Lukáš Černý

28. 07. 2011

Exploration and exploitation of acoustic shielding materials

Supervisor Prof. Dr. Ali H. Reshak

Environmental protection program of developted countries:

1. Air pollution2. Water pollution 3. Acustic pressure

High noise for long time can couse:

1. Specific disturbancs Deafness

2. Non-specific disturbancs Psychical problems Low Performance

Ear translates frequency into nerve impulses

Low frequency under 16 - 20Hz infrasound

High frequency over 20 KHz ultrasound

Absorbing

Diffusing

Bass trap

Reduce noise Changing filtres Individually use Excellent sound

Background 34 dB Noise level 45,5 dB Day limit 50dB 6am – 10

pm Night limit 40dB 10pm –

6am Reduce noise 5,5dB till

125Hz

Thanks to:Supervisor prof. Dr. Ali H. ReshakMy colleagues for supportSummer school for opportunity Sponsor