RU2017108112A - METHOD FOR RESEARCH OF ACOUSTIC CHARACTERISTICS OF THE OBJECT IN A REVERB CAMERA - Google Patents

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

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RU2017108112A
RU2017108112A RU2017108112A RU2017108112A RU2017108112A RU 2017108112 A RU2017108112 A RU 2017108112A RU 2017108112 A RU2017108112 A RU 2017108112A RU 2017108112 A RU2017108112 A RU 2017108112A RU 2017108112 A RU2017108112 A RU 2017108112A
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camera
room
sound
radiation source
measuring
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RU2017108112A
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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 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=2πr2, по формуле:A 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 to 1000 m 3 with non-parallel, internal fences, the surface of which is a sound reflector, characterized in that sound power level L p , dB, of the tested noise radiation source is determined by measuring the average sound pressure level L cp on the measuring surface, with acoustic microphones along its contour, for which they take the hemisphere area S, m 2 , i.e. S = 2πr 2 , by the formula:
Figure 00000001
Figure 00000001
где Lcp - средний уровень звукового давления в камере; А - эквивалентная площадь звукопоглощения камеры, определяемая по формуле:where L cp is the average sound pressure level in the chamber; And - the equivalent area of sound absorption 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 noise radiation source, while: V is the volume of the room, m 3 : A 0 = 1 m 2 .
RU2017108112A 2017-03-13 2017-03-13 METHOD FOR RESEARCH OF ACOUSTIC CHARACTERISTICS OF THE OBJECT IN A REVERB CAMERA RU2017108112A (en)

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