Floor impact sound level prediction system
The BIM-based floor impact sound level prediction system simplifies the calculation of noise levels by generating a simplified model and allowing user designation of sound sources and receiving rooms, facilitating easy verification and spatially varied output for improved building design.
Patent Information
- Application Number
- JP2024038936
- Authority / Receiving Office
- JP · JP
- Patent Type
- Applications
- Current Assignee / Owner
- Filing Date
- 2024-03-13
- Publication Date
- 2025-09-29
AI Technical Summary
Existing methods for predicting floor impact sound levels in buildings, particularly heavy impact noise, are time-consuming and require specialized engineering knowledge, as they rely on structural information that varies room to room, making it difficult for non-specialists to accurately assess and predict noise levels.
A floor impact sound level prediction system using a BIM model that generates a simplified model of the building structure, allowing users to designate sound source and receiving rooms, set excitation points, and calculate impact sound levels, with output in different colors and views to facilitate easy verification.
Enables non-specialist engineers to easily verify and predict floor impact sound levels, speeding up the calculation process and providing clear, spatially varied results for improved design considerations.
Smart Images
Figure 2025139866000001_ABST
Abstract
Description
[Technical Field]
[0001] The present invention relates to a floor impact sound level prediction system that predicts floor impact sound levels of buildings using a BIM model. [Background technology]
[0002] Non-Patent Document 1 proposes a prediction method using the "impedance method." [Prior art documents] [Non-patent literature]
[0003] [Non-Patent Document 1] Architectural Institute of Japan, "Floor Impact Sound Prevention Design for Buildings", Gihodo Publishing, November 2009 Summary of the Invention [Problem to be solved by the invention]
[0004] In apartment buildings and hotels, heavy floor impact noise caused by people walking or running on upper floors, and light floor impact noise caused by hard objects falling, can easily become a problem. Light floor impact noise can be relatively easily addressed by selecting floor finishing materials, but heavy floor impact noise is determined by structural conditions such as the type and thickness of the floor slab and beams, so it is necessary to properly predict and consider it from the early stages of design.
[0005] The design and structural information required for calculations using the "impedance method" proposed by the Architectural Institute of Japan (Non-Patent Document 1) often differs from room to room, even within the same building, and it takes a lot of time to extract information from drawings and conduct case studies of specification changes, etc.
[0006] Therefore, an object of the present invention is to provide a floor impact sound level prediction system that can be easily verified by people other than professional engineers. [Means for solving the problem]
[0007] The present invention employs the following solutions to solve the above-mentioned problems. Note that the following solutions are merely examples, and the present invention is not limited to these. The present invention can be an invention that includes at least one of the invention-specifying matters shown in the following solutions. Furthermore, each invention-specifying matter shown in the following solutions can be made into a subordinate concept by adding an element that limits the invention-specifying matter, or can be made into a superordinate concept by removing an element that limits the invention-specifying matter.
[0008] Solution 1: The floor impact sound level prediction system of this solution is a floor impact sound level prediction system that predicts the floor impact sound level of a building using a BIM model that represents the structure and specifications of the building to be analyzed in 3D data, and is equipped with a simple model generation means that generates a simple model that simply shows the building of the BIM model based on information about the beams and slabs of the BIM model, a designation information receiving means that receives designation information that designates at least the source room that is the source of the floor impact sound from the BIM model, a sound source room information acquisition means that acquires sound source room information about the sound source room from the BIM model, a sound receiving room information acquisition means that acquires sound receiving room information about the sound receiving room that receives the floor impact sound generated in the sound source room, a calculation means that calculates the floor impact sound level of the sound receiving room based on the simple model, the designation information, the sound source room information, and the sound receiving room information, and an output means that enables the calculation results of the calculation means to be output.
[0009] According to this solution, the user can check the floor impact sound level of the sound receiving room simply by specifying at least the sound source room, so even non-specialized engineers can easily verify it. In addition, according to this solution, a simplified model is generated that shows the building of the BIM model in a simplified manner, and the floor impact sound level of the sound receiving room is calculated using this simplified model, which can speed up the calculation processing speed.
[0010] Solution 2: The floor impact sound level prediction system of this solution is a floor impact sound level prediction system, characterized in that, in any of the solutions described above, the simple model generation means distinguishes between main girders and minor girders of the BIM model and generates the simple model.
[0011] According to this solution, a simplified model is generated by distinguishing between main and secondary beams in the BIM model, making it possible to accurately predict floor impact sound levels.
[0012] Solution 3: The floor impact sound level prediction system of this solution is a floor impact sound level prediction system characterized in that, in any of the solutions described above, the sound source room information acquisition means generates excitation point information regarding the excitation points of the sound source room based on the BIM model.
[0013] According to this solution, excitation point information relating to excitation points in the sound source room is generated, which makes it easy to set excitation points.
[0014] Solution 4: The floor impact sound level prediction system of this solution is a floor impact sound level prediction system, characterized in that in any of the solutions described above, the sound source room information acquisition means sets, as the excitation points, a plurality of points that are at least a predetermined distance away from the surrounding walls of the room and that are evenly distributed, including a central point near the center of the room.
[0015] According to this solution, a plurality of points are set as excitation points, so that it is possible to predict the floor impact sound level taking into consideration the influence of the plurality of excitation points.
[0016] Solution 5: The floor impact sound level prediction system of this solution is a floor impact sound level prediction system in which, in any of the solutions described above, the sound source room information acquisition means is capable of generating multiple patterns as the excitation point that can be selected by user operation.
[0017] According to this solution, it is possible to generate a plurality of patterns of excitation points that can be selected by a user operation, thereby widening the range of excitation point selection.
[0018] Solution 6: The floor impact sound level prediction system of this solution is a floor impact sound level prediction system that is characterized in that, in any of the solutions described above, the sound source room information acquisition means outputs, as the excitation point information, the distance from a specific corner of the slab that includes the excitation point to the excitation point.
[0019] According to this solution, the distance from a specific corner of the slab containing the excitation point to the excitation point is output as excitation point information, thereby reducing the burden on the user.
[0020] Solution 7: The floor impact sound level prediction system of this solution is a floor impact sound level prediction system, characterized in that, in any of the solutions described above, the output means, when displaying the calculation results for multiple sound receiving rooms, displays the calculation results in different colors according to the values of the calculation results.
[0021] According to this solution, the calculation results are displayed in different colors, which makes it easier to compare the verification results and the specification change results.
[0022] Solution 8: The floor impact sound level prediction system of this solution is a floor impact sound level prediction system characterized in that, in any of the solutions described above, the output means outputs at least a portion of the various numerical values used in the calculation by the calculation means.
[0023] According to this solution, at least a portion of the various numerical values used in the calculation by the calculation means is output, so that by outputting the various numerical values, it is possible to verify in detail which numerical values have problems.
[0024] Solution 9: The floor impact sound level prediction system of this solution is a floor impact sound level prediction system characterized in that, in any of the solutions described above, the output means outputs the calculation results of the calculation means to a plan view, cross-sectional view, or three-dimensional view of the building.
[0025] According to this solution, the calculation results are output on a plan view, cross section, or three-dimensional view of the building, making it possible to easily see how floor impact sound levels vary spatially within the building.
[0026] Other solutions: The floor impact sound level prediction program of this solution is a floor impact sound level prediction program that predicts the floor impact sound level of a building using a BIM model that represents the structure and specifications of the building to be analyzed in three-dimensional data, and causes a computer to execute the following floor impact sound level prediction programs: a simple model generation step that generates a simple model that simply shows the building of the BIM model based on information about the beams and slabs of the BIM model; a designation information reception step that receives designation information that designates at least the source room that is the source of the floor impact sound from the BIM model; a sound source room information acquisition step that acquires source room information about the source room from the BIM model; a sound receiving room information acquisition step that acquires sound receiving room information about the sound receiving room that receives the floor impact sound generated in the sound source room from the BIM model; a calculation step that calculates the floor impact sound level of the sound receiving room based on the simple model, the designation information, the sound source room information, and the sound receiving room information; and an output step that enables output of the calculation results of the calculation step.
[0027] The floor impact sound level prediction program causes a computer to execute steps that execute each function of the floor impact sound level prediction system described above. According to this solution, the floor impact sound level prediction system described above can be realized by the floor impact sound level prediction program. Note that the configuration (operation, processing) of each of the above-described solution means can be converted into program processing (steps) and applied to the floor impact sound level prediction program. [Effects of the Invention]
[0028] According to the present invention, it is possible to provide a floor impact sound level prediction system that can be easily verified by people other than professional engineers. [Brief explanation of the drawings]
[0029] [Figure 1] FIG. 1 is a block diagram showing an example of the configuration of a floor impact sound level prediction system 100. [Figure 2] 10 is a flowchart showing an example of the procedure of floor impact sound level prediction processing executed by the floor impact sound level prediction system 100. [Figure 3] FIG. 1 is a diagram showing a BIM model. [Figure 4] FIG. 10 is a diagram illustrating an example of generating a simple model. [Figure 5] This is a diagram showing an example of specifying the rooms to be calculated (sound source room and sound receiving room). [Figure 6] FIG. 10 is a diagram illustrating an example of setting vibration point positions. [Figure 7] FIG. 10 is a diagram showing an example of presentation of excitation points. [Figure 8] FIG. 10 is a diagram showing an example of distance measurement from a reference point in a sound source room. [Figure 9] FIG. 10 is a diagram illustrating an example of acquiring sound receiving room information. [Figure 10] FIG. 10 is a diagram showing an example of a result display of floor impact sound levels. [Figure 11] FIG. 10 is a diagram showing an example of an output in which the calculation results of the heavy floor impact sound level are displayed in a calculation report. [Figure 12] FIG. 10 is a diagram showing an example of an output in which the calculation results of the heavy floor impact sound level are displayed in a calculation report. [Figure 13] FIG. 10 is a diagram showing an example of an output in which the calculation results of the light floor impact sound level are displayed in a calculation report. [Figure 14] FIG. 10 is a diagram showing an example of an output in which the calculation results of the light floor impact sound level are displayed in a calculation report. DETAILED DESCRIPTION OF THE INVENTION
[0030] Hereinafter, an embodiment of the present invention will be described with reference to the drawings. In the following embodiment, a preferred example of a floor impact sound level prediction system and a floor impact sound level prediction program is given, but the form of the present invention is not limited to the example.
[0031] [System configuration example] 1 is a block diagram showing an example of the configuration of a floor impact sound level prediction system 100. The floor impact sound level prediction system 100 is configured, for example, with a computer device 102 as hardware, and functions when the computer device 102 executes a floor impact sound level prediction program of one embodiment. In addition to a main body 102a, the computer device 102 has a display 102b such as a liquid crystal display device as a display device, and a keyboard 102c, a mouse 102d, etc. as input devices. 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, etc.
[0032] The floor impact sound level prediction system 100 includes several functional elements realized using the hardware resources of the computer equipment 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 (output means), and an image processing unit 116 (output means), as well as core elements such as a simple model generation processing unit 120 (simple model generation means), a specified information reception processing unit 122 (specified information reception means), a sound source room information acquisition processing unit 124 (sound source room information acquisition means), a sound receiving room information acquisition processing unit 126 (sound receiving room information acquisition means), a calculation processing unit 128 (calculation means), and a judgment processing unit 130 (judgment means) that are specialized for the processing of the floor impact sound level prediction system 100. Details of the processing performed by each processing unit of the core elements will be described later with reference to other drawings. In addition, a database 160 is constructed in a storage medium 150, which is a hardware resource, and this database 160 also constitutes the floor impact sound level prediction system 100. The storage medium 150 may be a built-in device of the computer device 102 or a peripheral device.
[0033] [Basic elements] The control unit 110 controls the overall processing within the floor impact sound level prediction system 100. Furthermore, the input processing unit 112 and the output processing unit 114 perform processing for inputting and outputting signals to and from devices such as the keyboard 102c and the mouse 102d, and inputting and outputting data signals to and from external connection destinations using various communication protocols. Furthermore, the output processing unit 114 performs processing for outputting the analysis results of the floor impact sound level prediction system 100, and the image processing unit 116 performs image processing for displaying the output results of the output processing unit 114 as images on the display 102b. In other words, the output processing unit 114 and the image processing unit 116 enable the calculation results (calculation results) of the calculation processing unit 128 to be output.
[0034] Furthermore, the database 160 can store various data and analysis results required for the floor impact sound level prediction system 100.
[0035] [Add-in format] In this embodiment, a BIM tool execution processing unit 170 can be implemented in the computer equipment 102 as a separate component from the floor impact sound level prediction system 100. The BIM tool execution processing unit 170 is an element that executes the above-mentioned BIM tool in the computer equipment 102, and is used by a user such as a building designer, for example. When the floor impact sound level prediction system 100 and the BIM tool execution processing unit 170 coexist in the same computer equipment 102 in terms of hardware configuration, the floor impact sound level prediction system 100 of this embodiment can be used as an add-in to the BIM tool. Note that the floor impact sound level prediction system 100 does not always need to be used in an add-in format, and may be constructed as a tool specialized for building analysis. In this case, the configuration of the BIM tool execution processing unit 170 does not need to be implemented in the computer equipment 102.
[0036] [System Overview] The floor impact sound level prediction system 100 is outlined below. The floor impact sound level prediction system 100 is a system that analyzes a building using a BIM model (CAD model) that represents the structure and specifications of the building to be analyzed as three-dimensional data. The BIM model is created at the design stage, and by using the BIM model, it is possible to easily use information such as the area and volume of each room in the building and information about slabs. The BIM model is created using a BIM tool (for example, REVIT: registered trademark) or a CAD tool that is different from the floor impact sound level prediction system 100. The floor impact sound level prediction system 100 provides a method for predicting floor impact sound levels within a building using a BIM model.
[0037] In the floor impact sound level prediction system 100, users can simply select the source room and the receiving room on the BIM model to extract structural information such as slab type, area, thickness, and support conditions required for impedance method calculations, as well as design information such as the sound absorption capacity and floor finish of the room, and instantly predict floor impact sound levels.
[0038] The following is an outline of the presettings, input information, internal processing, and output information of the floor impact sound level prediction system 100. [Pre-setting] A simple model (rectangular area) is automatically generated based on beam and slab information. [Input information] (1) Sound source room, sound receiving room (multiple rooms can be specified): Specify from floor plan (2) Design target value (cannot be set)
[0039] [Internal processing] (1) Acquisition of sound source room information (setting excitation points appropriate for the room shape, floor finish, etc.) (2) Calculate the impedance level at each excitation point from the simplified model and sound source room information (3) Acquisition of sound receiving room information (effective radiation area, indoor sound absorption capacity, etc.) (4) Calculation of floor impact sound level for each excitation point
[0040] [Output information] (1) Floor impact sound level: Heavy floor impact sound level (LH), Light floor impact sound level (LL) (2) Required floor performance: When the design target is not achieved (when the design target value is set) (3) Display of results using calculation reports: Floor impact sound levels are displayed in color in plan views, cross-section views, and three-dimensional views (3D views).
[0041] [Floor impact sound level prediction processing] Fig. 2 is a flowchart showing an example of the procedure of floor impact sound level prediction processing executed by the floor impact sound level prediction system 100. The floor impact sound level prediction program of this embodiment causes the computer equipment 102 to execute the procedure (each step) of Fig. 2. The example of the procedure will be explained below.
[0042] Step S100: The simple model generation processing unit 120 acquires a BIM model of the building to be analyzed this time (acquisition step). 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.
[0043] The simple model generation processing unit 120 can execute a judgment process (judgment step). The judgment process is a process that checks the BIM model and judges whether the building has been modeled correctly. For example, the simple model generation processing unit 120 can judge that the building has not been modeled correctly if the main beams, sub-beams, or center lines have not been modeled, or if there are holes in the floor of the structure. If an error occurs in the judgment process, the floor impact sound level prediction system 100 temporarily exits the process and executes a process to output an error message to the display 102b. On the other hand, if no error occurs, a process to output a message indicating that the model check has been completed is executed, and the next step S102 can be executed.
[0044] Step S102: The simple model generation processing unit 120 executes a simple model generation process (simple model generation step). The simple model generation process is a process for generating a simple model (rectangular area) that simply represents the building of the BIM model based on information about the beams and slabs of the BIM model. The simple model generation processing unit 120 can also generate a simple model by distinguishing between the main beams and sub-beams of the BIM model.
[0045] Step S104: The designation information reception processing unit 122 executes designation reception processing (designation reception step). The designation reception processing is processing for receiving designation information that designates, from the simple model, a sound source room that is a source of floor impact noise and a sound receiving room that receives the floor impact noise generated in the sound source room. The user operates the keyboard 102c, mouse 102d, etc. to designate the sound source room and the sound source room.
[0046] Step S106: The sound source room information acquisition processing unit 124 executes sound source room information acquisition processing (sound source room information acquisition step). The sound source room information acquisition processing is processing for acquiring sound source room information related to the sound source room from the BIM model. The sound source room information is, for example, information about the sound source room included in the design information and structural information of the BIM model, and is information required for floor impact sound level prediction processing. In addition, the sound source room information acquisition processing unit 124 can generate excitation point information related to the excitation points of the sound source room based on the BIM model.
[0047] Step S108: The sound receiving room information acquisition processing unit 126 executes sound receiving room information acquisition processing (sound receiving room information acquisition processing step). The sound receiving room information acquisition processing is a process for acquiring sound receiving room information related to the sound receiving room from the BIM model. The sound receiving room information is, for example, information about the sound receiving room included in the design information and structural information of the BIM model, and is information required for floor impact sound level prediction processing.
[0048] Step S110: The calculation processing unit 128 executes a calculation process (calculation step). The calculation process is a process for calculating the floor impact sound level of the sound receiving room based on the simple model, the specification information, the sound source room information, and the sound receiving room information. The calculation processing unit 128 can also calculate the floor impact sound level of the sound receiving room by adding the information of the BIM model to these pieces of information.
[0049] Step S112: The output processing unit 114 and the image processing unit 116 execute a result output process (output step). The result output process is a process for displaying the results of the calculation process on the display 102b. When displaying the calculation results for multiple sound receiving rooms, the output processing unit 114 and the image processing unit 116 can display the calculation results in different colors according to the values of the calculation results. An example of the output of the calculation results will be further described using another drawing.
[0050] Step S114: The floor impact sound level prediction system 100 determines whether or not to execute a case study. The user can determine whether or not to execute a case study, for example, based on whether the floor impact sound level of the sound receiving room is within a range of a predetermined target value. In this process, the floor impact sound level prediction system 100 displays, 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," requesting the user to input an operation.
[0051] As a result, if the user inputs "Yes", it is determined that there is a case study (Yes), and step S104 and subsequent steps are executed again. If the user inputs "No", it is determined that there is no case study (No), and this processing ends. Note that after determining that there is no case study (No), the final result output processing may be performed again. Furthermore, the results of the case study can be automatically reflected in the original BIM model by the floor impact sound level prediction system 100.
[0052] [BIM model] Figure 3 is a diagram showing a BIM model. The BIM model includes design information shown in Figure 3(A) and structural information shown in Figure 3(B). The design information includes information on interior finishes, surface area, room volume, etc. The structural information includes information on slab type, slab structure, slab area, slab thickness, slab support conditions, information on girders and sub-girders, and information on center lines.
[0053] [Example of generating a simple model] Fig. 4 is a diagram showing an example of generating a simple model. In the above-mentioned simple model generation process (step S102 in Fig. 2), the simple model generation processing unit 120 automatically generates a simple model (rectangular area) of beams and slabs based on information on girders and sub-girders and information on grid lines included in the structural information. If the information on girders and sub-girders can be accurately grasped, the simple model generation processing unit 120 generates a simple model based on the information on girders and sub-girders. On the other hand, if the information on girders and sub-girders cannot be accurately grasped, or if position information on girders and sub-girders does not exist, the simple model is generated based on the information on grid lines.
[0054] Specifically, as shown in Figure 4(A), the shape and position information of the main girders, the shape and position information of the sub-girders, the slab structure, etc. are extracted from the BIM model, and a simple model of the beams and slabs is automatically generated, as shown in Figure 3(B). Here, there are cases where the original BIM model is not modeled correctly (the main girders and sub-girders are set in reverse). In such cases, the user can adjust the settings of the main girders and sub-girders so that they are correct (the settings of the main girders and sub-girders can be changed by user input).
[0055] The simplified model of beams and slabs includes beam type, beam width, beam depth, and slab structure information. In the simplified model of Figure 4(B), main girders are shown with thick lines and integers of X and Y, and sub-girders are shown with thin lines and integers and decimals of X and Y.
[0056] The distinction between main beams and minor beams can be used in determining the slab edge support conditions and sound receiving room edge support conditions when calculating floor impact sound levels.
[0057] [Example of specifying the rooms to be calculated (sound source room and sound receiving room)] 5 is a diagram showing an example of designation of rooms to be calculated (sound source room and sound receiving room). In the designation reception process (step S104 in FIG. 2), the designation information reception processor 122 executes a process of receiving designation of rooms to be calculated (sound source room, sound receiving room) on a floor plan by user's operation input.
[0058] In this example, the sound source room is set to the bedroom of the second-lowest dwelling unit C on the fourth floor, and the sound receiving room is set to the bedroom of the second-lowest dwelling unit C on the third floor. The room to be calculated can be specified as the entire dwelling unit, or as a partial area within the dwelling unit (for example, a bedroom).
[0059] In addition, when specifying the rooms to be calculated, multiple receiving rooms may be specified for one source room, or one receiving room may be specified for multiple source rooms. However, it is preferable to specify the area directly below the specified source room as the receiving room. Furthermore, when a source room is specified, it is also possible to automatically specify the area directly below it as the receiving room.
[0060] [Example of setting the excitation point position] Figure 6 is a diagram showing an example of setting the excitation point position. In the above sound source room information acquisition process (step S106 in Figure 2), the sound source room information acquisition processing unit 124 acquires the sound source room information from the BIM model, and then sets the position of the excitation point. Note that the excitation point refers to the location in the sound source room where vibration is applied. The sound generated in the sound receiving room changes depending on the position of the excitation point. Furthermore, the excitation force applied to the excitation point uses a constant value for heavy impact sound or light impact sound.
[0061] The sound source room information acquisition processing unit 124 automatically sets five excitation points (multiple excitation points S1 to S5) that are more than 500 mm (predetermined distance) away from the peripheral wall of the room and are evenly distributed, including one point near the center of the room (center point, excitation point S3).
[0062] Furthermore, if the shape of the room is complex, the sound source room information acquisition processing unit 124 can have the program present multiple patterns, allowing the user to select the most suitable one (multiple excitation point patterns can be generated that can be selected by user operation). Note that the excitation points can also be set manually by the user one by one.
[0063] [Example of excitation points] FIG. 7 is a diagram showing an example of presentation of excitation points. (First pattern) The first pattern is a pattern in which the excitation point is calculated from the reference line (cross mark) of the room. Since the BIM model may have a reference line set, the first pattern uses that reference line. In the first pattern, the intersection of the reference lines becomes the center point (excitation point S3), and the equal division points of the reference lines become the other points (excitation points S1, S2, S4, S5).
[0064] (Second pattern) The second pattern is one in which the intersection of the diagonal lines of a rectangle and the points at which the diagonal lines are equally divided are the excitation points. If the shape of the room is rectangular, the intersection of the diagonal lines of the rectangle is the center point (excitation point S3), and the points at which the diagonal lines of the rectangle are equally divided are the other points (excitation points S1, S2, S4, S5). If the shape of the room is uneven, a circumscribed rectangle is set, and the intersection of the diagonal lines of the circumscribed rectangle is the center point (excitation point S3), and the points at which the diagonal lines of the circumscribed rectangle are equally divided are the other points (excitation points S1, S2, S4, S5). If the shape of the room is uneven, an inscribed rectangle is set, and the intersection of the diagonal lines of the inscribed rectangle is the center point (excitation point S3), and the points at which the diagonal lines of the inscribed rectangle are equally divided are the other points (excitation points S1, S2, S4, S5).
[0065] The sound source room information acquisition processor 124 generates at least one excitation point pattern based on the first pattern and the second pattern, and the user can select one of the generated patterns. The user can set all excitation points by himself / herself, or can change the position of at least one excitation point in the presented patterns.
[0066] [Distance measurement example] 8 is a diagram showing an example of distance measurement from a reference point of the sound source room. The sound source room information acquisition processor 124 outputs the distance from the slab end (reference point S0, a specific corner of the slab including the excitation point) that is most affected by constraints to each excitation point as excitation point information. As a result, information on the five excitation points S1 to S5 is output as follows. The specific corner can be the corner that is closest to any of the five excitation points S1 to S5.
[0067] Distance (m) of excitation point S1 from reference point S0: X1 (X direction), Y1 (Y direction) Distance (m) of excitation point S2 from reference point S0: X2 (X direction), Y2 (Y direction) Distance (m) of excitation point S3 from reference point S0: X3 (X direction), Y3 (Y direction) Distance (m) of excitation point S4 from reference point S0: X4 (X direction), Y4 (Y direction) Distance (m) of excitation point S5 from reference point S0: X5 (X direction), Y5 (Y direction)
[0068] The output distances of the excitation points S1 to S5 from the reference point S0 are used as correction values when correcting the basic impedance level for the influence of peripheral constraints on the excitation force.
[0069] [Sound Receiving Room Information] FIG. 9 is a diagram showing an example of acquiring sound receiving room information. For example, sound absorption power and effective radiation area are acquired as sound receiving room information. λ=340 / f, where λ indicates wavelength (m) and f indicates frequency (Hz). The effective radiation area is the area of the radiation area that overlaps with the area to be predicted. For example, if the sound receiving room is a bedroom (BR) of dwelling unit C on the third floor, the area where the bedroom (BR) overlaps with radiation area E1 (the central area of the slab (the area excluding 1 / 4λ length from the edge)) where the slab is actually vibrating strongly is the effective radiation area E2.
[0070] [Calculation of floor impact sound level] Floor impact sound levels are calculated based on the "impedance method" proposed by the Architectural Institute of Japan. Two types of floor impact sound levels are calculated: heavy floor impact sound levels and light floor impact sound levels.
[0071] The heavy floor impact sound level is calculated based on the following formula (1).
[0072]
number
[0073] The light floor impact sound level is calculated based on the following (Equation 2).
[0074]
number
[0075] Then, when the calculation process is completed, the calculation results are output in the result output process (step S112 in FIG. 2). Specifically, the floor impact sound levels are displayed in different colors on the plan view, cross section view, and three-dimensional view, and a calculation report is also output.
[0076] [Example of result display] Figure 10 shows an example of the result display of floor impact sound levels. Figure 10(A) is a plan view showing an example of the result display of floor impact sound levels, and Figure 10(B) is a cross-sectional view showing an example of the result display of floor impact sound levels.
[0077] In the example of Fig. 10, floor impact sound level prediction processing is performed on a six-story building. As shown in Fig. 10(B), the six-story building consists of an underground pit, tenants (1st floor, 2nd floor), dwelling units (3rd floor to 6th floor), and a rooftop (RFL). The sound source rooms are the bedrooms of all dwelling units on the fourth to sixth floors, and the sound receiving rooms are the bedrooms of all dwelling units on the third to fifth floors. In the bedrooms of each room, the "heavy floor impact sound level (e.g., LH55, LH50, etc.)" and "light floor impact sound level (e.g., LL50, etc.)" obtained by the floor impact sound level prediction processing are displayed. The floor impact sound level is displayed in the sound receiving room.
[0078] In addition, in the plan views and cross-sectional views, differences in floor impact sound levels are shown by differences in color gradation. Although the figures are shown in gray gradation, in reality color gradation is used, and the user can change the color gradation as desired. For example, in the plan view shown in Figure 10(A), it can be seen that the heavy floor impact sound levels of the bedrooms of the bottom three dwelling units on the left are high, and the heavy floor impact sound levels of the bedrooms of the other dwelling units are low. Also, in the cross-sectional view shown in Figure 10(B), it can be seen that the heavy floor impact sound levels and heavy floor impact sound levels of the 3rd to 5th floors are the same value. The views related to Figure 10(A) and Figure 10(B) can be switched between or displayed simultaneously by user operation input.
[0079] More specifically, by looking at the floor plan in Figure 10(A), the following can be seen: The room in the upper left of Figure 10(A) (for example, the bedroom in dwelling unit A on the third floor) and the rooms on the right (for example, the bedrooms in dwelling units B, D, E, and G on the third floor) are displayed in the same color (dark gray), so it can be seen that parts of the same color have the same floor impact sound level (heavy-duty floor impact sound level (LH) = 50, light-duty floor impact sound level (LL) = 50).
[0080] Furthermore, the rooms from the second to fifth from the top on the left side of Figure 10(A) (for example, the bedrooms of units C and F on the third floor) are displayed in the same color (light gray), so it can be seen that the parts of the same color have the same floor impact sound level (heavy-duty floor impact sound level (LH) = 55, light-duty floor impact sound level (LL) = 50).
[0081] Furthermore, by looking at the cross-sectional view in Figure 10(B), the following can be seen: The rooms on the third to fifth floors in Figure 10(B) (for example, the bedrooms of dwelling units B, D, E, and G on the third to fifth floors) are displayed in the same color (dark gray), so it can be seen that the parts of the same color have the same floor impact sound level (heavy-duty floor impact sound level (LH) = 50, light-duty floor impact sound level (LL) = 50).
[0082] Although not specifically shown, the floor impact sound level can also be shown in a three-dimensional diagram. In this way, the calculation result of the floor impact sound level can be displayed as a contour on a two-dimensional plan view, a two-dimensional cross-sectional view, or a three-dimensional solid view (3D view, perspective view, wireframe view). In other words, the input processing unit 112 and the output processing unit 114 can output the calculation result (floor impact sound level) of the calculation processing unit 128 to a plan view, cross-sectional view, or solid view of the building.
[0083] [Heavy-duty floor impact sound level calculation report] Figures 11 and 12 are diagrams showing output examples in which the calculation results of heavy floor impact sound levels are displayed in a calculation report. The calculation results of heavy floor impact sound levels can also be output in report format. That is, the input processing unit 112 and the output processing unit 114 are capable of outputting at least a part of the various numerical values used when calculating the heavy floor impact sound level in the calculation process of the calculation processing unit 128. Figures 11 and 12 show calculation sheets for heavy floor impact sound levels that comply with the calculation method based on the impedance method of the Architectural Institute of Japan.
[0084] The upper left section of Figure 11 displays the building name (apartment building A), slab type (ordinary concrete slab), floor finish specifications (dry double floor A), and ceiling specifications (gypsum board t12.5mm), and below that, image data of the sound source room (4th floor apartment C bedroom (BR)) and sound receiving room (3rd floor apartment C bedroom (BR)) specified by the user is displayed.
[0085] The upper right section of Figure 11 displays the conditions (double floor), sound source room (4F (C type) BR), sound receiving room (3F (C type) BR), and design target values (LH-55 Apartment complex / hotel; Grade 2 School; Grade 1), and below that, the input information (Input) is displayed. Input information includes, for example, the (equivalent) slab thickness h (m), the (equivalent) density of the slab ρ (kg / m 3 ), the (equivalent) Young's modulus of the slab E (N / m 2 ), slab short side length (m), slab long side length (m), slab area (m 2 ), distance from the reference point to the excitation point (m), support conditions at the end of the sound receiving room, floor dimensions of the sound receiving room in the short side direction of the slab (m), floor dimensions of the sound receiving room in the long side direction of the slab (m), floor (slab) area of the sound receiving room (m 2 ), total surface area of the sound receiving room (m 2 ), the average sound absorption coefficient of the sound receiving room, the improvement in heavy-duty floor impact sound level of the surface finishing material (dB), and the improvement in heavy-duty floor impact sound level of the ceiling (dB). The input information is generated based on the sound source room information and the sound receiving room information.
[0086] The output information is displayed in the lower part of Figure 11. The output information is, for example, "(1) Impact force level (dB) Weight impact source (tire: 520-10·Pr, air pressure 1.5×10 5Pa, 90cm free fall)", "(2) Impact frequency fn (Hz)", "(3) Basic impedance level of the structural floor 20log10(Zb) (dB)", "(4) Wavelength of bending wave of impact frequency fn λ (m)", "(5) Amount of increase in impedance level at the impact point (dB)", "(6) First natural frequency of the slab fo = 0.8 × fo,fix (Hz)", "(7) Amount of impedance level correction due to resonance (dB)", "(8) Impedance level of the structural floor at each impact point (dB)", "(9) Wavelength of bending wave (m)", "(10) Effective radiation area S (m 2 )", "(11) 10log10(S)(dB)", "(12) Slab coincidence critical frequency fc", "(13) Acoustic radiation coefficient k fc or less -5dB / OCT", "(14) 10log10(k)(dB)", "(15) Sound receiving room (lower room) surface area (m 2 )", "(16) Sound receiving room (lower room) average sound absorption coefficient α", "(17) Sound receiving room (lower room) sound absorption power A(m 2 ), "(18) 10log10(A)(dB)", "(19) Sound level meter dynamic characteristic correction amount (dB)", "(20) Floor impact sound level (dB) bare slab", "(21) Floor impact sound improvement amount by surface finishing (dB)", "(22) Floor impact sound improvement amount by sound-insulating ceiling (dB)", "(23) Calculation result Floor impact sound level (dB) L number, L value", "Design target value (LH-55 Apartment building / hotel: Class 2 School: Class 1)", "Judgment", and "Margin (dB)" are displayed. Each item is displayed as necessary.
[0087] The report also displays various numerical values and graphs, as shown in Figure 12. The various numerical values show some of the values shown in Figure 11. The vertical axis of the graph shows the heavy floor impact sound level (dB), and the horizontal axis of the graph shows the octave band center frequency (Hz). The graph displays the heavy floor impact sound level for each frequency generated in the sound receiving room. The dots indicated by circles (○) in the figure are the calculation results (prediction results) of the heavy floor impact sound level. The thick black line on the graph indicates the design target value (LH-55 in the example shown). By looking at the graph, it is possible to compare the prediction results with the design target value.
[0088] [Lightweight floor impact sound level calculation report] Figures 13 and 14 are diagrams showing output examples in which the calculation results of the light floor impact sound level are displayed in a calculation report. The calculation results of the light floor impact sound level can also be output in report format. In other words, the input processing unit 112 and the output processing unit 114 are capable of outputting at least a part of the various numerical values used when calculating the light floor impact sound level in the calculation process of the calculation processing unit 128. Figures 13 and 14 show calculation sheets for the light floor impact sound level that comply with the calculation method based on the impedance method of the Architectural Institute of Japan.
[0089] The upper left section of Figure 13 displays the building name (apartment building A), slab type (ordinary concrete slab), floor finish specifications (dry double floor A), and ceiling specifications (gypsum board t12.5mm), and below that, image data of the sound source room (4th floor apartment C bedroom (BR)) and sound receiving room (3rd floor apartment C bedroom (BR)) specified by the user is displayed.
[0090] The upper right section of Figure 13 displays the conditions (double floor), sound source room (4F (C type) BR), sound receiving room (3F (C type) BR), and design target values (LL-50 Apartment building / Hotel; Grade 2 School; Special Grade), and below that, the input information (Input) is displayed. Input information includes, for example, the (equivalent) slab thickness h (m), the (equivalent) density of the slab ρ (kg / m 3 ), the (equivalent) Young's modulus of the slab E (N / m 2 ), slab short side length (m), slab long side length (m), slab area (m 2 ), Floor dimensions of the sound receiving room in the short side direction of the slab (m), Floor dimensions of the sound receiving room in the long side direction of the slab (m), Floor (slab) area of the sound receiving room (m 2 ), total surface area of the sound receiving room (m 2 ), the average sound absorption coefficient of the sound receiving room, the improvement in heavy-duty floor impact sound level of the surface finishing material (dB), and the improvement in heavy-duty floor impact sound level of the ceiling (dB). The input information is generated based on the sound source room information and the sound receiving room information.
[0091] The output information is displayed in the lower part of Fig. 13. The output information includes, for example, "(1) Impact force level (dB) tapping machine (steel hammer 0.5 kg, drop height 4 cm, 10 hits / second)", "(2) Basic impedance level of the structural floor 20 log10(Zb) (dB)", "(3) 60 dB decay time T60 (sec)", "(4) 10 × log10(T60) (dB)", "(5) Coincidence limit frequency fc of the slab", "(6) Acoustic radiation coefficient k -5 dB / OCT below fc", "(7) 10 log10(k) (dB)", "(8) 10 × log10(h) (dB)", and "(9) Sound receiving room (lower room) surface area (m 2 )", "(10) Sound receiving room (lower room) average sound absorption coefficient α", "(11) Sound receiving room (lower room) sound absorption power A(m 2 ), "(12) 10log10(A)(dB)", "(13) Sound level meter dynamic characteristic correction amount (dB)", "(14) Floor impact sound level (dB) bare slab", "(15) Floor impact sound improvement amount by surface finishing (dB)", "(16) Floor impact sound improvement amount by sound-insulating ceiling (dB)", "(17) Calculation result (floor impact sound level (dB), L number, L value)", "Design target value (LL-50 Apartment building / hotel; Grade 2 School; Special grade)", "Judgment", and "Margin (dB)" are displayed. Each item is displayed as necessary.
[0092] The report also displays various numerical values and graphs, as shown in Figure 14. The various numerical values show some of the values shown in Figure 13. The vertical axis of the graph shows the heavy floor impact sound level (dB), and the horizontal axis of the graph shows the octave band center frequency (Hz). The graph displays the light floor impact sound level for each frequency generated in the sound receiving room. The points indicated by circles (○) in the figure are the calculation results (prediction results) of the light floor impact sound level. The thick black line on the graph indicates the design target value (LL-50 in the example shown). By looking at the graph, it is possible to compare the prediction results with the design target value.
[0093] The calculation report can be output in a spreadsheet file format such as CSV or displayed on the display 102b. The calculation report can be created for any area (room) or any combination of areas, but can also be created for each combination of a sound source room and a sound receiving room, for example.
[0094] As described above, this embodiment has the following advantages. (1) According to this embodiment, the user can check the floor impact sound level of the sound receiving room simply by specifying the sound source room and the sound receiving room, so that even non-specialized engineers can easily verify. In other words, the user can simply specify the sound source room and the sound receiving room using a two-dimensional plan view or cross section, and the program can automatically obtain the information necessary for calculation, so that even non-specialized engineers can easily verify.
[0095] (2) According to this embodiment, a simplified model that shows the BIM model building is generated and the floor impact sound level of the sound receiving room is calculated using this simplified model, which makes it possible to speed up the calculation processing speed compared to a method that uses the BIM model as is. In other words, the calculation processing speed is fast because the simplified model is automatically generated from the BIM model.
[0096] (3) According to this embodiment, a simplified model is generated by distinguishing between main beams and sub-beams in the BIM model, so that floor impact sound levels can be accurately predicted.
[0097] (4) According to this embodiment, excitation point information regarding excitation points of a sound source room is generated, which makes it easier for a user to set excitation points compared to when the user sets excitation point information from scratch.
[0098] (5) According to this embodiment, multiple points (five points) are set as excitation points, so that it is possible to predict the floor impact sound level taking into consideration the influence of multiple excitation points. Note that the number of excitation points is not limited to five, and may be two to four, or six or more.
[0099] (6) According to this embodiment, it is possible to generate multiple patterns of excitation points that can be selected by user operation. This makes it possible to present excitation points that are suitable for complex room shapes or excitation points that the user is not aware of, thereby expanding the range of excitation point choices.
[0100] (7) According to this embodiment, the distance from the slab end (reference point S0), which has the greatest constraint effect, to the excitation point is output as excitation point information, so the user does not need to calculate the distance himself, thereby reducing the burden on the user.
[0101] (8) According to this embodiment, the calculation results (floor impact sound levels) are displayed in different colors, which makes it easier to compare the verification results and the specification change results. That is, the analysis results can be displayed in different colors on two-dimensional plan views, cross-sectional views, etc., and spatial differences in floor impact sounds can be visually recognized, making it easier to compare the verification results and the specification change results.
[0102] (9) According to this embodiment, at least a part of the various numerical values used in the calculation by the calculation processing unit 128 is output as a calculation report (table or graph). Therefore, by outputting the various numerical values, it is possible to verify in detail which numerical values have problems.
[0103] (10) According to this embodiment, the calculation results are output on a plan view, cross-sectional view, or three-dimensional view of the building, so that it is possible to easily confirm how floor impact sound levels vary spatially within the building.
[0104] (11) According to this embodiment, the above-described floor impact sound level prediction system can be realized by a floor impact sound level prediction program.
[0105] 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.
[0106] In one embodiment, a simplified model is generated by distinguishing between girders and sub-girders in the BIM model. However, a simplified model may be generated without distinguishing between girders and sub-girders in the BIM model. Furthermore, excitation point information regarding excitation points or the distance from a specific corner to the excitation point may not be generated. Furthermore, if the floor impact sound level exceeds a predetermined target value, the required reduction amount may be calculated, and based on the calculation results, a floor finishing material may be selected or a display may be displayed encouraging reinforcement of the floor structure.
[0107] Furthermore, the system configuration example (FIG. 1), procedure example (FIG. 2), and display examples (FIGS. 11 to 14) are merely preferred examples, and the present invention can be implemented by appropriately modifying these.
[0108] Furthermore, the formula for calculating floor impact sound levels and the information required for the calculation are merely examples. Floor impact sound levels may be calculated using a different formula, and the information required for the calculation may be increased or decreased as needed. Furthermore, if the information required for the calculation cannot be obtained from the BIM model, the user may be prompted to input the missing information, or the calculation may be performed using pre-set initial values.
[0109] The designation information receiving means may receive information designating a sound receiving room that receives the floor impact sound generated in the sound source room, in addition to information designating the sound source room that is the source of the floor impact sound. Also, if a sound source room is designated and the sound receiving room directly below it is automatically designated, the designation information receiving means does not need to accept information designating a sound receiving room. [Explanation of symbols]
[0110] 100 Floor impact sound level prediction system 110 control section 112 Input processing section 114 Output Processing Unit 116 Image Processing Unit 120 Simple model generation processing unit 122 Designated Information Reception Processing Unit 124 Sound source room information acquisition processing unit 126 Sound receiving room information acquisition processing unit 128 Calculation Processing Unit 130 Judgment processing unit 150 Storage medium 160 databases 170 BIM tool execution processing unit
Claims
1. A floor impact sound level prediction system that predicts the floor impact sound level of a building using a BIM model that represents the structure and specifications of a building to be analyzed as three-dimensional data, A simplified model generation means for generating a simplified model of the building of the BIM model based on information about beams and slabs of the BIM model; A designation information receiving means for receiving designation information for designating at least a sound source room that is a source of floor impact noise from the BIM model; a sound source room information acquisition means for acquiring sound source room information relating to the sound source room from the BIM model; a sound receiving room information acquisition means for acquiring, from the BIM model, sound receiving room information relating to a sound receiving room that receives floor impact sounds generated in the sound source room; a calculation means for calculating a floor impact sound level of the sound receiving room based on the simple model, the designation information, the sound source room information, and the sound receiving room information; an output means for outputting the calculation result of the calculation means; A floor impact sound level prediction system.
2. 2. The floor impact sound level prediction system according to claim 1, The floor impact sound level prediction system is characterized in that the simplified model generation means distinguishes between main beams and minor beams of the BIM model and generates the simplified model.
3. 2. The floor impact sound level prediction system according to claim 1, A floor impact sound level prediction system characterized in that the sound source room information acquisition means generates excitation point information regarding excitation points of the sound source room based on the BIM model.
4. 4. The floor impact sound level prediction system according to claim 3, The sound source room information acquisition means sets a plurality of points as the excitation points, which are more than a predetermined distance away from the surrounding walls of the room and are evenly distributed, including a central point near the center of the room. This is a floor impact sound level prediction system.
5. 4. The floor impact sound level prediction system according to claim 3, A floor impact sound level prediction system, characterized in that the sound source room information acquisition means is capable of generating a plurality of patterns as the excitation points that can be selected by a user's operation.
6. 4. The floor impact sound level prediction system according to claim 3, A floor impact sound level prediction system characterized in that the sound source room information acquisition means outputs, as the excitation point information, the distance from a specific corner of a slab that includes the excitation point to the excitation point.
7. 2. The floor impact sound level prediction system according to claim 1, A floor impact sound level prediction system characterized in that, when the output means displays the calculation results for multiple sound receiving rooms, the calculation results are displayed in different colors depending on the value of the calculation results.
8. 2. The floor impact sound level prediction system according to claim 1, The floor impact sound level prediction system is characterized in that the output means outputs at least a part of the various numerical values used in the calculation by the calculation means.
9. 2. The floor impact sound level prediction system according to claim 1, The floor impact sound level prediction system is characterized in that the output means outputs the calculation result of the calculation means on a plan view, a cross-sectional view, or a three-dimensional view of the building.