o° 
6 
4sin®@ cos®@ 
Figure 2 — Directional Pattern of Intensity 
and All Components of Mean-Square 
Sound Pressure in Plane of the 
Two Axes of a Lateral 
90° 
Quadrupole 
180° 
= 1 iL Aico oe? 4 2 ear 
p= ae oi cos 6T,, ours (3 cos" 6 - 4cos*6+1) T;, T3, 
oc See 
+—(9c0s* 6 - 6 cos? 6 +1) T3373, | ¢y ay" [33] 
A 
Similarly, from Equation [26], the sound intensity for this case is 
1 1 A Seon Ge bs rer men get aia 
[= Sara he cos*@ 733 Ty, + (1 - 800s? 6) T3, 753 | 47 a 
16 7° p oe r r 
1 1 c2 : oo lee Le SBA 
Fearneln (oe Tilt) ee o 
0 
and 
Ig = 9 
For a narrow band of frequencies around the angular frequency » in the spectrum of 
T,3 or the sound radiated by this longitudinal quadrupole, these equations may be written: 
11 
