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Radiator Object


The radiator object simulates the impedance loss resulting from the emission of a sound wave out of a pulsating spherical cap.

Syntax and Default Values

A 'radiator object can be created using the following Lisp syntax:

(make-object 'radiator
             (radius .01)
             (angle 0)
             (rho 1.2)
             (celerity 340))


The parameters for this object are a little different from regular objects:

  • radius: in meters.
  • angle: aperture angle in degrees.
  • rho: medium density of sound radiation in the propagating medium (kg/m3).
  • celerity: swiftness/speed of the sound in the propagating medium (m/s).

For this object, you can control the radius of the sphere, the aperture angle, the medium density and the celerity of sound in that propagating medium. To simulate propagation in air (room temperature at sea level), you should use an air density value of 1.2 kg/m3 for rho, and the speed of sound in air, 340 m/s, for celerity.


A radiator can be accessed only in the 'normal direction:

(make-access my-radiator (const 1) 'normal)
As with the single-point object, the access location controller should be set to a constant value such as 1, since this object has no spatial properties.

The 'radiator object is designed to be adhered to an access which will be used as a point-output, and the radiator's access used instead of the access on the vibrating object. Here is a basic example:

(setq my-resonator (make-object 'mono-string))
(setq resonator-out (make-access my-resonator (const .695) 'trans0))
(setq my-radiator (make-object 'radiator (angle 90) (radius 3e-2)))
(setq radiator-acc (make-access my-radiator (const 1) 'normal))
(make-connection 'adhere resonator-out radiator-acc)
(make-point-output radiator-acc)

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