Acoustic analysis system and acoustic analysis program

Abstract

To provide an acoustic analysis technology for various types of buildings.SOLUTION: An acoustic analysis system 100 comprises: an analysis model generation processing unit 120 for generating an analysis model that defines a plurality of room spaces in a building using a BIM model representing structure and specifications of a building to be analyzed as three-dimensional data; an acoustic analysis processing unit 140 for extracting, from the analysis model, parameters present on a propagation path along which sound propagates from a sound source room to a sound receiving room, among the defined plurality of room spaces and calculating a sound pressure level of the sound receiving room with the sound source room as a sound source; and an output processing unit 114 for outputting the calculation result.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to an acoustic analysis system and an acoustic analysis program that analyze noise levels and the like inside a building using, for example, a BIM model. [Background technology]

[0002] Noise levels inside a building are an important factor in determining its livability, and for this reason, it is necessary to analyze noise levels inside the building from the pre-construction stage and implement noise control measures such as reconsidering the structure as necessary. For example, with regard to predicting indoor noise, there is a known prior art housing design system that detects on a floor plan the influence of not only parting walls within the house but also structures on the sound propagation path (rooms, hallways, stairwells, etc.) assumed by the designer, and calculates the noise level through openings such as doorways based on the area of ​​the openings and the distance to the target, etc. (See, for example, Patent Document 1). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2017-40128 Summary of the Invention [Problem to be solved by the invention]

[0004] Although prior art systems are capable of predicting noise levels in residential buildings with standard structures to a certain extent, they are not widely applicable to buildings with a wide variety of structures. In recent years, the structures of buildings (e.g., hotels, apartment complexes, hospitals, factories, studios, etc.) that are the targets of noise level analysis have become more diverse depending on their purpose and type, and the wavelength ranges and magnitudes of noise generated in target rooms within buildings (e.g., auditoriums, conference rooms, dining halls, banquet halls, machine rooms, etc.) vary widely, so there are limitations to systems that are only capable of predicting residential noise levels within residential buildings.

[0005] Therefore, the present invention provides an acoustic analysis technique that is compatible with various types of buildings. [Means for solving the problem]

[0006] The present invention provides an acoustic analysis system and an acoustic analysis program. The acoustic analysis system of the present invention uses a BIM model of a building to be analyzed and generates an analytical model (generation means). The analytical model is a three-dimensional structural model that defines multiple room spaces, including living rooms and non-living rooms, within the building. The acoustic analysis system also extracts from the analytical model various parameters that exist on the propagation path along which sound propagates from a specified source room to a receiving room among the multiple room spaces defined in the analytical model, and uses these parameters to calculate the sound pressure level in the receiving room with the source room as the sound source (calculation means). The acoustic analysis system then outputs the calculation results (output means). The acoustic analysis program causes a computer to execute the steps for executing each of the above functions.

[0007] A BIM model is a 3D representation of a building's structure and specifications, created during the design stage. By using a BIM model, the area and volume of each room in the building, the distance between sashes, and other information can be easily used in the analytical model generated from it. In addition, by using a BIM model to generate an analytical model, the structure of the building's parting walls, floors, and ceilings can also be easily used. This makes it possible to perform acoustic analysis under conditions similar to those in which sound propagates within an actual building, increasing the reliability of the calculation results.

[0008] Furthermore, in the analytical model, calculations are performed for sound propagation through "room spaces." Therefore, the acoustic analysis system of the present invention defines "room spaces" not only for living rooms within a building, but also for spaces other than living rooms, such as ceilings and empty spaces. Then, by arbitrarily setting "room spaces" that correspond to "sound source rooms" and "sound receiving rooms" from among the multiple defined "room spaces," various parameters (e.g., sound transmission loss and sound absorption coefficient of each material, such as finishing materials, sashes, floors, and ceilings) present on the propagation path of sound from the "sound source room" to the "sound receiving room" are extracted from the analytical model. This enables acoustic analysis of sound generated in a "sound source room" within the analytical model propagating to a "sound receiving room" using various parameters, and the sound pressure level in the "sound receiving room" with the "sound source room" as the sound source is calculated. Additionally, the sound pressure level for each "room space" present on the propagation path is calculated, making it possible to analyze how sound propagates from the sound source room within a building to surrounding room spaces.

[0009] The calculation results can be output in the form of a report summarizing the analysis values ​​or in the form of a chart plotting the analysis values. Referencing such calculation results can be useful for noise control measures within the building being analyzed (e.g., examining whether the sound insulation design is sufficient or excessive, and whether the required performance is achieved).

[0010] In particular, when a building has large indoor spaces, noise leaking from the "sound source room" (for example, an auditorium, conference room, dining hall, banquet hall, machine room, etc.) to other rooms via the partition walls, partition floors, and ceilings is an issue that requires noise control measures, and therefore the acoustic analysis according to the present invention is extremely useful for noise control measures.

[0011] Preferably, when generating an analytical model, a check is made to see whether or not the rooms in the building are targets for which sound pressure levels can be calculated. There are certain conditions that must be met for acoustic analysis to be possible for a room that is a target of a "sound receiving room." If it is confirmed that the target room satisfies the certain conditions, room spaces are defined for all spaces other than the room, and an analytical model is generated.

[0012] In actual buildings, some rooms may not be suitable for acoustic (sound insulation) analysis due to their design. In such cases, a preliminary check is performed, and an analytical model is generated only if the room in question is suitable for analysis. This preliminary check is easily achieved because the present invention uses a BIM model of the actual building to generate the analytical model.

[0013] In the present invention, the number of passing elements through which sound passes from the sound source room to the sound receiving room can be set as a calculation condition for sound pressure level. This is possible by defining multiple room spaces in the analysis model. That is, in the analysis model, there are passing elements (passing members) through which sound passes, such as partition walls, floors, and ceilings, between room spaces, and the propagation path in acoustic analysis will differ depending on the number of passing elements through which the sound passes along the way. For this reason, in the present invention, the number of passing elements (1 to n) can be set arbitrarily to search for sound propagation paths in the analysis model and calculate sound pressure levels.

[0014] This makes it possible for even those who are not particularly skilled in acoustic analysis of sound insulation, etc., to calculate sound pressure levels that take into account the sound propagation path from the sound source room to the sound receiving room simply by setting the number of passing elements as desired.

[0015] Furthermore, depending on the number of passing elements set, the calculation conditions can be set to include at least one of the following: internal noise that propagates inside the building from the sound source room to the sound receiving room; reflective noise that propagates from the sound source room to the sound receiving room through passing elements arranged along the exterior wall surface; and external background noise that enters the sound receiving room from outside the building.

[0016] That is, in terms of noise countermeasures, there is an increasing need to take measures not only against railway and road traffic noise and internal noise from outdoor equipment, but also against noise that leaks into a room through passing elements arranged along the exterior wall, such as sashes and openings (louvers and ventilation openings), and noise that enters from outside. For this reason, in this invention, if the number of passing elements is set to a certain number or more (for example, 4 to 5 or more), the sound pressure level in the sound receiving room is calculated by setting the leaking sound and external background noise as calculation conditions. This allows for thorough implementation of various noise countermeasures.

[0017] In the present invention, the positions of the room spaces that will become the "sound source room" and the "sound receiving room" can be set on a two-dimensional model (floor plan, cross section, etc.) generated from the analysis model. This allows the calculation conditions to be set more intuitively, improving the convenience of acoustic analysis.

[0018] The acoustic analysis system of the present invention can be equipped with a database in which parameters such as sound transmission loss and sound absorption coefficient for each of the various passage elements (finishing materials, sashes, floors, ceilings, etc.) mentioned above are registered in advance. This allows parameters present on the sound propagation path to be referenced and easily extracted in the database during noise analysis, thereby enabling accurate calculation of sound pressure levels.

[0019] Any one of the multiple types of materials registered in the database can be selected, and when the selection of a material that previously used parameters is changed, the sound pressure level can be recalculated using the parameters of the changed material and output as the changed calculation result. This makes it possible to easily select a material that satisfies the required sound pressure level in a sound receiving room by appropriately changing the material to be selected while referring to the calculation result, for example.

[0020] The database also contains information on various noise sources. This information includes not only noise that may be generated in the source room, but also external noise (railway and road traffic noise, etc.) that may be generated outside the building. This makes it possible to perform acoustic analysis (noise propagation analysis within the analytical model) when noise is generated in a variety of arbitrary locations inside and outside the building.

[0021] The results of the acoustic analysis calculations are displayed in a format that displays the changes in sound pressure levels along multiple propagation paths from the sound source room to the sound receiving room in multiple transition graphs for each propagation path.This makes it possible to display and output a list of parameters that exist along the propagation path corresponding to any transition graph selected from the multiple displayed transition graphs.

[0022] This makes it possible, for example, to display a graph of changes in sound pressure level on the device screen, and by clicking on the target graph in the GUI, parameters of structures (passing elements) on the propagation path from the sound source room to the sound receiving room (observation point) will be displayed in a pop-up.

[0023] In addition to the graph display format described above, the calculation results can also be output as a contour diagram. In this case, the distribution of sound pressure levels in other room spaces with the source room as the sound source can be visualized as a contour diagram for at least one of the plan, cross-section, or three-dimensional diagram of the building obtained from the analytical model. Since contour display is possible not only in two dimensions but also in three-dimensional diagrams (BIM models), it is possible to visually recognize how noise spreads spatially within a building. This clarifies the sound insulation effect within a building and greatly contributes to the consideration of noise control measures.

[0024] In this way, by using a BIM model of a building for acoustic analysis, this invention makes it possible to use an actual structural model and perform acoustic analysis that takes into account not only the parting walls within the building, but also the structure of the parting floors, ceilings, etc. Furthermore, the results of the acoustic analysis calculations make it easier to distinguish between cases where measures can be taken by changing the materials of the passing elements and cases where structural measures are necessary, thereby reducing the amount of work required for noise control. [Effects of the Invention]

[0025] As described above, according to the present invention, it is possible to provide an acoustic analysis technique that is compatible with various types of buildings. [Brief explanation of the drawings]

[0026] [Figure 1] FIG. 1 is a block diagram showing an example of the configuration of an acoustic analysis system 100. [Figure 2] 1 is a flowchart showing an example of the procedure of acoustic analysis processing executed by the acoustic analysis system 100. [Figure 3] FIG. 10 is a diagram illustrating an example of generation of an analytical model. [Figure 4] FIG. 10 is a diagram showing an example of execution of a model check when generating an analysis model. [Figure 5] FIG. 10 is a diagram showing an example of defining a plurality of room spaces in an analytical model. [Figure 6] FIG. 10 is a diagram illustrating an example of setting the number of elements through which sound passes from a sound source room to a sound receiving room. [Figure 7] FIG. 10 is a contour diagram showing an example of the output result of acoustic analysis processing. [Figure 8] 10A and 10B are contour diagrams showing other example results output for two-dimensional plan views and cross-sectional views. [Figure 9] This is a contour diagram showing an example of the output result of acoustic analysis processing expressed in a three-dimensional perspective view. [Figure 10] FIG. 10 is a diagram showing an example of an output in which the results of the acoustic analysis process are displayed in a sound pressure level calculation report. [Figure 11] FIG. 10 is a diagram showing an example of an output in which the results of acoustic analysis processing are displayed in a reverberation time calculation report. [Figure 12] FIG. 10 is a diagram showing an example of a case study using the calculation results. DETAILED DESCRIPTION OF THE INVENTION

[0027] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0023] The following describes preferred embodiments of the present invention with reference to the accompanying drawings. In the following embodiments, preferred examples of an acoustic analysis system and an acoustic analysis program are given, but the present invention is not limited to the illustrated embodiments.

[0028] [System configuration example] 1 is a block diagram showing an example configuration of an acoustic analysis system 100. The acoustic analysis system 100 is configured, for example, with a computer device 102 as hardware, and functions when the computer device 102 executes an acoustic analysis program of an embodiment. In addition to a main body 102a, the computer device 102 has a display 102b such as a liquid crystal display device, and input devices such as a keyboard 102c and a mouse 102d. Note that the computer device 102 is not limited to a so-called desktop type, and may be a notebook type (laptop type), a tablet type, or the like.

[0029] The acoustic analysis system 100 includes several functional elements that are realized using the hardware resources of the computer device 102. The functional elements include, for example, basic elements such as a control unit 110, an input processing unit 112, an output processing unit 114, and an image processing unit 116, as well as core elements such as an analysis model generation processing unit 120 that is specialized for processing by the acoustic analysis system 100, an analysis condition setting processing unit 130, and an acoustic analysis processing unit 140. Furthermore, a database 160 is constructed in a storage medium 150, which is a hardware resource, and this database 160 also constitutes the acoustic analysis system 100. The storage medium 150 is configured as a built-in device of the computer device 102 or a peripheral device.

[0030] [Basic elements] The control unit 110 controls the overall processing within the acoustic analysis system 100. The input processing unit 112 and output processing unit 114 perform processing for inputting and outputting signals to and from devices such as the keyboard 102c and mouse 102d, and inputting and outputting data signals to and from external connection destinations using various communication protocols. The output processing unit 114 performs processing for outputting the analysis results of the acoustic analysis system 100, and the image processing unit 116 performs image processing for displaying the output results of the output processing unit 114 as an image on the display 102b.

[0031] [Core Elements] The analytical model generation processing unit 120 executes processing to generate an analytical model using a BIM model of the building. The BIM model used is a three-dimensional structural model of the building to be analyzed in the acoustic analysis system 100. The BIM model is created using a BIM tool (for example, REVIT: a registered trademark) separate from the acoustic analysis system 100. The analytical condition setting processing unit 130 executes processing to set various analytical conditions to be applied when performing acoustic analysis (sound insulation calculation). The acoustic analysis processing unit 140 executes acoustic analysis processing using the analytical model under the set analytical conditions. Details of the generation of the analytical model, the setting of analytical conditions, and the acoustic analysis processing will be described further below with reference to other drawings.

[0032] The database 160 also contains a "physical property database" and a "sound source database." The "physical property database" stores pre-registered physical property data such as sound transmission loss and sound absorption coefficient for each structural member (e.g., wall, floor, ceiling, roof, door, window, curtain wall, etc.) located on the sound propagation path as parameters used in acoustic analysis (sound insulation calculation). The "sound source database" stores noise source information (e.g., machine operation noise, talking voice, AV equipment noise, musical instrument playing noise, traffic noise, etc.) as sound source data required for acoustic analysis. The acoustic analysis processing unit 140 refers to the database 160 when performing analysis processing, and can extract noise source information and corresponding parameters as appropriate for use in calculations. Note that the data structure registered in the database 160 is not limited to the above.

[0033] [Add-in format] In this embodiment, a BIM tool execution processor 170 can be implemented in the computer device 102 as a separate component from the acoustic analysis system 100. The BIM tool execution processor 170 is an element that executes the above-mentioned BIM tool in the computer device 102, and is used by a user such as a building designer, for example. When the acoustic analysis system 100 and the BIM tool execution processor 170 coexist in the same computer device 102 in terms of hardware configuration, the acoustic analysis system 100 of this embodiment can be used as an add-in to the BIM tool. Note that the acoustic analysis system 100 does not always need to be used in add-in format, and may be configured as a tool specialized for acoustic analysis (sound insulation calculation). In this case, the configuration of the BIM tool execution processor 170 does not need to be implemented in the computer device 102.

[0034] [Acoustic analysis processing] Fig. 2 is a flowchart showing an example of the procedure of acoustic analysis processing executed by the acoustic analysis system 100. The acoustic analysis program of this embodiment causes the computer device 102 to execute the procedure of Fig. 2. The example procedure will be described below.

[0035] Step S100: The analysis model generation processing unit 120 acquires a BIM model of the structure to be analyzed this time. The BIM model can be one generated by the BIM tool execution processing unit 170 as described above. If the BIM tool execution processing unit 170 is not installed in the same hardware environment, the BIM model can be acquired from an external device or the like via the input processing unit 112.

[0036] Step S102: The analytical model generation processing unit 120 executes the analytical model generation process. This process further includes the following detailed steps. (1) The acquired BIM model is replicated and used as the basis for the analysis model. (2) Run a model check to confirm whether acoustic analysis (sound insulation calculation) is possible for the target room. For example, if the interior of the building is configured with curves or there are no floor instances, acoustic analysis will not be possible. In all other cases, acoustic analysis is possible and the model check is complete. (3) Define multiple room spaces within the analysis model (dedicated to sound insulation calculations). Room spaces are defined as living rooms within the structure, as well as any other spaces (e.g., attic, underfloor, corridors, aisles, etc.). If an error occurs in the model check, the acoustic analysis system 100 temporarily exits the process and executes processing to output an error message to the display 102b. On the other hand, if no error occurs, processing to output a message indicating completion of the model check is executed, and the process proceeds to the next step S104.

[0037] Step S104: The analysis condition setting processing unit 130 executes an analysis condition setting process. In this process, calculation conditions necessary for acoustic analysis are set. For example, the following conditions can be set: (1) Setting the calculation target: Set the conditions as internal noise (walls, floors, doors, ceilings, etc.), sash noise, and external background noise. (2) Setting the number of passing elements (passing members): The number of passing elements of sound present on the sound propagation path from one sound source room to another (for example, 1 to 5) is set as a condition. (3) Source room and receiving room settings: Specified from the floor plan (multiple selections allowed). (4) Noise source setting: Set the noise source as a condition by directly inputting it or specifying it from a sample list (speech, music performance, traffic noise).

[0038] Step S106: The acoustic analysis processing unit 140 executes an acoustic (sound insulation) analysis process. In this process, an acoustic analysis (sound insulation calculation) is performed using an analytical model under set analysis conditions. The acoustic analysis is based on the calculation of the sound pressure level (dBA) in the sound receiving room with the sound source room as the sound source, but other factors such as the indoor noise level (NC value, N value), the sound pressure level difference between rooms (D value), etc. are also calculated. The acoustic analysis process will be described in more detail later.

[0039] Step S108: The output processing unit 114 and the image processing unit 116 execute a result output process. In this process, the result of the acoustic analysis (for example, the calculation result of the sound pressure level in the sound receiving room) is displayed on the display 102b. An example of the output of the calculation result will be further described using another drawing.

[0040] Step S110: The acoustic analysis system 100 determines whether or not to execute a case study. The user can determine whether or not to execute a case study based on, for example, whether the sound pressure level in the sound receiving room is within the target sound insulation performance range. In this process, the acoustic analysis system 100 prompts the user for input by displaying, for example, a dialog message on the display 102b asking, "Do you want to execute a case study?" along with buttons offering options such as "Yes" and "No." If the user responds with "Yes," the system determines that a case study is executed (Yes) and executes steps S104 and subsequent steps again. If the user responds with "No," the system determines that a case study is not executed (No), and terminates this process. Note that after determining that a case study is not executed (No), the system may re-execute the final result output process. Furthermore, the acoustic analysis system 100 can automatically reflect the results of the case study in the original BIM model.

[0041] [Example of generating an analysis model] Figure 3 is a diagram showing an example of the generation of an analytical model. In the analytical model generation process (step S102 in Figure 2), the analytical model AMD is generated by duplicating the BIM model BMD designed on the BIM tool side (Figure 3(A) → Figure 3(B)). Therefore, the analytical model AMD reflects in detail the entire three-dimensional structure of the building (e.g., hotel, residence, hospital, factory, studio, etc.) that is actually planned to be constructed. In addition, the specifications of the various components used in the structure are also reflected in detail in the analytical model AMD.

[0042] [Model check execution example] Figure 4 shows an example of model checking when generating an analytical model AMD. As mentioned above, when generating an analytical model AMD, a model check is performed on the copy made from the BIM model BMD to check whether acoustic analysis (sound insulation calculation) is possible. The example in Figure 4 uses a floor plan of a representative floor of the target building. This type of model checking method is suitable for use when the layout of the building is the same for all floors.

[0043] [Specifying the scope of the target] Furthermore, the range of rooms to be targeted for model checking can be specified by specifying all rooms (All Rooms), by specifying any room (Room Specification), or by specifying a floor and an area enclosed by a rectangular frame (Level / Rectangular Area Specification), and among these, the most efficient method is to specify the target rooms using "Room Specification." The example in Figure 4 uses the "Room Specification" method, where the colored area in the floor plan is specified as the target range.

[0044] In this building, there are multiple rooms R1 to R13 on one typical floor, as well as corridors CD leading to each room, a linen room RN and other room spaces (no symbol), elevator hall EH, and elevator shaft (no symbol). In this example, the target range is the four rooms R1 to R4 facing the front of the building, and the corridors CD and elevator hall EH leading to them. This is because, even if all rooms R1 to R13 are not targeted, the sound insulation performance of the entire building can be adequately evaluated by performing acoustic analysis on structurally representative rooms R1 to R4.

[0045] Then, it is checked whether the target range satisfies the calculation conditions described in the analysis model generation process (step S102 in FIG. 2), and if it is confirmed that the calculation conditions are satisfied, the model check is completed.

[0046] [Example of room space definition] FIG. 5 is a diagram showing an example of defining multiple room spaces in the analytical model AMD. The room spaces are defined in the analytical model generation process (step S102 in FIG. 2) described above. When the model check is complete, room spaces are defined for the target rooms R1 to R4, as well as for all spaces other than the rooms R1 to R4, such as the attic spaces AT1 to AT4 and the underfloor spaces UF1 to UF4. Note that the attic spaces AT1 to AT4 and the underfloor spaces UF1 to UF4 appear as underfloor spaces or attic spaces when viewed from the perspective of rooms on upper or lower floors. While this example shows the definition of room spaces only for some rooms R1 to R4 on a representative floor, the definition of room spaces is performed for the entire analytical model AMD (all floors and all rooms).

[0047] [Setting the number of passing elements] FIG. 6 is a diagram showing an example of setting the number of sound passage elements from a sound source room to a sound receiving room. For example, consider a case where a certain room R1 is set as the sound source room NS and an adjacent room R2 is set as the sound receiving room NR. In this case, the number of elements (components) through which sound passes from the sound source room NS to the sound receiving room NR can be set arbitrarily, for example, from a minimum of "1" to "5." The number of passage elements is determined in the above-mentioned analysis condition setting process (step S104 in FIG. 2). For example, when the number of passage elements (e.g., 1 to 5) is set by a user operation, the analysis condition setting processing unit 130 automatically searches for sound propagation paths according to that number and incorporates them into the calculation conditions. Furthermore, propagation paths are searched for planar paths ((A) in FIG. 6) and cross-sectional paths ((B) in FIG. 6).

[0048] [Example of planar route search] In Figure 6 (A): For example, if the number of passing elements in a planar path is "1", propagation path TR1 is automatically searched. Propagation path TR1 has a boundary wall WL as one passing element between the sound source room NS and the sound receiving room NR.

[0049] Furthermore, when the number of passing elements in the planar path is "2", propagation path TR2 is searched in addition to propagation path TR1. Propagation path TR2 is a path from the sound source room NS to the sound receiving room NR via the corridor CD. This propagation path TR2 has two passing elements: the door DR of the sound source room NS and the door DR of the sound receiving room NR.

[0050] Next, if the number of passing elements in the planar path is "3," an additional propagation path TR3 is searched for. Propagation path TR3 is a path that runs from the sound source room NS via the hallway CD and then to the sound receiving room NR via another living room R3. This propagation path TR3 has three passing elements: the door DR of the sound source room NS, the door DR of living room R3, and the partition wall WL between living room R3 and the sound receiving room NR.

[0051] If the number of passing elements in the planar path is "4," an additional propagation path TR4 is searched for. Propagation path TR4 is a path that runs from the sound source room NS via the hallway CD and then via other rooms R4 and R3 to the sound receiving room NR. This propagation path TR4 has four passing elements: the door DR of the sound source room NS, the door DR of room R3, the partition wall WL between rooms R4 and R3, and the partition wall WL between room R3 and the sound receiving room NR.

[0052] [External leakage noise and external background noise] In this embodiment, external leakage noise DN and external background noise WN can also be set as calculation conditions. Of these, external leakage noise DN is sound that leaks from the sound source room NS through the sash from outside the building into the sound receiving room NR. Furthermore, external background noise WN is background noise (traffic noise, urban noise, etc.) that enters the sound receiving room NR from the surrounding environment of the building.

[0053] [Cross-section route] In Figure 6 (B): For example, if the number of passing elements in the cross-sectional path is "1", the propagation path TR1 is automatically searched. Even in the cross-sectional path, the propagation path TR1 has a boundary wall WL as one passing element between the sound source room NS and the sound receiving room NR.

[0054] Here, when the number of passing elements in the cross-sectional path is set to "2", no additional propagation paths are searched for, and only propagation path TR1 is searched for. This is because the number of passing elements in the cross-sectional path is structurally odd.

[0055] Next, if the number of passing elements in the cross-sectional path is "3", two more propagation paths, TR5 and TR7, are searched in addition to propagation path TR1. Of these, propagation path TR5 is a path from the sound source room NS to the sound receiving room NR via the attic spaces AT1 and AT2. This propagation path TR5 has three passing elements: the ceiling CL and parting wall WL of the sound source room NS, and the ceiling CL of the sound receiving room NR. Furthermore, propagation path TR7 is a path from the sound source room NS to the sound receiving room NR via the underfloor spaces UF1 and UF2. This propagation path TR7 has three passing elements: the floor FL and parting wall WL of the sound source room NS, and the floor FL of the sound receiving room NR. Note that if the number of passing elements in the cross-sectional path is "4", no additional propagation paths are searched.

[0056] If the number of passing elements in the cross-sectional path is "5," two more propagation paths, TR6 and TR8, are searched for. Of these, propagation path TR6 runs from the sound source room NS via the attic space AT1, through the upper living rooms R03 and R04, and then via the attic space AT2 to the sound receiving room NR. This propagation path TR6 has five passing elements: the ceiling CL of the sound source room NS, the upper floor floor FL, the partition wall WL between the upper living rooms R03 and R04, the upper floor floor FL, and the ceiling CL of the sound receiving room NR. Furthermore, propagation path TR8 runs from the sound source room NS via the underfloor space UF1, through the lower living rooms R01 and R02, and then via the underfloor space UF2 to the sound receiving room NR. This propagation path TR8 has five passage elements: the floor FL of the sound source room NS, the ceiling CL of the lower floor, the partition wall WL between the rooms R01 and R02 on the lower floor, the ceiling CL of the lower floor, and the floor FL of the sound receiving room NR.

[0057] [Acoustic analysis example] As described above, once various calculation conditions are set in the analytical model AMD, sound insulation calculations are performed in the acoustic analysis process (step S106 in FIG. 2). In this embodiment, for example, a calculation method using the following formula can be suitably adopted. [Definitions of various parameters, etc.]

number

number

number

number

[0058] [Parameter extraction] The various parameters used in the above calculation formulas correspond to the structural dimensions obtained from the analytical model AMD and the physical property values ​​of the materials used for the passage elements on the propagation path. As described above, the physical property values ​​of various materials are registered in advance in database 160, so that necessary parameters can be easily extracted by referring to database 160 when performing acoustic analysis calculations. If the physical property values ​​of the designed material do not exist in database 160, acoustic analysis system 100 displays a message to that effect ("Physical property acquisition error") on display 102b and presents existing templates to allow the user to select appropriate sound absorption coefficients and transmission loss.

[0059] [Example of result output] 7 is a contour diagram showing an example of the output result of acoustic analysis processing. The calculation results of acoustic analysis processing can be displayed as contours on a two-dimensional plan view (FIG. 7(A)) and a cross-sectional view (FIG. 7(B)).

[0060] In this example, the difference in sound pressure levels between rooms R1 to R4 is shown by different color gradations in both the plan view and cross section. Note that although the illustration uses gray gradations, in reality color gradations are used (the same applies hereafter). For example, if the sound pressure level of room R1, which is the sound source room NS, is expressed as the highest, the sound pressure level of room R2, which is the sound receiving room NR, is the second highest, and it can be seen that the sound pressure levels decrease the further away from the other rooms R3 and R4 they are.

[0061] [Another result output example (1)] Figure 8 is a contour diagram showing another example of the result output for a two-dimensional plan view and cross section. In the result output process described above (step S108 in Figure 2), the calculation results of the acoustic analysis can also be displayed on a plan view (left window) that reflects the entire floor, and on a cross section (right window) that reflects the entire building. This makes it possible to visualize how noise originating from a sound source room spreads within a building, which can be useful in evaluating sound insulation performance.

[0062] [Another result output example (2)] Figure 9 is a contour diagram showing an example of the results output from the acoustic analysis processing, expressed as a three-dimensional perspective view (wireframe diagram). While this example shows only one floor for ease of interpretation, the three-dimensional result output can be displayed as a contour that reflects the entire analysis model AMD. Therefore, the spread of noise from room R1, which is the source room NS, is displayed three-dimensionally in both the planar and cross-sectional directions of the building. This three-dimensional contour diagram display allows for a three-dimensional visualization of how noise originating from the source room spreads within the building, further contributing to the evaluation of sound insulation performance.

[0063] [Sound pressure level calculation report output example] Figure 10 shows an example of an output in which the results of acoustic analysis processing are displayed in a sound pressure level calculation report. The calculation results of acoustic analysis processing can be output in report format in addition to the contour diagrams (Figures 7 to 9) described above. The sound pressure level calculation report includes, for example, the following items:

[0064] As shown in the top row of Figure 10, along with a list of setting values ​​(sound source, sound absorption coefficient, transmission loss), the sound pressure level (dBA) for each room R1-R4 and corridor C-D is displayed numerically by octave band center frequency (Hz). The sound pressure level (dBA) in the sound receiving room NR is also displayed numerically by octave band center frequency (Hz) for each propagation path, along with their combined value and noise class (NC value, N value). Furthermore, the sound source room sound pressure level (dBA) and the sound receiving room sound pressure level (dBA) are displayed numerically by octave band center frequency (Hz), and the sound pressure level difference between rooms (D value) is displayed numerically as a sound insulation class.

[0065] Then, graphs of the sound pressure level (NC value), sound pressure level (N value), and sound pressure level difference (D value) are displayed in a report, as shown in the lower part of Fig. 10. The calculation report can be output in a spreadsheet file format such as CSV, or displayed on the display 102b.

[0066] [Reverberation time calculation report] FIG. 11 shows an example of an output in which the results of the acoustic analysis process are displayed in a reverberation time calculation report. The reverberation time calculation report includes, for example, the following items: Surface area (m2) of each interior finish (part) 2 ) and sound absorption coefficient are displayed numerically for each octave band center frequency (Hz), and sound absorption power (m 2 ) is displayed numerically for each octave band center frequency (Hz). In addition, the air sound absorption coefficient and sound field coefficient are displayed numerically for each octave band center frequency (Hz) as setting conditions, and the reverberation time (sec) is displayed numerically for each octave band center frequency (Hz). Although not shown, the optimum reverberation time (sec) and room volume (m 3 ) may be attached to the report.

[0067] [Case study example] Figure 12 shows an example of a case study using the calculation results. Here, a noise level transition graph (contribution graph) for each propagation path is displayed as the calculation result of the acoustic analysis, and the physical property values ​​of the passing elements on the propagation path that have a high contribution to noise propagation can be changed. This type of noise level transition graph (Figure 12(A)) can be included in, for example, the sound pressure level calculation report (Figure 10) mentioned earlier.

[0068] [Noise level transition graph (contribution graph)] In Figure 12 (A): The noise level transition graph on the left plots the transition of noise levels from the sound source room to the intermediate room and then to the sound receiving room, divided by propagation path. The plan and cross-sectional views on the right show the sound source room, intermediate room, and sound receiving room that are the subject of the calculation, as well as the sound propagation path. Each curve in the noise level transition graph shows the transition of the noise level (dBA) on the corresponding propagation path.

[0069] In the case study, for example, it can be noted that the propagation paths TR1, TR2, and TR3, which are enclosed by dashed lines in the graph, have a high degree of contribution. Such a noise level transition graph can be displayed, for example, on the screen of display 102b. When the user clicks on a curve on the graph with mouse 102d or the like, the corresponding propagation paths TR1, TR2, and TR3 are highlighted in the plan view or cross-sectional view. In addition, the cursor moves to the line of the corresponding propagation path in the report (noise level calculation sheet), not shown.

[0070] Figure 12 (B): The case study screen is displayed, and the lower section displays a list of physical properties M1 for the elements passing through the relevant propagation path (e.g., living rooms, corridors, doors, parting walls, floors, ceilings, etc.), along with a menu for changing the physical properties for each element passing through (e.g., a pull-down menu displayed by clicking). When the user changes the physical properties in the physical property list M1, the calculation results are immediately reflected in the sound pressure level list M2 for each sound receiving room in the upper section. In this way, the material of elements passing through the propagation path that contribute most to the noise level trend graph can be changed on the screen as appropriate, and the calculation results after changing the calculation conditions, such as physical properties, can be immediately confirmed. Furthermore, the physical properties of the elements passing through after the change can be automatically reflected in the BIM model as described above.

[0071] The acoustic analysis system 100 of this embodiment provides the following advantages. (1) Information necessary for sound insulation design (sound propagation path, transmission areas, interior finish, area and volume of each part, distance between sashes, etc.) can be extracted from an analysis model based on a BIM model, and the indoor noise level can be automatically calculated. (2) When used simultaneously in a hardware environment that implements BIM tools, it becomes an add-in tool (acoustic analysis program) that can automatically calculate indoor noise levels on the BIM tools. (3) Compared to the conventional method of extracting various calculation conditions from 2D drawings and creating spreadsheets, this method can significantly reduce the labor required for sound insulation design work (by more than 80%). (4) Physical properties can be automatically linked between the BIM model created in the BIM tool and the analysis model through case studies. This means that when creating a BIM model, there is no need to input acoustic information, especially for passing elements (materials used), and only normal modeling rules are required. This allows for structural design without worrying about sound insulation design, further improving work efficiency.

[0072] (5) In acoustic analysis, simply by selecting the source room and receiving room on the floor plan and setting the calculation conditions, the sound pressure (noise) level, sound pressure level difference, and reverberation time can be automatically calculated, making it easy to operate even for users who are not experienced in sound insulation design. (6) In addition to being output in report format, the calculation results can also be output as visualized 2D views (Figures 7 and 8) or 3D views (Figure 9), allowing users to intuitively understand how sound propagates within a building. (7) In addition, the calculation report can identify propagation paths that contribute significantly to noise levels (Fig. 12), and case studies can be used to provide optimal sound insulation performance to the BIM model.

[0073] (8) It is possible to take into account not only the noise propagating inside the room, but also the calculation conditions for external leakage noise and external background noise, enabling more realistic sound insulation design. This allows reliable sound insulation performance to be demonstrated in the actual environment even after the building is completed.

[0074] The present invention is not limited to the above-described embodiment and can be implemented in various modifications. The building described in the embodiment is merely an example, and the present invention can be applied to buildings with various structures and purposes.

[0075] In one embodiment, the target range is designated as "room designation" from the viewpoint of calculation efficiency, but calculation may also be performed by designating "all rooms."

[0076] Furthermore, if an error occurs during model checking, the cause may be output to prompt the user to change the design conditions. In this case, the user can change the design of the building and set the rooms to be subjected to acoustic analysis before applying the present invention.

[0077] Furthermore, the system configuration example (FIG. 1) and procedure example (FIG. 2) are merely preferred examples, and the present invention can be implemented by appropriately modifying these. [Explanation of symbols]

[0078] 100 Acoustic Analysis System 120 Analysis model generation processing unit 130 Analysis condition setting processing section 140 Acoustic analysis processing unit 160 databases

Claims

1. A generation means for generating an analytical model that defines living spaces and multiple non-living spaces within a building using a BIM model that represents the structure and specifications of the building to be analyzed in three-dimensional data; a setting means for setting the number of passage elements through which sound passes as it propagates from a predetermined sound source room among the plurality of rooms to a sound receiving room to an arbitrary number; a search means for searching for a sound propagation path from the sound source room to the sound receiving room on the analysis model in accordance with the number of passing elements set by the setting means; a calculation means for extracting from the analysis model parameters present on the sound propagation path searched for by the search means according to the number of passing elements, and for calculating a sound pressure level in the sound receiving room with at least the sound source room as a sound source using the parameters; an output means for outputting the calculation result of the calculation means; Acoustic analysis system equipped with.

2. 2. The acoustic analysis system according to claim 1, The searching means An acoustic analysis system characterized in that it is possible to search for multiple sound propagation paths from the sound source room to the sound receiving room on the analysis model depending on the number of passing elements set by the setting means.

3. On the computer, a generation step of generating an analytical model that defines living spaces and multiple non-living spaces within the building using a BIM model that represents the structure and specifications of the building to be analyzed in three-dimensional data; a setting step of setting an arbitrary number of passage elements through which sound passes while propagating from a predetermined sound source room among the plurality of room spaces to a sound receiving room; a searching step of searching for a sound propagation path from the sound source room to the sound receiving room on the analysis model according to the number of passing elements set in the setting step; a calculation step of extracting from the analysis model parameters present on the sound propagation path searched for in the search step according to the number of passing elements, and calculating a sound pressure level in the sound receiving room with at least the sound source room as a sound source using the parameters; an output step of outputting the calculation result in the calculation step; An acoustic analysis program that executes the following:

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