JPH08159929A - Method and apparatus for measurement of sound-insulation performance of floor - Google Patents

Abstract

PURPOSE: To estimate the sound-insulation performance of a floor constructed of a floor panel by a method wherein the sound-insulation performance of the floor constructed between a sound-source chamber on the upper story in a building and a sound-receiving chamber on the lower story can be evaluated purely and precisely and the sound-insulation performance of only the floor panel as a single body is measured. CONSTITUTION: In order to measure the sound-insulation performance of a floor 4 constructed between a sound-source chamber 2 and a sound-receiving chamber 3 in a building 1, microphones 13 are set so as to be separated from the floor 4, vibration sensors 15 are attached to the floor 4, and shock sounds are generated in the floor 4 by floor-shock-sound generators 11, 12. Floor shock sounds which have been detected by the microphones 13 are octave-analyzed, floor vibrations which have been detected by the vibration sensors 15 are octave-analyzed, the sound-insulation performance of the floor is evaluated on the basis of the octave analysis of the floor shock sounds, the component of noises from a beam 6, a circumferential wall 7 and the like, which have been mixed with the floor shock sounds, is analyzed on the basis of both octave analyses, and the evaluation of the sound-insulation performance of the floor is corrected.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for measuring floor sound insulation performance of a building and a measuring device used in the method.

[0002]

2. Description of the Related Art Generally, floor sound insulation performance of a building is measured by a method specified in JIS. That is, JIS
In A1418, as a "method of measuring floor impact sound level at the building site", a floor was constructed between the sound source room on the upper floor of the building and the sound receiving room on the lower floor, and separated from the floor in the sound receiving room. A set of multiple microphones is installed, a floor impact sound generator installed in the sound source room generates an impact sound on the floor, and the floor impact sound detected by the microphone is analyzed by octave. In addition, JIS A1419 defines a method for evaluating floor sound insulation performance based on the octave analysis of the sound, as "the sound insulation grade of a building".

[0003]

However, the above-mentioned JIS
In the measuring method of A1418, when an impact sound is generated on the floor by the floor impact sound generator, each part of the building (beam,
Since the impact sound is also transmitted to columns, walls, etc., not only the floor impact sound, but also noise components from the beams, columns, walls, etc. may be mixed into the microphone, and the noise may not be ignored. In such a case, a pure floor impact sound level cannot be obtained accurately even if octave analysis is performed on the floor impact sound mixed with noise components, and a pure floor sound insulation performance is determined accurately even when evaluated according to JIS A1419. It wasn't what I evaluated. In other words, even if the pure floor sound insulation performance is sufficiently high, if the noise components from the beams, columns, walls, etc. are large, the floor sound insulation performance will be underestimated, and the floor will be useless and excessively improved. Will be required. In such a case, it is better to suppress the vibration of beams, columns, walls, etc.

In addition, the above-mentioned measurement method of JIS A1418 can be performed only after a floor is constructed between the sound source room on the upper floor of the building and the sound receiving room on the lower floor of the building, so a new floor panel is developed. In this case, every time a floor panel was prototyped during development, it was necessary to construct a floor and then perform measurements for the test, which required considerable time, labor, and cost for development.

Therefore, a first object of the present invention is to enable pure and accurate evaluation of the sound insulation performance of a floor constructed between a sound source room on the upper floor of a building and a sound receiving room on the lower floor. It is in. A second object of the present invention is to make it possible to estimate the sound insulation performance of the floor constructed by the floor panel by simply measuring the floor panel alone, and the labor, time and cost required for the development of the floor panel. To reduce.

[0006]

In order to achieve the above object, the invention of claim 1 is the sound insulation performance of a floor constructed between a sound source room on the upper floor of a building and a sound receiving room on the lower floor of a building. In the method of measuring, while the microphone is set apart from the floor in the sound receiving room, a vibration sensor is attached to the floor, and an impact sound is generated on the floor by the floor impact sound generator installed in the sound source room,
The floor impact sound detected by the microphone is analyzed by octave, the floor vibration detected by the vibration sensor is analyzed by octave, and the floor sound insulation performance is evaluated based on the octave analysis of the floor impact sound. Based on a comparison with an octave analysis of vibration, the noise component from each part of the building other than the floor mixed in the floor impact sound is analyzed, and the evaluation of the floor sound insulation performance is corrected.

According to a second aspect of the present invention, there is provided a floor impact sound generation method, wherein a floor panel used for building a floor is supported by a support member, and a vibration sensor is attached to the floor panel. It is characterized by generating an impact sound on the floor panel by the octave analysis of the floor panel vibration detected by the vibration sensor, and estimating the floor sound insulation performance constructed by the floor panel based on the octave analysis of the floor panel vibration.

According to a third aspect of the present invention, there is provided a floor sound insulation performance measuring apparatus comprising: a floor impact sound generator for producing an impact sound on the floor; a microphone set apart from the floor; and a vibration sensor attached to the floor. And a digital data recorder which converts the analog data of the floor impact sound detected by the microphone and the analog data of the floor vibration detected by the vibration sensor into digital data of the floor impact sound and digital data of the floor vibration, respectively, and records the data. An octave analyzer for converting floor impact sound digital data and floor vibration digital data recorded in the digital data recorder into floor impact sound octave data and floor vibration octave data, respectively,
The digital data recorder and the octave analyzer are respectively provided with control commands, and a microcomputer for comparing the octave data of the floor impact sound converted by the octave analyzer with the octave data of the floor vibration is provided.

Here, examples of the vibration sensor include an electrodynamic pickup, a piezoelectric pickup, a servo pickup, and the like. Examples of the octave analyzer include a fast Fourier transform analyzer, a real-time bandpass frequency analyzer, and the like.

[0010]

According to the floor sound insulation performance measuring method of the first aspect of the invention or the floor sound insulation performance measuring apparatus of the third aspect of the invention, when an impact sound is generated on the floor by the floor impact sound generator, Not only the floor sound insulation performance is evaluated based on the octave analysis of the floor impact sound detected by the microphone, but the floor vibration is detected by the vibration sensor attached to the floor, and the octave analysis of the floor vibration and the octave analysis of the floor impact sound are performed. Based on the comparison with the above, the noise component from each part of the building other than the floor mixed in the floor impact sound is analyzed, and the evaluation of the floor sound insulation performance is corrected, so that the pure floor sound insulation performance can be accurately evaluated. Become.

According to another method for measuring floor sound insulation performance according to the invention of claim 2, the sound insulation performance of the floor constructed by the floor panel can be estimated only by measuring the floor panel alone. Become.

[0012]

Examples FIGS. 1 to 5 show a first embodiment for measuring the sound insulation performance of a floor 4 constructed between a sound source room 2 on the upper floor of a building 1 and a sound receiving room 3 on the lower floor. 3 shows an example measuring device and measuring method. The floor 4 measured in this embodiment is constructed by mounting a plurality of floor panels 5 (for example, lightweight cellular concrete floor panels) on a beam 6. In addition, 7 indicates a peripheral wall, and 8 indicates a floor of the sound receiving chamber 3.

FIG. 1 shows a measuring device 10, which is composed of the following elements. On the upper surface of the floor 4, there are two types of floor impact sound generators that generate an impact sound on the floor 4, namely, JIS A14.
A heavy floor impact sound generator 11 and a lightweight floor impact sound generator 12 defined in 18 are installed. The heavy floor impact sound generator 11 includes one heavy impact source (equivalent mass 7.3 ± 0.4 k).
It hits the floor 4 with g) and is called a bang machine. The lightweight floor impact sound generator 12 hits the floor 4 with five hammers (effective mass 500 ± 12.5 g) at time intervals of 100 ± 5 ms, and is called a tapping machine.

Five microphones 13 are provided at the five uniformly distributed measuring points in the sound receiving chamber 3 from the peripheral walls 7 to 5, respectively.
Separated by 0 cm or more from the floor 8 of the sound receiving room 3 to 1.2 to 1.5
m apart from the floor 4 between the upper and lower chambers by the remaining height (1.0 ~
About 1.8 m) apart and set upward.
Each microphone 13 is connected to an amplifier 14.

Five piezoelectric acceleration pickups as vibration sensors 15 are attached to five uniformly distributed measurement points on the lower surface of the floor 4. Each vibration sensor 15
It is connected to a charge amplifier 16 that outputs a voltage proportional to the charge generated by the piezoelectric acceleration pickup.

At the outputs of the amplifier 14 and the charge amplifier 16, analog data of the floor impact sound detected by the microphone 13 and analog data of the floor vibration detected by the vibration sensor 15 are digital data of the floor impact sound and the floor vibration, respectively. A multi-channel DAT (digital audio tape recorder) is connected as a digital data recorder 17 for converting into digital data and recording. The conversion conditions are: sampling frequency 48 kHz / bit number 16 bits, sampling frequency 44.1 kHz / bit number 1
There are three types of 6 bits or a sampling frequency of 32 kHz / bit number of 12 bits, which can be appropriately switched.

At the output of the digital data recorder 17, the floor impact sound digital data and the floor vibration digital data recorded in the digital data recorder 17 are converted into floor impact sound octave data and floor vibration octave data, respectively. A fast Fourier transform analyzer as an octave analyzer 18 for conversion is connected.

The control terminals of the digital data recorder 17 and the octave analyzer 18 are connected to the digital data recorder 17
And the octave analyzer 18 are respectively provided with a microcomputer 19 for giving a control command.
32C and GP-IB (well-known input / output interface standard). A commercially available personal computer is used as the microcomputer 19. In addition, the microcomputer 19 compares the octave data of the floor impact sound converted by the octave analyzer 18 with the octave data of the floor vibration, and based on the comparison, builds other than the floor 4 mixed in the floor impact sound. It operates according to a program so as to analyze the noise component from each part of the object (beam 6, peripheral wall 7, etc.) and correct the evaluation of the floor sound insulation performance.

Reference numeral 20 is a monitor display connected to the monitor output of the microcomputer 19, 21 is a printer also connected to a print output, and 22 is an RS-23.
It is a plotter connected by 2C.

Now, the floor sound insulation performance measuring method of this embodiment is carried out by using the above-mentioned measuring apparatus 10 in the procedure as shown in FIG. First, the floor 4 is hit by the heavy floor impact sound generator 11 installed in the sound source room 2 to generate an impact sound on the floor 4.

At this time of impact, the impact sound of the floor 4 detected by the microphone 13 is amplified by the amplifier 14 into analog data of a predetermined level, and the digital data recorder 17 is provided.
It is converted into digital data by and recorded. The method of averaging the measurement points (5 points) follows JIS A1418 (the same applies hereinafter). As described above, the microphone 1
Not only a pure floor impact sound but also noise components from the beam 6, the peripheral wall 7 and the like are mixed in 3.

The digital data of the floor impact sound is converted by the octave analyzer 18 into center frequencies of 63 Hz and 125.
Hz, 250 Hz, 500 Hz, 1000 Hz, 200
Fast Fourier transform is performed on the octave data in each one octave band of 0 Hz and 4000 Hz, and the octave analysis is performed. That is, a spectrum curve of floor impact sound level / octave band center frequency is created and displayed on the display unit 18 a included in the octave analyzer 18.

The microcomputer 19 receives the digital data of the floor impact sound from the octave analyzer 18, and the spectrum curve thereof has a standard curve of 6 steps from the sound insulation grade L-65 to L-40 specified in JIS A1419. Is overwritten and displayed on the monitor display 20, and is printed out by the printer 21 or the plotter 22. FIG. 3 shows an example of this spectrum curve. When the spectrum curve is below a certain reference curve in all frequency bands, the sound insulation class is represented by the name of the smallest reference curve, and thus the floor sound insulation performance is evaluated. That is, in the example of FIG. 3, the floor sound insulation performance is evaluated as sound insulation grade L-55. However, since this evaluation includes mixing of noise components from the beam 6, the peripheral wall 7, etc. as described above, it is not an accurate evaluation of pure floor sound insulation performance.

On the other hand, the vibration of the floor 4 detected by the vibration sensor 15 at the time of the impact is amplified by the charge amplifier 16 into analog data of a predetermined level, and further converted into digital data by the digital data recorder 17 and recorded. It It should be noted that the vibration sensor 15 detects only pure floor vibration, and mixing of noise components from the beam 6, the peripheral wall 7, etc. can be ignored.

The digital data of the floor vibration is also measured by the octave analyzer 18, for example, the center frequency of 31.5H.
z, 63Hz, 125Hz, 250Hz and 500Hz
Is subjected to fast Fourier transform into octave data in each 1-octave band and is subjected to octave analysis. That is, a spectrum curve of floor vibration velocity level / octave band center frequency is created and displayed on the display unit 18 a included in the octave analyzer 18.

The microcomputer 19 receives the floor vibration digital data from the octave analyzer 18, displays the spectrum curve on the monitor display 20, and prints it out by the printer 21 or the plotter 22. FIG. 4 shows an example of this spectrum curve. The floor vibration velocity level in the figure is a logarithm based on 10 ^-8 m / s. It can be said that this spectrum curve shows the characteristics of pure floor vibration.

Then, the microcomputer 19 compares the octave analysis of the floor vibration with the octave analysis of the floor impact sound, and based on the comparison, the beam 6 and the peripheral wall 7 mixed in the floor impact sound are analyzed. Of the noise component is analyzed to correct the floor sound insulation performance evaluation. FIG. 5 shows a spectrum curve of a floor impact sound considered to be pure, which is corrected based on a comparison between the spectrum curve of the floor impact sound of FIG. 3 and the spectrum curve of the floor vibration of FIG. In this example, the evaluation of the floor sound insulation performance is corrected to the sound insulation grade L-50. It should be noted that, for this comparison processing, the microcomputer 19 was obtained based on a large number of sample tests,
Data for comparison processing (for conversion) indicating the relationship between the floor impact sound spectrum curve, the floor vibration spectrum curve, and the corrected floor impact sound spectrum curve is stored.

Subsequently, the floor 4 is struck by the lightweight floor impact sound generator 12 to generate an impact sound on the floor 4, and the measurement may be performed in the same manner as above.

Next, FIGS. 6 to 9 show the measurement apparatus of the second embodiment for estimating the sound insulation performance of the floor constructed by the floor panel 5 by measuring the floor panel 5 alone. A part and measurement method are shown.

In this embodiment, as shown in FIG. 6, a single floor panel 5 is supported on a supporting frame 23, and five measurement points are uniformly distributed on the lower surface of the floor panel 5. The vibration sensor 15 is attached. A microphone may or may not be used. Others are the same as the measuring device 10 of the first embodiment.
1 is used, most of FIG. 1 is incorporated.

The method for measuring the floor sound insulation performance of this embodiment is shown in FIG.
The procedure is as shown in. First, the floor panel 5 is struck by a heavy floor impact sound generator (not shown),
Generate an impact sound.

At the time of this impact, the vibration of the floor panel 5 detected by the vibration sensor 15 is amplified by the charge amplifier 16 into analog data of a predetermined level, and further converted into digital data by the digital data recorder 17 and recorded. .

The digital data of the floor panel vibration is converted by the octave analyzer 18 into a center frequency of 31.
5Hz, 63Hz, 125Hz, 250Hz and 500
Fast Fourier transform is performed on the octave data in each 1 octave band of Hz, and the octave analysis is performed. That is, a spectrum curve of floor panel vibration velocity level / octave band center frequency is created, and the octave analyzer 1
8 is displayed on the display unit 18a included in the display unit 18.

The microcomputer 19 receives the floor panel vibration digital data from the octave analyzer 18, displays the spectrum curve thereof on the monitor display 20, and prints it out by the printer 21 or the plotter 22. FIG. 8 shows an example of this spectrum curve.

Then, the microcomputer 19 estimates the sound insulation performance of the floor constructed by the floor panel 5 based on the octave analysis of the floor panel vibration. FIG. 9 corresponds to FIG.
The spectrum curve of the floor impact sound estimated based on the spectrum curve of the floor panel vibration of is shown. In this example, the floor sound insulation performance was estimated to be sound insulation class L-65, and further development and improvement of the floor panel 5 can be promoted based on the estimation result. For this estimation, the microcomputer 19 uses the floor panel vibration spectrum curve obtained based on a large number of sample tests and the floor impact measured, evaluated and corrected as in the first embodiment. Data for estimation (for conversion) indicating the relationship between the sound spectrum curve and the sound spectrum curve is stored.

Subsequently, the floor panel 5 may be hit with a lightweight floor impact sound generator (not shown) to generate an impact sound on the floor panel 5, and the measurement may be performed in the same manner as above.

The present invention is not limited to the configuration of the above-described embodiment, but may be embodied with appropriate modifications within the scope not departing from the spirit of the invention, for example, as follows. (1) The floor panel may be made of any material. (2) Each step of the measuring method and each element of the measuring device are
It is not absolutely bound by the provisions of JIS A1418 and A1419, and steps and elements outside the same standard can be adopted to develop a more preferable measurement method.

[0038]

As described in detail above, according to the floor sound insulation performance measuring method of the first aspect of the invention or the floor sound insulation performance measuring apparatus of the third aspect, the sound source of the upper floor of the building is The sound insulation performance of the floor constructed between the room and the sound receiving room on the lower floor can be evaluated purely and accurately.

According to the floor sound insulation performance measuring method of the second aspect of the present invention, the sound insulation performance of the floor constructed by the floor panel can be estimated only by measuring the floor panel alone. The labor, time and cost required for development can be reduced.

[Brief description of drawings]

FIG. 1 is a block diagram of a floor sound insulation performance measuring apparatus according to a first embodiment of the present invention.

FIG. 2 is a flowchart showing a method for measuring floor sound insulation performance of the same embodiment.

FIG. 3 is a graph showing an example of a floor impact sound spectrum curve measured by the same method.

FIG. 4 is a graph showing an example of a spectrum curve of floor vibration measured by the same method.

FIG. 5 is a graph showing a spectrum curve of floor impact sound corrected by the same method.

FIG. 6 is a perspective view showing a part of the measuring apparatus according to the second embodiment of the present invention.

FIG. 7 is a flowchart showing a measuring method of the same example.

FIG. 8 is a graph showing an example of a spectrum curve of floor panel vibration measured by the same method.

FIG. 9 is a graph showing a spectrum curve of a floor impact sound estimated by the same method.

[Explanation of symbols]

 1 Building 2 Sound source room 3 Sound receiving room 4 Floor 5 Floor panel 10 Measuring device 11 Heavy floor impact sound generator 12 Lightweight floor impact sound generator 13 Microphone 15 Vibration sensor 17 Digital data recorder 18 Octave analyzer 19 Microcomputer

Front page continuation (51) Int.Cl. ⁶ Identification code Office reference number FI Technical display location G01H 17/00 Z G01M 7/08 G01N 29/20 G10K 11/16 15/00 G10K 15/00 M

Claims (3)

[Claims] 1. A method for measuring a sound insulation performance of a floor constructed between a sound source room on an upper floor of a building and a sound receiving room on a lower floor, wherein a microphone is set in the sound receiving room away from the floor. In addition, a vibration sensor is attached to the floor, an impact sound is generated on the floor by a floor impact sound generator installed in the sound source room, and an octave analysis of the floor impact sound detected by the microphone is performed by the vibration sensor. Detected floor vibration octave analysis, while evaluating the floor sound insulation performance based on the octave analysis of the floor impact sound, based on the comparison of the octave analysis of the floor impact sound and octave analysis of the floor vibration, the floor impact A method for measuring floor sound insulation performance, which comprises analyzing noise components from each part of a building other than a floor mixed with sound, and correcting the evaluation of the floor sound insulation performance. 2. A floor panel used for constructing a floor is supported by a support member, a vibration sensor is attached to the floor panel, and a floor impact sound generator generates an impact sound on the floor panel. An octave analysis of the floor panel vibration detected in 1., and a floor sound insulation performance constructed by the floor panel is estimated based on the octave analysis of the floor panel vibration. 3. A floor impact sound generator for producing an impact sound on the floor, a microphone set apart from the floor, a vibration sensor attached to the floor, and an analog floor impact sound detected by the microphone. A digital data recorder for converting data and analog data of floor vibration detected by the vibration sensor into digital data of floor impact sound and digital data of floor vibration, respectively, and a floor recorded in the digital data recorder. An octave analyzer that converts impact sound digital data and floor vibration digital data into floor impact sound octave data and floor vibration octave data, respectively, and gives control commands to the digital data recorder and octave analyzer, respectively. Along with the octave data of the floor impact sound converted by the octave analyzer Measuring device of the floor sound insulation performance and a microcomputer for comparing processing and the floor vibration octave data.