Circular Plate - Free

A 'free-circ-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.

• modes: number of modes.
• radius: in meters.
• thickness: in meters.
• density: in kg/m^3. See chart of material properties for appropriate values.
• young: Young's modulus, in N/m^2. See chart of material properties for appropriate values.
• poisson: poisson ratio. See chart of material properties for appropriate values.
• freq-loss, const-loss: loss coefficients. See General object information.

A 'free-circ-plate can be accessed in one dimension - perpendicular to the plate (i.e. 'normal):

The first dimension of my-2D-controller is a number between zero and one which describes the distance from the center of the plate to the edge (zero is at the center and 1 is at the edge). The second dimension describes the angle (in degrees) of the radius in question. If there is only one access, then, this dimension is of no importance and can be left at zero. If the plate has several accesses, the angle is used to describe the relationship between them.

A 'free-circ-plate can be tuned to a specific pitch, using the (set-pitch ...) function, by adjusting one of the following physical parameters:

• 'radius
• 'thickness
• 'density
• 'young

For example: