Covering the basics through advanced operation of spark-ignition and diesel engines.
Written by one of the most recognized and highly regarded names in internal combustion engines this trusted educational resource and professional reference covers the key physical and chemical processes that gov...
3. LAWAAI
p
3.1. Basisbegrippen dB = 20log
p ref
trillingen lichaam → drukgolven → oor
1. gehoordrempel en pijngrens ver uit mekaar
ppijn ≈ pdrempel ⋅ 107 ⇒ logaritmische schaal
2. als referentie p = 2 ⋅ 10-4 μbar
(kleinst waarneembaar geluidsniveau)
3. gevoeligheid gehoor verandert met frequentie
→ daarom ponderatiecurven
in voertuigtechniek ponderatiecurve A (in dB A) ;
± gelijklopend met gehoorgrens
ponderatie in meetapparatuur gesimuleerd door filters
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