noise in the workplace spain (italian meeting 2013)
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Post on 01-Apr-2016
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ÂTRANSCRIPT
Sound is a form of energy that is transmitted by pressure variation that the human ear can detect. Sound can also travel through other media, such as water or steel. Frequency and intensity are the two features of sound
WHAT IS SOUND?
Noise is any annoying, disturbing or unwanted sound, that disturbs people or makes it difficult to hear wanted sounds. Depending on the quantity of dB it can hurt in different ways
THE MEASUREMENT OF THE SOUND PRESSURE DOESN'T HAVE A LINEAR EQUIVALENCE RELATION.IT IS A LOGARITHMIC FUNCTION
EFFECTS OF NOISE ON HEALTH The decibel (dB) table compares some common sounds and shows how they rank
in potential harm to hearing. 70 dB is the point at which noise begins to harm hearing. To the ear, each 10 dB increase seems twice as loud.
Sound Levels and Human Response Common sounds Noise Level [dB] Effect
Rocket launching pad (no ear protection) 180 Irreversible hearing loss
Carrier deck jet operation (25 m). 140 Painfully loud
Thunderclap 130
Jet takeoff (60 m) 120 Maximum vocal effort
Rock concert 110 Extremely loud
Firecrackers 100 Very loud
Heavy truck (15 m). City traffic 90 Very annoying Hearing damage (8h)
Alarm clock (0,7 m). Hair dryer 80 Annoying
Noisy restaurant. Business office 70 Telephone use difficult
Conversational speech 60 Intrusive
Light auto traffic (30 m) 50 Quiet
Living-room, bedroom. Quiet office 40
Library. Soft whisper (5 m) 30 Very quiet
Broadcasting studio 20
10 Just audible
0 Hearing begins
Cardio-respiratory disfunction
Variations in the endocrine system
Irritate people
Reduce working efficiency
Disturb people
Hearing loss
Place Time Decibels(dB)
Hall Entry time
(8:20) 72
Corridor Between lesson 78-82
Normal Class Maths lesson
(11:35) 74
Normal Class English lesson
(14:00) 80
Playground Break (11:15) 90-95
Library Break(11:15) 68
Normal Class Break(11:15) 65
Hall Departure time 95
We can observe that in some moments of the day there is too much noise (78-79 dB), so it can be harmful. That happens because students are in corridors speaking loudly. Nevertheless, in other places there is more silence, maybe because some steps have already been taken. (Example: library)
When it’s yellow or green: Nothing will happen.
When it’s red: Students must lower their voice
Awareness posters: •Through a competition students make a poster to raise awareness of the importance of keeping silence • The winner will get between 50€ and 70€ for school supplies, books…