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ID number:804921
 
Author:
Evaluation:
Published: 02.05.2011.
Language: Latvian
Level: College/University
Literature: n/a
References: Not used
Extract

4. uzdevums
Trokšņa avotu akustiskie līmeņi un skaņas absorbcijas un izolācijas līmeņi.
Skaņas absorbcija ir process kā rezultātā kāda daļa skaņas svārstību enerģijas tiek absorbēta skaņas viļņiem saduroties ar materiāla virsmu.
Dots:
Lizm. = 100 dB P =265 kg/ m2
K = 60 m2 V = 500 m3
θ = 4π ƒvid = 250 Hz
l = 10 m Siz = 36 m2
α = 0.4 Lnorm.= 54 dB
S = 140 m2 π ≈ 3.14
Jāaprēķina:
1. Trokšņa avota akustiskos līmeņus
2. Skaņas absorbcijas un izolācijas pasākumus.

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