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

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.