SU1682908A1 - Method of determination of acoustic absorptivity of sound insulation structures - Google Patents
Method of determination of acoustic absorptivity of sound insulation structures Download PDFInfo
- Publication number
- SU1682908A1 SU1682908A1 SU894483759A SU4483759A SU1682908A1 SU 1682908 A1 SU1682908 A1 SU 1682908A1 SU 894483759 A SU894483759 A SU 894483759A SU 4483759 A SU4483759 A SU 4483759A SU 1682908 A1 SU1682908 A1 SU 1682908A1
- Authority
- SU
- USSR - Soviet Union
- Prior art keywords
- sound
- point
- frequency
- sound pressure
- microphone
- Prior art date
Links
- 238000000034 method Methods 0.000 title claims description 5
- 238000009413 insulation Methods 0.000 title 1
- 238000010521 absorption reaction Methods 0.000 claims abstract description 7
- 238000005259 measurement Methods 0.000 claims description 3
- 239000000463 material Substances 0.000 abstract description 2
- 230000010355 oscillation Effects 0.000 abstract 1
- 230000005520 electrodynamics Effects 0.000 description 2
- 239000011358 absorbing material Substances 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000001902 propagating effect Effects 0.000 description 1
Landscapes
- Measurement Of Mechanical Vibrations Or Ultrasonic Waves (AREA)
- Investigating Or Analyzing Materials By The Use Of Ultrasonic Waves (AREA)
Abstract
Изобретение относитс к строительной акустике и может быть использовано дл определени звукопоглощающих свойств материалов и конструкций. Цель изобретени - повышение производительности путем проведени измерений в одной точке. В произвольной точке внутри акустического интерферометра устанавливают микрофон и измер ют звуковое давление на одной частоте звукового пол , затем измен ют частоту колебаний до получени частоты, при которой устанавливаетс минимум звукового давлени в той же точке и с учетом измеренных звуковых давлений по расчетной формуле определ ют коэффициент звукопоглощени . 1 илThe invention relates to building acoustics and can be used to determine the sound-absorbing properties of materials and structures. The purpose of the invention is to increase productivity by measuring at one point. At an arbitrary point inside the acoustic interferometer, a microphone is installed and the sound pressure is measured at one frequency of the sound field, then the oscillation frequency is changed to obtain a frequency at which the minimum sound pressure is established at the same point and the coefficient is determined using the calculated sound pressure sound absorption. 1 silt
Description
(Л(L
СWITH
Изобретение относитс к области строительной акустики и может быть использовано дл определени звукопоглощающих свойств материалов и конструкцийThe invention relates to the field of building acoustics and can be used to determine the sound-absorbing properties of materials and structures.
Целью изобретени вл етс повышение производительности путем проведени измерений в одной точке.The aim of the invention is to increase productivity by measuring at one point.
На чертеже показана схема устройства, реализующего способ определени коэффициента звукопоглощени ,The drawing shows a diagram of a device implementing a method for determining sound absorption coefficient,
Устройство содержит состо щую из нескольких частей трубу 1 квадратного сечени , с одной стороны которой установлен образец2 испытуемой конструкции, закрепленный на поршне 3, а на другом конце трубы установлены конический рупор 4 с звукопоглощающим материалом 5 и электродинамический излучатель 6, плотно прилегающий к рупору 4 и размещенный в звукопоглощающей оболочке 7. Кроме того,The device contains a multi-part pipe 1 of square section, on one side of which a sample 2 of the tested structure is mounted, mounted on the piston 3, and on the other end of the pipe there is a conical horn 4 with sound-absorbing material 5 and an electrodynamic radiator 6 tightly attached to the horn 4 and placed in a sound-absorbing shell 7. In addition,
обозначены фланцевые соединени 8 частей трубы 1 Внутри трубы 1 установлен микрофон (не показан) дл приема упругих колебаний, распростран ющиес на грубе 1The flanged connections of 8 parts of the pipe 1 are indicated. Inside the pipe 1 there is a microphone (not shown) for receiving elastic vibrations propagating on the body 1.
Способ определени коэффициента звукопоглощени звукопоглощающих конструкций осуществл етс следующим образомThe method for determining the sound absorption coefficient of sound-absorbing structures is as follows.
В трубу 1 устанавливаетс образец 2 звукопоглощающей конструкции, который закрепл етс на поршне 3 С помощью электродинамического излучател 6 через рупор 4 в трубе 1 возбуждают звуковое поле с помощью установленного в трубе 1 микро- Фона в любой произвольной точке х,, по оси трубы измер ют в этой точке звуковое дао ление PI на первой частоте f звукового пол Затем измен ют частоту в процессе непрерывного измерени звукового давлени до получени частоты fi/ин, при которой устаО 00A sample 2 of a sound-absorbing structure is installed in pipe 1, which is attached to the piston 3 With the help of an electrodynamic radiator 6, through a horn 4 in pipe 1, the sound field is excited using a micro background installed in pipe 1 at any arbitrary point x, at this point, the sound response PI at the first frequency f of the sound field. Then the frequency is changed during the continuous measurement of the sound pressure to obtain the frequency fi / in, at which the frequency 00
гоgo
ЮYU
оabout
0000
навливаетс минимум звукового давлени Рмин в той же точке xi. После проведенных измерений вычисл ют коэффициент звукопоглощени a. (f) по формулеThe minimum sound pressure Pmin is applied at the same point xi. After the measurements, the sound absorption coefficient a is calculated. (f) according to the formula
а(0 a (0
4tha/4tha /
(1 +thy;)(1 + thy;)
f) - 0,5 arcchf) - 0.5 arcch
1 -N2 I cos 2 K(xt -x2) I1 -N2 I cos 2 K (xt -x2) I
1 -N 1 -N
N Pi/Рмин; К-К|-КМин, где PI, Рмин - соответственно звуковое дав- ление в точке xi при частотах fi и Тмин.Pi / Pmin; KK | -KMin, where PI, Pmin - respectively, the sound pressure at the point xi at frequencies fi and Tmin.
Ki, КМин - соответственно волновые числа при частотах fi и fMHn;Ki, KMin - wave numbers at frequencies fi and fMHn, respectively;
xi-x2 Ах - 0 - линейные параметры,xi-x2 Ah - 0 - linear parameters,
характеризующие размер микрофона, уста- новленного в точке xi.characterizing the size of the microphone mounted at point xi.
Claims (1)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| SU894483759A SU1682908A1 (en) | 1989-09-19 | 1989-09-19 | Method of determination of acoustic absorptivity of sound insulation structures |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| SU894483759A SU1682908A1 (en) | 1989-09-19 | 1989-09-19 | Method of determination of acoustic absorptivity of sound insulation structures |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| SU1682908A1 true SU1682908A1 (en) | 1991-10-07 |
Family
ID=21399756
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| SU894483759A SU1682908A1 (en) | 1989-09-19 | 1989-09-19 | Method of determination of acoustic absorptivity of sound insulation structures |
Country Status (1)
| Country | Link |
|---|---|
| SU (1) | SU1682908A1 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103675104A (en) * | 2013-11-26 | 2014-03-26 | 同济大学 | Method and device for measuring random incidence sound-absorbing coefficient/sound-absorbing quantity of material |
| CN104407056A (en) * | 2014-11-28 | 2015-03-11 | 歌尔声学股份有限公司 | Device and method for testing impedance characteristic and expansion performance of sound absorption material |
-
1989
- 1989-09-19 SU SU894483759A patent/SU1682908A1/en active
Non-Patent Citations (1)
| Title |
|---|
| Авторское свидетельство СССР № 1615876, кл G 01 N 29/00, 1989 * |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103675104A (en) * | 2013-11-26 | 2014-03-26 | 同济大学 | Method and device for measuring random incidence sound-absorbing coefficient/sound-absorbing quantity of material |
| CN104407056A (en) * | 2014-11-28 | 2015-03-11 | 歌尔声学股份有限公司 | Device and method for testing impedance characteristic and expansion performance of sound absorption material |
| WO2016082526A1 (en) * | 2014-11-28 | 2016-06-02 | 歌尔声学股份有限公司 | Device and method for testing impedance characteristic and expansion performance of sound absorption material |
| US10197438B2 (en) | 2014-11-28 | 2019-02-05 | Goertek Inc. | Device and method for testing impedance characteristic and expansion performance of sound absorption material |
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