RU2018144485A - METHOD FOR RESEARCH OF ACOUSTIC CHARACTERISTICS OF AN OBJECT IN A REVERB CAMERA - Google Patents

METHOD FOR RESEARCH OF ACOUSTIC CHARACTERISTICS OF AN OBJECT IN A REVERB CAMERA Download PDF

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RU2018144485A
RU2018144485A RU2018144485A RU2018144485A RU2018144485A RU 2018144485 A RU2018144485 A RU 2018144485A RU 2018144485 A RU2018144485 A RU 2018144485A RU 2018144485 A RU2018144485 A RU 2018144485A RU 2018144485 A RU2018144485 A RU 2018144485A
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room
camera
sound
pressure level
determined
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RU2018144485A
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Russian (ru)
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Олег Савельевич Кочетов
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Олег Савельевич Кочетов
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Способ для исследования акустических характеристик объектов в реверберационной камере, заключающийся в том, что источник излучения шума, устанавливают на полу реверберационной камеры, представляющей собой помещение объемом от 60 м3 до 1000 м3 с непараллельными, внутренними ограждениями, поверхность которых является отражателем звука, отличающийся тем, что уровень звуковой мощности Lp, дБ, испытуемого источника излучения шума определяют по результатам измерений среднего уровня звукового давления Lcp на измерительной поверхности, с установленными по ее контуру акустическими микрофонами, за которую принимают площадь полусферы S, м2, т.е. S=2 πr2, по формулеA method for studying the acoustic characteristics of objects in a reverberation chamber, namely, that a noise radiation source is installed on the floor of the reverberation chamber, which is a room with a volume of 60 m 3 to 1000 m 3 with non-parallel, internal fences, the surface of which is a sound reflector, characterized the fact that the sound power level L p , dB, of the tested noise emission source is determined by the results of measurements of the average sound pressure level L cp on the measuring surface, with acoustic microphones installed along its contour, for which the hemisphere area S, m 2 , i.e. . S = 2 πr 2 , by the formula
Figure 00000001
Figure 00000001
где Lcp - средний уровень звукового давления в камере; А - эквивалентная площадь звукопоглощения камеры, определяемая по формулеwhere L cp is the average sound pressure level in the chamber; A - equivalent sound absorption area of the camera, determined by the formula
Figure 00000002
Figure 00000002
причем эквивалентная площадь звукопоглощения камеры определяется экспериментально, по измерениям времени реверберации Тр помещения, т.е. времени, в течение которого уровень звукового давления в помещении уменьшается на 60 дБ после прекращения действия источника излучения шума, при этом V - объем помещения, м3; А0=1 м2.moreover, the equivalent sound absorption area of the camera is determined experimentally by measuring the reverberation time T r of the room, i.e. the time during which the sound pressure level in the room decreases by 60 dB after the termination of the action of the noise radiation source, while V is the volume of the room, m 3 ; And 0 = 1 m 2 .
RU2018144485A 2018-12-17 2018-12-17 METHOD FOR RESEARCH OF ACOUSTIC CHARACTERISTICS OF AN OBJECT IN A REVERB CAMERA RU2018144485A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112818553A (en) * 2021-02-07 2021-05-18 国网河北省电力有限公司沧州供电分公司 Equivalent source-based transformer radiation sound field calculation method

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112818553A (en) * 2021-02-07 2021-05-18 国网河北省电力有限公司沧州供电分公司 Equivalent source-based transformer radiation sound field calculation method

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