RU2017121152A - 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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RU2017121152A
RU2017121152A RU2017121152A RU2017121152A RU2017121152A RU 2017121152 A RU2017121152 A RU 2017121152A RU 2017121152 A RU2017121152 A RU 2017121152A RU 2017121152 A RU2017121152 A RU 2017121152A RU 2017121152 A RU2017121152 A RU 2017121152A
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room
camera
sound pressure
pressure level
determined
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RU2017121152A
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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 the 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 the sound pressure level L p, dB, a test source of noise emission is determined from measurements of the average sound pressure level L cp to the measuring surface, with fitted nnym to its contour acoustic microphones for which the receiving area of the hemisphere 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 level of sound pressure 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 .
RU2017121152A 2017-06-16 2017-06-16 METHOD FOR RESEARCH OF ACOUSTIC CHARACTERISTICS OF THE OBJECT IN A REVERB CAMERA RU2017121152A (en)

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