Technology for a better society A short presentation of SINTEF/NTNU – Acoustics Research Centre and a very short introduction to traffic noise and decibels Odd Kr. Ø. Pettersen, PhD Research Director SINTEF ICT Adjunct Professor NTNU LEO SEMINAR OSLO 2. JUNE 2016

Technology for a better society SINTEF is the largest independent research organisation in Scandinavia Leading expertise in the natural sciences and technology, environment, health and social science 2100 employees from more than 70 countries Annual sales of NOK 3 billion (EUR 400 mill) – customers in more than 60 countries An independent, not-for-profit research institute

Technology for a better society Our partnership with NTNU functions at both strategic and operational levels Joint use of laboratories and equipment SINTEF staff teach at NTNU NTNU personnel work on SINTEF projects Strategic coordination Cooperation between SINTEF and NTNU has developed over 65 years

Technology for a better society Acoustics Research Centre – ARC – NTNU and SINTEF ENVIRONMENTAL ACOUSTICS INDUSTRIAL ACOUSTICS COMMUNICATION ACOUSTICS Hearing and perception Signal processing and transducers Sound propagation

Technology for a better society 14 research scientists 4 professors 3 research engineers 3 adjunct professors 15 PhD/Master students

Technology for a better society Effects of noise on people CVD – cardio-vascular diseases – Nearly twice as many dies from road traffic noise as from road traffic accidents (Norway) Cognition: "ability to learn" – Children living in noisy areas are "slow learners" Noise costs the Norwegian society 14 billion per year Ref: The Directorate of Public Roads (Vegdirektoratet) WHO, 2011, Burden of disease from environmental noise. Quantification of healthy life years lost in Europe

Technology for a better society 7 NOISE SOURCE NOISE is unwanted sound. How noise is perceived (as annoyance) is a subjective experience by humans. It depends on the level of the noise as well as on time and place of the exposure. Sound – noise and decibels

Technology for a better society 8 L w = 10log(P/P 0 ) dB SOUND POWER P (Watt) NOISE SOURCE LwLw Sound – noise and decibels

Technology for a better society 9 L w = 10log(P/P 0 ) dB SOUND POWER P (Watt) NOISE SOURCE LwLw One car: L w = 70 dB Sound – noise and decibels

Technology for a better society 10 L w = 10log(P/P 0 ) dB SOUND POWER P (Watt) NOISE SOURCE LwLw One car: L w = 70 dB Two cars: Sound power increased by 10log(2) = + 3 dB L w = = 73 dB Sound – noise and decibels

Technology for a better society 11 L w = 10log(P/P 0 ) dB SOUND POWER P (Watt) NOISE SOURCE LwLw Ten cars: Sound power increased by 10log(10) = + 10 dB L w = ………..+70 = 80 dB Sound – noise and decibels

Technology for a better society 12 L w = 10log(P/P 0 ) dB SOUND POWER P (Watt) NOISE SOURCE LwLw Traffic volume increased from ADT to ADT Sound power increased by 10log(2) = 3 dB L DEN increased by 3 dB Sound – noise and decibels

Technology for a better society 13 L w = 10log(P/P 0 ) dB SOUND POWER P (Watt) NOISE SOURCE LwLw SOUND PRESSURE p (N/m2) L p = 10log (p/p 0 ) 2 dB L DEN L eq NOISE IMPACT Sound – noise and decibels

Technology for a better society 14 L w = 10log(P/P 0 ) dB SOUND POWER P (Watt) NOISE SOURCE LwLw SOUND PRESSURE p (N/m2) L p = 10log (p/p 0 ) 2 dB NOISE IMPACT Sound – noise and decibels

Technology for a better society 15 Sound – noise and decibels 10 m : 70dB 20 m : 67dB 100 m : 60dB 200 m : 57dB Road traffic : line source

Technology for a better society Noise sources – subjective evaluation: 16 Changes in dB levelSubjective evaluation +3Just noticeable +5Clearly noticeable +10Twice as high level

Technology for a better society 17 L w = 10log(P/P 0 ) dB SOUND POWER P (Watt) NOISE SOURCE LwLw The scope of this seminar

Technology for a better society Thank you 18