Table 5 known parameters

[0116] Step 3. Set the adjustable range of boundary parameters, as shown in the table below:

[0117]

[0118] Table 6 Boundary parameters

[0119] Step 4. Select LFSTC at the same time A and LFSTC O&N indicators, and establish calculation methods corresponding to these two indicators;

[0120] Step 5. According to the indicators selected in step 4, set the optimization goal of the flat plate structure as: simultaneously realize the selected LFSTC A and LFSTC O&N index value is...

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Abstract

The invention discloses a slab structure optimal design method for improving low-frequency sound insulation performance. The method comprises the steps that a calculation equation suitable for sound transmission loss of a slab structure under arbitrary boundary conditions is established, and all known parameters are set; one or more structure low-frequency sound insulation performance evaluation indexes are selected; a calculation method corresponding to the selected indexes is established; an optimization objective of the slab structure is set according to the selected indexes; if the numberof the selected indexes in the step 4 is more than 1, corresponding weights of all the indexes are set; an optimization algorithm is selected; and optimal solution search is performed according to theset known parameters, a boundary parameter adjustable range and the optimization objective to obtain optimal boundary parameters and form the slab structure. The method can guide optimal design of the boundary conditions of the slab structure, the advantages of the optimization algorithm are utilized in the design process, an optimal solution to the boundary conditions is quickly searched out, and therefore the effect of maximizing the low-frequency sound insulation performance of the slab structure is achieved.

Description

technical field [0001] The invention relates to an optimal design method of a flat panel structure for improving low-frequency sound insulation performance. Background technique [0002] The sound insulation and noise reduction characteristics of structures have always been a concern in the fields of architecture and machinery. In order to effectively evaluate the sound insulation performance of structures, a "single value evaluation" index for the sound insulation performance of structures has been proposed. For example, the sound transmission class "Sound Transmission Class" (STC) proposed by the ASTM organization, the weighted sound attenuation index "Weighted Sound Reduction Index" (Rw) proposed by the ISO International Organization for Standardization, and the sound insulation evaluation standard proposed in my country "Single Value Evaluation Quantity", etc. However, the above single-valued evaluation index does not consider the low-frequency range enough, and it is d...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06F30/13
Inventor 欧达毅
Owner HUAQIAO UNIVERSITY
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