KR20030095918A - Sound absorption rate measuring device for underwater sound absorbing material with sensor calibration function - Google Patents

Sound absorption rate measuring device for underwater sound absorbing material with sensor calibration function Download PDF

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KR20030095918A
KR20030095918A KR1020020033550A KR20020033550A KR20030095918A KR 20030095918 A KR20030095918 A KR 20030095918A KR 1020020033550 A KR1020020033550 A KR 1020020033550A KR 20020033550 A KR20020033550 A KR 20020033550A KR 20030095918 A KR20030095918 A KR 20030095918A
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sound
absorbing material
sound absorbing
sensor
absorption rate
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KR1020020033550A
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Korean (ko)
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이동복
최종수
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이동복
최종수
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    • GPHYSICS
    • G01MEASURING; TESTING
    • G01NINVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N29/00Investigating or analysing materials by the use of ultrasonic, sonic or infrasonic waves; Visualisation of the interior of objects by transmitting ultrasonic or sonic waves through the object
    • G01N29/04Analysing solids
    • G01N29/09Analysing solids by measuring mechanical or acoustic impedance
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01NINVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N29/00Investigating or analysing materials by the use of ultrasonic, sonic or infrasonic waves; Visualisation of the interior of objects by transmitting ultrasonic or sonic waves through the object
    • G01N29/22Details, e.g. general constructional or apparatus details
    • G01N29/223Supports, positioning or alignment in fixed situation

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  • Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Biochemistry (AREA)
  • General Health & Medical Sciences (AREA)
  • General Physics & Mathematics (AREA)
  • Immunology (AREA)
  • Pathology (AREA)
  • Acoustics & Sound (AREA)
  • Measurement Of Mechanical Vibrations Or Ultrasonic Waves (AREA)

Abstract

PURPOSE: An apparatus for measuring a sound absorbing rate of a sound absorbing material is provided to effectively measure the sound absorbing rate of a sound absorbing material used underwater by forming an underwater environment in an impedance tube. CONSTITUTION: A sound absorbing rate measuring apparatus includes an impedance tube(10). A sound wave generator(11) is installed at one side of the impedance tube(10). A plurality of sensor attaching holes is formed in the impedance tube(10). A sensor compensating device is selectively coupled to an opening section of the impedance tube(10) so as to correct a frequency response function of a hydrophone(30). A test sample fixing device is selectively coupled to the opening section of the impedance tube(10) so as to obtain various measuring results by adjusting a distance between a sound absorbing material and the hydrophone(30). A CPU is provided to calculate a sounding absorbing rate of the sound absorbing material(1).

Description

센서 교정 기능이 부가된 수중용 흡음재의 흡음률 측정장치{omitted}Sound absorption rate measuring device for underwater sound absorbing material with sensor calibration function

본 발명은 수중에서 사용될 각종 흡음재의 흡음률을 측정하여 보다 실용적인 음향학적 특성을 파악할 수 있는 흡음률 측정장치에 관한 것으로, 특히 센서간의 거리 변화를 조절하여 보다 광범위한 관심 주파수 영역에서의 흡음특성을 파악할 수 있을 뿐만 아니라 다수의 음향 측정 센서의 교정실험을 수행할 수 있도록 한 센서 교정 기능이 부가된 수중용 흡음재의 흡음률 측정장치에 관한 것이다.The present invention relates to a sound absorption rate measuring apparatus that can measure the sound absorption rate of various sound absorbing materials to be used in water to grasp more practical acoustic characteristics, and in particular, it is possible to determine the sound absorption characteristics in a wider frequency range of interest by adjusting the distance change between sensors. In addition, the present invention relates to a sound absorption rate measuring apparatus for underwater sound absorbing material with a sensor calibration function for performing a calibration experiment of a plurality of acoustic measurement sensors.

소음 저감을 위한 소음대책 중 흡음재를 이용하여 소리의 전파 에너지를 감쇠기키는 방법이 가장 일반적이며 이러한 목적으로 사용되어지는 흡음재에 대한 평가량으로는 흡음률이 주로 사용되는 것이다.Among the noise countermeasures for noise reduction, the method of attenuating the propagation energy of sound by using sound absorbing material is the most common, and the sound absorption rate is mainly used as an evaluation amount for the sound absorbing material used for this purpose.

상기 흡음재의 흡음률을 측정하는 방법으로는 한국 산업규격 KS F2814-1996(관내법에 의한 건축재료의 수직 입사 흡음률 측정방법)과 ISO 10534-1과 ASTM C384에 규정되고 있다. 이러한 방법은 공통적으로 공기중에서 행해지며 임피던스관을 이용하여 한쪽에 시편(흡음재)을 설치하고 타측에서 음파를 발생시켜 측정값을 얻게 된다.As a method for measuring the sound absorption rate of the sound absorbing material, it is prescribed in Korean Industrial Standard KS F2814-1996 (Method of Measuring Vertical Incidence Sound Absorption Rate of Building Material by Inner Tube Method) and ISO 10534-1 and ASTM C384. This method is commonly performed in air, and by using an impedance tube, a specimen (sound absorbing material) is installed on one side and sound waves are generated on the other side to obtain a measured value.

그러나 상기 기본적 방법에 의해 흠읍률의 측정시 흡음재의 효과적인 설치와 위치조절(흡음재와 공기층의 결합에 따라 변형되는 측정값을 얻기 위함)을 위한 마땅한 장비가 제시되지 않아 정확하고 일률적인 흡음재의 흡음률 측정이 이루어지지 못한 것이었다.However, due to the basic method, it is not possible to provide the proper equipment for the effective installation and positioning of sound absorbing material in order to measure the defect rate (to obtain the measured value which is modified by the combination of sound absorbing material and air layer). This was not done.

이러한 문제점을 해결하기 위한 방안으로 본 발명 출원인의 선등록 고안인『등록실용신안공보 제0234333호 명칭 흡음재의 수직입사 흠음률 측정장치』가 제시되고 있는 것이었다.In order to solve this problem, the present inventors have been proposed a pre-registered design "Registration Utility Model Publication No. 0234333, vertical incident flaw rate measuring device of the sound absorbing material".

상기 선등록 고안은 흡음재의 설치가 정확하고 용이할 뿐만 아니라 흡음재의 위치조절이 미세하게 이루어져 위치 변형에 따른 다양한 변형값을 광범위하게 해석하므로써 보다 효과적으로 흡음재의 음향학적 특성(흡음재의 임피던스)을 얻을 수 있는 뛰어난 효과가 제공되는 것이었다.The pre-registered design is not only accurate and easy to install the sound absorbing material but also finely adjusts the position of the sound absorbing material, so that the acoustic characteristics of the sound absorbing material (impedance of the sound absorbing material) can be more effectively obtained by broadly analyzing various deformation values according to the positional deformation. The outstanding effect was that it was provided.

그러나 이러한 뛰어난 효과에도 불구하고 선등록 고안은 공기중에서만 흡음재의 성능을 평가할 수 있는 것으로 수중에서의 성능평가는 실행될 수 없어 그 사용범위가 매우 제한적인 것이었다.However, in spite of these outstanding effects, the pre-registered design can evaluate the performance of the sound absorbing material only in the air, and the performance evaluation in the water cannot be performed.

즉 공기중에서 흡음재의 성능 개선과 흡음 성능을 평가할 수 있는 방법은 본 발명 출원인의 선등록 고안 등과 같이 지속적으로 연구되어지고 있는 반면 수중에서는 공기중일때와 마찬가지로 흡음재의 음향 특성 평가량으로서 흡음률 측정이 매우 중요하나 흡음재의 음향특성 측정을 수행하기 위한 실험 환경구성에 있어서 제약을 받기 때문에 구체적인 측정 대안이 없는 실정이다.That is, the method of evaluating the performance and sound absorption performance of the sound absorbing material in the air has been continuously studied, such as the applicant of the present invention, while the sound absorption rate measurement is very important as the evaluation of the acoustic properties of the sound absorbing material as in the air. However, there is no specific measurement alternative because it is restricted in the experimental configuration for performing acoustic characteristics measurement of sound absorbing materials.

또한 음향 특성을 파악하기 위한 측정 센서인 마이크로폰의 설치 위치가 일정하게 제한되므로써 광범위한 주파수 영역에서의 세밀한 흡음특성을 파악할 수 없는 것이었다.In addition, since the installation position of the microphone, which is a measurement sensor for acquiring acoustic characteristics, was limited to a certain extent, detailed sound absorption characteristics in a wide frequency range could not be understood.

또한 한쌍의 하이드로폰을 이용하여 음파신호의 측정시 음압의 세기(amplitude)와 위상차(phase)에 있어서 발생할 수 있는 오차를 최소화하기 위해서는 반드시 측정된 복소 음파 전달 함수(frequency transfer function or acomolex ratio of the acoustic pressure response), 즉 주파수 응답 함수(frequency response function)를 보정해야만 하나 종래에는 측정 센서를 보정하기 위해서는 별도의 보정장치를 구비해야만 하는 것이었다.In addition, in order to minimize errors that may occur in the amplitude and phase of sound pressure when measuring a sound wave signal using a pair of hydrophones, a measured frequency transfer function or acomolex ratio of the The acoustic pressure response, or frequency response function, must be corrected, but conventionally, a separate calibration device has to be provided to calibrate the measurement sensor.

본 발명은 상기와 같은 문제점을 일소하기 위한 방안으로 안출된 것으로, 공기중일 때와 비교하여 수중에서 흡음재의 음향학적 파악에 있어서 단지 추가적으로 소리에너지를 전파시키는 매개체로서의 변형만을 고려해야 한다는 점에 착안하여 기존에 공기중에서 수행되어져 왔던 흡음재의 흡음률 측정 방법 중 임피던스관에서 서로 다른 두 지점에서 측정한 음압(sound pressure)의 전달함수(transfer function)를 이용하여 흡음률을 평가하였던 방법에 근거하여 이때의 소리에너지 매개체를 공기에서 물로 교체(임피던스관 내부에 물을 채워 수중상태로 만듬)하므로써, 공기중에서의 음향특성 측정 방법을 수중에서도 접목시킬 수 있음은 물론 수중이라는 특수한 실험 환경 제약을 효율적으로 최소화시킬 수 있게 함을 발명의 주된 목적으로 하는 것이다.The present invention has been devised as a way to eliminate the above problems, and focuses on the fact that only the transformation as a medium for propagating sound energy additionally needs to be considered in the acoustic grasp of the sound absorbing material in water compared to the air. The sound energy medium at this time based on the method of evaluating the sound absorption rate using the transfer function of sound pressure measured at two different points in the impedance tube among the sound absorption rate measurement methods of the sound absorbing material which has been performed in the air. By replacing the water with air (filling the water inside the impedance tube and making it underwater), it is possible to apply the method of measuring acoustic characteristics in the air and to minimize the special experimental environmental constraints of the water. It is the main object of the invention.

본 발명의 또 다른 목적은 기본적으로 측정에 있어서는 두 개의 음향 측정 센서를 사용하나, 보다 세밀한 관심 주파수 영역에서의 흡음 특성을 파악하기 위해서 센서간의 거리 변화를 조절하거나 혹은 두 개 이상의 다수의 음향 측정 센서를 동시에 적용하여 측정할 수 있도록 하는 것이다.Another object of the present invention is basically to use two acoustic measurement sensors in the measurement, but to adjust the distance change between the sensors or to determine the sound absorption characteristics in a more detailed frequency range of interest or two or more multiple acoustic measurement sensors It is to be able to measure by applying simultaneously.

이와 더불어 흡음재의 흡음률 측정 뿐만 아니라 다수의 음향 측정 센서의 교정 실험을 병행할 수 있도록 별도의 탈부착식 센서보정기를 부설하여 보다 정확한측정값을 얻을 수 있도록 하는 것이다.In addition, it is possible to obtain a more accurate measurement value by installing a separate removable sensor calibrator to perform the sound absorption rate measurement of the sound absorbing material as well as the calibration experiment of a plurality of acoustic measurement sensors.

도 1 은 본 발명이 적용된 흡음률 측정장치의 사시도1 is a perspective view of a sound absorption rate measuring apparatus to which the present invention is applied

도 2는 본 발명의 내부구조를 나타낸 종단면도Figure 2 is a longitudinal sectional view showing the internal structure of the present invention

도 3은 본 발명 임피던스관에 센서보정기가 결합되는 상태의 사시도Figure 3 is a perspective view of the sensor compensator coupled to the impedance tube of the present invention

도 4는 본 발명 임피던스관과 센서보정기의 결합상태 단면도Figure 4 is a cross-sectional view of the coupling state of the impedance tube and the sensor compensator of the present invention

도 5는 본 발명 센서취부홀에 하이드로폰이 취부되는 상태의 종단면도Figure 5 is a longitudinal cross-sectional view of the state in which the hydrophone is mounted to the sensor mounting hole of the present invention

도 6은 본 발명 임피던스관에 시편고정수단이 결합되는 상태의 사시도Figure 6 is a perspective view of the specimen fixing means coupled to the impedance tube of the present invention

도 7은 본 발명 임피던스관과 시편고정수단의 결합상태 단면도Figure 7 is a cross-sectional view of the coupling state of the impedance tube and the specimen fixing means of the present invention

도 8은 본 발명 임피던스관에 설치된 드레인밸브의 상세도Figure 8 is a detailed view of the drain valve installed in the impedance tube of the present invention

도 9의 (가)는 센서보정기의 실링부 확대 단면도9A is an enlarged cross-sectional view of a sealing part of a sensor calibrator.

(나)는 시편고정수단 실링판의 실링부 확대 단면도(B) is an enlarged cross-sectional view of the sealing portion of the specimen fixing means sealing plate.

[도면의 주요부분에 대한 부호의 설명][Explanation of symbols on the main parts of the drawings]

1: 흡음재 10: 임피던스관 11: 음파발생기1: sound absorbing material 10: impedance tube 11: sound wave generator

13: 드레인밸브 20: 센서취부홀 30: 하이드로폰13: Drain valve 20: Sensor mounting hole 30: Hydrophone

40: 센서보정기 44: 센서홀 50: 시편고정수단40: sensor compensator 44: sensor hole 50: specimen fixing means

51: 시편고정판 53: 거리조절봉 54: 실링판51: specimen fixing plate 53: distance adjustment rod 54: sealing plate

이하, 본 발명의 바람직한 실시예의 구성에 관해 상세하게 설명하기로 한다.Hereinafter, the configuration of the preferred embodiment of the present invention will be described in detail.

본 발명의 구성을 개략적으로 살펴보면 임피던스관 내부에 소음원과의 거리가 서로 다른 두 지점에 설치된 하이드로폰을 이용하여 측정한 음압(sound pressure)의 전달함수(transfer function)를 획득한 후 연산을 통해 흡음률을 측정하는 공지의 흡음률 측정장치에 있어서, 일측에 음파발생기(11)가 설치되고 타측이 개방된 형태의 임피던스관(10)과, 상기 음파발생기(11)와의 거리가 각기 다른 위치에 설치되는 다수의 센서취부홀(20)과, 상기 임피던스관(10)의 개방측에 선택적으로 결합되고 다수의 센서홀(44)에 끼워지는 하이드로폰(30)의 주파수 응답 함수를 보정하는 센서보정기(40)와, 상기 임피던스관(10)의 개방측에 선택적으로 결합되고 흡음재(1)와 하이드로폰(30)과의 거리를 조절하여 다양한 측정값을 얻게 하는 시편고정수단(50)과, 상기 센서취부홀(20)에 취부된 하이드로폰(30) 사이의 전달함수를 획득한 후 연산을 통해 흡음재(1)의 흡음률을 산출하는 중앙처리장치로 이루어진다.Looking at the configuration of the present invention roughly through the operation after obtaining the transfer function of the sound pressure (sound pressure) measured by using a hydrophone installed at two points with different distances from the noise source inside the impedance tube In the known sound absorption rate measuring device for measuring the number, the sound wave generator 11 is installed on one side and the other side of the impedance tube 10 of the open form, and the distance between the sound wave generator 11 is provided in a plurality of different locations A sensor compensator 40 that is selectively coupled to the sensor mounting hole 20 and the open side of the impedance tube 10 and corrects the frequency response function of the hydrophone 30 fitted into the plurality of sensor holes 44. And a specimen fixing means 50 which is selectively coupled to the open side of the impedance tube 10 and adjusts the distance between the sound absorbing material 1 and the hydrophone 30 to obtain various measurement values, and the sensor mounting hole. Mounted on 20 After obtaining the transfer function between the hydrophones 30 is made of a central processing unit for calculating the sound absorption rate of the sound absorbing material (1) through the calculation.

상기 개략적인 구성으로 이루어진 본 발명을 실시가능하도록 좀더 구체적으로 설명하기로 한다.It will be described in more detail to enable the present invention made of the above schematic configuration.

임피던스관(10)은 원통형으로 내경이 관전체에 걸쳐 일정하게 구성되고 일측에 음파발생기(11)가 설치되고 음파발생기(11)의 타측은 개방되며 일정간격으로 설치된 거치대(12)에 안정되게 거치되는 한편 상기 음파발생기(11)의 인접된 위치의저부에는 드레인밸브(13)가 설치된다.Impedance tube 10 is cylindrical, the inner diameter is uniformly configured throughout the tube, the sound wave generator 11 is installed on one side, the other side of the sound wave generator 11 is open and mounted on the cradle 12 installed at regular intervals On the other hand, the drain valve 13 is installed at the bottom of the adjacent position of the sound wave generator (11).

드레인밸브(13)는 수중 환경을 조성하기 위해 임피던스관(10) 내부에 물이 채워진 후 흡음재(1)의 장착과 제거시 또는 하이드로폰(30)의 위치 변경시 일시적으로 관내부에서 미처 제거되지 못한 공기 기포로 인해 발생되는 압력변화에 의해 측정 오류를 유발시키는 인자를 제거함과 동시에 음파 전달 매개체인 물의 배수문제를 해결하기 위한 것으로, 하이드로폰(30)에 영향을 미치지 않도록 음파발생기(11)에 최대한 인접된 위치에 설치함이 바람직하다.The drain valve 13 is temporarily removed from the inside of the pipe during the installation and removal of the sound absorbing material 1 or when the position of the hydrophone 30 is changed after the water is filled in the impedance pipe 10 to create an underwater environment. It is to solve the problem of drainage of water, which is a sound wave transmission medium, and at the same time to remove the factors causing measurement error due to the pressure change caused by the poor air bubbles, so as not to affect the hydrophone 30 to the sound wave generator 11 It is desirable to install in the most adjacent position.

상기 음파발생기(11)의 전면에는 도면상 도시되지 않았지만 공기중에서 작동하는 음파발생기(11)와 물로 채워지는 임피던스관(10)의 특수한 관계에 의해 그 사사이에는 실리콘판으로 격리되므로써 공진이나 음파발생기(11)의 구동으로 인해 임피던스관(10)으로 전달될 수 있는 진동을 최소화함은 물론 누수를 막아주며, 임피던스관(10)으로의 음파 전달을 극대화시키게 된다. 여기에서 격리를 위한 판으로 실리콘판을 사용한 이유는 철판이나 알루미늄 등의 다른 재질에 비해 실리콘판이 공기에서 물로의 음파전달이 더욱 용이하기 때문이다.Although not shown in the drawing on the front surface of the sound wave generator 11, by the special relationship between the sound wave generator 11 that operates in the air and the impedance tube 10 filled with water, there is a resonance between the sound wave generator Due to the operation of the (11) to minimize the vibration that can be transmitted to the impedance tube 10, as well as to prevent leakage, to maximize the sound wave transmission to the impedance tube (10). The reason why the silicon plate is used as the plate for isolation is because the silicon plate is easier to transmit sound waves from air to water than other materials such as iron plate or aluminum.

수중 작업용 측정 센서인 하이드로폰(30)을 취부시키기 위한 센서취부홀(20)은 종래 일정한 위치의 두곳에 설치됐던 것과 달리 음파발생기(11)와의 거리가 각기 다른 위치에 다수개 설치된다.The sensor mounting holes 20 for attaching the hydrophone 30, which is a measurement sensor for underwater operation, are installed in a plurality of locations at different distances from the sound wave generator 11, unlike those conventionally installed at two fixed locations.

따라서 다수의 센서취부홀(20)에는 한쌍의 하이드로폰(30)을 상호간의 거리를 선택적으로 조절하여 취부시킬 수 있는 한편 두 개 이상 다수의 하이드로폰(30)을 동시에 취부시켜 보다 세밀한 관심 주파수 영역에서 보다 광범위한 흡음특성을측정할 수 있게 된다.Therefore, a plurality of sensor mounting holes 20 can be mounted by selectively adjusting the distance between the pair of hydrophones 30, while at least two or more hydrophones 30 can be mounted at the same time for a more detailed frequency range of interest. A wider range of sound absorption properties can be measured at.

한편 상기 하이드로폰(30)은 동일한 타입이라 하더라도 20kHz까지는 균등한 성능을 보여주지만 측정결과 중 발생할 수 있는 여러 오차 요인으로 반드시 보정과정을 겨쳐야만 정확한 측정값을 얻을 수 있는 것으로 본 발명의 센서보정기(40)에 의해 별도의 보정장치를 구비하지 않더라도 부가적으로 하이드로폰(30)의 보정을 병행할 수 있는 것이다.On the other hand, the hydrophone 30 shows the same performance even up to 20kHz even in the same type, but accurate measurement values can be obtained only through the correction process due to various error factors that may occur in the measurement results. By 40, even if a separate correction device is not provided, the hydrophone 30 may be additionally corrected in parallel.

이러한 목적의 센서보정기(40)는 선택적으로 임피던스관(10)의 개방측에 끼워지는 끼움부(41)가 형성되고 끼움부(41)의 외주연에는 기밀을 유지하기 위한 오링(42)이 설치되며 끼움부(41)의 선단에는 플랜지(43)가 형성되어 임피던스관(10)의 개방부를 효과적으로 막아주는 한편 방사상으로 다수의 센서홀(44)이 형성되어 상기 센서홀(44)에 보정하고자 하는 다수개의 하이드로폰(30)을 끼운 상태에서 센서간에 발생할 수 있는 측정 음압에 대한 세기와 위상차를 보정할 수 있게 된다.The sensor compensator 40 for this purpose is provided with a fitting portion 41 to be selectively fitted on the open side of the impedance tube 10, and an O-ring 42 is installed on the outer periphery of the fitting portion 41 to maintain airtightness. At the tip of the fitting portion 41, a flange 43 is formed to effectively prevent the opening of the impedance tube 10, and a plurality of sensor holes 44 are formed radially to correct the sensor holes 44. It is possible to correct the intensity and phase difference with respect to the measured sound pressure that may occur between the sensors in a state where a plurality of hydrophones 30 are fitted.

상기 센서보정기(40)에 의한 하이드로폰(30)의 보정작업 후 본격적인 흡음재(1)의 흡음률을 측정하고자 흡음재(1)를 임피던스관(10) 내부에 위치시키기 위한 시편고정수단(50)은 임피던스관(10)의 개방측에 선택적으로 결합되는 것으로 일측에 임피던스관(10) 내부에 삽입되고 흡음재(1)를 고정시킬 수 있는 시편고정판(51) 구비되고 상기 시편고정판(51)의 일측 선단에는 하이드로폰(30)과 시편고정판(51)사이의 거리를 조절하기 위해 작동손잡이(52)가 형성된 거리조절봉(53)이 고정 설치되며 상기 거리조절봉(53)의 외측에는 임피던스관(10)의 개방측을 선택적으로 실링하기 위한 실링판(54)이 끼워지게 설치된다.In order to measure the sound absorption rate of the sound absorbing material 1 in earnest after the calibration operation of the hydrophone 30 by the sensor calibrator 40, the specimen fixing means 50 for positioning the sound absorbing material 1 in the impedance pipe 10 is impedance It is selectively coupled to the open side of the tube 10 is provided with a specimen fixing plate 51 which is inserted into the impedance tube 10 on one side and can be fixed to the sound absorbing material (1) and at one end of the specimen fixing plate 51 In order to adjust the distance between the hydrophone 30 and the specimen fixing plate 51, a distance adjusting rod 53 having an operation knob 52 is fixedly installed, and an impedance tube 10 is disposed outside the distance adjusting rod 53. A sealing plate 54 for selectively sealing the open side of is installed to be fitted.

여기에서 시편고정판(51)의 외주연과 실링판(54)의 끼움홈(55)에는 오링(42)이 설치되어 임피던스관(10) 내부의 기밀을 유지하여 수중이라는 측정 환경을 제공할 수 있게 된다.Here, the O-ring 42 is installed at the outer periphery of the specimen fixing plate 51 and the fitting groove 55 of the sealing plate 54 to maintain the airtight inside the impedance tube 10 so that the measurement environment of underwater can be provided. do.

이러한 구성으로 이루어진 본 발명에 의한 센서의 보정과정과, 흡음재(1)의 흡음률 측정과정에 대해 설명하기로 한다.The calibration process of the sensor according to the present invention having such a configuration and the sound absorption rate measurement process of the sound absorbing material 1 will be described.

우선적으로 음압의 세기와 위상차에 있어서 발생될 수 있는 오차를 최소화하기 위한 목적으로 하이드로폰(30)의 주파수 응답 함수를 보정하기 위해서는 센서보정기(40)의 센서홀(44)에 보정하고자 하는 하이드로폰(30)을 끼운 상태에서 센서보정기(40)를 도 4와 같이 임피던스관(10)의 개방측에 결합시킨다.The hydrophone to be corrected in the sensor hole 44 of the sensor compensator 40 in order to first correct the frequency response function of the hydrophone 30 for the purpose of minimizing errors that may occur in the sound pressure intensity and phase difference. The sensor compensator 40 is coupled to the open side of the impedance tube 10 as shown in FIG.

센서보정기(40)의 결합이 완료되면 드레인밸브(13)를 잠근 상태에서 센서취부홀(20)을 통해 물을 주입하여 임피던스관(10) 내부가 수중 환경이 조성되도록 한다.When the coupling of the sensor compensator 40 is completed, water is injected through the sensor mounting hole 20 while the drain valve 13 is locked to create an underwater environment in the impedance tube 10.

이러한 상태에서 음파발생기(11)를 구동시켜 음파를 생성하면 여기에서 발생되는 음파가 센서보정기(40)에 고정된 하이드로폰(30)에 전달됨을 통해 각각의 하이드로폰(30)의 달리하는 주파수 응답 함수를 연산과정을 통해 보정하므로써 보다 정확한 흡음률의 측정이 가능하게 된다.In this state, when the sound wave generator 11 is driven to generate sound waves, the sound waves generated therein are transmitted to the hydrophones 30 fixed to the sensor calibrator 40, and thus the frequency response of each hydrophone 30 is different. By correcting the function through the calculation process, more accurate sound absorption can be measured.

다음으로 상기와 같이 교정이 완료된 하이드로폰(30)을 이용하여 흡음재(1)의 흡음률 측정과정을 설명하기로 한다.Next, the sound absorption rate measurement process of the sound absorbing material 1 will be described using the hydrophone 30 having been calibrated as described above.

교정이 완료된 하이드로폰(30)은 도 5와 같이 센서고정편(31)에 고정시킨 상태에서 상기 센서고정편(31)을 센서취부홀(20)에 취부시키되 다수의센서취부홀(20)을 통해 하이드로폰(30)간의 간격을 조절하거나 두 개 이상 다수의 하이드로폰(30)을 취부시켜 축소된 관심 주파수 영역에서 보다 세밀한 측정을 수행할 수 있도록 한다.The hydrophone 30, which has been calibrated, attaches the sensor fixing piece 31 to the sensor mounting hole 20 in a state in which the hydrophone 30 is fixed to the sensor fixing piece 31 as shown in FIG. By adjusting the spacing between the hydrophones 30 or by mounting two or more hydrophones 30, more detailed measurements can be performed in the reduced frequency region of interest.

상기 하이드로폰(30)의 취부와 함께 센서보정기(40)를 탈착한 상태에서 시편고정수단(50)의 시편고정판(51)에 흡음재(1)를 부착시킨 후 시편고정판(51)을 도 7과 같이 임피던스관(10) 내부에 끼운상태에서 실링판(54)을 임피던스관(10)의 개방측에 결합시키고 거리조절봉(53)을 이용하여 하이드로폰(30)과 흡음재(1)의 거리를 조절한다.After attaching the sound absorbing material 1 to the specimen fixing plate 51 of the specimen fixing means 50 in the state in which the sensor compensator 40 is removed with the mounting of the hydrophone 30, the specimen fixing plate 51 is shown in FIG. The sealing plate 54 is coupled to the open side of the impedance tube 10 in the state of being fitted inside the impedance tube 10 as described above, and the distance between the hydrophone 30 and the sound absorbing material 1 is adjusted using the distance adjusting rod 53. Adjust

이러한 상태에서 임피던스관(10)의 내부에는 또 다시 물을 주입하여 수중 환경을 조성한 후 음파발생기(11)를 구동시켜 음파를 생성한다.In such a state, the water is injected again into the impedance tube 10 to create an underwater environment, and then drive the sound wave generator 11 to generate sound waves.

음파발생기(11)에 의해 생성된 음파는 흡음재(1)로 전달되고 이 과정에서 각 하이드로폰(30)의 전달함수를 획득하며 상기 전달함수로부터 중앙처리장치의 연산에 의해 흡음재의 흡음률을 측정할 수 있게 된다.The sound waves generated by the sound wave generator 11 are delivered to the sound absorbing material 1, and in this process, the sound absorbing rate of the sound absorbing material can be measured by calculation of the central processing unit from the transmission function. It becomes possible.

이상 살펴본 바와 같은 본 발명은 임피던스관의 내부에 수중환경을 조성하여 수중에서 사용되는 흡음재의 흡음률을 측정할 수 있음은 물론 센서간의 거리 변화를 조절하거나 혹은 두 개 이상 다수의 센서를 동시에 취부시켜 보다 세밀한 주파수 영역에서의 흡음률을 측정할 수 있으며, 부가적으로 다수의 음파 측정 센서의 교정실험을 병행할 수 있는 효과가 있는 것이다.As described above, the present invention can measure the sound absorption rate of the sound absorbing material used in the water by creating an underwater environment inside the impedance tube, as well as adjusting the distance change between the sensors or by mounting two or more sensors at the same time. It is possible to measure the sound absorption rate in the fine frequency domain, and additionally, it is possible to perform the calibration experiment of a plurality of sound wave measuring sensors.

Claims (6)

임피던스관 내부에 소음원과의 거리가 서로 다른 두 지점에 설치된 마이크로폰을 이용하여 측정한 음압(sound pressure)의 전달함수(transfer function)를 획득한 후 연산을 통해 흡음률을 측정하는 흡음률 측정장치에 있어서,In the sound absorption rate measuring device for measuring the sound absorption rate by calculating the transfer function of the sound pressure (sound pressure) measured by using a microphone installed at two points different from the noise source inside the impedance pipe, 일측에 설치된 음파발생기(11)의 인접된 저부에 드레인밸브(13)가 설치되고 타측이 개방되며 일정간격으로 설치된 다수의 거치대(12)에 거치된 임피던스관(10)과,An impedance pipe 10 mounted to a plurality of cradles 12 installed at a predetermined interval with a drain valve 13 installed at an adjacent bottom of an acoustic wave generator 11 installed at one side thereof, 상기 음파발생기(11)와의 거리가 각기 다른 위치에 설치된 다수의 센서취부홀(20)과,A plurality of sensor mounting holes 20 installed at different distances from the sound wave generator 11; 상기 임피던스관(10)의 개방측에 선택적으로 결합되고 다수의 센서홀(44)에 끼워지는 하이드로폰(30)의 주파수 응답 함수를 보정하는 센서보정기(40)와,A sensor compensator 40 selectively coupled to the open side of the impedance tube 10 and correcting a frequency response function of the hydrophone 30 fitted into the plurality of sensor holes 44; 상기 임피던스관(10)의 개방측에 선택적으로 결합되고 시편고정판(51)에 고정된 흡음재(1)와 하이드로폰(30)과의 거리를 조절하여 다양한 측정값을 얻게 하는 시편고정수단(50)과,Specimen fixing means 50 is selectively coupled to the open side of the impedance tube 10 and adjusted to the distance between the sound absorbing material 1 and the hydrophone 30 fixed to the specimen fixing plate 51 to obtain a variety of measurements and, 상기 센서취부홀(20)에 취부된 하이드로폰(30) 사이의 전달함수를 획득한 후 연산을 통해 흡음재(1)의 흡음률을 산출하는 중앙처리장치로 이루어진 것을 특징으로 하는 센서 교정 기능이 부가된 수중용 흡음재의 흡음률 측정장치.The sensor calibration function is characterized in that the sensor is configured to obtain a transfer function between the hydrophones 30 mounted in the sensor mounting hole 20 and then calculate the sound absorption rate of the sound absorbing material 1 through calculation. Sound absorption rate measuring device for underwater sound absorbing material. 청구항 1에 있어서,The method according to claim 1, 센서취부홀(20)을 통해서는 물이 투입되어 임피던스관(10) 내부에 수중 환경을 조성하게 되고, 드레인밸브(13)를 통해 미처 제거되지 못한 공기 기포와 물이 배출되는 것을 특징으로 하는 센서 교정 기능이 부가된 수중용 흡음재의 흡음률 측정장치.Water is introduced through the sensor mounting hole 20 to create an underwater environment inside the impedance tube 10, and the air bubbles and water that are not removed through the drain valve 13 are discharged. Absorption rate measuring device of underwater sound absorbing material with calibration function. 청구항 1에 있어서,The method according to claim 1, 다수의 센서취부홀(20)에는 한쌍의 하이드로폰(30) 상호간의 거리를 선택적으로 조절하여 취부하는 한편 두 개 이상 다수의 하이드로폰(30)을 동시에 취부시켜 보다 세밀한 관심 주파수 영역에서 광범위한 흡음특성을 측정할 수 있는 것을 특징으로 하는 센서 보정 기능이 부가된 수중용 흡음재의 흡음률 측정장치.A plurality of sensor mounting holes 20 can be mounted by selectively adjusting the distance between a pair of hydrophones 30, while at least two hydrophones 30 can be mounted at the same time for a wide range of sound absorption characteristics in a more detailed frequency region of interest. Absorption rate measuring device of the sound absorbing material for the water added sensor correction function, characterized in that it can measure the. 청구항 1에 있어서,The method according to claim 1, 센서보정기(40)는 임피던스관(10)의 개방측에 끼워지는 끼움부(41) 외주연에 기밀을 유지하기 위한 오링(42)이 설치되며 끼움부(41) 선단에는 플랜지(43)가 형성되며 방사상으로 다수의 센서홀(44)이 형성된 것을 특징으로 하는 센서 보정 기능이 부가된 수중용 흡음재의 흡음률 측정장치.The sensor compensator 40 is provided with an O-ring 42 for maintaining airtightness at the outer circumference of the fitting portion 41 fitted to the open side of the impedance tube 10, and a flange 43 is formed at the tip of the fitting portion 41. And a plurality of sensor holes 44 are formed radially, and the sound absorption rate measuring apparatus of the sound absorbing material for underwater with a sensor correction function is added. 청구항 1에 있어서,The method according to claim 1, 시편고정수단(50)은 임피던스관(10) 내부에 삽입되고 흡음재(1)가 고정되는 시편고정판(51)과,Specimen fixing means 50 is a specimen fixing plate 51 is inserted into the impedance tube 10 and the sound absorbing material 1 is fixed, 상기 시편고정판(51) 일측 선단에 고정되고 하이드로폰(30)과 시편고정판(51) 사이의 거리를 조절하는 거리조절봉(53)과,A distance adjusting rod 53 fixed to one end of the specimen fixing plate 51 and adjusting a distance between the hydrophone 30 and the specimen fixing plate 51; 상기 거리조절봉(53) 외측에 끼워지고 임피던스관(10)의 개방측을 실링하기 위해 선택적으로 결합되는 실링판(54)으로 이루어진 것을 특징으로 하는 센서 보정 기능이 부가된 수중용 흡음재의 흡음률 측정장치.Measurement of sound absorption rate of the sound absorbing material for underwater sound absorbing material with a sensor correction function, characterized in that made of a sealing plate 54 fitted to the outside of the distance adjusting rod 53 and selectively coupled to seal the open side of the impedance tube 10. Device. 청구항 1에 있어서,The method according to claim 1, 공기중에서 작동하는 음파발생기(11)와 물로 채워지는 임피던스관(10)의 사이에는 실리콘판으로 격리되어 누수를 막아주는 동시에 임피던스관(10)으로의 음파 전달이 극대화되는 것을 특징으로 하는 센서 보정 기능이 부가된 수중용 흡음재의 흡음률 측정장치.Sensor correction function, characterized in that the sound wave generator 11 operating in the air and the impedance tube 10 filled with water is isolated by a silicon plate to prevent leakage and at the same time maximize the transmission of sound waves to the impedance tube 10 The sound absorption rate measuring apparatus of this added underwater sound absorbing material.
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CN104535647A (en) * 2014-11-26 2015-04-22 华晨汽车集团控股有限公司 Prediction apparatus for sound absorption and insulation performance of multilayer material and method
CN105651823A (en) * 2015-12-30 2016-06-08 河海大学 Wharf's foundation pile damage detecting instrument underwater arrangement device, detection device and method
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KR20220161650A (en) * 2021-05-30 2022-12-07 두세진 Sound Absorption Measuring Method and Apparatus Utilizing Electrical Impedance of the Speaker

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