3.6. Mechanoacoustic transducer

This type of transducer occurs at a junction point between the mechanical and acoustical parts of an analogous circuit. An example is the plane at which a loudspeaker diaphragm acts against the air. This transducer may also be characterized by four terminals. At two of the terminals, forces and velocities can be measured. At the other two, pressures and volume velocities can be measured. The basic equations applicable to the mechanoacoustic transducer are
f˜=Sp˜,
image (3.43a)
U˜=Su˜,
image (3.43b)
where
  • f˜ image is force in N,
  • p˜ image is pressure in Pa,
  • U˜ image is volume velocity in m3/s,
  • u˜ image is velocity in m/s,
  • S is area in m2.
The analogous symbols for this type of transducer are given at the bottom of Table 3.3 (page 70). They are seen to lead directly to Eq. (3.43).
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