JPH1068655A - Predicting method and predicting system of solid-borne sound - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a predicting method and predicting system of solid-borne sound capable of performing accurate prediction according to the structure, etc., of an object to be predicted. SOLUTION: By a statistical energy analyzing method through the use of a computer 10, each constituting element of a building is modeled into a member element and space element. In the case that sound, vibrations, etc., are provided for a certain element, sound and vibrations, etc., propagating through each element are treated as energy, an energy equilibrium equation in a model is solved to obtain the data of a sound pressure level and vibration level in each frequency of the certain element. Then the data is sent to an equalizer 14 and synthesized with fictitiously provided sound and vibrations obtained from a simulated vibration source 16 of vibrations. By this, the results are sent to a speaker 20, etc., via amplifier 18 to be actually regenerated for listening and experiencing.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a prediction method and a prediction system for predicting vibration and sound propagation of a building or the like.

[0002]

2. Description of the Related Art Conventionally, when sound transmitted from a virtual sound source to a certain room is determined, for example, in order to determine the livability of a building, it is determined by an arithmetic expression taking into account only the distance attenuation of the propagated sound. Had become. For example, assuming that the livability of the rooms indicated by a to o in the figure is determined for a five-story building as shown in FIG. 4, each of the sound sources 100 provided in the room a on the first floor is The sound propagating to the living rooms bo is obtained based on the distance between the living room a and each of the living rooms bo.

[0003] Therefore, for example, a room b which is immediately above the room a and a room f which is immediately adjacent to the room a are regarded as having the same distance from the room a and are treated as equivalent propagation sounds. Similarly,
The room c on the second floor and the room k on the second floor are treated as equivalent propagation sounds, and the room g on the diagonal is also the room c,
Treated as propagation sound equivalent to k. Then, based on such a distance relationship between the living room a and each of the living rooms bo, for example, FIG.
As shown in (1), the propagation sound of each of the rooms bo is calculated using an operation table indicating the attenuation of the propagation sound corresponding to the distance to the room a.

That is, in the calculation table shown in FIG. 5, the horizontal axis represents the distance from the living room a (the sound source 100), and the vertical axis represents the relative level to the sound source 100 based on the attenuation of the propagated sound. The illustrated example shows a case where attenuation is performed by 10 dB each time one room is separated from the room a. Therefore, for example, it is determined that the propagation sound in the room e on the fifth floor is attenuated by 40 dB from the level of the sound source 100.

[0005]

However, in the above-mentioned prior art, since the propagation sound of each room is predicted only by considering the distance attenuation, the structural characteristics and the like of the building are not considered at all. However, there is a drawback that accurate evaluation cannot be performed. Therefore, an object of the present invention is to provide a solid-state propagation signal prediction method and a prediction system capable of performing accurate prediction corresponding to the structure of a prediction target.

[0006]

According to the present invention, there is provided a method for estimating a solid-borne sound according to the present invention, in which each component of an object to be predicted is modeled based on its physical properties and form. The present invention is characterized in that a propagation state of sound or vibration transmitted to a component is calculated, and a vibration propagation state propagating from a certain vibration source to an arbitrary measurement position is predicted based on the calculation result. Further, in the prediction method of the present invention, the component includes a member element and a space element, and the sound propagation state of the member element is determined based on its physical property condition, shape condition, and dimensional condition. , And for the spatial element, a sound propagation state in the spatial element is calculated based on the dimensional condition.

Further, the prediction method of the present invention is characterized in that the calculation condition of the vibration / sound propagation condition in each element includes a frequency characteristic condition of each element. Further, in the prediction method of the present invention, the prediction object is a building, the member element includes a floor, a wall, a ceiling, a pillar, and a beam that configure the building, and the space element includes a room that configures the building. It is characterized by including.

In addition, the system for predicting a solid-borne sound according to the present invention models propagation of sound or vibration transmitted to each component by modeling each component of the object to be predicted based on its physical properties and form. It is characterized by having a first processing device for calculating a situation and a second processing device for predicting a vibration propagating from a certain vibration source to an arbitrary measurement position based on the calculation result. Further, the prediction system of the present invention is characterized in that the second processing device has a reproducing unit that virtually reproduces a propagation vibration at an arbitrary measurement position based on a calculation result of the first processing device. And

[0009] Further, the prediction system according to the present invention is characterized in that the first
Is a computer, and the second processing device includes an equalizer. Further, in the prediction system of the present invention, the constituent element includes a member element and a space element, and the propagation state of the vibration in the member element is determined based on the physical property condition, the shape condition, and the dimensional condition. , And for the spatial element, a sound propagation state in the spatial element is calculated based on the dimensional condition.

Further, the prediction system of the present invention is characterized in that the calculation condition of the vibration / sound propagation state in each element includes a frequency characteristic condition of each element. Further, in the prediction system of the present invention, the prediction target is a building, the member element includes a floor, a wall, a ceiling, a pillar, and a beam that configure the building, and the space element includes a room that configures the building. It is characterized by including.

In the method for predicting a solid-borne sound according to the present invention, vibration and sound propagating to each component of a prediction target are
It is calculated according to the physical properties and form, and based on the calculation result, the vibration propagation state at an arbitrary measurement position is predicted from a certain vibration source. It is possible to predict a vibration propagation state closer to the actual one. In the prediction system for solid-borne sound according to the present invention, the first processing device calculates vibration / sound propagating to each component of the prediction target object in accordance with its physical property and form. Based on the result, the second processing device predicts the vibration propagation state at an arbitrary measurement position from a certain vibration source, so that the vibration propagation state closer to the actual body is compared with the conventional prediction considering only the distance attenuation. Predict the situation.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, an embodiment of a method and system for predicting solid-borne sound according to the present invention will be described. FIG. 1 is a block diagram showing an outline of a system for predicting a solid-borne sound according to the present invention. In this example, first, each element constituting a building to be a prediction target is analyzed by a statistical energy analysis method (hereinafter referred to as SEA (Statistical Energy Analysys)).
Process).

[0013] In this SEA, each element constituting a building is modeled as a member element or a space element, and when sound or vibration is applied to a certain element, sound or vibration transmitted between the elements is treated as energy. By solving the energy balance equation in the model, the propagation state of sound and vibration to a certain element is obtained. Here, a floor, a wall, a ceiling, a pillar, a beam, and the like that constitute a building are each one member element, and a room and the like that constitute a building are each one space element.

In the SEA, for each of the above-mentioned member elements, the propagation state of vibration and sound in the member element is calculated based on the physical property condition, shape condition, and dimensional condition. Here, the physical property conditions mainly include the material of the member element, for example, steel structure, concrete structure, acrylic resin structure and the like. Further, the shape conditions include conditions such as a planar shape and a cross-sectional shape of the member, for example, a square, a rectangle, and a span ratio. Further, the dimensional conditions include the size and distance of the member and the space.

In the configuration shown in FIG. 1, the above-described various condition data is input by the input device 12 to the computer 10 (corresponding to the first processing device) having the above-described SEA processing function. By doing so, the arithmetic processing of SEA is performed. That is, the computer 10 performs the following processing. For example, considering the materials and dimensions of a floor, a wall, and a ceiling as a member element of a certain room, energy transmitted from a certain sound source or vibration source to each element is obtained.

The energy transmitted through each member element is
For a given spatial position in the room, model how it is transmitted from the floor, wall, and ceiling, taking into account the dimensions of the spatial elements, and determine how it will act on people located in this space . In addition, when sound and vibration are transmitted through a plurality of rooms, the sound is finally transmitted to a desired room in consideration of the energy attenuation when propagating the above-described floor, wall, and ceiling member elements and space elements. Find the propagating energy. As described above, sound and vibration at an arbitrary space position (room) are obtained from a sound source or a vibration source having a building.

Next, a specific example of the simple arithmetic processing of SEA as described above will be described with reference to FIG. Assuming a simple model of a wall and a space as shown in FIG. 2, the energy of a certain vibration source is E1. The energy attenuation when transmitting three member elements A, B, and C having different physical properties and dimensions of the members is defined as TA, TB, and TC, and the amounts of energy reflected between the members are defined as RA, RB, and RC. I do. In addition, when the spatial elements D, E, and F are transmitted, the energy attenuation amounts are TD and T.
E, TF, and the energy transmitted from the space element to the member element is RD, RE, RF.

Here, the vibration energy E transmitted to any member
2, E2 = E1- (TA + TB + TC + TD + TE + TF)
+ (RA + RB + RC + RD + RE + RF). Then, such an operation is performed for all member elements and space elements.

SEA by such a computer 10
Is output as data representing a sound pressure level or a vibration level at each frequency of a certain member or space. Therefore, these data are sent to the equalizer 14 (corresponding to the second processing unit), and the vibration obtained from the virtually provided sound or vibration pseudo-vibration source 16 is corrected by the characteristics obtained by the SEA calculation result. By doing so, sounds and vibrations actually obtained can be reproduced.

FIG. 3 is an explanatory diagram showing a specific example of the processing by the equalizer 14. First, FIG. 3A shows the result data of the SEA calculation by the computer 10.
As illustrated, the SEA calculation result data is input to the equalizer 14 in the form of a sound pressure level for each specific frequency.

Next, FIG. 3B shows a pseudo vibration input from the pseudo vibration source 16. As shown, this example shows a case of a sound having a substantially flat frequency characteristic. Note that a tape recorder, a microphone, or the like can be used as the simulated vibration source 16, and it is possible to input actual noise or noise such as a train running sound or an engine sound. Next, FIG. 3C shows the processing output of the equalizer 14. As shown, the equalizer 14 combines and outputs the vibration from the pseudo vibration source 16 and the envelope vibration of the SEA calculation result data.

The output of the equalizer 14 is output from the speaker 20 via the amplifier 18 and reproduced and listened to as actual sound.
As described above, in the prediction system of the present example, the degree of discomfort can be judged by the actual ear by actually hearing the predicted sound of the propagation sound that differs according to the structure and form of the building. It is possible to provide a simulation system capable of effectively taking measures for preventing sound. For example,
If the sense of hearing of a room in a target building is better in the case of using concrete elements than in the case of using steel frame data for member elements, the building is more advantageous in concrete.

The calculation result of the computer 10 can be output to the display device 22 or the like as numerical data representing a physical quantity in addition to performing the actual pseudo reproduction output as described above. In this case, for example, the absolute value of the sound pressure is set to 70 dB (A) or 80 dB.
(A) It can be grasped in the same format as the conventional one. In the computer 10, as in the conventional case,
If the propagating sound can be predicted based on the distance attenuation and the prediction can be performed by various methods, a more effective prediction system can be configured.

When the propagation sound is predicted as described above, it can be reproduced by the amplifier 18 and the speaker 20.
When predicting the propagation vibration, for example, a vibration device can be provided on the floor of the model room so that the actual vibration can be felt. In the above description, specific examples are shown in a simplified form in order to facilitate understanding of the present invention. In actual processing, the processing capability of a computer is fully utilized, and further detailed processing is performed. Calculation processing is performed by modeling with setting conditions, and more precise prediction is possible.

That is, the present invention calculates the propagation vibration corresponding to the physical property and form of each component in order to predict the propagation vibration according to the difference in the structure and form of the object to be predicted. Depending on the scale of the prediction system and the need for prediction accuracy, etc.
Simple to complex ones can be adopted as appropriate, and it goes without saying that the specific calculation contents can be appropriately modified.

[0026]

As described above, in the method and system for predicting a solid-borne sound according to the present invention, the vibration and sound transmitted to each component of the predicted object are calculated in accordance with the physical properties and form. Based on the calculation result, a vibration propagation state at an arbitrary measurement position from a certain vibration source is predicted. For this reason, it is possible to predict a vibration propagation state closer to the real body in accordance with the difference in the structure or form of the prediction target, as compared with the prediction that only considers the distance attenuation as in the related art.

[Brief description of the drawings]

FIG. 1 is a block diagram showing an outline of a system for predicting a solid-borne sound according to the present invention.

FIG. 2 is an explanatory diagram showing a specific example of a model processed by SEA in the prediction system of FIG. 1;

FIG. 3 is an explanatory diagram showing a specific example of processing by an equalizer in the prediction system of FIG. 1;

FIG. 4 is an explanatory diagram showing a configuration example of a building that is a target object for solid-borne sound prediction;

FIG. 5 is an explanatory diagram showing an outline of a conventional prediction method.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Computer 12 Input device 14 Equalizer 16 Simulated vibration source 18 Amplifier 20 Speaker 22 Display device

Claims (10)

[Claims] 1. Modeling each component of a prediction object based on its physical properties and form to calculate the propagation state of sound or vibration transmitted to each component, and based on the calculation result A method for estimating the state of vibration transmitted from a certain vibration source to an arbitrary measurement position. 2. The component includes a member element and a space element, and for the member element, calculates a propagation state of vibration in the member element based on physical property conditions, shape conditions, and dimensional conditions. 2. The method according to claim 1, wherein a sound propagation state of the space element is calculated based on a dimensional condition of the space element. 3. The method for predicting a solid-borne sound according to claim 1, wherein the calculation condition of the vibration / sound propagation state of each element includes a frequency characteristic condition of each element. 4. The object to be predicted is a building, the member elements include floors, walls, ceilings, columns, and beams that form the building, and the space elements include rooms that form the building. 4. The method for predicting a solid-borne sound according to 2 or 3. 5. A first processing device for calculating a propagation state of sound or vibration transmitted to each component by modeling each component of the prediction target based on its physical properties and form, and A second processing device for predicting a vibration propagating from a certain vibration source to an arbitrary measurement position based on a calculation result. 6. The solid-state propagation device according to claim 5, wherein the second processing device has a reproducing unit that virtually reproduces a propagation vibration at an arbitrary measurement position based on a calculation result of the first processing device. Sound prediction system. 7. The system according to claim 5, wherein the first processing device is a computer, and the second processing device includes an equalizer. 8. The component element includes a member element and a space element, and for the member element, a vibration propagation state in the member element is calculated based on physical property conditions, shape conditions, and dimensional conditions, The system for predicting a solid-borne sound according to any one of claims 5 to 7, wherein the sound element calculates a sound propagation state in the space element based on the dimensional condition. 9. The solid-state propagated sound prediction system according to claim 5, wherein the calculation condition of the vibration / sound propagation state in each element includes a frequency characteristic condition of each element. 10. The prediction object is a building, the member element includes a floor, a wall, a ceiling, a column, and a beam that form the building, and the space element includes a room that forms the building. 10. The system for predicting a solid-borne sound according to 8 or 9.