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28 . 07. 2011. Lukáš Černý. Exploration and exploitation of acoustic shielding materials. Supervisor Prof. Dr. Ali H. Reshak. Environmental protection program of developted countries : 1. Air pollution 2. Water pollution 3. Acustic pressure High noise for long time can couse : - PowerPoint PPT Presentation
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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