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 for analyzing, for example, the noise level in a building using a BIM model.

Background Art

[0002] The noise level in a building occupies an important element in its habitability. Therefore, it is necessary to analyze the noise level in the building from the early stage of construction and take noise countermeasures such as reexamining the structure if necessary. For example, regarding the prediction of indoor noise, not only the partition walls in a house but also the influence of structures on the sound propagation path (rooms, corridors, atriums, etc.) assumed by the designer is detected on the floor plan, and the noise level through openings such as the area of the openings and the distance from the target is calculated from the noise level through the openings. Prior art of a housing design system is known (see, for example, Patent Document 1).

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] Although the prior art system can handle the noise prediction of houses with standard structures to some extent, it does not widely support buildings with various structures. That is, in recent years, the analysis targets of noise levels have diversified in structure depending on the purpose and type of buildings (for example, hotels, apartment houses, hospitals, factories, studios, etc.), and the wavelength range and magnitude of the noise generated in the target rooms (for example, lecture halls, conference rooms, cafeterias, banquet halls, machine rooms, etc.) provided in the buildings are variously different. Therefore, there is a limit to a system that only deals with the living noise in a house.

[0005] Therefore, the present invention provides an acoustic analysis technology corresponding to various 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 generates an analysis model using a BIM model of the building to be analyzed (generation means). The analysis model is a three-dimensional structural model that defines a number of rooms, including habitable rooms and other room spaces, within the building. The acoustic analysis system extracts various parameters from the analysis model that exist along the propagation path from a predetermined sound source room to a receiving room, and uses these parameters to calculate the sound pressure level of the receiving room with the sound source room as the sound source (calculation means). The acoustic analysis system then outputs the calculation result (output means). The acoustic analysis program causes a computer to perform the steps described above.

[0007] A BIM model represents the structure and specifications of a building in three dimensions and is created during the design phase. By using a BIM model, the area and volume of each room in the building, the distance between windows, etc., can be easily utilized in the analysis model generated from it. Furthermore, by using a BIM model to generate the analysis model, the structure of the building's partition walls, floors, and ceilings can also be easily utilized. This makes it possible to perform acoustic analysis under conditions similar to how sound propagates within an actual building, thereby increasing the reliability of the calculation results.

[0008] Furthermore, the analysis model performs calculations for sound propagation within "room spaces." Therefore, the acoustic analysis system of the present invention defines "room spaces" not only as living rooms within a building, but also as spaces outside of living rooms, such as attics and empty spaces. Then, by arbitrarily selecting the "sound source room" and "receiving room" from among the defined "room spaces," various parameters (e.g., sound transmission loss and sound absorption coefficient of various materials such as finishing materials, sashes, floors, and ceilings) present along the propagation path from the "sound source room" to the "receiving room" are extracted from the analysis model. This allows for acoustic analysis of sound propagation from an arbitrary "sound source room" in the analysis model to the "receiving room" using these various parameters, and the sound pressure level in the "receiving room" with the "sound source room" as the sound source is calculated. In addition, the sound pressure levels of each "room space" along the propagation path are also calculated, making it possible to analyze how sound propagates from the sound source room to the surrounding room spaces within the building.

[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. By referring to these calculation results, it is possible to consider noise countermeasures within the building being analyzed (such as whether the sound insulation is sufficiently or excessively designed, and whether the required performance is met).

[0010] In particular, when a building has large room spaces, the leakage of noise from a room space that acts as a "sound source room" (e.g., an auditorium, conference room, dining hall, banquet hall, machine room, etc.) to other rooms via partition walls, floors, and ceilings is a problem that requires noise countermeasures. Therefore, the acoustic analysis according to the present invention is extremely useful for noise countermeasures.

[0011] Preferably, when generating the analysis model, a check is performed to determine whether the rooms within the building are subjects for which sound pressure levels can be calculated. There are predetermined conditions for acoustic analysis to be possible for rooms that are designated as "sound receiving rooms," and once it is confirmed that the target rooms meet these predetermined conditions, room spaces are defined in all spaces other than the rooms and the analysis model is generated.

[0012] In some real buildings, the design of the rooms may make them unsuitable for acoustic (sound insulation) analysis. In such cases, a preliminary check is performed, and the analysis model is generated only if the target room is suitable for analysis. Such preliminary checks are easily implemented because the present invention uses BIM models of actual buildings to generate the analysis model.

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

[0014] This makes it possible to calculate sound pressure levels that take into account the sound propagation path from the sound source room to the receiving room, simply by arbitrarily setting the number of passing elements, even without expertise in acoustic analysis such as sound insulation.

[0015] Furthermore, in setting the calculation conditions, depending on the number of passage elements set, it is possible to set at least one of the following: internal noise that propagates through the inside of the building from the sound source room to the receiving room, wraparound noise that propagates from the sound source room to the receiving room through passage elements arranged along the outer wall surface, and external background noise that enters the receiving room from outside the building.

[0016] In other words, in noise countermeasures, there is a growing need to address not only railway and road traffic noise and internal noise from outdoor equipment, but also noise that enters the room through passing elements such as sashes and openings (louvers and ventilation openings) along the exterior wall surface, as well as noise that enters from the outside. For this reason, in this invention, when the number of passing elements is set to a certain level or more (for example, 4 to 5 or more), the sound pressure level in the sound receiving room is calculated by setting the passing sound and external background noise as calculation conditions. This ensures comprehensive measures against various types of noise.

[0017] In this invention, the locations of the room spaces that will serve as 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 for more intuitive setting of calculation conditions and enhances the convenience of acoustic analysis.

[0018] The acoustic analysis system of the present invention may include a database. The database contains pre-registered parameters such as sound transmission loss and sound absorption coefficient for various passage elements (finishing materials, sashes, floors, ceilings, etc.). This allows for accurate calculation of sound pressure levels by referencing the database and easily extracting parameters present along the sound propagation path during noise analysis.

[0019] Multiple types of materials are registered in the database, and any one can be selected from among them. If the previously selected material using parameters is changed, the sound pressure level is recalculated using the parameters of the changed material, and the revised calculation result can be output. This makes it easy to select a material that meets the required performance requirements for sound pressure level in a receiving room, for example, by appropriately changing the selected material while referring to the calculation result.

[0020] In addition, various types of noise source information are also registered in the database. The noise source information includes, in addition to the noise that can occur in the sound source room, information on external noise (such as railway and road traffic noise) that can occur outside the building. Therefore, acoustic analysis (noise propagation analysis within the analysis model) can be performed when noise is generated at various arbitrary locations inside and outside the building.

[0021] The calculation results of the acoustic analysis are in a format where the changes in sound pressure levels on a plurality of propagation paths from the sound source room to the receiving room are displayed as a plurality of transition graphs for each propagation path. Thus, it is possible to display and output a list of parameters existing on the propagation path corresponding to an arbitrary transition graph selected from the plurality of displayed transition graphs.

[0022] As a result, for example, it becomes possible to realize a mode in which the change in sound pressure level is graphically displayed on the screen of the device, and by clicking on the target graph with the GUI, the parameters of the structure (passing element) on the propagation path from the sound source room to the receiving room (observation point) are pop-up displayed.

[0023] In addition to the graph display format as described above, the calculation results can also be output in the form of a contour diagram display. In this case, for at least any one of the plan view, sectional view, or three-dimensional view of the building obtained from the analysis model, the distribution of sound pressure levels in other room spaces with the sound source room as the sound source can be visualized as a contour diagram. Since contour display is possible not only in two dimensions but also in three-dimensional solid diagrams (BIM models), it is possible to visually recognize how the noise spreads spatially within the building. As a result, the sound insulation effect within the building becomes clear, which can greatly contribute to the consideration of noise countermeasures.

[0024] In this way, in the present invention, by using the BIM model of a building for acoustic analysis, an actual structural model can be utilized, and acoustic analysis can be performed considering not only the partition walls within the building but also structures such as the partition floor and ceiling. Further, from the calculation results of the acoustic analysis, it becomes easier to distinguish between those for which measures can be taken by changing the material of the passing elements and those for which structural measures are necessary, and the man-hours required for noise countermeasures can be reduced.

Effect of the Invention

[0025] As described above, according to the present invention, an acoustic analysis technique corresponding to various buildings can be provided.

Brief Description of the Drawings

[0026] [Figure 1] It is a block diagram showing a configuration example of the acoustic analysis system 100. [Figure 2] It is a flowchart showing an example of the procedure of the acoustic analysis process executed by the acoustic analysis system 100. [Figure 3] It is a diagram showing an example of the generation of an analysis model. [Figure 4] It is a diagram showing an example of the execution of model checking in the generation of an analysis model. [Figure 5] It is a diagram showing an example of defining a plurality of room spaces in an analysis model. [Figure 6] It is a diagram showing an example of setting the number of sound passing elements from the sound source room to the sound receiving room. [Figure 7] It is a contour diagram showing an example of the result output of the acoustic analysis process. [Figure 8] It is a contour diagram showing another example of the result output for a two-dimensional plan view and a sectional view. [Figure 9] It is a contour diagram showing an example of the result output representing the result of the acoustic analysis process in a three-dimensional perspective view. [Figure 10] It is a diagram showing an example of the output in which the result of the acoustic analysis process is displayed in a sound pressure level calculation report. [Figure 11] It is a diagram showing an example of the output in which the result of the acoustic analysis process is displayed in a reverberation time calculation report. [Figure 12] This figure shows an example of a case study using the calculation results. [Modes for carrying out the invention]

[0027] Embodiments of the present invention will be described below with reference to the drawings. The following embodiments provide a preferred example of an acoustic analysis system and an acoustic analysis program, but the embodiments of the present invention are not limited to those described herein.

[0028] [Example of system configuration] Figure 1 is a block diagram showing an example configuration of the 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 according to one embodiment. The computer device 102 has a main unit 102a, a display 102b such as a liquid crystal display device, an input device such as a keyboard 102c and a mouse 102d. Note that the computer device 102 is not limited to a so-called desktop type, but may also be a notebook type (laptop type) or a tablet type, etc.

[0029] The acoustic analysis system 100 includes several functional elements implemented using the hardware resources of the computer equipment 102. These functional elements include basic components such as the control unit 110, input processing unit 112, output processing unit 114, and image processing unit 116, as well as core components specific to the acoustic analysis system 100, such as the analysis model generation processing unit 120, analysis condition setting processing unit 130, and acoustic analysis processing unit 140. Furthermore, a database 160 is constructed on the storage medium 150, which is a hardware resource, and this database 160 also constitutes the acoustic analysis system 100. The storage medium 150 is comprised of either internal or peripheral components of the computer equipment 102.

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

[0031] [Core elements] The analysis model generation processing unit 120 executes the process of generating an analysis model using the BIM model of the building. The BIM model used is the 3D structural model of the building that is the target of analysis in the acoustic analysis system 100. Note that the BIM model was created using a BIM tool other than the acoustic analysis system 100 (for example, REVIT: registered trademark). The analysis condition setting processing unit 130 executes the process of setting various analysis conditions that will be applied when performing acoustic analysis (sound insulation calculation). The acoustic analysis processing unit 140 executes acoustic analysis processing using the analysis model under the set analysis conditions. Details of the generation of the analysis model, setting of analysis conditions, and acoustic analysis processing will be described further later with reference to other drawings.

[0032] Furthermore, database 160 internally contains a "physical property database" and a "sound source database." The "physical property database" pre-registers physical property data such as sound transmission loss and sound absorption coefficient for each structural member located along the sound propagation path (e.g., walls, floors, ceilings, roofs, doors, windows, curtain walls, etc.) as parameters used in acoustic analysis (sound insulation calculations). The "sound source database" registers noise source information (e.g., machine operation sounds, speech, AV equipment sounds, musical instrument sounds, traffic noise, etc.) as sound source data necessary for acoustic analysis. The acoustic analysis processing unit 140 refers to database 160 when executing the analysis process and can extract noise source information and corresponding parameters as appropriate for use in calculations. Note that the data configuration registered in database 160 is not limited to the above.

[0033] [Add-in format] In this embodiment, the BIM tool execution processing unit 170 can be implemented in the computer device 102 as a separate configuration from the acoustic analysis system 100. The BIM tool execution processing unit 170 is an element that executes the above-mentioned BIM tool in the computer device 102 and is used by users such as building designers. In terms of hardware configuration, if the acoustic analysis system 100 and the BIM tool execution processing unit 170 coexist in the same computer device 102, 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 built as a tool specialized for acoustic analysis (sound insulation calculation). In this case, the configuration of the BIM tool execution processing unit 170 does not need to be implemented in the computer device 102.

[0034] [Acoustic analysis processing] Figure 2 is a flowchart showing an example of the acoustic analysis process performed by the acoustic analysis system 100. The acoustic analysis program of this embodiment causes the computer device 102 to execute the procedure shown in Figure 2. The procedure will be explained below in accordance with the example.

[0035] Step S100: The analysis model generation processing unit 120 acquires the BIM model of the structure to be analyzed. 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 implemented in the same hardware environment, the BIM model can be acquired from an external device via the input processing unit 112.

[0036] Step S102: The analysis model generation processing unit 120 executes the analysis model generation process. This process further includes the following detailed steps. (1) The acquired BIM model is duplicated and used as the basis for the analysis model. (2) Perform a model check to confirm whether the target room can be subjected to acoustic analysis (sound insulation calculation). For example, if the interior of the building is composed of curves, or if there are no floor instances, acoustic analysis will not be possible. Otherwise, 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 not only as habitable rooms within the structure, but also as any other space (e.g., attic, under the floor, corridors, passages, etc.). If an error occurs during the model check, the acoustic analysis system 100 temporarily exits the process and outputs an error message to the display 102b. On the other hand, if no error occurs, it outputs a message indicating that the model check is complete and proceeds to the next step S104.

[0037] Step S104: The analysis condition setting processing unit 130 executes the analysis condition setting process. In this process, the calculation conditions necessary for acoustic analysis are set. For example, the following conditions may be considered. (1) Setting the calculation target: Internal noise (walls, floors, doors, ceilings, etc.), window frame noise, and external background noise are set as conditions. (2) Setting the number of sound passage elements (passage members): The number of sound passage elements present on the sound propagation path from one sound source room to another (for example, 1 to 5) is set as a condition. (3) Setting of sound source room and sound receiving room: as specified from the floor plan (multiple selections possible). (4) Setting the noise source: Set the noise source as a condition by direct input or by selecting from the sample list (speech, musical performance, traffic noise).

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

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

[0040] Step S110: The acoustic analysis system 100 determines whether or not to perform a case study. The user can determine whether or not to perform a case study based on, for example, whether the sound pressure level of the receiving room falls within the range of the target sound insulation performance. In this process, the acoustic analysis system 100 displays a dialog message on the display 102b, for example, "Do you want to perform a case study?", along with buttons for options such as "Yes" and "No", and requests the user to input an operation. If the user inputs "Yes", the system determines that a case study is required (Yes) and repeats steps S104 and onward. If the user inputs "No", the system determines that a case study is not required (No) and terminates this process. Note that the final result output processing may be performed again after determining that a case study is not required (No). Furthermore, the acoustic analysis system 100 can automatically reflect the results of the case study into the original BIM model.

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

[0042] [Example of model check execution] Figure 4 shows an example of performing a model check when generating the analysis model AMD. As described above, when generating the analysis model AMD, a model check is performed on the model copied from the BIM model BMD to determine whether acoustic analysis (sound insulation calculation) is possible. In the example in Figure 4, a floor plan of a typical floor of the target building is used. This model check method is preferably used when the floor plan within the building is the same on all floors.

[0043] [Specifying the scope] Furthermore, there are several ways to define the scope of the rooms to be checked for model analysis: specifying all rooms (all rooms), specifying any room (room selection), and specifying an area enclosed by a floor plan and a rectangular frame (level / rectangular area selection). Of these, the most efficient method is to specify the target rooms using the "room selection" method. The example in Figure 4 uses the "room selection" method, where the area colored in the floor plan is designated as the target area.

[0044] The building in question contains several habitable rooms R1-R13 on a typical floor, as well as corridors CD leading to each room, a linen room RN and other non-habitable spaces (unmarked), an elevator hall EH, and an elevator shaft (unmarked). In this example, the scope of study is limited to the four habitable rooms R1-R4 facing the front of the building, the corridors CD leading to them, and the elevator hall EH. This is because, even without considering all habitable rooms R1-R13, performing acoustic analysis on structurally representative habitable rooms R1-R4 is sufficient to adequately evaluate the sound insulation performance of the entire building.

[0045] Then, the system checks whether the target range satisfies the calculation conditions described in the analysis model generation process (step S102 in Figure 2). If the calculation conditions are found to be satisfied, the model check is complete.

[0046] [Example of room space definition] Figure 5 shows an example of defining multiple room spaces in the analysis model AMD. The definition of room spaces is performed in the analysis model generation process described above (step S102 in Figure 2). Once the model check is complete, room spaces are defined for the target rooms R1 to R4, as well as for all other spaces, such as the ceiling spaces AT1 to AT4 and the underfloor spaces UF1 to UF4. Note that the ceiling spaces AT1 to AT4 and the underfloor spaces UF1 to UF4 are considered underfloor spaces or ceiling spaces from the perspective of rooms on other upper or lower floors. Here, we show an example of defining room spaces only for some rooms R1 to R4 on a typical floor, but the definition of room spaces is performed for the entire analysis model AMD (all floors and all rooms).

[0047] [Setting the number of elements to pass through] Figure 6 shows an example of setting the number of sound passage elements from the sound source room to the receiving room. For example, consider the case where a certain room R1 is set as the sound source room NS and the adjacent room R2 is set as the receiving room NR. In this case, the number of elements (members) through which sound passes between the sound source room NS and the receiving room NR can be arbitrarily set from a minimum of "1" to "5". The number of passage elements is set in the analysis condition setting process described above (step S104 in Figure 2). For example, when the number of passage elements (e.g., 1 to 5) is set by user operation, the sound propagation path is automatically searched by the analysis condition setting processing unit 130 according to that number and incorporated into the calculation conditions. The propagation path is searched for both a planar path (Figure 6 (A)) and a cross-sectional path (Figure 6 (B)).

[0048] [Example of a planar path 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. In propagation path TR1, there is a boundary wall WL as one passing element between the sound source room NS and the receiving room NR.

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

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

[0051] Then, if the number of elements traversed in the planar path is "4", an additional propagation path TR4 is searched. Propagation path TR4 is a path from the sound source room NS, through corridor CD, and then through other rooms R4 and R3 to the receiving room NR. This propagation path TR4 has four elements traversed: the door DR of the sound source room NS, the door DR of room R3, the partition wall WL between room R4 and room R3, and the partition wall WL between room R3 and the receiving room NR.

[0052] [External noise and ambient 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 window frame to the receiving room NR from outside the building. External background noise WN is background noise (traffic noise, urban noise, etc.) that enters the receiving room NR from the surrounding environment of the building.

[0053] [Cross-sectional path] 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. In the cross-sectional path as well, the propagation path TR1 has a boundary wall WL as one passing element between the sound source room NS and the receiving room NR.

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

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

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

[0057] [Example of acoustic analysis] As described above, once various calculation conditions are set in the analysis model AMD, sound insulation calculations are performed in the acoustic analysis process (step S106 in Figure 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 formula correspond to the structural dimensions obtained from the analysis model AMD and the physical properties of the materials used in the elements that pass through the propagation path. As described above, the physical properties of various materials are pre-registered in the database 160, so when performing acoustic analysis calculations, the necessary parameters can be easily extracted by referring to the database 160. If the physical properties of the designed material do not exist in the database 160, the acoustic analysis system 100 will display a message to that effect ("Physical property acquisition error") on the display 102b and present an existing template to allow the user to select the appropriate sound absorption coefficient and transmission loss.

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

[0060] In this example, the difference in sound pressure levels between rooms R1 to R4 is shown by the difference in color gradation in both the floor plan and the cross-section. Note that although the diagram uses grayscale, color gradation is actually used (the same applies hereafter). For example, if the sound pressure level of room R1, which is the sound source room NS, is shown as the maximum, then the sound pressure level of room R2, which is the receiving room NR, is the second highest, and it can be seen that the sound pressure level decreases as you move further away from the other rooms R3 and R4.

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

[0062] [Other example of result output (2)] Figure 9 is a contour map showing an example of the output result of the acoustic analysis process, represented as a three-dimensional perspective view (wireframe diagram). This example shows only one floor for ease of reading, but the three-dimensional output can be reflected as a contour display for the entire analysis model AMD. Therefore, the spread of noise from room R1, which is the sound source room NS, is displayed three-dimensionally in both the planar and cross-sectional directions of the building. By displaying it as a three-dimensional contour map, it is possible to visualize in three dimensions how noise originating from the sound source room spreads within the building, and further contribute to the evaluation of sound insulation performance.

[0063] [Example of sound pressure level calculation report output] Figure 10 shows an example of the output displayed in the sound pressure level calculation report, showing the results of the acoustic analysis process. In addition to the contour plots (Figures 7-9) mentioned earlier, the calculation results of the acoustic analysis process can also be output in report format. The sound pressure level calculation report includes, for example, the following items:

[0064] As shown in the upper part 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 CD is numerically displayed for each octave band center frequency (Hz). In addition, the sound pressure level (dBA) in the receiving room NR is numerically displayed for each propagation path for each octave band center frequency (Hz), and their combined value and noise class (NC value, N value) are also numerically displayed. Furthermore, the sound pressure level (dBA) of the sound source room and the sound pressure level (dBA) of the receiving room are numerically displayed for each octave band center frequency (Hz), and the sound insulation class, the sound pressure level difference between rooms (D value), is numerically displayed.

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

[0066] [Reverberation Time Calculation Report] Figure 11 shows an example of the output displayed in the reverberation time calculation report, showing the results of the acoustic analysis processing. The reverberation time calculation report includes, for example, the following items: the surface area (m²) of each interior finish (part). 2 The sound absorption coefficient is displayed numerically for each octave band center frequency (Hz), and from this, the sound absorption force (m 2 The octave band center frequency (Hz) is displayed numerically. In addition, the air absorption coefficient and sound field coefficient are displayed numerically as set conditions for each octave band center frequency (Hz), and the reverberation time (sec) is also displayed numerically for each octave band center frequency (Hz). Although not shown in the diagram, the optimal reverberation time (sec) and room volume (m³) are also displayed. 3 A graph showing the relationship between ( ) and ( ) may be attached to the report.

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

[0068] [Noise level trend graph (contribution graph)] Figure 12 (A): The noise level progression graph on the left plots the progression of noise levels from the sound source room to the intermediate room and then to the receiving room, categorized by propagation path. The plan and cross-sectional views on the right show the sound source room, intermediate room, and receiving room, as well as the sound propagation paths. Each curve in the noise level progression graph represents the progression of the noise level (dBA) along the corresponding propagation path.

[0069] In the case study, for example, it can be noted that propagation paths TR1, TR2, and TR3, enclosed by dashed lines in the graph, have a high contribution. Such noise level transition graphs can be displayed on the screen of display 102b, for example, and when the user clicks on the curve on the graph with the mouse 102d, 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 row of the corresponding propagation path on the report (noise level calculation sheet), which is not illustrated.

[0070] In Figure 12 (B), a case study screen is displayed. The lower section shows a list of physical properties M1 for the elements (rooms, corridors, doors, partition walls, floors, ceilings, etc.) present on the relevant propagation path, along with a menu (e.g., a dropdown menu accessed by clicking) to change the physical properties for each element. When the user changes the physical properties in the list M1, the calculation results are immediately reflected in the upper section's list of sound pressure levels for each receiving room M2. In this way, the material of the elements on the propagation path that contribute significantly to the noise level transition graph can be appropriately changed on the screen, and the calculation results after changing the calculation conditions such as physical properties can be immediately confirmed. Furthermore, the changed physical properties of the elements can be automatically reflected in the BIM model as described above.

[0071] The acoustic analysis system 100 of this embodiment offers the following advantages. (1) Information necessary for sound insulation design (sound propagation path, transmission points, interior finishes, area and volume of each part, distance between windows, etc.) can be extracted from a BIM model-based analysis model, and the indoor noise level can be automatically calculated. (2) Furthermore, when used simultaneously in a hardware environment with BIM tools implemented, it becomes an add-in tool (acoustic analysis program) that enables automatic calculation of indoor noise levels on the BIM tool. (3) Compared to conventional methods of extracting various calculation conditions from 2D drawings and performing spreadsheet calculations, this method can significantly reduce the workload of sound insulation design work (by more than 80%). (4) The BIM model created on the BIM tool side and the analysis model can be automatically linked through case studies to determine material properties. Therefore, when creating the BIM model, it is not necessary to input acoustic information, especially for through elements (materials used), and only the usual modeling rules are required. This makes it possible to perform structural design without worrying about sound insulation design, further improving work efficiency.

[0072] (5) In acoustic analysis, by simply selecting the sound source room and the 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 skilled in sound insulation design. (6) In addition to report format, the calculation results can also be output as visualized 2D views (Figures 7 and 8) and 3D views (Figure 9), making it possible to intuitively understand how sound propagates within a building. (7) Furthermore, the calculation report can identify propagation paths that contribute significantly to noise levels (Figure 12), and through case studies, the BIM model can be assigned optimal sound insulation performance.

[0073] (8) In addition to noise propagating within the room, the calculation conditions for external noise leakage and external background noise can also be taken into consideration, enabling a more realistic sound insulation design. As a result, even after the building is completed, it can reliably exhibit sound insulation performance in its actual environment.

[0074] The present invention is not limited to the embodiment described above and can be implemented in various ways. 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 was specified as "room specification" from the viewpoint of computational efficiency, but the calculation may also be performed by specifying "all rooms".

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

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

[0078] 100 Acoustic Analysis Systems 120 Analysis Model Generation Processing Unit 130 Analysis Condition Setting Processing Unit 140 Acoustic Analysis Processing Unit 160 databases

Claims

1. A generation means that generates an analysis model that defines habitable rooms and multiple other room spaces within a building, using a BIM model that represents the structure and specifications of the building to be analyzed as 3D data, A setting means that allows setting the number of passage elements through which sound passes during propagation from a predetermined sound source room to a sound receiving room among the aforementioned multiple room spaces to any number, A search means for searching the sound propagation path from the sound source chamber to the sound receiving chamber on the analysis model, according to the number of passage elements set by the setting means, A calculation means extracts parameters present on the sound propagation path explored by the search means according to the number of passing elements from the analysis model, and uses these parameters to calculate the sound pressure level of the receiving room with at least the sound source room as the sound source, Output means for outputting the calculation result of the calculation means An acoustic analysis system equipped with [specific features / equipment].

2. In the acoustic analysis system according to claim 1, The aforementioned search means is An acoustic analysis system characterized in that, depending on the number of passage elements set by the setting means, multiple sound propagation paths from the sound source room to the sound receiving room can be explored on the analysis model.

3. On the computer, The generation step involves creating an analysis model that defines habitable rooms and multiple non-habitable room spaces within a building using a BIM model that represents the structure and specifications of the building to be analyzed in 3D data, and A setting step in which the number of sound passage elements that sound passes through during propagation from a predetermined sound source room to a sound receiving room among the aforementioned multiple room spaces is set to an arbitrary number, A search step in which the sound propagation path from the sound source room to the sound receiving room is searched on the analysis model according to the number of transit elements set in the setting step, A calculation step in which parameters present on the sound propagation path explored in the exploration step according to the number of elements passing through are extracted from the analysis model, and the sound pressure level of the receiving room with at least the sound source room as the sound source is calculated using the parameters, An output step that outputs the calculation result from the calculation step mentioned above. An acoustic analysis program that performs this operation.

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