A rectangular plate fixed at its edges.
A 'rect-plate can be created using the following Lisp syntax (the default values are shown for each of the physical parameters):
The arguments for the physical parameters can be either numerical values or Modalys controllers (either dynamic or constant). If a given parameter is not supplied when using the Lisp syntax, the default parameter value will be used.
Note that, unlike other objects, the values for freq-loss and const-loss default to 10 for this object.
A rectangular plate can be accessed in its z-direction ('normal) from any point on its surface.
(make-access my-plate my-2D-controller 'normal)
This makes an up-and-down access (in the z direction) at a point on the surface of my-plate. The point is defined by my-2D-controller where the first dimension is x and the second is y (the plate's corners being the points (0, 0), (0, 1), (1, 0) and (1, 1)). For example, in order to access the center of the plate we can say:
(make-access my-plate (const 0.5 0.5) 'normal)
A rect-plate can be tuned to a specific pitch, using the (set-pitch ...) function, by adjusting one of the following physical parameters:
Note that for 'size, both the x and y dimensions are scaled together proportionally in order to preserve the harmonic relationships the plate's mode frequencies.
(setq my-plate (make-object 'rect-plate))
(set-pitch my-plate 'size (const 440))