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Table 6.

Estimates of the effects of air or heliox loads on sound sources of different sizes (see Equation 3)

Sound sourceCase 1 Half width of harpCase 2 HarpCase 3 Fore-wing
Effective source radius (mm) 1.1 2.2 4.0 
Volume of equivalent sphere (m35.6×10-9 44.6×10-9 270×10-9 
Mass of sphere of air (μg) 6.7 54 320 
Mass of sphere of heliox (μg) 2.7 22 130 
Effect of heliox versus air on resonant frequency(fo; Equation 3)    
If the resonator is harp 1.01 1.06 1.24 
If resonator is harp + file + anal area 1.002 1.01 1.07 
Sound sourceCase 1 Half width of harpCase 2 HarpCase 3 Fore-wing
Effective source radius (mm) 1.1 2.2 4.0 
Volume of equivalent sphere (m35.6×10-9 44.6×10-9 270×10-9 
Mass of sphere of air (μg) 6.7 54 320 
Mass of sphere of heliox (μg) 2.7 22 130 
Effect of heliox versus air on resonant frequency(fo; Equation 3)    
If the resonator is harp 1.01 1.06 1.24 
If resonator is harp + file + anal area 1.002 1.01 1.07 

The following densities are used for the gases: air, 1.2 kg m-3;heliox, 480 g m-3.

The mass of the harp is taken as 0.22 mg; the mass of the harp plus file plus anal area is taken as 1.2 mg (mean of left and right wing from Table 2).

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