VRIJE UNIVERSITEIT BRUSSEL Acoustics - the Dept. of ...

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128 CHAPTER 8. NOISE ON THE WORK FLOORFigure 8.1: List of the causes of permanent unfitness for work in the past 20years. Source : Fund for occupational diseases.development and the protection of measures to control the sound at thesource. When the exposure probably exceeds 85 dBA;The employer must provide means to protect the hearing to his employeesin a sufficient degree;Exposed employees have the right to have a hearing examination.The employees (or their representative in the enterprise) receive anadequate information session or possibly education towards the risks ofexposure to noise.When the daily exposure exceeds 90 dBA the following obligations mustbe fulfilled :The causes of the noise must be identified and a program for the reductionof the noise must be set up.
8.2. PRESENT GUIDELINE: DIRECTIVE 2003/10/EG 129The work place must be indicated with appropriate signalization.Individual hearing protection must be used.Although this legislation is more strict than the older national regulation,the admissible exposure levels are still much higher than the lower limitwhere, at long exposure hearing impairment will occur (this threshold is 80dB). Because of this a new European regulation was introduced with loweraction values : guideline 2003/10/EG.8.2 Present guideline: directive 2003/10/EGThe European guideline 2003/10/EGConcerning the minimum prescriptionson health and safety with regard to the exposure of employees to risks ofphysical agents (noise) was converted into a national legislation on the 16 thof January 2006 (BS 15.02.2006).The law is applicable to employers and employees and includes all activitieswhere employees can be exposed to risks related to noise on theirwork.Two exposure levels that are used as action- and limit values are definedin the legislation :(Daily exposure to noise) (L EX,8h ) (dB(A) re. 20 µPa) : this is thetime weighted average of the levels of exposure to noise on a normalwork day of 8 hours.L EX,8h = L Aeq,Te +10log T eT 0(8.1)whereL Aeq,Te = 10logand T 0 = 28800 seconds.(1T e∫ Te0(pA (t)p 0) 2)(8.2)Weekly exposure to noise (L EX,8h ) : the time weighted average of thedaily levels of exposure to noise in an normal week of five working daysof 8 hours. ( )L w EX,8h = 10log 1m∑10 0.1(L EX,8h) k(8.3)5k=1Three important values are fixed in the legislation :
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VRIJE UNIVERSITEITBRUSSELAcousticsB
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iiWhen sound becomes noise, it will
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ContentsI Introduction to acoustics
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CONTENTSvii4.3 Measuring the acoust
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Part IIntroduction to acoustics1
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4 CHAPTER 1. FUNDAMENTAL CONCEPTS O
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10 CHAPTER 1. FUNDAMENTAL CONCEPTS
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36 CHAPTER 3. MEASURING SOUNDFigure
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44 CHAPTER 3. MEASURING SOUNDfactor
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56 CHAPTER 3. MEASURING SOUND
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Chapter 4Sound AbsorptionAll(constr
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4.1. ACOUSTIC TRANSMISSION BETWEEN
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4.1. ACOUSTIC TRANSMISSION BETWEEN
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Page 162: 152 BIBLIOGRAPHY[12] Bruel and Kjae
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