Industrial site noise analysis method and system

Abstract

The invention relates to the technical field of noise analysis, and discloses an industrial site noise analysis method and system, and the method comprises the steps: comparing the noise investigated in a production site with a noise spectrum range, predicting the noise level, and determining a main noise source; according to the actual situation of a production site and sensitive points of the surrounding environment, a noise reduction test is carried out on single equipment of a main noise source, and test data are counted; and on the basis of the test data, generating a scheme for treating main noise sources in different regions. According to the layout of a production site and the distribution of main noise production equipment, different treatment schemes are adopted, and partition treatment is performed in a mode of combining multiple treatment measures such as integrated sealing, sound insulation walls and sound insulation barriers, so that factory boundary noise and residential area noise are effectively ensured to be discharged in a standard reaching manner.

Description

Technical Field

[0001] The present invention relates to the technical field of noise analysis, and particularly to an industrial site noise analysis method and system. Background Art

[0002] For noise control in mineral processing enterprises, an integrated closed control method is usually adopted. However, in actual production, factors such as the enterprise's location and on-site equipment are irregularly distributed. The noise sources are widely and dispersedly distributed with multiple audio frequencies. The factory area is irregularly distributed and the sound sources are not unified, making it easy for the sound sources to be superimposed. Moreover, if the factory is surrounded by residential areas, the commonly used integrated closed measures cannot be implemented. At this time, the factory boundary noise and residential area noise cannot meet the standards or cannot meet the emission standards simultaneously. If the segmented and zoned control is not coordinated and the measures are not properly utilized, the overall control effect will be affected, and it is easy to cause a situation where one side meets the standards while the other side exceeds the standards, easily putting the enterprise into a vicious cycle of control work and failing to achieve the goal of meeting the emission standards.

[0003] For example: The patent document with the application publication number CN107066716A discloses "A Community Noise Reduction Optimization Method", including: collecting noise data; constructing a calculation model and using acoustic simulation software for environmental noise prediction; noise value calculation: calculating the noise attenuation near the noise point according to the acoustic simulation software to determine the noise impact value received by the community; using finite element analysis software, importing each noise point and the community location into the same CAD layer and displaying them intuitively; determining the community layout according to the noise impact value or setting the position of the sound barrier.

[0004] For example: The patent document with the application publication number CN115712979A discloses "A Method for Analyzing Noise in the Workplace", including: S1, conducting on-site investigations and actual measurements on the noise pollution situation in the workplace; S2, determining the engineering noise reduction amount for workplace noise analysis according to the actual measurement results, national laws, regulations and standards systems, and the actual workplace noise analysis requirements of the employer; S3, adopting a noise simulation method to carry out simulation of the workplace noise analysis plan, and determining the optimal workplace noise engineering analysis plan according to the simulation prediction results; S4, constructing and transforming according to the workplace noise engineering analysis plan; S5, organizing the acceptance or technical appraisal of the workplace noise reduction effect.

[0005] For example: The patent document with the application publication number CN116665632A discloses "An Optimization Method for Noise Analysis Based on Sound Barriers", including: investigating the noise pollution sources; determining the noise position and the situation of the noise propagation path; collecting the noise data; analyzing the noise data; comparing the collected noise data with the noise standards; building a sound barrier at the noise position and eliminating the noise; evaluating the noise analysis effect based on the sound barrier.

[0006] Based on the special production conditions, location and layout of the enterprise, the above-disclosed existing technologies cannot achieve the first "zero distance" standard between the residential area and the factory boundary in China; nor can they achieve noise analysis standards in a large area (factory area of ​​1.2 million square meters) and complex industrial conditions. In view of the fact that there are no mature cases to learn from in China, it is an important issue to take this opportunity to explore innovative technical means and ultimately achieve comprehensive emission standards. Summary of the invention

[0007] The purpose of the present invention is to provide an industrial site noise analysis method and system, which adopts different control schemes according to the layout of the production site and the distribution of the main noise-generating equipment, and uses a combination of integrated closure, soundproof walls, soundproof barriers and other control measures to control the noise in different areas, so as to effectively ensure that the noise at the factory boundary and the noise in the residential area meet the emission standards. To achieve the above purpose, the present invention provides the following technical solutions:

[0008] The present invention provides an industrial site noise analysis method, the method comprising the following steps:

[0009] Compare the noise surveyed at the production site with the noise spectrum range, predict the noise level, and identify the main noise sources;

[0010] According to the actual situation of the production site and the sensitive points of the surrounding environment, noise reduction tests are carried out on the single equipment of the main noise source, and the test data are statistically analyzed;

[0011] Based on the above test data, a plan for controlling the main noise sources in different regions is generated.

[0012] Furthermore, one or more of SoundPLAN, Cadna, ALIMDEP, NoiseMap or MIZER21 software is used to predict the noise level.

[0013] Furthermore, the noise level was predicted using SoundPLAN software.

[0014] Furthermore, the noise spectrum range is based on the ISO 1996 standard document.

[0015] Furthermore, the content of the noise reduction test includes: conducting a single noise reduction test on the single device that contributes the most to noise, the test content is to install a sound insulation cover outside the single device, simulate the sound insulation and noise reduction effect of the single device that is the main noise source, and count the test data.

[0016] Furthermore, the test data includes noise values ​​before and after the sound insulation enclosure is installed.

[0017] Further, before installing the sound insulation cover: the noise value inside the empty sound insulation cover, the noise value outside the empty sound insulation cover, and the noise value outside the single device with the largest noise contribution;

[0018] After installing the sound insulation cover: the noise value outside the single device with the largest noise contribution.

[0019] Further, based on the above test data, a scheme for analyzing the main noise sources by region is proposed, including:

[0020] According to the production process, divide the production area and screen out the main noise sources in each area;

[0021] Fully enclose and treat the main noise sources in each area. For the auxiliary areas that cannot be fully enclosed and the areas with one-way noise impact on the residential area, take comprehensive measures such as sound insulation barriers, single device enclosures, and sound insulation walls for treatment.

[0022] The present invention also provides an industrial site noise analysis system, which includes:

[0023] A determination module for comparing the noise and noise spectrum range investigated at the production site, predicting the noise level, and determining the main noise sources;

[0024] A statistics module for conducting noise reduction tests on the single devices of the main noise sources according to the actual situation at the production site and the surrounding environmental sensitive points, and statistically analyzing the test data;

[0025] A generation module for generating a scheme for treating the main noise sources by region based on the above test data.

[0026] Further, the generation module includes:

[0027] A screening unit for dividing the production area according to the production process and screening out the main noise sources in each area;

[0028] A treatment unit for fully enclosing and treating the main noise sources in each area. For the auxiliary areas that cannot be fully enclosed and the areas with one-way noise impact on the residential area, take comprehensive measures such as sound insulation barriers, single device enclosures, and sound insulation walls for treatment.

[0029] The technical effects and advantages of the present invention:

[0030] First, the research results of the present invention solve the technical problem of simultaneously meeting the discharge standards of factory boundary noise and residential area noise under specific conditions of a large range, complex industrial conditions, and "zero distance" and "long distance" from residential areas, especially for enterprises where the entire factory area cannot be integrally enclosed due to the construction of the factory in mountainous areas. This technology can be applied to large comprehensive beneficiation enterprises with similar terrain conditions in the Panxi region, reducing the probability of ineffective treatment and greatly improving the treatment effect.

[0031] Second, the present invention has achieved the first "zero distance" compliance between the residential area and the factory boundary in China; it has achieved noise treatment compliance under large-scale (factory area of 1.2 million square meters) and complex industrial conditions; in the case of wide, scattered, and multiple audio frequencies of noise sources in the factory area, irregular factory distribution, non-unified sound sources, step-by-step treatment, and the influence of sound source superposition, full compliance has been achieved; according to the geographical location relationship between the factory area and the residential area, the time and space impacts of noise sources are analyzed, and multi-directional treatment measures are studied to achieve full compliance.

[0032] Other features and advantages of the present invention will be described in the following specification, and some of them will become obvious from the specification or be understood by implementing the present invention. The objectives and other advantages of the present invention can be achieved and obtained through the structures pointed out in the specification and the drawings. Brief Description of the Drawings

[0033] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the following drawings are some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0034] Figure 1 It is a flowchart of an industrial site noise analysis method of the present invention;

[0035] Figures 2a - 2d It is a noise spectrum diagram of different main equipment in the embodiments of the present invention;

[0036] Figure 3 It is a schematic diagram of the noise impact generated by different main equipment in the embodiments of the present invention;

[0037] Figures 4a - 4b It is a schematic diagram of the single equipment noise reduction test in the embodiments of the present invention;

[0038] Figure 5 It is a schematic diagram of the geographical location relationship between a certain beneficiation plant enterprise and its surrounding environment in the embodiments of the present invention;

[0039] Figures 6a - 6d It is a simulation diagram of the effect of the treatment measures used in the embodiments of the present invention;

[0040] Figure 7 Schematic diagram for treating a single sound insulation barrier according to an embodiment of the present invention;

[0041] Figure 8 Schematic diagram of the scope of the treatment area according to an embodiment of the present invention;

[0042] Figures 9a - 9b Schematic diagram of the treatment facilities in the crushing area according to an embodiment of the present invention;

[0043] Figures 10a - 10b Schematic diagram of the treatment facilities in areas such as screening and belt gallery according to an embodiment of the present invention;

[0044] Figures 11a - 11b Schematic diagram of the treatment measures in the ball milling area according to an embodiment of the present invention;

[0045] Figure 12 Schematic diagram of an industrial site noise analysis system according to an embodiment of the present invention. Detailed implementation manners

[0046] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0047] The flowcharts shown in the accompanying drawings are only illustrative and do not necessarily include all the steps. For example, some steps can be decomposed, while some steps can be combined or partially combined. Therefore, the actual execution order may change according to the actual situation.

[0048] The terms "first", "second", etc. in the specification, claims and the above accompanying drawings of the present application are used to distinguish similar objects and do not necessarily need to describe a specific order or sequence. It should be understood that such used data can be interchanged under appropriate circumstances so that the embodiments of the present application described here can be implemented in an order other than those illustrated or described here.

[0049] In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusion. For example, a process, method, system, product or device including a series of steps or sub-modules does not necessarily have to be limited to those steps or sub-modules clearly listed, but may include other steps or sub-modules not clearly listed or inherent to these processes, methods, products or devices.

[0050] To solve the deficiencies of the prior art, the present invention discloses an industrial site noise analysis method,Figure 1 A flowchart of a method for analyzing industrial site noise according to the present invention is as follows Figure 1 As shown, the method includes the following steps:

[0051] Step S1: Compare the noise and noise spectrum range investigated at the production site, predict the noise level, and determine the main noise sources;

[0052] In step S1 of the present invention, one or more of the software such as SoundPLAN, Cadna, ALIMDEP, NoiseMap or MIZER21 is used to predict the noise level, preferably SoundPLAN software.

[0053] The noise spectrum range is based on the ISO 1996 standard document.

[0054] Step S2: According to the actual situation of the production site and the surrounding environmental sensitive points, conduct noise reduction tests on the individual equipment of the main noise sources, and statistically analyze the test data;

[0055] In step S2 of the present invention, the main contents of the noise reduction test include: conducting individual noise reduction tests on the individual equipment with the largest noise contribution. The test content is to install a sound insulation cover outside the individual equipment to simulate the sound insulation and noise reduction effect of the individual equipment of the main noise source, and statistically analyze the noise value data before and after the installation of the sound insulation cover.

[0056] The test data includes the noise values before and after the installation of the sound insulation cover, specifically including:

[0057] Before the installation of the sound insulation cover: the noise value inside the empty sound insulation cover, the noise value outside the empty sound insulation cover, and the noise value outside the individual equipment with the largest noise contribution;

[0058] After the installation of the sound insulation cover: the noise value outside the individual equipment with the largest noise contribution.

[0059] Step S3: Based on the above test data, generate a plan for sub-region treatment of the main noise sources, including:

[0060] Divide the production area according to the production process, and screen out the main noise sources in each area;

[0061] Fully enclose the main noise sources in each area. For the auxiliary areas that cannot be fully enclosed and the areas with one-way noise impact on the residential areas, take comprehensive measures such as sound insulation barriers, individual equipment enclosures, and sound insulation walls for treatment.

[0062] Example:

[0063] The ore dressing plant in this example was built in 1966 and was officially put into production in 1970. The main plant area covers an area of 350,000 m 2The process adopts a three-stage and one-closed-circuit crushing, two-stage grinding, and three-stage magnetic separation process. The grinding and separation are divided into 16 production series, with an annual processing capacity of about more than 13 million tons, and the designed annual output of iron concentrate is 5 million tons.

[0064] According to the technological sequence, the main equipment in the concentrator includes primary crushers (2 sets), intermediate crushers (6 sets), fine crushers (10 sets), screening machines (10 sets), dry separators (12 sets), ball mills (32 sets), and magnetic separators (48 sets).

[0065] According to the actual situation on site, all workshops are open workshops, and there are no effective sound source isolation measures between production areas and between equipment. As a result, equipment with different sound frequencies affect each other, and it is impossible to achieve the purpose of meeting the discharge standards through a single treatment method.

[0066] Due to following the principle of "production first, living second" during the construction period, the production plant area was built first, and then the living area was built around the production plant area. As a result, there is no obvious boundary between the plant area and the living area, and there is a phenomenon of "zero-distance" contact. Moreover, since Panzhihua belongs to a mountainous terrain, both the concentrator plant area and the residential area are higher in the north and lower in the south. The elevation of some living areas is higher than that of the noise-producing production areas, and the plant area noise can spread to the living area without obstruction, having a great impact on the living area. As residents' requirements for the quality of life are getting higher and higher, they are also increasingly dissatisfied with the impact of the concentrator noise. As a result, before comprehensive treatment, there are more and more complaints about the plant area noise. According to incomplete statistics, since 2010, the number of complaint cases regarding noise has increased year by year, and the task of achieving comprehensive treatment and meeting the standards is extremely urgent.

[0067] Based on this, the embodiment of the present invention provides an industrial site noise analysis method, which specifically includes the following steps:

[0068] Step S1: According to the concentrator address, compare the noise and noise frequency spectrum range (based on the ISO 1996 standard document) investigated at the production site, and use Sound PLAN software to predict the noise level, and determine that the main noise sources at the production site are: crushers, screening machines, dry separators, ball mills, magnetic separators and their supporting motors, belt corridors and other areas. Figures 2a - 2d It is the noise frequency spectrum diagram of different main equipment in the embodiment of the present invention; among them, Figure 2a is the noise frequency spectrum diagram of equipment reducers and motor equipment, Figure 2b is the noise frequency spectrum diagram of ball mill equipment, Figure 2c is the noise frequency spectrum diagram of ore crushing equipment, Figure 2d is the noise frequency spectrum diagram of ore screening equipment, Figure 3 is the schematic diagram of the noise impact generated by different main equipment in the embodiment of the present invention.

[0069] Step S2: Combine Figures 2a - 2d andFigure 3 , according to the actual situation of the production site and the surrounding environmental sensitive points, noise reduction tests are carried out on the individual equipment of the main noise sources. The main content of the noise reduction test is to wrap the cylinder of the ball mill with an additional cover to simulate the noise reduction effect of the individual sound insulation of the main noise sources. The statistical test data results are shown in Table 1. Figures 4a - 4b This is a schematic diagram of the noise reduction test of the individual equipment in the embodiment of the present invention, where Figure 4a is a schematic diagram of the wall thickness of the sound insulation cover, Figure 4b is a cross-sectional view of the sound insulation cover, as Figures 4a - 4b , after the individual equipment undergoes the noise reduction experiment, the noise reduction effect fails to meet the expectations.

[0070] Table 1 Noise values before and after the installation of the sound insulation cover

[0071]

[0072] Step S3. Based on the above test data, propose a plan for analyzing the main noise sources in different regions: First

[0073] Figure 5 This is a schematic diagram of the geographical location relationship between a certain ore dressing plant enterprise and the surrounding environment in the embodiment of the present invention. Combining Figures 2a - 2d , Figure 3 , and Figures 4a - 4b , fully investigate the spectrum, layout, influence relationship, geographical location relationship and mutual influence of the noise-generating equipment, and propose various preliminary analysis ideas. Figures 6a - 6d This is a simulation diagram of the effect of the analysis measures used in the embodiment of the present invention, where Figure 6a , 6b are software modeling. 6c is the distribution map of the noise value before treatment, and 6d is the distribution map of the noise value after treatment. As shown in the figure, the treatment plan is finally determined.

[0074] Plan 1: Build multiple sound insulation walls and sound insulation screens:

[0075] According to the above analysis, whether it is a sound insulation barrier or a sound insulation wall, due to the elevation difference between the factory area and the residential area (the affected residential area is higher than the factory area), based on the principle analysis of the sound insulation barrier and the wall, whether the sound wave is absorbed or not, the sound source will penetrate or bypass the obstacle and continue to spread, resulting in the instability of the treatment effect. Moreover, although the belt transfer station does not belong to the main noise-generating equipment, during the operation process, because it is the tallest building in the factory area, the sound spreads to the residential area without any obstacle during the propagation process, affecting the residents. Figure 7 This is a schematic diagram of the treatment of a single sound insulation barrier in the embodiment of the present invention; from Figure 7It can be seen that to ensure the treatment effect, the sound insulation barrier needs to be higher than the elevation of the residential area, that is, the height should be at least more than 30 meters to ensure the sound insulation effect. However, according to the on-site terrain analysis, some sound barriers need to be built along the slope. If a wall is built, the requirements for the slope and foundation are too high, which will not only lead to additional investment, but also may not be implemented due to technical problems during construction; if a barrier is built, due to its light weight, the wind load requirements are too high. Both cannot be implemented because the safety of the building itself cannot be guaranteed.

[0076] Solution 2: Comprehensive enclosure of the factory area:

[0077] Figure 8 This is a schematic diagram of the governance area scope of the embodiment of the present invention. As Figure 8 shown, according to the on-site investigation, excluding other areas that do not need to be treated such as the office area and the greening area, the area that needs to be comprehensively enclosed and treated is about 300,000 square meters. Not only is the cost high, but due to the terrain problem, the plan for comprehensive enclosed treatment hardly holds.

[0078] Final solution determination: Through Figures 6a - 6d the simulation effect schematic diagram and scheme comparison, it is finally determined to adopt a combined method of enclosure, sound insulation wall, sound insulation barrier, etc. for zoned governance analysis. Figure 9 is a schematic diagram of the crushing area analysis facilities of the embodiment of the present invention, in which, Figure 9a is a schematic diagram of the fully enclosed facility on the south side of the fine crushing workshop, Figure 9b is a schematic diagram of the fully enclosed facility on the west side of the fine crushing workshop; Figure 10 is a schematic diagram of the analysis facilities in areas such as screening and belt corridor of the embodiment of the present invention, in which, Figure 10a is a longitudinal sectional view of the sound insulation cover of the speed reducer, Figure 10b is a schematic diagram of the sound insulation facility of the belt conveying transfer station; Figure 11 is a schematic diagram of the analysis measures in the ball milling area of the embodiment of the present invention, in which, Figure 11a is a schematic diagram of the layout of the sound insulation wall on the back of the grinding and separation workshop, Figure 11b is a schematic diagram of the noise reduction facility on the roof of the grinding and separation workshop. As shown in Figures 9 - 11, comprehensive treatment measures are taken, including fully enclosing the centralized workshop, segmentally enclosing the belt conveying corridors in the connecting processes, adding sound walls or sound insulation barriers in the direction of the residential area with greater impact, and sound insulation for individual equipment facilities in a small part.

[0079] Treatment effect: It can be seen from the monitoring data in Table 2 that the maximum noise reduction at the east, south, west, and north factory boundaries is 24.4 dB, and the minimum noise reduction is 7 dB from before treatment to after treatment.

[0080] Table 2 Monitoring data of noise values in each area before and after treatment

[0081]

[0082]

[0083] Based on the above method, the present invention also provides an industrial site noise analysis system, Figure 12 which is a schematic diagram of an industrial site noise analysis system of the present invention, as Figure 12 shown. The system includes:

[0084] A determination module 201, configured to compare the noise and the noise spectrum range investigated at the production site, predict the noise level, and determine the main noise sources;

[0085] A statistics module 202, configured to conduct noise reduction tests on the individual equipment of the main noise sources according to the actual situation at the production site and the surrounding environmental sensitive points, and statistically analyze the test data;

[0086] A generation module 203, configured to generate a plan for governing the main noise sources in sub-regions based on the above test data.

[0087] Further, the generation module 203 includes:

[0088] A screening unit, configured to divide the production area into a crushing area and a grinding and separation area according to the production process, and screen out the main noise-producing sources in each area;

[0089] A governance unit, configured to conduct full-enclosure governance on the main noise-producing sources in each area, and take comprehensive measures such as sound insulation barriers, individual equipment enclosures, and sound insulation walls for the auxiliary areas that cannot be fully enclosed and the areas that have a one-way noise impact on residential areas for governance.

[0090] Finally, it should be noted that the above are only the preferred embodiments of the present invention and are not used to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, for those skilled in the art, they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements on some of the technical features. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. An industrial site noise analysis method, characterized in that, The method includes the following steps: Compare the noise and noise spectrum range investigated at the production site, predict the noise level, and determine the main noise sources; According to the actual situation of the production site and the surrounding environmental sensitive points, conduct noise reduction tests on the individual equipment of the main noise sources, and statistically analyze the test data; Based on the above test data, generate a plan for sub-regionally controlling the main noise sources.

2. The industrial site noise analysis method according to claim 1, characterized in that, Use one or more of the software such as SoundPLAN, Cadna, ALIMDEP, NoiseMap, or MIZER21 to predict the noise level.

3. The industrial site noise analysis method according to claim 2, wherein, Use SoundPLAN software to predict the noise level.

4. The industrial site noise analysis method according to claim 1, characterized in that The noise spectrum range is based on the ISO 1996 standard document.

5. The industrial site noise analysis method according to claim 1, wherein The content of the noise reduction test includes: conduct individual noise reduction tests on the individual equipment with the largest noise contribution. The test content is to install a sound insulation cover outside the individual equipment to simulate the sound insulation and noise reduction effect of the individual equipment of the main noise source, and statistically analyze the test data.

6. The industrial site noise analysis method according to claim 1 or 5, characterized in that The test data includes the noise values before and after the installation of the sound insulation cover.

7. The industrial site noise analysis method according to claim 6, characterized in that Before installing the sound insulation cover: the noise value inside the empty sound insulation cover, the noise value outside the empty sound insulation cover, and the noise value outside the individual equipment with the largest noise contribution; After installing the sound insulation cover: the noise value outside the individual equipment with the largest noise contribution.

8. The industrial site noise analysis method according to claim 1, characterized in that, Based on the above test data, the proposed plan for sub-regionally analyzing the main noise sources includes: According to the production process, divide the production area and screen out the main noise sources in each area; Completely enclose and control the main noise sources in each area. For the auxiliary areas that cannot be completely enclosed and the areas with one-way noise impact on the residential areas, take comprehensive measures such as sound insulation barriers, individual equipment enclosures, and sound insulation walls for treatment.

9. An industrial site noise analysis system, characterized in that, The system includes: A determination module, used to compare the noise and noise spectrum range investigated at the production site, predict the noise level, and determine the main noise sources; A statistics module, used to conduct noise reduction tests on the individual equipment of the main noise sources according to the actual situation of the production site and the surrounding environmental sensitive points, and statistically analyze the test data; A generation module, used to generate a plan for sub-regionally controlling the main noise sources based on the above test data.

10. The industrial site noise analysis system according to claim 9, wherein, The generation module includes: A screening unit, used to divide the production area according to the production process and screen out the main noise sources in each area; A treatment unit, used to completely enclose and control the main noise sources in each area. For the auxiliary areas that cannot be completely enclosed and the areas with one-way noise impact on the residential areas, take comprehensive measures such as sound insulation barriers, individual equipment enclosures, and sound insulation walls for treatment.

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