Design method for reducing the sound pressure level of punched square tubes and avoiding wind whistle defects in curtain walls

Abstract

The present disclosure relates to the field of perforated square tube noise technology, and in particular to a design method for reducing the sound pressure level of perforated square tubes and avoiding the defects of curtain wall wind whistles. The present disclosure provides a design method for reducing the sound pressure level of perforated square tubes, step one: blowing perforated square tubes in different cavity states at a wind speed of 7.2m / s, the distances between the punched side of the perforated square tube and the light noise reduction baffle are four types, namely, empty tube, 50mm, 20mm and 0mm, to determine the distance that meets the needs of the appearance design while minimizing the noise, and record the laboratory measured noise values ​​of the square tube under wind at different wind speeds. Then, the perforated square tube and noise parameters specified in step one are used to construct a curtain wall model in the software, and the noise distribution diagram of the curtain wall model under different levels of wind speed is simulated and calculated. The above design method is used to evaluate the noise impact of the curtain wall model formed by the perforated square tube on the urban sound environment under different wind speeds, while achieving the dual optimization goals of the perforated decorative curtain wall being beautiful and having relatively little impact on environmental noise.

Description

Technical Field

[0001] The present disclosure relates to the technical field of noise research methods, and in particular to a design method for reducing the sound pressure level of a perforated square tube and avoiding wind whistle defects of a curtain wall. Background Art

[0002] The decorative curtain wall of the building's exterior covers the entire building, giving us diverse enjoyment. Due to the architects' pursuit and the development of materials, the architectural decorative curtain wall with holes has been more widely used in architecture.

[0003] However, decorative building curtain walls with holes may have acoustic defects such as wind whistling in windy environments. This is especially true for perforated square tube curtain walls, which are often used to decorate building facades. The risk of wind whistling cannot be ignored. During the design process, appropriate measures need to be taken to reduce the wind whistling effect of individual components. Experimental methods are used to find the parameters of the measures to reduce the wind whistle effect. Simulation methods are also used to evaluate the impact of the curtain wall composed of multiple components with noise reduction measures on the surrounding acoustic environment. This will form a complete set of design methods for perforated square tube decorative curtain walls to reduce wind noise. Summary of the Invention

[0004] In order to solve the above technical problems or at least partially solve the above technical problems, the present disclosure provides a design method for reducing the sound pressure level of a perforated square tube and avoiding the wind whistle defect of a curtain wall.

[0005] The present disclosure provides a design method for reducing the sound pressure level of a perforated square tube. Four perforated square tubes are taken, and noise reduction baffles are set in three of the perforated square tubes. The noise reduction baffles are arranged along the axial direction of the perforated square tube and face the side with the perforations. The distances between the noise reduction baffles and the side with the perforations of the perforated square tube are set to 50 mm, 20 mm and 0 mm, respectively. Step 1: blow wind at a speed of 7.2 m / s towards the side with the perforations of the perforated square tube, and detect the noise generated by the four perforated square tubes.

[0006] The present disclosure also provides a design method for avoiding curtain wall wind whistle defects, comprising the following steps:

[0007] S1. Set up a curtain wall simulation environment, use the punched square tube and noise parameters specified in step 1 to build a curtain wall model, and input the dimensional parameters of the curtain wall model and the building surrounding environment into the simulation software;

[0008] S2. Simulate the outdoor sound field and input the acoustic parameters of various materials into the database of the simulation software according to the building materials of each interface of the acoustic model;

[0009] S3. Use wind speeds of different levels to blow towards the curtain wall model. Combined with the actual number of noise sources, input relevant parameters into the simulation software for calculation.

[0010] S4. Obtain a noise distribution diagram within the test area of ​​the noise generated by the curtain wall model being blown by wind at different levels through calculation.

[0011] Optionally, the simulation range of the outdoor sound field includes the target building and buildings within the area that have reflected sound effects on the target building.

[0012] Optionally, the target building and the buildings that have a sound reflection impact on the target building are modeled according to building layout and shape.

[0013] Optionally, the height of the horizontal receiving surface of the outdoor sound field from the ground is 1.2m-1.5m, and the receiving surface grid of the sound field adopts a square grid of 3m-10m.

[0014] Optionally, a light noise reduction baffle is provided in the perforated square tube, and the distance between the light noise reduction baffle and the perforated side of the perforated square tube is 15 mm.

[0015] Optionally, the test area is divided according to the function of the building to form different types of functional area buildings, including:

[0016] Class 0 sound environment functional area refers to the area where rehabilitation and recuperation require quietness;

[0017] Class 1 acoustic environment functional areas refer to areas with residential, medical and health, cultural and educational, scientific research and design, and administrative offices as their main functions, which need to be kept quiet;

[0018] Category 2 acoustic environment functional areas refer to areas with commercial finance, market trade as the main functions, or mixed residential, commercial and industrial areas where residential quietness needs to be maintained;

[0019] Category 3 acoustic environment functional zones refer to areas where industrial production, warehousing and logistics are the main functions and where it is necessary to prevent industrial noise from affecting the surrounding environment;

[0020] Category 4 acoustic environment functional zones refer to areas within a certain distance on both sides of traffic arteries where it is necessary to prevent traffic noise from having a serious impact on the surrounding environment.

[0021] Optionally, the four types of sound environment functional zones also include type 4a sound environment functional zones and type 4b sound environment functional zones; type 4a sound environment functional zones are expressways, first-class highways, second-class highways, urban expressways, urban main roads, urban secondary roads, ground sections of urban rail transit and areas on both sides of inland waterways; type 4b sound environment functional zones are areas on both sides of railway trunk lines.

[0022] Optional,

[0023] The equivalent noise level limit for Class 0 acoustic environment functional areas is 50dB during the day and 40dB at night;

[0024] The equivalent noise level limit for Class 1 acoustic environment functional areas is 55dB during the day and 45dB at night;

[0025] The equivalent noise level limit for Class 2 acoustic environment functional areas is 60dB during the day and 50dB at night;

[0026] The equivalent noise level limit for Category 3 acoustic environment functional areas is 65dB during the day and 55dB at night;

[0027] The equivalent noise level limit for Class 4a acoustic environment functional areas is 70dB during the day and 55dB at night;

[0028] The equivalent noise level limit for Class 4b acoustic environment functional areas is 70dB during the day and 60dB at night.

[0029] Optionally, the wind speed includes five wind speeds: 6 m / s, 9 m / s, 12 m / s, 16 m / s and 20 m / s.

[0030] The technical solution provided by the embodiments of the present disclosure has the following advantages over the prior art:

[0031] The present disclosure provides a design method for reducing the sound pressure level of perforated square tubes and avoiding the defects of curtain wall wind whistles. Step 1: blow perforated square tubes with different cavity states at a wind speed of 7.2m / s. The distances between the punched side of the perforated square tube and the light noise reduction partition are four types: empty tube, 50mm, 20mm and 0mm. Determine the distance that meets the needs of the appearance design while minimizing the noise, and record the laboratory measured noise values ​​of the square tube under wind at different wind speeds. Then, the perforated square tube and noise parameters specified in step 1 are used to construct a curtain wall model in the software, and the noise distribution diagram of the curtain wall model under different levels of wind speed is simulated and calculated. The above design method is used to evaluate the noise impact of the curtain wall model formed by the perforated square tube on the urban sound environment under different wind speeds, while achieving the dual optimization goals of the perforated decorative curtain wall being beautiful and having a relatively small impact on environmental noise. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present disclosure and, together with the description, serve to explain the principles of the present disclosure.

[0033] In order to more clearly illustrate the embodiments of the present disclosure or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0034] Figure 1 This is a flow chart of a design method for avoiding curtain wall wind whistle defects according to an embodiment of the present disclosure. DETAILED DESCRIPTION

[0035] In order to more clearly understand the above-mentioned objectives, features and advantages of the present disclosure, the scheme of the present disclosure will be further described below. It should be noted that the embodiments of the present disclosure and the features therein can be combined with each other in the absence of conflict.

[0036] In the following description, many specific details are set forth to facilitate a full understanding of the present disclosure, but the present disclosure may also be implemented in other ways different from those described herein; it is obvious that the embodiments in the specification are only part of the embodiments of the present disclosure, rather than all of the embodiments.

[0037] The present disclosure provides a design method for reducing the sound pressure level of a perforated square tube. Four perforated square tubes are taken, and light noise reduction baffles are set in three of the perforated square tubes. The light noise reduction baffles are set along the axial direction of the perforated square tube and face the side with the perforations. The distances between the light noise reduction baffles and the side with the perforations of the perforated square tube are set to 50 mm, 20 mm, and 0 mm, respectively. Step 1: Blow the perforated square tube at a wind speed of 7.2 m / s to the side with the perforations, detect the noise generated by the four perforated square tubes, determine the distance that meets the design requirements and minimizes the noise, and record the laboratory measured noise values ​​of the square tube under different wind speeds. The test results are shown in Table 1:

[0038] Table 1 Frequency characteristics of noise sound pressure levels in different cavities of perforated square tubes

[0039]

[0040] According to the test results, the conclusions are:

[0041] When the perforated square tube is blown at a wind speed of 7.2m / s, the air pipe noise is the highest. The noise is the lowest in the limit state when the punching distance is 0mm from the lighting noise reduction baffle. The smaller the cavity, the lower the noise. Considering that a certain distance needs to be reserved between the holes on the surface of the square tube and the lighting noise reduction baffle, a minimum of 15mm is reserved inside the square tube to arrange the lighting equipment.

[0042] The present disclosure also provides a design method for avoiding curtain wall wind whistle defects, comprising the following steps:

[0043] S1. Set up a curtain wall model simulation environment, use the punched square tube and noise parameters specified in step 1 to build a curtain wall model, and input the dimensional parameters of the curtain wall model and the building surrounding environment into the simulation software;

[0044] S2. Simulate the outdoor sound field and input the acoustic parameters of various materials into the database of the simulation software according to the building materials of each interface of the acoustic model;

[0045] S3. Use wind speeds of different levels to blow towards the curtain wall model. Combined with the actual number of noise sources, input relevant parameters into the simulation software for calculation.

[0046] S4. Obtain a noise distribution diagram within the test area of ​​the noise generated by the curtain wall model being blown by wind at different levels through calculation.

[0047] The above design method is used to evaluate the noise impact of the curtain wall model formed by perforated square tubes on the urban acoustic environment under different wind speed conditions, while achieving the dual optimization goals of beautiful perforated decorative curtain walls and relatively small impact on environmental noise.

[0048] The design method for avoiding curtain wall wind whistle defects in this embodiment is not only applicable to curtain wall wind whistle design in outdoor square environments, but also to curtain wall wind whistle design in other scenarios.

[0049] In this embodiment, the outdoor sound field simulation encompasses the target building and any buildings within the area that reflect sound from it. The target building and its surrounding environment are modeled at a 1:1 scale, ensuring a minimal error between the experimental data generated by the simulation software and the actual noise distribution, thus guaranteeing optimal simulation results.

[0050] The coverage of the building ground must meet the requirements of the calculation domain. In addition, the building should not be placed in an open or groundless environment.

[0051] In this embodiment, the target building and the buildings that have a sound reflection effect on the target building are modeled according to the building layout and shape. The modeling process requires precise modeling, and the constructed model is completely consistent with the actual target building.

[0052] When setting parameters in the simulation software, the horizontal receiving surface of the outdoor sound field is 1.2m-1.5m above the ground, and the receiving surface grid of the sound field adopts a 3m-10m square grid.

[0053] Through experiments and manufacturer's process, we finally selected the perforated square tube with a minimum distance of 15mm from the punching of the lighting noise reduction partition. We reserved 15mm and carried out noise tests at various wind speeds.

[0054] The square tube used in this experiment is an aluminum profile square tube.

[0055] In this embodiment, the test area is divided according to the function of the building to form different types of functional area buildings, including:

[0056] Class 0 sound environment functional area refers to areas where rehabilitation and recuperation require special quietness;

[0057] Class 1 acoustic environment functional areas refer to areas with residential, medical and health, cultural and educational, scientific research and design, and administrative offices as their main functions, which need to be kept quiet;

[0058] Category 2 acoustic environment functional areas refer to areas with commercial finance, market trade as the main functions, or mixed residential, commercial and industrial areas where residential quietness needs to be maintained;

[0059] Category 3 acoustic environment functional zones refer to areas where industrial production, warehousing and logistics are the main functions and where it is necessary to prevent industrial noise from having a serious impact on the surrounding environment;

[0060] Category 4 acoustic environment functional zones refer to areas within a certain distance on both sides of traffic arteries where it is necessary to prevent traffic noise from having a serious impact on the surrounding environment.

[0061] Among them, the four types of sound environment functional zones also include type 4a sound environment functional zones and type 4b sound environment functional zones; type 4a sound environment functional zones are expressways, first-class highways, second-class highways, urban expressways, urban main roads, urban secondary roads, ground sections of urban rail transit and areas on both sides of inland waterways; type 4b sound environment functional zones are areas on both sides of railway trunk lines.

[0062] Noise equivalent sound level limits for various acoustic environment functional zones:

[0063] The equivalent noise level limit for Class 0 acoustic environment functional areas is 50dB during the day and 40dB at night;

[0064] The equivalent noise level limit for Class 1 acoustic environment functional areas is 55dB during the day and 45dB at night;

[0065] The equivalent noise level limit for Class 2 acoustic environment functional areas is 60dB during the day and 50dB at night;

[0066] The equivalent noise level limit for Category 3 acoustic environment functional areas is 65dB during the day and 55dB at night;

[0067] The equivalent noise level limit for Class 4a acoustic environment functional areas is 70dB during the day and 55dB at night;

[0068] The equivalent noise level limit for Class 4b acoustic environment functional areas is 70dB during the day and 60dB at night.

[0069] In this embodiment, different wind speeds include 6m / s (level 4 wind), 9m / s (level 5 wind), 12m / s (level 6 wind), 16m / s (level 7 wind) and 20m / s (level 8 wind). The laboratory measured noise data of aluminum profile square tubes are obtained at the above five wind speeds.

[0070] In this experiment, the curtain wall model was blown at a wind speed of 6m / s (Force 4 wind). The simulation results showed that the noise level in the area near the curtain wall model was approximately 49-52dBA, and the noise level in most of the test area was approximately 48-51dBA. This meets the acoustic environment noise limit for Class 0 areas.

[0071] The curtain wall model was blown at a wind speed of 9m / s (force 5 wind). The simulation results showed that the noise level in the area near the curtain wall model was approximately 54-56dBA, and the noise level in most test areas was approximately 49-52dBA. This meets the acoustic environment noise limit for Class 1 areas.

[0072] The curtain wall model was blown at a wind speed of 12m / s (force 6 wind). The simulation results showed that the noise level in the area near the curtain wall model was approximately 56-59dBA, and the noise level in most test areas was approximately 50-53dBA. This meets the acoustic environment noise limit for Class 2 areas.

[0073] The curtain wall model was blown at a wind speed of 16m / s (force 7 wind). The simulation results showed that the noise level in the area near the curtain wall model was approximately 63-66dBA, and the noise level in most test areas was approximately 52-55dBA. This meets the acoustic environment noise limit for Category 3 areas.

[0074] The curtain wall model was blown at a wind speed of 20m / s (force 8 wind). The simulation results showed that the noise level in the area near the curtain wall model was approximately 66-69dBA, and the noise level in most test areas was approximately 55-58dBA. This meets the acoustic environment noise limit for Class 4a areas.

[0075] Through the above simulation process, we can obtain the noise impact of the curtain wall formed by perforated square tubes on the urban acoustic environment under different wind speed conditions. Then, combined with meteorological data from previous years, we can predict the noise distribution of the target building at a specific time.

[0076] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, article, or device comprising a series of elements includes not only those elements, but also other elements not explicitly listed, or elements inherent to such process, method, article, or device. In the absence of further limitations, an element defined by the phrase "comprising a ..." does not exclude the presence of other identical elements in the process, method, article, or device comprising the element.

[0077] The foregoing description is intended only to provide specific embodiments of the present disclosure, intended to enable those skilled in the art to understand and implement the present disclosure. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present disclosure. Therefore, the present disclosure is not intended to be limited to the embodiments described herein, but rather to be construed in the broadest manner consistent with the principles and novel features disclosed herein.

Claims

1. A design method for avoiding curtain wall wind whistle defects, characterized in that: The following steps are involved: S0. Take four perforated square tubes and install light noise reduction baffles in three of them. The light noise reduction baffles are arranged axially along the perforated square tubes and face the side with the perforations. The distances between the light noise reduction baffles and the side of the perforated square tube with the perforations are set to 50 mm, 20 mm, and 0 mm, respectively. Step 1: Blow wind at a speed of 7.2 m / s toward the side of the perforated square tube with the perforations, detect the noise generated by the four perforated square tubes, and record the measured noise data of the perforated square tubes at different wind speeds. S1. Setting a curtain wall simulation environment, constructing a curtain wall model using the perforated square tube and noise parameters specified in step 1, and inputting the dimensional parameters of the curtain wall model and the building surrounding environment into the simulation software, wherein the curtain wall model is the target building, the building surrounding environment is the buildings within the area that has a sound reflection effect on the target building, and the dimensional parameters include the external dimensions of the building; S2. Simulating an outdoor sound field by inputting acoustic parameters of various materials into a database of the simulation software according to the building materials of each interface of the acoustic model, wherein the simulation range of the outdoor sound field includes the target building and buildings within the area where reflected sound affects the target building; S3. Using wind speeds of different levels to blow toward the curtain wall model, and combining the actual number of noise sources, inputting relevant parameters into the simulation software for calculation, wherein the relevant parameters are parameters set in the simulation software, including a height parameter of the horizontal receiving surface of the outdoor sound field from the ground, a size parameter of the receiving surface grid of the sound field, and a wind speed parameter; S4. Obtaining, by calculation, a noise distribution diagram of the noise generated by the curtain wall model when the wind speeds at different levels blow therethrough in the test area.

2. The design method for avoiding curtain wall wind whistle defects according to claim 1 is characterized in that: The target building and the buildings that have a sound reflection effect on the target building are modeled according to the building layout and shape.

3. The design method for avoiding curtain wall wind whistle defects according to claim 1 is characterized in that: The height of the horizontal receiving surface of the outdoor sound field from the ground is 1.2m-1.5m, and the receiving surface grid of the sound field adopts a square grid of 3m-10m.

4. The design method for avoiding curtain wall wind whistle defects according to claim 1 is characterized in that: A light noise reduction baffle is provided in the perforated square tube, and the distance between the light noise reduction baffle and the perforated side of the perforated square tube is 15 mm.

5. The design method for avoiding curtain wall wind whistle defects according to claim 1 is characterized in that: The test area is divided according to the function of the building to form different types of functional area buildings, including: Class 0 sound environment functional area refers to the area where rehabilitation and recuperation require quietness; Class 1 acoustic environment functional areas refer to areas with residential, medical and health, cultural and educational, scientific research and design, and administrative offices as their main functions, which need to be kept quiet; Category 2 acoustic environment functional areas refer to areas with commercial finance, market trade as the main functions, or mixed residential, commercial and industrial areas where residential quietness needs to be maintained; Category 3 acoustic environment functional zones refer to areas where industrial production, warehousing and logistics are the main functions and where it is necessary to prevent industrial noise from affecting the surrounding environment; Category 4 acoustic environment functional zones refer to areas within a certain distance on both sides of traffic arteries where it is necessary to prevent traffic noise from having a serious impact on the surrounding environment.

6. The design method for avoiding curtain wall wind whistle defects according to claim 5 is characterized in that: The four types of sound environment functional zones also include type 4a sound environment functional zones and type 4b sound environment functional zones; type 4a sound environment functional zones include expressways, first-class highways, second-class highways, urban expressways, urban main roads, urban secondary roads, ground sections of urban rail transit, and areas on both sides of inland waterways; type 4b sound environment functional zones include areas on both sides of railway trunk lines.

7. The design method for avoiding curtain wall wind whistle defects according to claim 6, characterized in that: The equivalent noise level limit for Class 0 acoustic environment functional areas is 50 dB during the day and 40 dB at night; The equivalent noise level limit for Class 1 acoustic environment functional areas is 55 dB during the day and 45 dB at night; The equivalent noise level limit for Class 2 acoustic environment functional areas is 60 dB during the day and 50 dB at night; The equivalent noise level limit for Category 3 acoustic environment functional areas is 65dB during the day and 55dB at night; The equivalent noise level limit for Class 4a acoustic environment functional areas is 70 dB during the day and 55 dB at night; The equivalent noise level limit for Class 4b acoustic environment functional areas is 70dB during the day and 60dB at night.

8. The design method for avoiding curtain wall wind whistle defects according to claim 1 is characterized in that: The wind speeds include five types: 6 m / s, 9 m / s, 12 m / s, 16 m / s and 20 m / s.

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