Abstract: A multi-electrode piezoelectric diaphragm structure includes a diaphragm, piezoelectric material located on the diaphragm, which is defined as having a first area, and a second area. The first area of the piezoelectric is poled in a first direction, and the second area of the piezoelectric is poled in a second direction. The poled first direction is in a Z-axis of the piezoelectric and the poled second direction is in a Radial axis of the piezoelectric. A first electrode is positioned in the first area, on the first surface, of the piezoelectric. A second electrode is positioned in the second area, on the first surface, of the piezoelectric. A third electrode is located on a second surface of the piezoelectric.

Abstract: Two essentially identical oval shaped blades each attached rotatably by axles within a cylindrically shaped main chamber of a housing. Each blade has a cross-sectional profile approximating opposing larger radius 90 degree arcs connected by opposing smaller radius 90 degree arcs. Each blade is attached to a rotatable carriage assembly within the housing, and 180 degrees apart in the same orbital path about the rotational axis of the carriage assembly. The rotational axis of the carriage assembly, and the orbital path of the blades about the carriage assembly axis are eccentric relative to the center of the main chamber. A transmission and timing arrangement communicates and coordinates rotational movement between the carriage assembly and blades. The blades are positioned with the length of one blade perpendicular to the other blade length while rotating and orbiting about the axis of the rotating carriage assembly.