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

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116 CHAPTER 6. NOISE CONTROLThe design rules are in this case :1. Put the openings in the right place and point them in the right direction.2. Use a damper or screen at the opening.Structure-borne noise radiation depends on the size, shape, flexibility,mass and damping. Regarding radiation, it is desirable to design the areaswhich are loaded, as compact as possible. Design rules for structure-bornenoise radiation :1. Reduce the radiation surface (see Figure 6.19).2. Use lids with low radiation efficiency :Thin plates instead of thick plates.Perforated plates (see e.g. Figure 6.20).Panels with damping material (bitumen, constrained layer dampingmaterial), see Figure 6.21.Figure 6.19: Reducing the radiation surface.
6.4. RADIATION NOISE 117Figure 6.20: Casing of a belt drive with a perforated panel.Figure 6.21: Damping of panels.
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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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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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